Tektronix Keithley 2281 Series Reference Manual
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Tektronix Keithley 2281 Series Reference Manual

Precision dc power supply and battery simulator
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Model 2281S-20-6 Precision DC
Power Supply and Battery Simulator
Reference Manual
077114601 / March 2019
*P077114601*
077114601

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  • Page 1 tek.com/keithley Model 2281S-20-6 Precision DC Power Supply and Battery Simulator Reference Manual 077114601 / March 2019 *P077114601* 077114601...
  • Page 2 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual...
  • Page 3 © 2019, Keithley Instruments, LLC Cleveland, Ohio, U.S.A. All rights reserved. Any unauthorized reproduction, photocopy, or use of the information herein, in whole or in part, without the prior written approval of Keithley Instruments, LLC, is strictly prohibited. These are the original instructions in English. All Keithley Instruments product names are trademarks or registered trademarks of Keithley Instruments, LLC.
  • Page 4 Safety precautions The following safety precautions should be observed before using this product and any associated instrumentation. Although some instruments and accessories would normally be used with nonhazardous voltages, there are situations where hazardous conditions may be present. This product is intended for use by personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury.
  • Page 5 For safety, instruments and accessories must be used in accordance with the operating instructions. If the instruments or accessories are used in a manner not specified in the operating instructions, the protection provided by the equipment may be impaired. Do not exceed the maximum signal levels of the instruments and accessories. Maximum signal levels are defined in the specifications and operating information and shown on the instrument panels, test fixture panels, and switching cards.

  • Page 6: Table Of Contents

    Table of contents Introduction ......................1-1 Welcome ..........................1-1 Extended warranty ....................... 1-1 Contact information ......................1-2 Product documentation and drivers ..................1-2 Organization of manual sections ..................1-3 Key features ......................... 1-4 Standard accessories ......................1-5 Optional accessories ......................1-6 Available services ........................
  • Page 7 Table of contents Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Power supply ........................... 2-96 Battery test ..........................2-97 Battery simulator ........................2-97 Select a specific measurement range ................2-97 Selecting a specific measurement range ................2-98 Using autoranging for current measurements ................. 2-99 Protection .........................
  • Page 8 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Table of contents Idle and initiate ........................3-31 Arm layer ..........................3-31 Trigger layer ..........................3-31 Source, source delay, and measure actions ................3-32 Counter ........................... 3-32 Meter complete ........................3-32 Running the trigger model .......................
  • Page 9 Table of contents Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Application examples ....................5-1 Simple voltage output and current measurement ..............5-1 Equipment required ........................5-1 Set up remote communications ....................5-1 Device connections ........................5-2 Set the voltage and current limit ....................5-2 Configure and execute a 10-step linear list sweep ..............
  • Page 10 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Table of contents :CONFigure[n]:<function> ....................... 7-13 :ENTRy[n]:FUNCtion ....................... 7-14 :FETCh[n]? ..........................7-15 :FORCe:TRIGger ........................7-16 :FORMat:ELEMents ........................ 7-17 :MEASure[n]:<function>? ......................7-18 :READ[n]? ..........................7-20 ARM subsystem ......................... 7-21 :ARM[:SEQuence[n]]:COUNt ....................7-21 :ARM[:SEQuence[n]]:SOURce ....................
  • Page 11 Table of contents Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:TEST[:SOURce]:VOLTage[:LEVel] ..............7-63 :BATTery[n]:TEST[:SOURce]:VOLTage:LIMit ................. 7-64 :BATTery[n]:TEST[:SOURce]:VOLTage:PROTection[:LEVel]..........7-65 :BATTery[n]:TRACe:TRIGger:CURRent:DIRection ..............7-66 :BATTery[n]:TRACe:TRIGger:CURRent[:LEVel] ..............7-66 :BATTery[n]:TRACe:TRIGger:CURRent:STATe ..............7-67 :BATTery[n]:TRACe:CLEar ..................... 7-67 :BATTery[n]:TRACe:DATA? ....................7-68 :BATTery[n]:TRACe:DATA:SELected? ................... 7-70 :BATTery[n]:TRACe:SAVE ...................... 7-71 :BATTery[n]:TRACe:TRIGger:OCCur? ...................
  • Page 12 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Table of contents :OUTPut:DELay:FALLing ...................... 7-108 :OUTPut:DELay:RISing ......................7-109 :OUTPut:DELay:STATe ......................7-110 :OUTPut:PROTection:CLEar....................7-111 :OUTPut:PROTection:TRIPped?[<channel>] ................ 7-112 :OUTPut[:STATe] ........................7-113 SENSe subsystem ......................7-114 :SENSe[n]:FUNCtion ......................7-114 :SENSe[n]:<function>:AVERage:COUNt ................7-115 :SENSe[n]:<function>:AVERage[:STATe] ................
  • Page 13 Table of contents Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :STATus:QUEStionable:INSTrument:ISUMmary[:EVENt]? ........... 7-160 :STATus:QUEStionable:INSTrument:ISUMmary:ENABle ............. 7-160 :STATus:QUEStionable:INSTrument:ISUMmary:CONDition? ..........7-161 SYSTem subsystem ......................7-162 :SYSTem:AZERo[n][:STATe] ....................7-162 :SYSTem:BEEPer:ERRor[:STATe] ..................7-163 :SYSTem:COMMunication:ABORt ..................7-163 :SYSTem:COMMunication:LAN:CONFigure ................. 7-164 :SYSTem:COMMunication:LAN:MACaddress? ..............7-165 :SYSTem:DATE ........................
  • Page 14 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Table of contents :TRIGger[:SEQuence[n]]:SOURce ..................7-200 Troubleshooting guide .................... 8-1 Introduction .......................... 8-1 Contacting support ....................... 8-1 What to do if the power supply does not turn on ..............8-2 LAN troubleshooting suggestions ..................
  • Page 15 Table of contents Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Check DC voltage setting accuracy without remote sense ............. B-19 Check DC voltage readback accuracy without remote sense ..........B-21 Check DC voltage line regulation .................... B-23 Check DC voltage load regulation ...................
  • Page 16 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Table of contents Programming and reading registers ..................D-5 Programming enable registers ....................D-5 Reading the registers ........................ D-6 Clearing the registers ......................D-6 Status byte and service request ................... D-7 Status Byte Register .........................

  • Page 17: Introduction

    Section 1 Introduction In this section: Welcome .................. 1-1 Extended warranty ..............1-1 Contact information ..............1-2 Product documentation and drivers .......... 1-2 Organization of manual sections ..........1-3 Key features ................1-4 Standard accessories ............... 1-5 Optional accessories ..............1-6 Available services ..............

  • Page 18: Contact Information

    Section 1: Introduction Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Contact information If you have any questions after you review the information in this documentation, please contact your local Keithley Instruments office, sales partner, or distributor. You can also call the corporate headquarters of Keithley Instruments (toll-free inside the U.S.

  • Page 19: Organization Of Manual Sections

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 1: Introduction Organization of manual sections The information in this manual is organized into the following major categories: General operation: Describes the components of the instrument and basic operation. Functions and features: Describes features and functions, such as measure operations, battery test, battery simulation, list mode, reading buffers, triggering, the digital I/O port, graph function, output delay, and slew rate.

  • Page 20: Key Features

    Section 1: Introduction Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Key features The 2281S has three basic functions: High-performance power supply, battery test, and battery simulation. As a high-performance power supply:  High-current resolution and sensitivity to measure a wide range of load currents ...

  • Page 21: Standard Accessories

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 1: Introduction Standard accessories Accessory Part number Model 2281-001 output mating connector 2281-001 Standard LAN crossover cable Quick start guide See the following table for part numbers. Certification of calibration You will get one of the following quick start guides.

  • Page 22: Optional Accessories

    Section 1: Introduction Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Optional accessories Optional accessory Part number Model 2281-001 output mating connector 2281-001 USB cable type A to B, 1 m (3.3 ft) USB-B-1 Standard LAN crossover cable IEEE-488.2 interface board for the PCI bus KPCI-488LPA Double-shielded premium IEEE-488 interface cables, 0.5 m (1.6 ft)

  • Page 23: General Ratings

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 1: Introduction General ratings The general ratings and connections for the 2281S are listed in the following table. Category Specification Supply voltage range 100 V, 120 V, 220 V, 240 V; each range capable of 10% tolerance, 50 Hz or 60 Hz Selectable by the line-voltage selector switch on the rear panel Output connections...

  • Page 24: General Operation

    Section 2 General operation In this section: Front-panel overview ..............2-1 Rear-panel overview ..............2-3 Front-panel user interface ............2-4 Installing the system ............... 2-52 Test connections ..............2-61 Remote communications interfaces ........2-68 Set voltage and current limit ........... 2-93 Select a measurement function ..........

  • Page 25: Front-Panel Overview

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Opens the main menu. Select the icons using the navigation MENU key control and pressing the ENTER key to open battery, source, measure, views, trigger, and system screens. For details, see Power supply menu overview (on page 2-19), Battery test menu...

  • Page 26: Rear-Panel Overview

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Rear-panel overview The rear panel of the 2281S is shown below; descriptions follow the figure. Figure 2: 2281S rear panel Supports full connectivity on a 10 Mbps or 100 Mbps network. The LAN port 2281S is a version 1.4 LXI Core 2011 compliant instrument that supports TCP/IP and complies with IEEE Std 802.3 (ethernet...

  • Page 27: Front-Panel User Interface

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Front-panel user interface The front-panel user interface gives you quick access to the functions of this instrument. It includes the startup screen to choose a function, home screens for each of the functions, and menus for the functions.
  • Page 28 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Communication settings status indicator Move the focus to the communication indicator using the navigation control and press the ENTER key to see a list of present communications settings. Figure 4: 2281S communication status indicator Indicator Meaning...
  • Page 29 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Level trigger enabled indicator When a voltage level trigger or current level trigger is enabled, a solid white square indicator is visible to the left of the Buffer indicator. Figure 6: Level trigger enabled indicator When a level trigger is enabled, data is logged to the buffer when the triggering condition is met.
  • Page 30 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation List and recall settings indicator This indicator shows the specified list number or recall settings. Figure 8: List and recall settings indicator Error and event indicator Move the focus to the error and event indicator using navigation control and press the ENTER key to see the present error and event messages.
  • Page 31 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual This indicator has a different appearance based on the type of event that has been logged. Icon Description A serious error has occurred. These major errors are: ...
  • Page 32 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Home screen for the power supply function The following default screen is displayed when you choose the power supply function. Descriptions of the numbered screen areas are in the table following the figure. Figure 10: Power supply home screen # Screen element Description...
  • Page 33 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Soft key area 1 for the power supply function Soft-key area 1 for the power supply function contains the settings shown in the following figure and explained in the table.
  • Page 34 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Soft key area 2 for the power supply function Soft key area 2 for the power supply function contains the settings shown in the following figure and explained in the table.
  • Page 35 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Soft key area 3 for the power supply function Soft key area 3 for the power supply function contains the settings shown in the following figure and explained in the table.
  • Page 36 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Home screen for the battery test function The following default screen is displayed when you choose the battery test function. Descriptions of the numbered screen areas are in the table following the figure. For more information about using the battery test function, see Battery test (on page 3-55).
  • Page 37 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Soft-key areas for the battery test function The 2281S display has multiple soft-key areas that you can access by pressing the Next soft key. The soft-key areas give you front-panel access to some instrument settings so that you can change, enable, or disable them quickly.
  • Page 38 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Soft key area 2 for the battery test function Soft key area 2 contains the settings shown in the following figure and explained in the table. To change a setting, press the soft key to open a setting window.
  • Page 39 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Home screen for the battery simulator function The following default screen is displayed when you choose the battery simulation function. Descriptions of the numbered screen areas are in the table following the figure. For details about how to use the battery simulator function, see Battery simulation (on page 3-69).
  • Page 40 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Soft-key areas for the battery simulator function The 2281S display has multiple soft-key areas that you can access by pressing the Next soft key. The soft-key areas give you front-panel access to some instrument settings so that you can change, enable, or disable them quickly.
  • Page 41 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Soft key area 2 for the battery simulator function Soft key area 2 contains the settings shown in the following figure and explained in the table. Figure 20: Soft key area 2 for battery simulation Setting Description...

  • Page 42: Power Supply Menu Overview

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Power supply menu overview To access the main menu of the power supply, press the MENU key on the 2281S front panel when you are in the power supply home screen. The organization of the main menu is shown in the figure below.
  • Page 43 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Source Settings menu for the power supply function You can change the following settings by pressing the MENU key, moving focus to the Source Settings icon, and pressing the Enter key. Setting Description Configure the voltage setting using the numerical keys, soft keys, and...
  • Page 44 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Source List menu for the power supply function This menu allows you to set up a source configuration list. Setting Description Select a list from nonvolatile memory; import a list from an external USB flash List drive;...
  • Page 45 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Measure menu for the power supply function The menus organized under Measure in the main menu allow you to select, configure, and perform measure operations from the 2281S front panel. The following topics describe the settings that are available on these interactive screens.
  • Page 46 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Measure Rel/Filter menu for the power supply function This menu contains settings that specify the way measurement information is returned. Setting Description Displays the presently selected function. Function Use the relative offset feature to subtract a set value or a baseline reading Rel State...
  • Page 47 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Measure Data Buffers menu for the power supply function From this screen you can save, resize, and clear buffers. You also can set buffer fill mode and statistics functions.
  • Page 48 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Views menu for the power supply function The menus organized under View in the main menu allow you to view the data plot, sheet, and statistics results on the 2281S front panel. The following topics describe the settings that are available on these interactive screens.
  • Page 49 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Trigger menu for the power supply function This menus organized under Trigger in the main menu allow you to configure triggering operations from the 2281S front panel. The following topics describe the settings that are available on these interactive screens.
  • Page 50 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Trigger Digital In/Out menu for the Power Supply Function This menu allows you to configure the mode for each digital I/O line. The 2281S has 6 digital I/O lines (line 1 to line 6).
  • Page 51 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Trigger Level menu for the power supply function This menu allows you to configure a triggering condition to start to log the data in the data buffer during the test.
  • Page 52 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation You can use the following SCPI commands to configure the level trigger: :TRACe[n]:TRIGger:VOLTage:STATe :TRACe[n]:TRIGger:VOLTage[:LEVel] :TRACe[n]:TRIGger:VOLTage:DIRection :TRACe[n]:TRIGger:CURRent:STATe :TRACe[n]:TRIGger:CURRent[:LEVel] :TRACe[n]:TRIGger:CURRent:DIRection :TRACe[n]:TRIGger:OFFSet In addition, you can query whether any level trigger has been activated using the following SCPI command: :TRACe[n]:TRIGger:OCCUR? System menu for the power supply function...
  • Page 53 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual System Settings menu for the power supply function This menu contains general instrument settings. Communication settings for the power supply function This menu allows you to configure GPIB, LAN, and USB communications settings. To access the System Communication settings screen: 1.
  • Page 54 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation The 2281S powers up using the last remote interface used. Other system settings for the power supply function Setting Description Turn the instrument key-click sound on or off from this menu. Key Click You can set the front-panel display to dim after a period of time, or Backlight Timer...

  • Page 55: Battery Test Menu Overview

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual System Information menu for the power supply function The System Information menu shows the serial number, firmware version, and the calibration adjust date and count. It also allows you to upgrade the firmware and calibrate the instrument. When you select Demo mode, you can choose List Mode or Pulse.
  • Page 56 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Source menu for the battery test function The menus organized under Source in the main menu allow you to configure the settings for the battery test from the 2281S front panel. The following topics describe the settings that are available on these interactive screens.
  • Page 57 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Measure menu for the battery test function The menus organized under Measure in the main menu for battery test allow you to select, configure, and perform measure operations from the 2281S front panel. The following topics describe the settings of measure menu that are available on these interactive screens.
  • Page 58 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Measure Data Buffers menu for the battery test function This menu allows you to configure settings for the measurement data buffer. Setting Description Displays how many points can be saved in the buffer. For the 2281S, it is Size 2500 points.
  • Page 59 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Views Sheet menu for the battery test function You can access this menu by pressing the MENU key, moving focus to the Sheet icon, and pressing the Enter key.
  • Page 60 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Trigger Digital In/Out menu for the battery test function This menu allows you to configure the mode for each digital I/O line. The 2281S has six digital I/O lines (line 1 to line 6).
  • Page 61 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Trigger Level menu for the battery test function This menu allows you to configure a triggering condition to start to log the data in the data buffer during the test.
  • Page 62 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation You can use the following SCPI commands to configure the level trigger: :TRACe[n]:TRIGger:VOLTage:STATe :TRACe[n]:TRIGger:VOLTage[:LEVel] :TRACe[n]:TRIGger:VOLTage:DIRection :TRACe[n]:TRIGger:CURRent:STATe :TRACe[n]:TRIGger:CURRent[:LEVel] :TRACe[n]:TRIGger:CURRent:DIRection :TRACe[n]:TRIGger:OFFSet In addition, you can query whether any level trigger has been activated using the following SCPI command: :TRACe[n]:TRIGger:OCCUR? Trigger Limit menu for the battery test function...
  • Page 63 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual System Settings menu for the battery test function This menu contains general instrument settings. System Communication settings for the battery test function This menu allows you to configure GPIB, LAN, and USB communications settings. To access the System Communication settings screen: 1.
  • Page 64 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Other system submenus for the battery test function Setting Description Turn the instrument key-click sound on or off from this menu. Key Click You can set the front-panel display to dim after a period of time, or Backlight Timer you can set it so that it will never dim.

  • Page 65: Battery Simulator Menu Overview

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual System Information menu for the battery test function The System Information menu shows the serial number, firmware version, and the calibration adjust date and count. It also allows you to upgrade the firmware and calibrate the instrument. When you select Demo mode, you can choose List Mode or Pulse.
  • Page 66 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Battery menu for the battery simulator function The menus organized under Battery in the main menu allow you to configure the settings for the battery simulation from the 2281S front panel. The following topics describe the settings that are available on these interactive screens.
  • Page 67 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Measure Settings menu for the battery simulator function This menu contains settings for the measurement. You can only set the sampling interval. The line frequency is also shown here. Setting Description Configure the measurement time.
  • Page 68 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation You can also access this page by selecting Graph in soft key area 3 of the battery simulator home screen. Views Data Sheet menu for the battery simulator function You can access this menu by pressing the MENU key, moving focus to the Sheet icon, and pressing the Enter key.
  • Page 69 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Trigger Digital In/Out menu for the battery simulator function This menu allows you to configure the mode for each digital I/O line. The 2281S has six digital I/O lines (line 1 to line 6).
  • Page 70 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Trigger Level menu for the battery simulator function This menu allows you to configure a triggering condition to start to log the data in the data buffer during the test.
  • Page 71 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual You can use the following SCPI commands to configure the level trigger: :TRACe[n]:TRIGger:VOLTage:STATe :TRACe[n]:TRIGger:VOLTage[:LEVel] :TRACe[n]:TRIGger:VOLTage:DIRection :TRACe[n]:TRIGger:CURRent:STATe :TRACe[n]:TRIGger:CURRent[:LEVel] :TRACe[n]:TRIGger:CURRent:DIRection :TRACe[n]:TRIGger:OFFSet In addition, you can query whether any level trigger has been activated using the following SCPI command: :TRACe[n]:TRIGger:OCCUR? Trigger Limit menu for the battery simulator function...
  • Page 72 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation System Settings menu for the battery simulator function This menu contains general instrument settings. System Communication settings for the battery simulator function This menu allows you to configure GPIB, LAN, and USB communications settings. To access the System Communication settings screen: 1.
  • Page 73 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Other system settings for the battery simulator function Setting Description Turn the instrument key-click sound on or off from this menu. Key Click You can set the front-panel display to dim after a period of time, or Backlight Timer you can set it so that it will never dim.

  • Page 74: Adjusting The Backlight Brightness And Timer

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation System Information menu for the battery simulator function The System Information menu shows the serial number, firmware version, and the calibration adjust date and count. It also allows you to upgrade the firmware and calibrate the instrument. When you select Demo mode, you can choose List Mode or Pulse.

  • Page 75: Installing The System

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual To adjust the brightness using the SCPI remote interface: Send the following command: :DISPlay:BRIGhtness <brightness> Where <brightness> is from 1 to 100. For example, 75 represents 75 percent brightness and 100 represents full brightness.

  • Page 76: Dimensions

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Remove all connections to the rear panel of the 2281S before removing the rear bumper. 2. To remove the rear bumper, repeat the procedure in step 1. Dimensions The following figures show the mounting screw locations and the dimensions of the instrument with and without the bumpers.
  • Page 77 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual The following figures show the dimensions when the bumpers are installed. Figure 30: 2281S front and rear panel dimensions with bumpers 2-54 077114601 / March 2019...
  • Page 78 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Figure 31: 2281S top and side dimensions with bumpers 077114601 / March 2019 2-55...
  • Page 79 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual The following figures show the dimensions when the bumpers have been removed. Figure 32: 2281S front and rear panel dimensions with bumpers removed 2-56 077114601 / March 2019...
  • Page 80 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Figure 33: 2281S top and side dimensions with bumpers removed 077114601 / March 2019 2-57...

  • Page 81: Power The Instrument On And Off

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Power the instrument on and off Follow the procedure below to connect the 2281S to line power and turn on the instrument. The 2281S operates on the following ranges: 100 V, 120 V, 220 V, or 240 V at a frequency of 50 Hz or 60 Hz.
  • Page 82 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation To connect the power cord: 1. Make sure that the front panel POWER switch is in the off (O) position. 2. Properly set the 100 V/120 V or 220 V/240 V selector switch located on the rear panel. 3.
  • Page 83 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual To turn the output on using a SCPI command: :OUTPut:STATe ON When you are using a remote interface to control the instrument and the output is turned off, pressing the OUTPUT switch cannot turn the output on.

  • Page 84: Test Connections

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Disable the 2281S output You can disable the 2281S output from the front panel and by sending remote commands. If disabled, pressing the OUTPUT switch on the front panel does not turn on the output. Using the front panel: 1.

  • Page 85: Front-Panel Connector

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Front-panel connector Front-panel connectors are available to connect load wires for bench operation. A chassis ground binding post is also provided on the front panel. Figure 35: Front-panel binding post There are two locations on the binding post to connect the wire.

  • Page 86: Rear-Panel Output Mating Connector

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Rear-panel output mating connector Available connections on the rear output mating connector include the output high (+), output low (-), sense high (+), and sense low (-) terminals. The rear output terminals accept wire sizes from AWG 20 to AWG 12.

  • Page 87: Four-Wire Sense Connection

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Four-wire sense connection Using four-wire remote sensing connections ensures that the programmed voltage is applied to the load and compensates for the voltage drop in the leads between the power supply and the load. The maximum voltage drop is 1 V per lead.
  • Page 88 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation To reduce the environmental noise, load wires and sense wires must be twisted. For more information, refer to the following figure. Figure 39: Four-wire connection with twisted-pair wires Make sure you make the connections correctly.

  • Page 89: Open Leads Detection

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Open leads detection When using four-wire sense connections, a missing or faulty connection with Sense HI, Sense LO, Output HI, or Output LO results in improperly regulated voltage and inaccurate voltage measurements. The voltage readback shown on the front panel is not equal to the real output voltage.

  • Page 90: Reversed Sense Leads

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation 5. Power on the instrument and repeat steps 1 through 3. The following figure shows the error that is displayed on the front panel. Figure 41: Open lead error You can retrieve the error number and message through a remote interface by sending the :SYSTem:ERRor? command.

  • Page 91: Remote Communications Interfaces

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Figure 42: Reversed sense leads error To clear the error, you need to clear the Questionable Instrument Summary Event Register bit and initiate the trigger model using the front panel or SCPI commands. For more information on registers, refer to Questionable Instrument Summary Event Register (on page D-16).

  • Page 92: Supported Remote Interfaces

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Supported remote interfaces The 2281S supports the following remote interfaces: GPIB: IEEE-488 instrumentation general purpose interface bus USB: Type B USB connection Ethernet: Local area network ethernet communications GPIB communications This topic contains information about GPIB standards, bus connections, and primary address selection.
  • Page 93 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Connect GPIB cables to your instrument To connect an instrument to the GPIB interface, use a cable equipped with standard GPIB connectors, as shown below. Figure 43: GPIB connector To allow many parallel connections to one instrument, stack the connectors.
  • Page 94 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Figure 44: IEEE-488 connection to 2281S To connect the instrument to GPIB: 1. Align the cable connector with the connector on the 2281S rear panel. The location of the connector is shown in the following figure.

  • Page 95: Lan Communications

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Set the GPIB address The default GPIB address is 5. You can set the address to any number from 1 to 30 if it is unique in the system.
  • Page 96 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Figure 46: 2281S LAN connection You can connect the instrument to the LAN in a one-to-one, one-to-many, two-network card, or enterprise configuration, as described in the following topics. One-to-one connection With most instruments, a one-to-one connection is done only when you are connecting a single instrument to a single network interface card.
  • Page 97 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual One-to-many connection With a LAN hub, a single network interface card can be connected to as many instruments as the hub can support. This requires straight-through network (not crossover) cables for hub connections. The advantage of this method is easy expansion of measurement channels when the test requirements exceed the capacity of a single instrument.
  • Page 98 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Instrumentation connection to enterprise routers or servers This connection uses an existing network infrastructure to connect instruments to the computer controller. In this case, you must get the network resources from the network administrator. Usually, the instruments are kept inside the corporate firewall, but the network administrator can assign resources that allow them to be outside the firewall.
  • Page 99 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Set up LAN communications on the instrument This section describes how to set up manual or automatic LAN communications on the instrument. Check communication settings Before setting up the LAN configuration, you can check the communication settings on the instrument without making any changes.
  • Page 100 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation If you are using a 2281S with no front panel, you can configure the LAN using SCPI commands. For details, see the SCPI command :SYSTem:COMMunication:LAN:CONFigure (on page 7-164). Set up manual LAN configuration If necessary, you can set the IP address on the instrument manually.
  • Page 101 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Set up LAN communications on the computer This section describes how to set up the LAN communications on your computer. Do not change your IP address without consulting your system administrator. Entering an incorrect IP address can prevent your computer from connecting to your corporate network.
  • Page 102 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Web interface When the LAN and instrument establish a connection, you can open a web page for the instrument. To access the web interface: 1. Open a web browser on the host computer. 2.
  • Page 103 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Identify the instrument If you have a bank of instruments, you can select the ID button to determine which one you are communicating with. Before trying to identify the instrument, make sure you have a remote connection to the instrument. To identify the instrument: 1.
  • Page 104 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Figure 53: Modify IP configuration 4. Change the values. 5. Select Submit. The instrument reconfigures its settings, which may take a few seconds. You may lose your connection with the web interface after selecting Submit. This is normal and does not indicate an error or failure of the operation.
  • Page 105 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Take a snapshot and fetch data in the virtual front panel You can take a snapshot of the 2281S LCD display and fetch buffered test data on the web page. To take a snapshot: 1.
  • Page 106 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Figure 55: 2281S Virtual Front Panel 4. Select Fetch Data. A dialog box indicating Copying completed: 100% is displayed. 5. Select OK. 6. Paste the data into your report. Control the instrument through the virtual front-panel web page You can operate the instrument using the virtual front panel shown in the figure below.
  • Page 107 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual The 2281S only allows three or fewer clients to open the virtual front panel web page at the same time. Only the first successfully connected client can operate the instrument. Other clients can only view the virtual front panel.
  • Page 108 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation If you enter batch commands in the command box and select Auto, you will run the batch commands automatically, one-by-one. Select Stop to stop the automatic run of the batch commands.
  • Page 109 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual There are three ways to log data on the web page:  There is a STOP MODE box in the upper right corner of the screen. ...
  • Page 110 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Some of the fields in this pane are explained in the following table. Math, Relative, OXP, and Overflow settings visible in the table are saved in the instrument setup. You can save and recall special setups before using the data logging function;...

  • Page 111: Usb Communications

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual USB communications To use the rear-panel USB port, you must have the Virtual Instrument Software Architecture (VISA) layer on the host computer. See How to install the Keithley I/O Layer (on page 2-92) for more information.
  • Page 112 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Communicate with the instrument For the instrument to communicate with the USB device, you must use NI-VISA . VISA requires a resource string in the following format to connect to the correct USB instrument: USB0::0x05E6::0x2281S::[serial number]::INSTR Where: 0x05e6 = The Keithley Instruments vendor ID...
  • Page 113 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual 3. Select Next. The Select Communication Bus dialog box is displayed. Figure 61: Select Communication Bus dialog box 4. Select USB. 5. Select Next. The Select Instrument Driver dialog box is displayed. Figure 62: Select Instrument Driver dialog box 6.
  • Page 114 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation 8. Select Next. The Name Virtual Instrument dialog box is displayed. Figure 63: Name Virtual Instrument dialog box 9. In the Virtual Instrument Name box, enter a name that you want to use to refer to the instrument. 10.

  • Page 115: How To Install The Keithley I/O Layer

    If you have a full version of TEK-VISA on your system, you can run Openchoice Instrument Manager. See the Tektronix documentation for information. If you have the Keysight IO Libraries Suite on your system, you can run Keysight Connection Expert to check your USB instruments.

  • Page 116: Set Voltage And Current Limit

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Set voltage and current limit Before you source voltage and current, you should specify a voltage and current limit. To configure the limit using the front-panel home screen: 1.

  • Page 117: Constant Voltage (Cv) And Constant Current (Cc) Mode

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Constant voltage (CV) and constant current (CC) mode The 2281S power supplies feature a constant voltage and constant current automatic crossover. This feature permits continuous operation in the transition from constant-voltage mode to constant-current mode as the load changes.
  • Page 118 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Figure 66: Constant voltage mode Crossover from the constant-voltage mode to the constant-current mode also occurs automatically in response to an increase in load. For example, connect a 5 Ω resistor to the binding posts on the front panel, set the voltage to 25 V and current limit to 1.0 A, and turn on the output.

  • Page 119: Select A Measurement Function

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual You can use the :FORMat:ELEMents SCPI command to set the constant current or constant voltage mode. To set the constant current mode, send: :FORMat:ELEMents "MODE, CC" To set the constant voltage mode, send: :FORMat:ELEMents "MODE, CV"...

  • Page 120: Battery Test

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Battery test The battery test function allows you to perform the following measurement functions. Measurement functions What the instrument measures Concurrent (V + I) Measure voltage and current of the battery at the same time Measure the battery resistance Measure the open voltage of the battery Measure the battery capacity...

  • Page 121: Selecting A Specific Measurement Range

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual The 2281S has multiple current measurement ranges and one voltage range. These ranges are listed in the following table. Model Current measurement range Voltage measurement range 2281S 10 A 20 V...

  • Page 122: Using Autoranging For Current Measurements

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation For a current measurement, send the command: SENSe:CURRent:RANGe <n> Where <n> is the positive full-scale value of the measurement range. To set the range for a concurrent measurement, send the command: SENSe:CONCurrent:RANGe <n>...

  • Page 123: Protection

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual To select measurement autoranging using the front-panel Measure Settings screen: 1. Press the MENU key. 2. Under Measure, select Settings. 3. Select the button next to Range. The Range dialog box is displayed. 4.

  • Page 124: Overvoltage Protection

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Overvoltage protection Overvoltage protection restricts the maximum voltage level that the instrument can source. This protects the device under test (DUT) from high voltage levels. For example, if a sense lead is disconnected or broken during a 4-wire sense measurement, the instrument can interpret the missing sense lead as a decrease in voltage and respond by increasing the source output.

  • Page 125: Overcurrent Protection

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Overcurrent protection Overcurrent protection restricts the maximum current level that the instrument can source. This protects the device under test (DUT) from high current levels. For example, if a sense lead is disconnected or broken during a 4-wire sense measurement, the instrument can interpret the missing sense lead as a decrease in voltage and respond by increasing the source output.

  • Page 126: Overtemperature Protection

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Overtemperature protection To prevent damaging heat build-up and ensure specified performance, make sure there is adequate ventilation and air flow around the instrument to ensure proper cooling. Do not cover the ventilation holes on the top, sides, or bottom of the instrument.

  • Page 127: Maximum Voltage Limits

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Figure 68: Overprotection error dialog box To clear an overprotection error using the front panel: When the overprotection error dialog box is displayed, you can press the ENTER key to initiate the trigger model.

  • Page 128: Saving Setups

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation To set the maximum voltage limit using SCPI commands: Send the :SOURce:VOLTage:LIMit command with the value of the limit. For example, to set the voltage limit for the current source to 25 V, send the command: :VOLTage:LIMit 25 See the command description for [:SOURce[n]]:<function>:PROTection[:LEVel]...

  • Page 129: Recall A User Setup

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual To save a user setup to internal nonvolatile memory using SCPI commands: Configure the instrument to the settings that you want to save. To save the setup, send the command: *SAV <n>...

  • Page 130: Specify A Default Setup

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation To recall a user setup from internal memory using SCPI commands: *RCL <n> Where <n> is an integer between 1 and 5 that represents the saved setup. To recall a user setup from external USB flash drive using SCPI commands: :MMEMory:LOAD:SETup "mysetup"...

  • Page 131: Save The Event Log To An External Flash Drive

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual To access the event log listing from the front panel: 1. Press the MENU key. 2. Under System, select Event Log. A list of errors is displayed. 3.

  • Page 132: Instrument Sounds

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation To view system information using SCPI commands: To retrieve the manufacturer, model number, serial number, and firmware version, send the command: *IDN? To read the line frequency, send the command: SYStem:LFRequency? The firmware build, memory available, and calibration date are not available when using SCPI commands.

  • Page 133: Reset The Instrument

    Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual The instrument also responds to other types of resets. These resets include: Password reset: This resets the instrument password to its default value. You can reset the password by pressing the MENU key and under System, selecting Settings >...
  • Page 134 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Math and statistics reset values Setting* Default value reset from Default value reset by the MENU > System > *RST (on page 7-7) Settings > Reset command or :SYSTem:PRESet page 7-175) command...
  • Page 135 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Calibration reset values Setting* Default value reset from Default value reset by MENU > System > *RST (on page 7-7) Settings > Reset command or :SYSTem:PRESet page 7-175) command Not available from front panel :CALibration:PROTected:STATe...
  • Page 136 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Format reset values Setting* Default value reset from Default value reset by MENU > System > Settings *RST (on page 7-7) command or > Reset :SYSTem:PRESet page 7-175) command "READ, SOUR, UNIT, Not available from front panel...
  • Page 137 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Measurement reset values Setting* Default value reset from Default value reset by the MENU > System > Settings *RST (on page 7-7) > Reset command or :SYSTem:PRESet page 7-175) command "CONC:DC"...
  • Page 138 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Source reset values Setting* Default value reset from Default value reset by the MENU > System > *RST (on page 7-7) Settings > Reset command or :SYSTem:PRESet (on page 7-175) command...
  • Page 139 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Status model reset values Setting* Default value reset from Default value MENU > System > reset by the *RST Settings > Reset (on page 7-7) command or :SYSTem:PRESet (on page 7-175) command...
  • Page 140 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Trigger reset values Setting* Default value reset from Default value reset by the MENU > System > Settings > *RST (on page 7-7) Reset command or :SYSTem:PRESet page 7-175) command 0 (Off)
  • Page 141 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Battery test source reset values Setting* Default value reset from Default value reset by the MENU > System > Settings *RST (on page 7-7) > Reset command or :SYSTem:PRESet page 7-175) command...
  • Page 142 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 2: General operation Battery test measure reset values Setting* Default value reset from Default value reset by the MENU > System > Settings *RST (on page 7-7) > Reset command or :SYSTem:PRESet page 7-175) command...
  • Page 143 Section 2: General operation Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Battery simulation reset values Setting* Default value reset from Default value reset by the MENU > System > Settings *RST (on page 7-7) > Reset command or :SYSTem:PRESet page 7-175) command MENU >...

  • Page 144: Functions And Features

    Section 3 Functions and features In this section: Instrument access ..............3-1 Graph ..................3-3 Output delay, slew rate, and source delay ....... 3-8 Data buffer ................3-11 Digital I/O ................3-22 Trigger model ................. 3-30 Level trigger ................3-34 List operation ................

  • Page 145: Changing The Instrument Access Mode

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Changing the instrument access mode To change the access mode Using SCPI commands: :SYST:PASS:MODE NONE :SYST:PASS:MODE ALL Changing the password If the instrument is set to the access mode of All, you must enter a password to change to a new control interface.

  • Page 146: Graph

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Graph You can configure the following settings that affect how readings appear on the Graph screen. Window position and zoom: Specify the readings that are displayed on the screen. Current and voltage auto adjustment: Automatically adjust the scale and offset of the Y-axis.

  • Page 147: Adjusting The Scale And Offset Of The Y-Axis

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual To change the window position and zoom on the front panel: 1. Press the MENU key. 2. Under Views, select Graph. 3. Select the button next to Window and press ENTER. The window setting screen is displayed. 4.
  • Page 148 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Figure 70: Graph auto adjustment To set the manual adjustment on the front panel: 1. Press the MENU key. 2. Under Views, select Graph. 3. Select the button next to I Manual Adjust or V Manual Adjust and press ENTER. 4.

  • Page 149: Graphing The Battery Test Function

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Graphing the battery test function The voltage, current, ampere-hour, and resistance values are represented in lines of different colors. As shown in the following figure, you can select the Y-axis scale by selecting the Y-axis button. Then you can place the marker by turning the navigation control.

  • Page 150: Graphing The Battery Simulation Function

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Graphing the battery simulation function For the battery simulation function, the values of Voc and current are represented in lines of different colors. As shown in the following figure, you can select the Y-axis scale by selecting the Y-axis button. You can place the marker by turning the navigation control.

  • Page 151: Output Delay, Slew Rate, And Source Delay

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Output delay, slew rate, and source delay The following delays occur when you turn on the output and source a specified voltage and current to device under test (DUT): Output delay: The period that the instrument waits before enabling and disabling the specified output.

  • Page 152: Slew Rate

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Using SCPI commands: To set output on and off delays, send the following commands: OUTP:DEL:RIS 2 OUTP:DEL:FALL 3 To enable the output delay, send the command: OUTP:DEL:STATe ON Slew rate When using the Power Supply mode, the slew rate determines the rate at which the voltage changes...

  • Page 153: Source Delay

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Source delay When the power supply is used to source and measure, the supply outputs a voltage and then measures output current and output voltage. There is always some small delay between the internal process of setting the output voltage and beginning a measurement.

  • Page 154: Data Buffer

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Data buffer The data buffer captures measurements, instrument status, and the output state of the instrument. The 2281S has only one buffer. The data buffer provides the following statistics: Average Minimum Maximum...

  • Page 155: Buffer Fill Status

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Buffer fill status You can determine buffer fill status from the front panel. As shown in the following figure, the active buffer indicator displays buffer fill status. Figure 74: Buffer indicator Setting reading buffer size and buffer mode To configure the buffer, configure the following settings:...
  • Page 156 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Buffer mode The buffer mode setting for the reading buffer controls how the incoming data is managed as the buffer fills. The options are: Never: The buffer stops accepting data. Next: The buffer stops accepting data once it fills to capacity and no new data is stored in the buffer.

  • Page 157: Viewing And Saving Buffer Content

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Using the front panel to set fill mode: 1. Press the MENU key. 2. Under Measure, select Data Buffers. 3. Select the button next to Mode. The Mode screen is displayed. 4.
  • Page 158 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Figure 75: Example of spreadsheet with reading buffer content The following table describes the information that is stored in each column of the spreadsheet. Heading Description Index Provides an identifier for each reading.
  • Page 159 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual The current and voltage values in the buffer are different for the measurement function. Measurement function Current Voltage Concurrent (V + I) Measured value for each Measured value for each voltage reading current reading Voltage (V)
  • Page 160 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Using the front panel to save buffer content to files To use the front panel to save or append buffer content to files: 1. Insert a USB flash drive into the USB port. 2.

  • Page 161: Configuring The Statistics Applied To Data In The Buffer

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Configuring the statistics applied to data in the buffer The data buffer provides the following statistics: Average Minimum Maximum Peak-to-peak Standard deviation. When using the power supply function, you can request any of the statistics from the front panel or using SCPI commands.
  • Page 162 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Specifying the data in the buffer to perform with statistics You must select either the voltage or current value in the buffer to perform statistics calculations. When you configure these settings, it affects the Graph and Data Sheet screen and the outputs of the following commands: :CALCulate2:IMMediate?
  • Page 163 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Formatting the statistical results You can specify the returned data elements for statistical calculations. The elements include value, reading number, unit, and time. You can specify one or more parameters. This only applies to minimum and maximum calculations.

  • Page 164: Clearing The Buffer

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Clearing the buffer You can clear all readings and statistics from the buffer. The following topics provide information about using the front panel or remote commands to clear a buffer. To use the front panel to clear a reading buffer: 1.

  • Page 165: Digital I/O

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Digital I/O You can use the 2281S digital input/output with the trigger model to control an external digital circuit, such as a device handler that is used to perform binning operations. To control or configure any of the six digital input/output lines, send commands to the 2281S over a remote interface.
  • Page 166 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features The following figure shows the basic configuration of the digital I/O port. Figure 79: Digital I/O port configuration 077114601 / March 2019 3-23...
  • Page 167 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Digital I/O lines The following table describes the possible pin configurations for the digital line function and action. Line mode Available work mode Available configurable lines Trigger in Power supply, battery test, Line 1...
  • Page 168 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features When you place a line in the Digital Out function, you can continue to select the actions. The level of the line will change when the condition of the action is met. The actions and conditions are: Sink<>Source: The instrument changes from source mode to sink mode, or conversely from sink mode to source mode.
  • Page 169 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Refer to the following figure for a simplified schematic of a sample control circuit for a relay. You can externally power a different device by replacing the relay coil with the other device. Figure 80: Digital I/O Vext (example external circuit) When using the V pin to control externally powered devices, make sure to configure the...

  • Page 170: Configuring Digital I/O Lines

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features +5 V line The digital I/O port provides a +5 V output. You can use this line to drive external logic circuitry. The maximum current output for this line is 500 mA (≥ 4.6 V). Configuring digital I/O lines You can use front panel or a remote interface to set up and control the digital I/O lines.
  • Page 171 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual For the battery test function Digital I/O line Function Action — Trigger in, manual output high, manual output low, and manual input Digital out, digital in, manual output high, Digital Out: Sink<>Source, Hi V, Low V, manual output low, and manual input CC<>CV, End...
  • Page 172 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Using SCPI commands to configure digital I/O lines To set the line mode on a specified line in the power supply function: :DIGital:LINE<n>:FUNCtion <function> To set the line mode on a specified line in the battery test and battery simulator functions: :BATTery:DIGital:LINE<n>:CONFigure <function>[,<action>] Where <n>...

  • Page 173: Trigger Model

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Trigger model The trigger model controls the sequence in which measurements occur. It consists of two layers (Arm Layer and Trigger Layer) to provide versatility. Programmable counters allow operations to be repeated, and various input and output trigger options are available to provide source-measure synchronization.

  • Page 174: Idle And Initiate

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Idle and initiate The instrument is in the idle state when it is not operating in the arm layer or trigger layer of the trigger model.

  • Page 175: Source, Source Delay, And Measure Actions

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Source, source delay, and measure actions The source-delay-measure (SDM) cycle consists of the following actions: Source: Programmed output current or voltage level changes are performed. It also performs the programmed slew rate during the level changes when the slew function is enabled.

  • Page 176: Running The Trigger Model

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Running the trigger model You can run the trigger model when the instrument is controlled either locally or remotely. If the instrument is being controlled locally, you can quickly configure the trigger model without setting up trigger source and trigger count in the trigger layer.
  • Page 177 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual If the instrument is controlled remotely, you can configure any of the parameters discussed above. If you change from remote to local control, the trigger model measurement method remains selected until you change it.

  • Page 178: Level Trigger

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Level trigger You can configure a triggering condition to start logging data in the data buffer during the test. You can specify that the trigger execute when the voltage or current rises above or falls below a specified level.
  • Page 179 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual The following figure illustrates how the level trigger is activated when the voltage rises. Figure 83: Voltage level trigger (rise) 3-36 077114601 / March 2019...

  • Page 180: Configuring A Current Level Trigger

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features The following figure illustrates how the level trigger is activated when the voltage falls. Figure 84: Voltage level trigger (fall) Configuring a current level trigger To configure a current level trigger from the front panel: 1.
  • Page 181 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual To configure a current level trigger, send the following SCPI commands: :TRACe[n]:TRIGger:CURRent:STATe :TRACe[n]:TRIGger:CURRent[:LEVel] :TRACe[n]:TRIGger:CURRent:DIRection :TRACe[n]:TRIGger:OFFSet When the level trigger is activated, data in the buffer is cleared (except the points specified by the Offset setting).

  • Page 182: List Operation

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features The following figure illustrates how the level trigger is activated when the current falls. Figure 86: Current level trigger (fall) List operation You can use lists in the power supply function to set up the instrument to source specific voltage and current values to a device under test (DUT).

  • Page 183: Configuring A List

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Configuring a list To set up a list from the front panel, select options from the SOURCE LIST screen. To configure a list on the front panel: 1.
  • Page 184 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features 7. After adding points to the list, select the Voltage box, Current box or Dwell box in the specified point row. Press the ENTER key. The editing window is displayed. You can use the numerical keys or the navigation control to change the value.

  • Page 185: Importing A List From An External Usb Flash Drive

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Importing a list from an external USB flash drive If you have created or saved a list file (.csv file), you can import the list from external USB flash drive. See the following figure for an example of a list .csv file.

  • Page 186: Exporting A List To An External Usb Flash Drive

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features To import a list from the external USB flash drive using SCPI commands: :LIST:LOAD:USB <list number>,<filename> Where <list number> is the list number from 1 to 9 and <filename> is the filename that contains a name of the imported list.
  • Page 187 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual When you run a list, you cannot change the following settings from front panel or using SCPI commands. Sending the following commands causes an error 210, "Not permitted with list enabled." Source settings that cause an error Setting Front-panel operations...
  • Page 188 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Measure settings that cause an error Setting Front-panel operations SCPI commands  Measurement :SENSe[n]:FUNCtion (on page 7-114) MENU > Measure function Settings > Function  HOME >...
  • Page 189 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Data buffer settings that cause an error Setting Front-panel operations SCPI commands   Buffer MENU > Data Buffers > :TRACe[n]:CLEar:AUTO or :DATA[n]:CLEar:AUTO Size (on page 7-186) ...
  • Page 190 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Running a list After configuring a list, you can run the list from the front panel. To run a list from the front panel: 1. Press the HOME key. 2.
  • Page 191 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual List triggering You must configure list triggering before running a list. List triggering is similar to common triggering. However, list triggering introduces dwell time to control the source-delay-measure cycle. For more information about the common triggering, refer to Trigger model (on page 3-30).
  • Page 192 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features List running time Depending on the hold time you select in the front-panel list options, there are two types of device actions during list running, shown in the following figures. Figure 89: Device action in time mode For list-running time in Time mode: Measurement time = Dwell - Source Delay...
  • Page 193 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual For list-running time in Point mode: Measurement Time = Sample Count * Sample Speed The set dwell time is ignored. Step mode triggering In step mode, the instrument generates a measure complete signal after each list step. You can detect this signal in digital I/O line 2.
  • Page 194 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features The following figure illustrates the process of measurement for step mode. Figure 92: Step mode measurement time When using immediate triggering, the instrument runs the next list step after sending the measure complete signal.
  • Page 195 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Sweep mode triggering In sweep mode, the instrument generates a measure complete signal after each list cycle. You can detect this signal in digital I/O line 2. For details, refer to Digital I/O (on page 3-22).

  • Page 196: Aborting A List

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features The following figure illustrates the process of measurement for sweep mode. Figure 94: Sweep mode measurement time Increasing the speed of a list To increase the speed of a list: Reduce the NPLC.

  • Page 197: Sink Operation

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Sink operation When the 2281S is operating as a sink, current has opposite polarity and the instrument is absorbing power rather than sourcing it. The instrument can be forced into sink operation by an external source, such as a battery, or an energy storage device, such as a capacitor.

  • Page 198: Battery Test

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Battery test The 2281S battery test function allow you to do charge and discharge tests, create a battery model, and make ESR, A-H, and capacitance measurements. Figure 96: The 2281S battery test function The following topics describe how to use the battery test function.

  • Page 199: Battery Charging And Discharging

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Battery charging and discharging When the 2281S is in the battery test function, the instrument and the battery under test can be connected in two-wire sense or in four-wire sense. However, the four-wire sense connection, as shown in the following figure, is recommended because it can cancel the wire resistance.

  • Page 200: Battery Discharging Test

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Battery discharging test As shown in the following figure, discharging is divided into two parts. Figure 98: Discharging phases Constant current phase: In the initial stage, the instrument discharges the battery in constant current mode.
  • Page 201 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual To discharge a battery using the front panel: 1. Select the battery test function in the startup screen. 2. Press the MENU key. 3. Under Source, select (Dis)charge. 4.

  • Page 202: Battery Charging Test

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Battery charging test Before the test, set the charging voltage V and the maximum current I-limit. As shown in the following figure, the charging is divided into two parts. Figure 99: Charging phases Constant current phase: In the initial stage, the instrument charges the battery with I-limit, and the output voltage is smaller than V...

  • Page 203: Generating And Editing A Battery Model

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual 6. Set the end current to 10 mA next to End condition. 7. Return to the battery test home screen by pressing HOME on the front panel. 8.
  • Page 204 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Figure 100: Setting voltage range for a battery model Generating a battery model To generate a battery model using the front panel: 1. Select the battery test function in the startup screen. 2.
  • Page 205 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Editing a battery model The generated battery model contains the information shown in the following figure. Figure 101: Battery model The first column is SOC from 0 percent to 100 percent. The second column and third columns are the corresponding values of open voltage and battery resistance.

  • Page 206: Esr Measurement

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features ESR measurement You can measure battery resistance (ESR) only when the 2281S is using the battery test function. Introduction to the ESR measurement The following figure shows a battery under test simplified as a resistance with constant voltage. During charging and discharging, its voltage and resistance change based on the charging of the SOC.
  • Page 207 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual The 2281S uses the open circuit measurement method to measure ESR in the battery test function. Figure 103: Open circuit ESR measurement Measurement process: 1. The 2281S is set to a high-resistance state (approximately 130 kΩ). 2.
  • Page 208 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Measuring ESR in the battery test function To measure ESR in the battery test function: Using the front panel: 1. Connect the battery to the instrument. 2.

  • Page 209: A-H Measurement

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual A-H measurement The 2281S can measure the battery capacity (A-H) only when it is in the battery test function. The instrument discharges the battery completely and then charges it completely; the charging capacity in represents the total battery capacity.
  • Page 210 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Measuring A-H in the battery test function To measure the battery capacity in the battery test function: Using the front panel: 1. Connect the battery to the instrument. 2.
  • Page 211 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Using SCPI commands: Connect the battery to the instrument. Send the command: :BATT:TEST:VOLT V1 Set the discharging target voltage to V1. Send the commands: :BATT:TEST:SENS:AH:VFUL V2 :BATT:TEST:SENS:AH:ILIM A2 :BATT:TEST:SENS:AH:ESRI S30 Set the V-Full to V2.

  • Page 212: Capacitance Measurement

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features Capacitance measurement The 2281S can measure capacitance (C) only when it is using the battery test function. The instrument charges the capacitor in constant current mode and monitors the voltage ramp rate to determine the ratio of delta voltage ( V) to delta time ( t).

  • Page 213: Battery Simulation

    Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Battery simulation The 2281S can simulate a real battery to test a device in a certain state of the battery for better test efficiency. The following topics explain the settings and measurement procedure. Figure 106: The 2281S battery simulation function Battery simulation settings If you are in the battery simulator function, press Menu.

  • Page 214: Simulating A Battery

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 3: Functions and features You can choose a battery model to simulate the battery in your lab. For details of other settings, refer Settings menu (on page 2-43). There are two methods of simulation: Static.
  • Page 215 Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual To set SOC to 80 percent, send the command: :BATT:SIM:SOC 80 The Voc is changed accordingly. To set the battery capacity to 200 mAh, send the command: :BATT:SIM:CAP:LIM 200mAh To set output on to start the simulation, send the command: :BATT:OUTP ON...

  • Page 216: Measurement Optimization

    Section 4 Measurement optimization In this section: Introduction ................4-1 Optimizing either measurement accuracy or speed ....4-1 Math calculations that you can apply to measurements ..4-11 Relative offset ................ 4-13 Displayed measurements ............4-15 ESR measurement ..............4-17 A-H measurement ..............

  • Page 217: Resolution

    Section 4: Measurement optimization Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Resolution When using the power supply function, you can specify a resolution to adjust the measurement accuracy and speed. In the battery test and battery simulation function, the highest resolution is applied automatically. Changing resolution affects NPLC, autozero, display digits, and average filter settings.
  • Page 218 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 4: Measurement optimization Resolution controls the best possible combination of reading speed, accuracy, and front-panel display digits. You can independently adjust the front-panel display digits using the front panel or remote commands.

  • Page 219: Nplc

    Section 4: Measurement optimization Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual NPLC You can adjust the amount of time that the input signal is measured. Adjustments to the amount of time affect the usable measurement resolution, the amount of reading noise, and the reading rate of the instrument.

  • Page 220: Autozero Measurements

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 4: Measurement optimization Setting speed using SCPI commands To set the NPLCs for current measurements, send the command: :SENSe:CURRent:NPLCycles <n> To set the NPLCs for concurrent measurements, send the command: :SENSe:CONCurrent:NPLCycles <n>...

  • Page 221: Displayed Digits

    Section 4: Measurement optimization Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual For example, when autozero is enabled, making 100 readings in the concurrent function with 1 NPLC takes a total measurement time of (50 Hz power line frequency): Total time = 5 * reading number * NPLC * (1/50) = 5 * 100 * 1 * (1/50) = 10 s When autozero is disabled, making 100 readings in the concurrent function with 1 NPLC takes a total measurement time of (50 Hz power line frequency):...

  • Page 222: Filtering Measurement Data

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 4: Measurement optimization The number of displayed digits does not affect accuracy or speed. It also does not affect the format of readings that are returned from a remote command. Setting the displayed digits using the front panel From the front panel: 1.
  • Page 223 Section 4: Measurement optimization Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual This feature is not available for the battery test and battery simulation functions. If you create test algorithms and you are using the averaging filters, make sure the algorithms clear the filter memory stacks at appropriate times to avoid averaging an inappropriate set of measurements.
  • Page 224 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 4: Measurement optimization The five window selections from the front panel are 0.01%, 0.1%, 1%, 10%, and 100%. Note that the 100% setting means that no limit is applied and all readings are included in the averaging. For voltage and current, the actual filter limit is expressed as a percent of range.
  • Page 225 Section 4: Measurement optimization Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Setting up the averaging filter Using the front panel: 1. Select the measurement function. The filter will be applied to this function. For more information, you can refer to Select a measurement function (on page 2-96).

  • Page 226: Math Calculations That You Can Apply To Measurements

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 4: Measurement optimization To enable the selected averaging filter: :SENS:CURR:AVER:STATe ON :SENS:CONC:AVER:STATe ON :SENS:VOLT:AVER:STATe ON Math calculations that you can apply to measurements The 2281S supports mx+b built-in math calculations in the power supply function. Math calculations are applied to the input signal after filter and relative offset operations are completed.

  • Page 227: Setting Mx+B Math Operations

    Section 4: Measurement optimization Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual The CALC indicator represents the filter and mx+b operation status. If filter or math operation is enabled, the CALC indicator is displayed to the right of the measurement. Setting mx+b math operations From the front panel: 1.

  • Page 228: Relative Offset

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 4: Measurement optimization Relative offset When making measurements when using the power supply function, you may want to subtract an offset value from a measurement. This feature is not available for the battery test and battery simulation functions. The relative offset feature subtracts a set value or a baseline reading from measurement readings.
  • Page 229 Section 4: Measurement optimization Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Setting a relative offset value You can set a specific relative offset value using the front panel or the remote commands. Using the front panel: 1. Select the measurement function. The relative offset will be applied to this function. For more information, you can refer to Select a measurement function (on page 2-96).

  • Page 230: Displayed Measurements

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 4: Measurement optimization Automatically acquiring a relative offset value When you automatically acquire a relative offset value, the 2281S performs the following actions: Makes a new measurement. Stores the measurement as the new relative offset level. Before you automatically acquire a reference for relative offset, make sure that the trigger model is not in idle mode, set the arm and trigger source to immediate, and turn on the output.
  • Page 231 Section 4: Measurement optimization Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual If any of these operations are set, the value that is displayed is the measurement reading with these operations applied. For example, if you made a measurement and had a relative offset specified, the measured value would have the relative offset applied.

  • Page 232: Select The Source Of Readings

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 4: Measurement optimization Select the source of readings You can select the source of readings saved to the buffer using the front panel or SCPI commands. Using the front panel: 1.

  • Page 233: Esr Measurement

    Section 4: Measurement optimization Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual ESR measurement You can measure battery resistance (ESR) only when the 2281S is using the battery test function. Introduction to the ESR measurement The following figure shows a battery under test simplified as a resistance with constant voltage. During charging and discharging, its voltage and resistance change based on the charging of the SOC.
  • Page 234 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 4: Measurement optimization The 2281S uses the open circuit measurement method to measure ESR in the battery test function. Figure 112: Open circuit ESR measurement Measurement process: 1. The 2281S is set to a high-resistance state (approximately 130 kΩ). 2.

  • Page 235: Measuring Esr In The Battery Test Function

    Section 4: Measurement optimization Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Measuring ESR in the battery test function To measure ESR in the battery test function: Using the front panel: 1. Connect the battery to the instrument. 2.

  • Page 236: A-H Measurement

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 4: Measurement optimization A-H measurement The 2281S can measure the battery capacity (A-H) only when it is in the battery test function. The instrument discharges the battery completely and then charges it completely; the charging capacity in represents the total battery capacity.

  • Page 237: Measuring A-H In The Battery Test Function

    Section 4: Measurement optimization Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Measuring A-H in the battery test function To measure the battery capacity in the battery test function: Using the front panel: 1. Connect the battery to the instrument. 2.
  • Page 238 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 4: Measurement optimization Send the commands: :BATT:TEST:SENS:AH:VFUL V2 :BATT:TEST:SENS:AH:ILIM A2 :BATT:TEST:SENS:AH:ESRI S30 Set the V-Full to V2. Set the maximum charging limit to A2. Set the sampling interval to 30 s. Send the commands: :BATT:TEST:SENS:AH:EXEC STAR :STAT:OPER:INST:ISUM:COND?

  • Page 239: Simple Voltage Output And Current Measurement

    Section 5 Application examples In this section: Simple voltage output and current measurement ..... 5-1 Configure and execute a 10-step linear list sweep ....5-3 Perform a fast current load measurement ........ 5-7 Battery test ................5-12 Battery simulation test ............5-15 Simple voltage output and current measurement This example demonstrates how to configure a voltage output make a precision voltage and current measurement using the default instrument configuration.

  • Page 240: Device Connections

    Section 5: Application examples Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Figure 114: 2281S remote interface connections Device connections Connect the DUT (for this example, a 1 kΩ resistor) to the output binding posts on the front panel. For details, refer to Two-wire local sense connection (on page 2-63).

  • Page 241: Configure And Execute A 10-Step Linear List Sweep

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 5: Application examples 6. Press the OUTPUT switch to turn the output on. Figure 115: Voltage and current readback To set the voltage and current limit, send the following SCPI commands: *RST :VOLT 5 :CURR 1...

  • Page 242: Set Up Remote Communications

    Section 5: Application examples Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Set up remote communications You can run this application from the front panel or any of the supported communication interfaces for the instrument (GPIB, USB, or ethernet). The following figure shows the rear-panel connection locations for the remote communication interfaces.
  • Page 243 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 5: Application examples 5. Highlight Insert and press ENTER to increment the points display until it reads 10. 6. Select the Voltage box in the point 1 row. Press ENTER. 7.

  • Page 244: Execute A 10-Step Linear List Sweep

    Section 5: Application examples Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Execute a 10-step linear list sweep To execute a list sweep on the front panel: 1. In the startup screen, choose the power supply function. 2. Press the MENU key. 3.

  • Page 245: Perform A Fast Current Load Measurement

    1. This measurement is made in the power supply function. Equipment required One 2281S power supply Dual-channel arbitrary function generator (Tektronix AFG3102C) Oscilloscope Resistors: 2.5 Ω and 20 Ω nMOSFET 077114601 / March 2019...

  • Page 246: Set Up Remote Communications

    Figure 119: 2281S remote interface connections Device connections Use a Tektronix two-channel AFG (for example, AFG3102C or equivalent) to generate two synchronous pulse signals. One signal is used to control the on and off state of nMOSFET. The other is used as the external triggering signal for 2281S. For details, refer to the following table.
  • Page 247 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 5: Application examples Figure 120: Fast current measurements setup Connect the digital I/O pin 1 and pin 9 with AFG output channel. For details on digital I/O, refer to Digital I/O (on page 3-22).

  • Page 248: Measure The Fast Current Load Changes

    Section 5: Application examples Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Measure the fast current load changes To perform a fast current load measurement on the front panel: 1. In the startup screen, choose the power supply function. 2.
  • Page 249 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 5: Application examples 20. Press the V-Set or I-Limit soft key. The editing window is displayed at the bottom of the screen. 21. Set the voltage to 5 V and current limit to 3 A. Press the OUTPUT switch to turn on the output.To view the current measurements on the front panel: 1.
  • Page 250 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual The following graphic shows the Tektronix oscilloscope plot of the generator pulse output and the load current. The green waveform shows the changes of load current and the yellow waveform shows the pulse output.

  • Page 251: Battery Test

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 5: Application examples Battery test The following example demonstrates the procedure of conducting a battery test and generating a battery model with 2281S in the battery test function. Equipment required One 2281S DC Power Supply and Battery Simulator Rechargeable batteries Wires...
  • Page 252 Section 5: Application examples Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual 8. Under Measure, select A-H. 9. Set the target voltage next to V-Full. If the battery works in the range of 3.8 V to 4.2 V, set this value slightly higher than 4.2 V.
  • Page 253 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 5: Application examples To test a battery and generate a battery model using SCPI commands: Connect the battery to the instrument. Send the commands: :BATT:TEST:VOLT V1 :BATT:OUTP ON Set the discharging target voltage to V1. Set the end current to A1.

  • Page 254: Battery Simulation Test

    Section 5: Application examples Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Battery simulation test The following example demonstrates the procedure of simulating a battery with 2281S in the battery simulation function. Equipment required One 2281S DC Power Supply and Battery Simulator A cellphone supplied by a battery Wires Device connections...

  • Page 255: Simulate A Battery With The 2281S

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 5: Application examples Simulate a battery with the 2281S To simulate a battery with the 2281S using the front panel: 1. Select the battery simulator function in the startup screen. 2.

  • Page 256: Explanations Of The Test

    Section 5: Application examples Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual 8. To set output on to start the simulation, send the command: :BATT:OUTP ON Explanations of the test During the simulation test, when you turn on the cellphone, you can see from the display that the battery simulator is sourcing the cellphone and the current is positive.

  • Page 257: Introduction To Scpi Commands

    Section 6 Introduction to SCPI commands In this section: Introduction to SCPI ..............6-1 SCPI command programming notes ........6-2 Introduction to SCPI The Standard Commands for Programmable Instruments (SCPI) standard is a syntax and set of commands that is used to control test and measurement devices. The following information describes some basic SCPI command information and how SCPI is used with the 2281S and presented in the 2281S documentation.

  • Page 258: Command Execution Rules

    Section 6: Introduction to SCPI commands Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual The examples above show commands that are sent individually. You can also group command messages when you send them to the instrument. To group a set of commands, separate them with semicolons.
  • Page 259 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 6: Introduction to SCPI commands Optional command words If a command word is enclosed in brackets ([ ]), the command word is optional. Do not include the brackets if you send the optional command word to the instrument. For example, you can send the command :STATus:MEASurement[:EVENt]? in any of the following formats: :STATus:MEASurement:EVENt?
  • Page 260 Section 6: Introduction to SCPI commands Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual SCPI parameters The parameters of the SCPI commands are shown in angle brackets (< >). For example: :SYSTem:BEEPer:ERRor:STATe <state> The type of information that you can use to replace <state> is defined in the Usage section of the command description.

  • Page 261: Using The Scpi Command Reference

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 6: Introduction to SCPI commands Using the SCPI command reference The SCPI command reference contains detailed descriptions of each of the SCPI commands that you can use to control your instrument. Each command description is broken into several standard subsections.
  • Page 262 Section 6: Introduction to SCPI commands Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Command name and summary table Each instrument command description starts with the command name, followed by a table with relevant information for each command. Definitions for the numbered items below are listed following the figure.
  • Page 263 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 6: Introduction to SCPI commands Command usage The Usage section of the remote command listing shows how to properly structure the command. Each line in the Usage section is a separate variation of the command usage; all possible command usage options are shown here.
  • Page 264 Section 6: Introduction to SCPI commands Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Example section The Example section of the command description shows some simple examples of how the command can be used. Figure 129: SCPI command description example 1.

  • Page 265: Scpi Command Reference

    Section 7 SCPI command reference In this section: Common commands ..............7-1 :ABORt[n] ................7-12 :CONFigure[n]:<function> ............7-13 :ENTRy[n]:FUNCtion .............. 7-14 :FETCh[n]? ................7-15 :FORCe:TRIGger ..............7-16 :FORMat:ELEMents ............... 7-17 :MEASure[n]:<function>? ............7-18 :READ[n]? ................7-20 ARM subsystem ..............7-21 BATTery subsystem ...............

  • Page 266: Cls

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual You can group command messages when you send them to the instrument. Use a semicolon to separate multiple commands, as shown below: *RST; *CLS; *ESE 32; *OPC? Although the commands in this section are shown in uppercase, common commands are not case sensitive (you can use either uppercase or lowercase).

  • Page 267: Ese

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference *ESE This command sets and queries bits in the Standard Event Status Enable Register. Type Affected by Where saved Default value Command and query Power cycle Not saved See Details Usage...

  • Page 268: Esr

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual *ESR? This command reads the contents of the Standard Event Status Register (SESR). Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage *ESR?

  • Page 269: Lang

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example *IDN? Output: KEITHLEY INSTRUMENTS INC.,MODEL 2281S-20-6,01234567,01.00 Also see System information (on page 2-108) *LANG? This command determines which command set is used by the instrument. Type Affected by Where saved...

  • Page 270: Opc

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual *OPC This command sets the operation complete (OPC) bit after all pending commands, including overlapped commands, have been executed. Type Affected by Where saved Default value Command and query Not applicable Not applicable...

  • Page 271: Rst

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference *RST This command resets the instrument settings to their default values. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage *RST Details...

  • Page 272: Sre

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual *SRE This command sets and queries the bits of Status Request Enable Register. Type Affected by Where saved Default value Command and query Power cycle Not saved See Details Usage...

  • Page 273: Stb

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference *STB? This command reads the contents of Status Byte Register. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage *STB? Details...

  • Page 274: Tst

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Example *RST Restore RST defaults. :ARM:SOUR BUS Select BUS control source for arm layer. :ARM:COUN 1 Set arm layer count to 1. :TRIG:SOUR IMM Set the source trigger layer to trigger immediately. :TRIG:COUN 1 Set trigger layer count to 1.
  • Page 275 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Details There are two types of instrument commands: Overlapped commands: Commands that allow the execution of subsequent commands while instrument operations of the overlapped command are still in progress. Sequential commands: Commands whose operations must finish before the next command is executed.

  • Page 276: Abort[N]

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :ABORt[n] This command stops all trigger model commands on the instrument. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage :ABORt[n] Channel number: For single-channel instruments, the value is 1...

  • Page 277: Configure[N]:

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :CONFigure[n]:<function> This command configures the instrument to a specific setup for measurements. Type Affected by Where saved Default value Command only Recall settings Save settings See Details Instrument reset Power cycle...

  • Page 278: Entry[N]:Function

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :ENTRy[n]:FUNCtion This command sets the instrument to work in one of its functions. Type Affected by Where saved Default value Command and query Power cycle Save settings ENTRy Usage...
  • Page 279 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :FETCh[n]? This command reads the latest post-processed reading. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage :FETCh[n]? Channel number: For single-channel instruments, the value is 1 Details This command requests the latest post-processed reading.

  • Page 280: Force:trigger

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :FORCe:TRIGger This command bypasses the control source (Arm layer or Trigger layer) when you do not wish to wait for the programmed event to occur. Type Affected by Where saved...

  • Page 281: Format:elements

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :FORMat:ELEMents This command specifies or queries data elements to be included in the data string. Type Affected by Where saved Default value Command and query Recall settings Save settings READ, SOUR, UNIT, REL...

  • Page 282: Measure[N]:

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Example :FORMat:ELEMents "READ,TST" Include reading and timestamp in the reading buffer, Example output: +8.034562E-03, 07/01/2013 19:21:36.2553 Also see :FETCh[n]? (on page 7-15) :MEASure[n]:<function>? (on page 7-18) :READ[n]? (on page 7-20) :MEASure[n]:<function>?
  • Page 283 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference If a different function is selected, sending this command changes the measurement function to the one specified by <function>. This function remains selected after the measurement is complete. When this command is sent, the following commands execute in the following order: ...
  • Page 284 Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :READ[n]? This query makes measurements and returns the first reading. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage :READ[n]? Channel number: For single-channel instruments, the value is 1...

  • Page 285: Arm Subsystem

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference ARM subsystem The commands in this subsystem configure and control the trigger model for the arm layer. :ARM[:SEQuence[n]]:COUNt This command sets the number of times to repeat the Arm event. Type Affected by Where saved...

  • Page 286: Arm[:Sequence[N]]:Source

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :ARM[:SEQuence[n]]:SOURce This command selects the control source for the arm layer. Type Affected by Where saved Default value Command and query Recall settings Save settings Instrument reset Power cycle Usage...

  • Page 287: Battery Subsystem

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference BATTery subsystem The commands in this subsystem configure and control the operations related to the functions of battery test and battery simulator. :BATTery[n]:DATA:CLEar This command clears all the data in the buffer. Type Affected by Where saved...
  • Page 288 Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual For example, if BATTery:DATA:DATA? "VOLT, CURR" is sent, the subsequent BATTery:DATA:DATA? "MODE" command will not return the current and voltage information. You can get additional buffer data by sending the command BATTery:DATA:DATA:SELected?. When specifying buffer elements, you can: Specify buffer elements in any order.

  • Page 289: Battery[N]:Data:data:selected

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:DATA:DATA:SELected? This command queries the data from the trace buffer of specific points. Type Affected by Where saved Default value Query only Recall settings Not applicable Not applicable Instrument reset Power cycle...

  • Page 290: Battery[N]:Data:save

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:DATA:SAVE This command saves the data in the buffer to a USB flash drive. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage...

  • Page 291: Battery:digital:line:Configure

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery:DIGital:LINE<line_index>:CONFigure This command sets the digital I/O line function. Type Affected by Where saved Default value Line 1 – AUTO Command and query Recall settings Save settings Line 2 –...

  • Page 292: Battery:digital:line:Edge

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery:DIGital:LINE<n>:EDGe This command selects the edge direction of the level trigger for digital in and digital out. Type Affected by Where saved Default value Command and query Recall settings Save settings RISE...

  • Page 293: Battery[N]:Model:load:usb

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:MODel:LOAD:USB This command imports a model from a USB flash drive to the internal memory. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage...

  • Page 294: Battery[N]:Model:

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:MODel<modelindex>:<element> This command sets and queries a list of custom values for a specified battery model. Type Affected by Where saved Default value Command and query Recall settings Save settings Nonvolatile memory...

  • Page 295: Battery[N]:Model::Append

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:MODel<modelindex>:<element>:APPend This command adds values to the specified model. Type Affected by Where saved Default value Command only Instrument reset Nonvolatile memory Not applicable Usage :BATTery[n]:MODel<modelindex>:<element>:APPend <string>...

  • Page 296: Battery[N]:Model::Simplify

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:MODel<modelindex>:<element>:SIMPlify This command sets 11 points of the value for a battery model in a rough form. Type Affected by Where saved Default value Command and query Recall settings Nonvolatile memory Not applicable...

  • Page 297: Battery[N]:Model::Steps

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:MODel<modelindex>:<element>:STEPs? This command queries the length of the specified model. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage :BATTery[n]:MODel<modelindex>:<element>:STEPs? Channel number: For single-channel instruments, the value is 1...

  • Page 298: Battery[N]:Model:Row

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:MODel<modelindex>:ROW<rowindex> This command sets the values of open-circuit voltage and resistance for a specified battery model. Type Affected by Where saved Default value Command and query Recall settings Nonvolatile memory Not applicable...

  • Page 299: Battery[N]:Model:rcl

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:MODel:RCL This command recalls a battery model from a memory. Type Affected by Where saved Default value Command and query Recall settings Save settings Not applicable Instrument reset Power cycle Usage...

  • Page 300: Battery[N]:Model:save:internal

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:MODel:SAVE:INTernal This command saves a battery model to the internal memory. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage :BATTery[n]:MODel:SAVE:INTernal <modelindex>...

  • Page 301: Battery[N]:Model:save:usb

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:MODel:SAVE:USB This command saves a battery model to a USB flash drive. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage :BATTery[n]:MODel:SAVE:USB <modelindex>,<fileName>...

  • Page 302: Battery[N]:Simulator:capacity:limit

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:SIMulator:CAPacity:LIMit This command sets the maximum capacity value of the battery in the battery simulation function. Type Affected by Where saved Default value Command and query Recall settings Save settings 0.01 Ah...

  • Page 303: Battery[N]:Simulator:current

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:SIMulator:CURRent? This command queries the real-time battery current of the battery simulator. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage :BATTery[n]:SIMulator:CURRent?

  • Page 304: Battery[N]:Simulator:current:protection[:Level]

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Example :BATT:SIM:CURR:LIM 1 Set the current limit to 1 A. Also see None :BATTery[n]:SIMulator:CURRent:PROTection[:LEVel] This command sets the current protection value in the battery simulator function. Type Affected by Where saved...

  • Page 305: Battery[N]:Simulator:hv

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:SIMulator:HV This command sets the high voltage (HV) in the battery simulator function. Type Affected by Where saved Default value Command and query Recall settings Save settings 21 V Instrument reset...

  • Page 306: Battery[N]:Simulator:lv

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:SIMulator:LV This command sets the low voltage (LV) in the battery simulator function. Type Affected by Where saved Default value Command and query Recall settings Save settings Instrument reset Power cycle...

  • Page 307: Battery[N]:Simulator:method

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:SIMulator:METHod This command sets the simulation mode in the battery simulation function. Type Affected by Where saved Default value Command and query Recall settings Save settings DYNamic Instrument reset Power cycle...

  • Page 308: Battery[N]:Simulator:resistance

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:SIMulator:RESistance? This command queries the real-time internal resistance of the battery simulator. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage :BATTery[n]:SIMulator:RESistance?

  • Page 309: Battery[N]:Simulator:sample:interval

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example :BATT:SIM:RES:OFFS 1 Set the offset value to 1 Ω and query the value. :BATT:SIM:RES:OFFS? Return: 1 Also see None :BATTery[n]:SIMulator:SAMPle:INTerval This command sets and queries the sample interval in the battery simulation function. Type Affected by Where saved...

  • Page 310: Battery[N]:Simulator:soc

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:SIMulator:SOC This command sets the SOC value in percentage for the battery simulator function. Type Affected by Where saved Default value Command and query Recall settings Not saved 100% Instrument reset...

  • Page 311: Battery[N]:Simulator:tvoltage

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:SIMulator:TVOLtage? This command queries the real-time terminal voltage. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage :BATTery[n]:SIMulator:TVOLtage? Channel number: For single-channel instruments, the value is 1 Example :BATT:SIM:TVOL?

  • Page 312: Battery[N]:Simulator:voc

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Example :BATT:SIM:TVOLTAGE:PROT 12 Set the TVOLtage protection value to 12 V and query :BATT:SIM:TVOLTAGE:PROT? the value. Return: 12 Also see None :BATTery[n]:SIMulator:VOC This command sets the Voc value for the battery simulator function. Type Affected by Where saved...

  • Page 313: Battery[N]:Simulator:voc:empty

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:SIMulator:VOC:EMPTy This command sets the threshold Voc value for the discharging to stop in the battery simulator function. Type Affected by Where saved Default value Command and query Recall settings Save settings...

  • Page 314: Battery[N]:Simulator:voc:full

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:SIMulator:VOC:FULL This command sets the threshold Voc value for the charging to stop in the battery simulator function. Type Affected by Where saved Default value Command and query Recall settings Save settings...

  • Page 315: Battery[N]:Test:measure:evoc

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:TEST:MEASure:EVOC? This command queries the values of ESR and Voc when the power supply is in Battery Test mode. Type Affected by Where saved Default value Query only Not applicable Not applicable...

  • Page 316: Battery[N]:Test:sense:ah:execute

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:TEST:SENSe:AH:EXECute This command sets the status of the A-H measurement. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage :BATTery[n]:TEST:SENSe:AH:EXECute <action>...

  • Page 317: Battery[N]:Test:sense:ah:gmodel:save:internal

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Details This command specifies the range of open-circuit voltage for generating the battery model. For generating a battery model, you need to specify the minimum Voc <low> and the maximum Voc <high>.

  • Page 318: Battery[N]:Test:sense:ah:gmodel:save:usb

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:TEST:SENSe:AH:GMODel:SAVE:USB This command saves the measurement results to a USB flash drive as a battery model. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable...

  • Page 319: Battery[N]:Test:sense:ah:ilimit

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:TEST:SENSe:AH:ILIMit This command sets and queries the maximum charging current during A-H measurement in the battery test function. Type Affected by Where saved Default value Command and query Recall settings Save settings...

  • Page 320: Battery[N]:Test:sense:ah:vfull

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:TEST:SENSe:AH:VFULl This command sets and queries the full voltage during A-H measurement in the battery test function. Type Affected by Where saved Default value Command and query Recall settings Save settings Instrument reset...

  • Page 321: Battery[N]:Test:sense:sample:interval

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example :BATT:TEST:SENS:EVOC:DEL 0.05 Set the EVoc delay to 0.05 s. Also see :BATTery[n]:TEST:MEASure:EVOC? (on page 7-51) :BATTery[n]:TEST:SENSe:SAMPle:INTerval This command sets and queries the sample interval in the battery test function. Type Affected by Where saved...

  • Page 322: Battery[N]:Test[:Source]:Current:end

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:TEST[:SOURce]:CURRent:END This command sets the end current for stopping the charging and discharging in the battery test function. Type Affected by Where saved Default value Command and query Recall settings Save settings...

  • Page 323: Battery[N]:Test[:Source]:Current:limit:source

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:TEST[:SOURce]:CURRent:LIMit:SOURce This command sets the maximum source current in the battery test function. Type Affected by Where saved Default value Command and query Recall settings Save settings 6.1 A Instrument reset...

  • Page 324: Battery[N]:Test[:Source]:Current:protection[:Level]

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:TEST[:SOURce]:CURRent:PROTection[:LEVel] This command sets and queries the protection threshold value of the output current in the battery test function. Type Affected by Where saved Default value Command and query Recall settings Save settings...

  • Page 325: Battery[N]:Test[:Source]:Hv

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:TEST[:SOURce]:HV This command sets the high voltage (HV) in the battery test function. Type Affected by Where saved Default value Command and query Recall settings Save settings 21 V Instrument reset...

  • Page 326: Battery[N]:Test[:Source]:Lv

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:TEST[:SOURce]:LV This command sets the low voltage (LV) value in the battery test function. Type Affected by Where saved Default value Command and query Recall settings Save settings Instrument reset Power cycle...

  • Page 327: Battery[N]:Test[:Source]:Voltage[:Level]

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:TEST[:SOURce]:VOLTage[:LEVel] This command sets the V-set value for charging and discharging in the battery test function. Type Affected by Where saved Default value Command and query Recall settings Save settings Instrument reset...

  • Page 328: Battery[N]:Test[:Source]:Voltage:limit

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:TEST[:SOURce]:VOLTage:LIMit This command sets the maximum output voltage in the battery test function. Type Affected by Where saved Default value Command and query Recall settings Save settings 20 V Instrument reset...

  • Page 329: Battery[N]:Test[:Source]:Voltage:protection[:Level]

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:TEST[:SOURce]:VOLTage:PROTection[:LEVel] This command sets and queries the protection threshold value of the open-circuit voltage in the battery test function. Type Affected by Where saved Default value Command and query Recall settings Save settings...

  • Page 330: Battery[N]:Trace:trigger:current:direction

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:TRACe:TRIGger:CURRent:DIRection This command specifies whether the current rises above or falls below a specified level when the level trigger is activated. Type Affected by Where saved Default value Command and query Power cycle...

  • Page 331: Battery[N]:Trace:trigger:current:state

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:TRACe:TRIGger:CURRent:STATe This command sets and queries the state of current level trigger. Type Affected by Where saved Default value Command and query Power cycle Not applicable 0 (OFF) Usage :BATTery[n]:TRACe:TRIGger:CURRent:STATe <state>...

  • Page 332: Battery[N]:Trace:data

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:TRACe:DATA? This command queries the data from the trace buffer. Type Affected by Where saved Default value Query only Recall settings Not applicable Not applicable Instrument reset Power cycle Usage...
  • Page 333 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference The options for <bufferElements> are described in the following table. Options Description Example VOLTage The voltage value +4.566723E+01 CURRent The current value +8.034562E-03 Value of State of charge, only available in SIMulator mode 95.50 RESistance Internal resistance value in SIMulator mode;...

  • Page 334: Battery[N]:Trace:data:selected

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:TRACe:DATA:SELected? This command queries the data from the trace buffer of specific points. Type Affected by Where saved Default value Query only Recall settings Not applicable Not applicable Instrument reset Power cycle...

  • Page 335: Battery[N]:Trace:save

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:TRACe:SAVE This command saves the data in the buffer to a USB flash drive. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage...

  • Page 336: Battery[N]:Trace:trigger:occur

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:TRACe:TRIGger:OCCur? This command queries whether a level trigger has occurred both in the battery simulator and battery test function. Type Affected by Where saved Default value Query only Not applicable Not applicable...

  • Page 337: Battery[N]:Trace:trigger:voltage:direction

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:TRACe:TRIGger:VOLTage:DIRection This command specifies whether the voltage rises above or falls below a specified level when the level trigger is activated. Type Affected by Where saved Default value Command and query Power cycle...

  • Page 338: Battery[N]:Trace:trigger:voltage:state

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:TRACe:TRIGger:VOLTage:STATe This command sets and queries the state of voltage level trigger. Type Affected by Where saved Default value Command and query Power cycle Not applicable 0 (OFF) Usage :BATTery[n]:TRACe:TRIGger:VOLTage:STATe <state>...

  • Page 339: Battery[N]:Output:protection:tripped

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :BATTery[n]:OUTPut:PROTection:TRIPped? This command queries whether over-protection has been tripped both in the battery simulator and battery test function. Type Affected by Where saved Default value Query only Not applicable Not applicable...

  • Page 340: Battery[N]:Output[:State]

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :BATTery[n]:OUTPut[:STATe] This command sets the state of the instrument output. Type Affected by Where saved Default value Command and query Recall settings Save settings 0 (OFF) Instrument reset Power cycle Usage...

  • Page 341: Calculate Subsystem

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference CALCulate subsystem The commands in this subsystem configure and control the math and statistic operations. :CALCulate[1]:<function>:FORMat This command specifies which math operation is performed on measurements. Type Affected by Where saved...

  • Page 342: Calculate[1]::Kmath:mbfactor

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :CALCulate[1]:<function>:KMATh:MBFactor This command specifies the offset for the y = mx + b operation. Type Affected by Where saved Default value Command and query Recall settings Save settings Instrument reset Power cycle...

  • Page 343: Calculate[1]::Kmath:mmfactor

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Also see :CALCulate[1]:<function>:FORMat (on page 7-77) :CALCulate[1]:<function>:KMATh:MMFactor (on page 7-79) :CALCulate[1]:<function>:KMATh:MUNits (on page 7-80) :CALCulate[1]:<function>:STATe (on page 7-81) :CALCulate[1]:<function>:KMATh:MMFactor This command specifies the scale factor for the y = mx + b math operation. Type Affected by Where saved...
  • Page 344 Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Example :CALC:VOLT:FORM MXB Set the math function for voltage measurements to mx + b. :CALC:VOLT:KMAT:MMF 0.80 Set the scale factor for voltage measurements to 0.80. :CALC:VOLT:KMAT:MBF 50 Set the offset factor to 50.

  • Page 345: Calculate[1]::State

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Also see :CALCulate[1]:<function>:FORMat (on page 7-77) :CALCulate[1]:<function>:KMATh:MBFactor (on page 7-78) :CALCulate[1]:<function>:KMATh:MMFactor (on page 7-79) :CALCulate[1]:<function>:STATe (on page 7-81) :CALCulate[1]:<function>:STATe This command enables or disables the math operations. Type Affected by Where saved...

  • Page 346: Calculate2:Data

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :CALCulate2:DATA? This command reads the results of specified statistics. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage :CALCulate2:DATA? :CALCulate2:DATA? <channel>...
  • Page 347 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example *RST Before the calculation, start the trigger model to take 10 :TRAC:CLE readings. :TRIG:COUN 10 :VOLT 6 The first CALC2:IMM? returns reading, units, timestamp :OUTP ON and reading number for MIN and MAX: :INIT...

  • Page 348: Calculate2:Format

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :CALCulate2:FORMat This command selects or queries which math statistics are used on readings stored in the buffer. Type Affected by Where saved Default value Command and query Recall settings Save settings MIN, MAX, MEAN, PKPK, SDEV...
  • Page 349 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example *RST Before the calculation, start the trigger model to take 10 :TRAC:CLE readings. :TRIG:COUN 10 :VOLT 6 The first CALC2:IMM? returns reading, units, timestamp :OUTP ON and reading number for MIN and MAX: :INIT...

  • Page 350: Calculate2:Format:elements

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :CALCulate2:FORMat:ELEMents This command specifies or queries data elements to be included in the data string. It only influences minimum and maximum query results. Type Affected by Where saved Default value Command and query...
  • Page 351 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example *RST Before the calculation, start the trigger model to take 10 :TRAC:CLE readings. :TRIG:COUN 10 :VOLT 6 The first CALC2:IMM? returns reading, units, timestamp :OUTP ON and reading number for MIN and MAX: :INIT...
  • Page 352 Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Example *RST Before the calculation, start the trigger model to take 10 :TRAC:CLE readings. :TRIG:COUN 10 :VOLT 6 The first CALC2:IMM? returns reading, units, timestamp :OUTP ON and reading number for MIN and MAX: :INIT...
  • Page 353 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference When the statistics operations are disabled, sending this command will not perform the statistic operations. However, it will return the last calculation results. If the specified statistics calculations have never been performed, the instrument returns -1.000000E+37.

  • Page 354: Calculate2:State

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :CALCulate2:STATe This command enables or disables the statistic calculations. Type Affected by Where saved Default value Command and query Recall settings Save settings 0 (OFF) Instrument reset Power cycle Usage...

  • Page 355: Calibration Subsystem

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference CALibration subsystem The commands in this subsystem configure and control the calibration operations. :CALibration:PROTected:CANCel This command cancels the calibration procedures and drops the new constants. Affected by Where saved Default value...

  • Page 356: Calibration:protected:code

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :CALibration:PROTected:CODE This command changes the calibration password. Type Affected by Where saved Default value Command only Recall settings Nonvolatile memory "KI002281" Usage :CALibration:PROTected:CODE <string> <string> Calibration password: An 8-character string including letters and numbers.

  • Page 357: Calibration:protected:data

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :CALibration:PROTected:DATA? This command queries the saved calibration constants. Type Affected by Where saved Default value Query only Not applicable Nonvolatile memory Not applicable Usage :CALibration:PROTected:DATA? Details For details, refer to Calibration constants...

  • Page 358: Calibration:protected[:Dc[N]]:Step

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Example :CAL:PROT:DATE 2014, 5, 12 Set the calibration date to May 12, 2014. Also see None :CALibration:PROTected[:DC[n]]:STEP<step> This command performs the calibration procedures. Type Affected by Where saved Default value Command only...
  • Page 359 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :CAL:PROT:STEP3:DATA Enter the voltage and resistance readings from the 0.00505,5.05 external DMM. *OPC? Wait until step 3 finishes. When finished, this command returns 1. :CAL:PROT:STEP4 Start current ADC full-scale calibration on the 100 mA range.

  • Page 360: Calibration:protected[:Dc[N]]:Step:Data

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :CALibration:PROTected[:DC[n]]:STEP<step>:DATA This command enters the values for calibration calculations. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage :CALibration:PROTected[:DC[n]]:STEP1:DATA <voltage>...
  • Page 361 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example :CAL:PROT:STAT ON, "KI002281" Enable the calibration mode. :CAL:PROT:STEP1 Start voltage DAC and ADC zero-calibration point. :CAL:PROT:STEP1:DATA 0.2996 Enter the voltage reading from the external DMM. *OPC? Wait until step 1 finishes.

  • Page 362: Calibration:protected:save

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :CALibration:PROTected:SAVE This command saves the calibration to nonvolatile memory after the calibration procedure has been completed. Affected by Where saved Default value Type Command only Not applicable Nonvolatile memory Not applicable...

  • Page 363: Calibration:protected:state

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :CALibration:PROTected:STATe This command enables or disables calibration procedures when performing these procedures over the remote interface. Type Affected by Where saved Default value Command and query Instrument reset Not saved 0 (OFF)

  • Page 364: Digital Subsystem

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Digital subsystem The commands in the DIGital subsystem control the digital I/O lines. :DIGital:LINE<n>:FUNCtion This command sets the digital I/O pin to be a digital line and sets the pin to be input or output. Type Affected by Where saved...

  • Page 365: Digital:line:Manual:input:data

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :DIGital:LINE<n>:MANual:INPut:DATA? This command reads the data from manual input to the digital I/O pin. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage...

  • Page 366: Display Subsystem

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual DISPlay subsystem This subsystem contains commands that control the front-panel display. :DISPlay:BRIGhtness This command sets and queries the brightness of the front-panel display. Type Affected by Where saved Default value Command and query...

  • Page 367: Display:clear

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :DISPlay:CLEar This command removes user-defined text messages from the OUTPUT view screen. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage :DISPlay:CLEar [<channel>]...

  • Page 368: Display:user:text[:Data]

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :DISPlay:USER:TEXT[:DATA] This command defines the text that is displayed on the front-panel OUTPUT view screen. Type Affected by Where saved Default value Command only Power cycle Not applicable Not applicable Usage...

  • Page 369: Initiate Subsystem

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference INITiate subsystem The commands in the INITiate subsystem control the trigger model. :INITiate[n]:CONTinuous This command enables and disables continuous triggering. Type Affected by Where saved Default value Command and query Recall settings...

  • Page 370: Initiate[N][:Immediate]

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :INITiate[n][:IMMediate] This command starts the trigger model. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage :INITiate[n][:IMMediate] Channel number: For single-channel instruments, the value is 1 Also see Trigger model (on page 3-30)

  • Page 371: Mmemory:save:setup

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example :MMEMory:LOAD:SETup "mysetup" Recall the setup named mysetup in the external USB flash drive to the instrument. Also see :MMEMory:SAVE:SETup (on page 7-107) *RCL (on page 7-6) *SAV (on page 7-7) :MMEMory:SAVE:SETup...

  • Page 372: Output Subsystem

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual OUTPut subsystem The output subsystem provides information and settings that control the source output. :OUTPut:DELay:FALLing This command specifies a delay that the instrument waits before turning off the specified output. Type Affected by Where saved...

  • Page 373: Output:delay:rising

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :OUTPut:DELay:RISing This command specifies the delay time that the instrument waits before turning on the specified output. Type Affected by Where saved Default value Command and query Recall settings Save settings Instrument reset...

  • Page 374: Output:delay:state

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :OUTPut:DELay:STATe This command enables and disables the delay time that the instrument waits before enabling and disabling the specified output. Type Affected by Where saved Default value Command and query Recall settings...

  • Page 375: Output:protection:clear

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :OUTPut:PROTection:CLEar This command clears the overvoltage, overcurrent, overtemperature, or reverse fault status. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage :OUTPut:PROTection:CLEar...

  • Page 376: Output:protection:tripped?[]

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :OUTPut:PROTection:TRIPped?[<channel>] This command queries whether overvoltage, overcurrent, overtemperature, or reverse fault protection has been tripped. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage...
  • Page 377 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :OUTPut[:STATe] This command enables or disables the source output. Type Affected by Where saved Default value Command and query Recall settings Save settings 0 (OFF) Instrument reset Power cycle Usage...

  • Page 378: Sense[N]:Function

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual SENSe subsystem The SENSe subsystem commands configure and control the measurement functions of the 2281S. Many of these commands are set for a specific function (concurrent, current, or voltage). For example, you can program a range setting for each function.

  • Page 379: Sense[N]::Average:count

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :SENSe[n]:<function>:AVERage:COUNt This command sets the number of measurements that are averaged when filtering is enabled for the specified function. Type Affected by Where saved Default value Command and query Recall settings Save settings...

  • Page 380: Sense[N]::Average[:State]

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :SENSe[n]:<function>:AVERage[:STATe] This command enables or disables the averaging filter for measurements of the selected function. Type Affected by Where saved Default value Command and query Recall settings Save settings 1 (ON)

  • Page 381: Sense[N]::Average:tcontrol

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :SENSe[n]:<function>:AVERage:TCONtrol This command sets the type of averaging filter that is used for measurements for the selected function when the measurement filter is enabled. Type Affected by Where saved Default value...

  • Page 382: Sense[N]::Average:window

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :SENSe[n]:<function>:AVERage:WINDow This command specifies a filter window to control filter threshold. Type Affected by Where saved Default value Command and query Recall settings Save settings Instrument reset Power cycle Usage...

  • Page 383: Sense[N]::Digits

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :SENSe[n]:<function>:DIGits This command determines the number of digits that are displayed for measurements on the front panel. Type Affected by Where saved Default value Command and query Recall settings Save settings Instrument reset...

  • Page 384: Sense[N]::Nplcycles

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :SENSe[n]:<function>:NPLCycles This command sets the time that the input signal is measured for measurements of the selected function. Type Affected by Where saved Default value Command and query Recall settings Save settings...

  • Page 385: Sense[N]::Range

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :SENSe[n]:<function>:RANGe This command sets the measurement range for measurements of the selected function. Type Affected by Where saved Default value Command and query Power cycle Save settings Concurrent: 10 mA Current: 10 mA...

  • Page 386: Sense[N]::Range:auto

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual For example, for current measurements, if you expect a reading of approximately 50 mA, set <range> to 0.05 (or 50e-3) to select the 100 mA range. For concurrent measurements, range only applies to current measurement.

  • Page 387: Sense[N]::Reference

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example :SENS:CURR:RANG:AUTO ON Set the range to be selected automatically for current measurements. Also see :SENSe[n]:<function>:RANGe (on page 7-121) :SENSe[n]:<function>:REFerence This command specifies the relative offset value for the measurement. Type Affected by Where saved...

  • Page 388: Sense[N]::Reference:acquire

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :SENSe[n]:<function>:REFerence:ACQuire This command acquires a measurement and stores it as the relative offset value. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage...

  • Page 389: Sense[N]::Reference:state

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :SENSe[n]:<function>:REFerence:STATe This command enables or disables a relative offset value. Type Affected by Where saved Default value Command and query Recall settings Save settings 0 (OFF) Instrument reset Power cycle Usage...

  • Page 390: Sense[N]::Resolution

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :SENSe[n]:<function>:RESolution This command sets the measurement resolution for the selected measurement function. Type Affected by Where saved Default value Command only Recall settings Save settings Instrument reset Power cycle Usage...

  • Page 391: Source Subsystem

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference SOURce subsystem The commands in the SOURce subsystem configure and control the current source and voltage source. [:SOURce[n]]:DELay This command sets the source delay. Type Affected by Where saved Default value...

  • Page 392: [:Source[N]]:Delay:state

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual [:SOURce[n]]:DELay:STATe This command enables or disables the delay that occurs when the source is turned on. Type Affected by Where saved Default value Command and query Recall settings Save settings 1 (ON)

  • Page 393: [:Source[N]]::Protection[:Level]

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference [:SOURce[n]]:<function>:PROTection[:LEVel] This command sets the overvoltage protection setting of the source output. Type Affected by Where saved Default value Command and query Recall settings Save settings Voltage: 21 V Instrument reset Current: 6.1 A...

  • Page 394: [:Source[N]]:[:Level][:Immediate][:Amplitude]

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual [:SOURce[n]]:<function>[:LEVel][:IMMediate][:AMPLitude] This command sets the source amplitude for voltage or current. Type Affected by Where saved Default value Command and query Recall settings Save settings Voltage: 0 V Instrument reset Current: 0.1 A...

  • Page 395: [:Source[N]]:Voltage:limit[:Amplitude]

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference [:SOURce[n]]:VOLTage:LIMit[:AMPLitude] This command selects the limit of voltage source. Type Affected by Where saved Default value Command and query Recall settings Save settings 20 V Instrument reset Power cycle Usage...

  • Page 396: [:Source[N]]:Voltage:slew:rising

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual [:SOURce[n]]:VOLTage:SLEW:RISing This command specifies and queries the rising rate for the voltage source. Type Affected by Where saved Default value Command and query Recall settings Save settings 100 V/s Instrument reset...

  • Page 397: [:Source[N]]:Voltage:slew:falling

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference [:SOURce[n]]:VOLTage:SLEW:FALLing This command specifies and queries the falling rate for the voltage source. Type Affected by Where saved Default value Command and query Recall settings Save settings 100 V/s Instrument reset...

  • Page 398: [:Source[N]]:List:

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual [:SOURce[n]]:LIST<listNumber>:<element> This command allows you to set up and query a list of custom values for a specified list. Type Affected by Where saved Default value Command only Instrument reset Nonvolatile memory...

  • Page 399: [:Source[N]]:List::Append

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example :LIST1:CURR "1,1,1" Set up list 1 with the following 6 points: :LIST1:VOLT "5,10,15" Point 1: 1 A, 5 V, 2 s :LIST1:DWEL "2,2,2" Point 2: 1 A, 10 V, 2 s :LIST1:CURR:APPE "2,2,2"...

  • Page 400: [:Source[N]]:List::Points

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Example :LIST1:CURR "1,1,1" Set up list 1 with the following 6 points: :LIST1:VOLT "5,10,15" Point 1: 1 A, 5 V, 2 s :LIST1:DWEL "2,2,2" Point 2: 1 A, 10 V, 2 s :LIST1:CURR:APPE "2,2,2"...

  • Page 401: [:Source[N]]:List:end:zero

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference [:SOURce[n]]:LIST:END:ZERO This command specifies the source values when the instrument is stopping a list. Type Affected by Where saved Default value Command and query Recall settings Save settings 0 (OFF) Instrument reset...

  • Page 402: [:Source[N]]:List:load:usb

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Example SOUR:LIST:HTIM time The hold time for list running is set as dwell time. SOUR:LIST:HTIM? Also see :TRIGger[:SEQuence[n]]:SAMPle:COUNt (on page 7-199) [:SOURce[n]]:LIST<listNumber>:<element> (on page 7-134) [:SOURce[n]]:LIST:LOAD:USB This command imports a list from USB flash drive to the instrument and save it in the specified location specified.

  • Page 403: [:Source[N]]:List:mcomplete

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference [:SOURce[n]]:LIST:MCOMPlete This command specifies the time when the instrument generates the measure complete signal with list enabled. Type Affected by Where saved Default value Command and query Recall settings Saved settings Instrument reset...

  • Page 404: [:Source[N]]:List:rcl

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Example :LIST:MCOMP STEP After each list step, the instrument generates a measure complete pulse. Also see Digital I/O (on page 3-22) [:SOURce[n]]:LIST:RCL This command recalls a specific list. Type Affected by Where saved...
  • Page 405 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example 2: Sweep list with BUS trigger (hold time type: POINt) *RST Reset the instrument and stop the trigger model Define list :LIST1:VOLT "1, 2, 3, 4, 5" Program voltage list 1 with 5 points :LIST1:CURR "0.5, 1, 1.5, 2, 2.5"...
  • Page 406 Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual You must allow the currently running list to finish before you run a new one. If you try to run a new one anyway, the command will be ignored. Example 4: Step list with BUS trigger (hold time type: POINt) *RST Reset the instrument and stop the trigger model...

  • Page 407: [:Source[N]]:List:save:internal

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference [:SOURce[n]]:LIST:SAVE:INTernal This command stores the specified list to nonvolatile memory. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage [:SOURce[n]]:LIST:SAVE:INTernal <listNumber>...

  • Page 408: [:Source[N]]:List:save:usb

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual [:SOURce[n]]:LIST:SAVE:USB This command saves the specified list to the USB flash drive. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage [:SOURce[n]]:LIST:SAVE:USB <listNumber>,<fileName>...

  • Page 409: [:Source[N]]:List:state

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference [:SOURce[n]]:LIST:STATe This command enables or disables the list mode. Type Affected by Where saved Default value Command and query Recall settings Save settings 0 (OFF) Instrument reset Power cycle Usage...
  • Page 410 Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Example 2: Sweep list with BUS trigger (hold time type: POINt) *RST Reset the instrument and stop the trigger model Define list :LIST1:VOLT "1, 2, 3, 4, 5" Program voltage list 1 with 5 points :LIST1:CURR "0.5, 1, 1.5, 2, 2.5"...
  • Page 411 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference You must allow the currently running list to finish before you run a new one. If you try to run a new one anyway, the command will be ignored. Example 4: Step list with BUS trigger (hold time type: POINt) *RST Reset the instrument and stop the trigger model...

  • Page 412: Status Subsystem

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual STATus subsystem The STATus subsystem controls the status registers of the 2281S. For additional information on the status model, see Status model (on page D-1). :STATus:MEASurement[:EVENt]? This command reads and clears the Measurement Event Register of the status model.

  • Page 413: Status:measurement:instrument[:Event]

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example :STAT:MEAS:ENAB #b0010000000000000 Sets the ISUM bit of the measurement status enable register using a binary value. You could also send the decimal value 8192 or the hexadecimal value: #h2000. Also see Measurement Event Register (on page D-17)

  • Page 414: Status:measurement:instrument:isummary[:Event]

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual When sending binary values, preface <n> with #b. When sending hexadecimal values, preface <n> with #h. No preface is needed when sending decimal values. Example :STAT:MEAS:INST:ENAB #b0000000000000010 Sets the bit 1 of the Measurement Instrument Enable Register using a...

  • Page 415: Status:measurement:instrument:isummary:enable

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :STATus:MEASurement:INSTrument:ISUMmary:ENABle This command sets or reads the contents of the Measurement Instrument Summary Enable Register of the status model. Type Affected by Where saved Default value Command and query Power cycle Not applicable...

  • Page 416: Status:measurement:instrument:isummary:condition

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :STATus:MEASurement:INSTrument:ISUMmary:CONDition? This command reads the Measurement Instrument Summary Condition Register of the status model. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage...

  • Page 417: Status:operation:enable

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :STATus:OPERation:ENABle This command sets or reads the contents of the Operation Event Enable Register of the status model. Type Affected by Where saved Default value Command and query Power cycle Not applicable...

  • Page 418: Status:operation:instrument:enable

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :STATus:OPERation:INSTrument:ENABle This command sets or reads the contents of the Operation Instrument Enable Register of the status model. Type Affected by Where saved Default value Command and query Power cycle Not applicable...

  • Page 419: Status:operation:instrument:isummary:enable

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example :STAT:OPER:INST:ISUM? Returns the contents of the Operation Instrument Summary Event Register of the status model. Also see Operation Instrument Summary Event Register (on page D-13) :STATus:OPERation:INSTrument:ISUMmary:ENABle This command sets or reads the contents of the Operation Instrument Summary Enable Register of the status model.

  • Page 420: Status:operation:instrument:isummary:condition

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :STATus:OPERation:INSTrument:ISUMmary:CONDition? This command reads the Operation Instrument Summary Condition Register of the status model. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage...

  • Page 421: Status:questionable[:Event]

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example :STAT:PRES Reset all the enable registers to 0. Also see None :STATus:QUEStionable[:EVENt]? This command reads the Questionable Event Register. Type Affected by Where saved Default value Query only Not applicable...

  • Page 422: Status:questionable:enable

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :STATus:QUEStionable:ENABle This command sets or reads the contents of the Questionable Event Enable Register of the status model. Type Affected by Where saved Default value Command and query Power cycle Not applicable...

  • Page 423: Status:questionable:instrument:enable

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :STATus:QUEStionable:INSTrument:ENABle This command sets or reads the contents of the Questionable Instrument Event Enable Register of the status model. Type Affected by Where saved Default value Command and query Power cycle Not applicable...

  • Page 424: Status:questionable:instrument:isummary[:Event]

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :STATus:QUEStionable:INSTrument:ISUMmary[:EVENt]? This command reads the Operation Instrument Summary Event Register of the status model. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage...

  • Page 425: Status:questionable:instrument:isummary:condition

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example :STAT:QUES:INST:ISUM:ENAB #b0000000000001010 Sets the overvoltage protection (OVP) and constant voltage (CV) bits of the Questionable Instrument Summary Enable Register using a binary value. You could also send the decimal value 10 or the hexadecimal value #hA.

  • Page 426: System:azero[N][:State]

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual SYSTem subsystem This subsystem contains commands that affect the overall operation of the instrument, such as autozero, beeper, communications, event logs, and time. :SYSTem:AZERo[n][:STATe] This command enables and disables the autozero. Type Affected by Where saved...

  • Page 427: System:beeper:error[:State]

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :SYSTem:BEEPer:ERRor[:STATe] This command allows you to turn the beeper on or off. Type Affected by Where saved Default value Command and query Recall settings Save settings 1 (ON) Instrument reset Power cycle...

  • Page 428: System:communication:lan:configure

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Before you use this command to get control of the instrument, make sure this interface is unlocked. If the interface is locked, sending SYST:COMM:ABOR causes error 511, "Communication not permitted: This interface is locked, send SYSTem:PASSword:UNLock with a password to unlock it."...

  • Page 429: System:communication:lan:macaddress

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference The query form of the command returns the present settings in the order shown here: AUTO or MANual,<IPaddress>,<NETmask>,<GATeway> Example :SYST:COMM:LAN:CONF MAN,"192.168.0.1","255.255.240.0","192.168.0.3" :SYST:COMM:LAN:CONF? Set the IP address to be set manually, with the IP address set to 192.168.0.1, the subnet mask to 255.255.240.0, and the gateway address to 192.168.0.3.

  • Page 430: System:date

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :SYSTem:DATE This command sets the calendar of the instrument. Type Affected by Where saved Default value Command and query Not applicable Nonvolatile memory See Details Usage :SYSTem:DATE <year>, <month>, <day>...

  • Page 431: System:error:clear

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :SYSTem:ERRor:CLEar This command clears the error queue. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Query :SYSTem:ERRor:CLEar Details This function removes all messages from the error queue.

  • Page 432: System:error:count

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :SYSTem:ERRor:COUNt? This command returns the number of errors in the error queue. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage :SYSTem:ERRor:COUNt?

  • Page 433: System:gpib:address

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :SYSTem:GPIB:ADDRess This command sets the GPIB address. Type Affected by Where saved Default value Command and query Not applicable Nonvolatile memory Usage :SYSTem:GPIB:ADDRess <n> :SYSTem:GPIB:ADDRess? The GPIB address of the instrument (1 to 30) Details The address can be set to any address value from 1 to 30.

  • Page 434: System:kclick

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :SYSTem:KCLick This command allows you to enable or disable the key click sound. Type Affected by Where saved Default value Command and query Recall settings Save settings 0 (OFF) Instrument reset...

  • Page 435: System:lfrequency

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference Example :SYST:LOC Returns to local mode and you can control the instrument from the front panel. Also see :SYSTem:RWLock (on page 7-176) :SYSTem:LFRequency? This query returns the line frequency that was automatically detected when the instrument was turned on. Type Affected by Where saved...

  • Page 436: System:password:mode

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Example :SYST:PASS:LOCK "admin" Disable the current interface Also see :SYSTem:PASSword:MODE (on page 7-172) :SYSTem:PASSword:NEW (on page 7-173) :SYSTem:PASSword:UNLock (on page 7-174) :SYSTem:PASSword:MODE This command sets the protection mode for the remote connection. Type Affected by Where saved...

  • Page 437: System:password:new

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :SYSTem:PASSword:NEW This command sets a new password for the remote connection. Type Affected by Where saved Default value Command only Not applicable Nonvolatile memory admin Usage :SYSTem:PASSword:NEW <string1>,<string2>...

  • Page 438: System:password:unlock

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :SYSTem:PASSword:UNLock This command enables a remote interface. Type Affected by Where saved Default value Command only Not applicable Not applicable admin Usage :SYSTem:PASSword:UNLock <password> <password> The password for remote mode Details When a remote interface is locked, sending this command with the correct password will release it.

  • Page 439: System:preset

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :SYSTem:PRESet This command returns the instrument to the factory default conditions and erases all user data stored in nonvolatile memory. Type Affected by Where saved Default value Command only Not applicable...

  • Page 440: System:rwlock

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :SYSTem:RWLock This command locks out front-panel controls. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage :SYSTem:RWLock Details When this command is sent, all of the front-panel keys are disabled.

  • Page 441: System:version

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :SYSTem:VERSion? This command queries the present SCPI standard version. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage :SYSTem:VERSion? Details This query command returns the SCPI standard version.

  • Page 442: Data[N]:Clear:auto

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :DATA[n]:CLEar:AUTO This command enables or disables the autoclear feature for the buffer. Type Affected by Where saved Default value Command and query Power cycle Not applicable 1 (ON) Usage :DATA[n]:CLEar:AUTO <state>...
  • Page 443 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference However, once the buffer has been fully filled, you can retrieve all the stored readings again by sending this command. For example, if DATA:DATA? "READ, SOURce" is sent, the subsequent DATA:DATA? "MODE"...

  • Page 444: Data[N]:Data:selected

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Example :DATA:DATA? "READ,SOUR,REL" Return the measurement value, source value, and the relative time. Output: +1.000000E+00,+1.779709E-03, +0.000000E+00,+1.000000E+00, +1.735228E-03,+6.100000E-02 Also see None :DATA[n]:DATA:SELected? This query command returns specified data elements in the buffer. Type Affected by Where saved...
  • Page 445 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference For large buffers, you can get the data in 100-point increments. For example, if the data point is 250, DATA:DATA:SELected 1,100,"READ, SOURce" command will return the first 100 readings and source values from the buffer.

  • Page 446: Data[N]:Feed

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :DATA[n]:FEED This command selects the source of readings. Type Affected by Where saved Default value Command and query Recall settings Save settings SENS Instrument reset Power cycle Usage :DATA[n]:FEED <name>...

  • Page 447: Data[N]:Feed:control

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :DATA[n]:FEED:CONTrol This command determines if a reading buffer is filled continuously or is filled once and stops. Type Affected by Where saved Default value Command and query Recall settings Save settings Instrument reset...
  • Page 448 Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :DATA[n]:POINts This command contains the number of readings a buffer can store. Type Affected by Where saved Default value Command and query Recall settings Save settings Instrument reset Power cycle Usage...

  • Page 449: Data[N]:Save

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :DATA[n]:SAVE This command saves data from the specified reading buffer to a USB flash drive. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage...

  • Page 450: Trace[N]:Clear

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :TRACe[n]:CLEar This command clears all readings in the buffer. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage :TRACe[n]:CLEar Channel number: For single-channel instruments, the value is 1 Example...

  • Page 451: Trace[N]:Data

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :TRACe[n]:DATA? This query command returns all the readings from the buffer. Type Affected by Where saved Default value Query only Recall settings Not applicable Not applicable Instrument reset Power cycle Usage...

  • Page 452: Trace[N]:Data:selected

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Option Description Example RSTamp 12:23:32.2349 The relative time when the data point was measured. RNUMber 0001 The reading number indicates the point index in the trace buffer.
  • Page 453 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference When specifying buffer elements, you can:  Specify buffer elements in any order.  Repeat elements as long as the number of elements in the list is less than 10. ...

  • Page 454: Trace[N]:Feed

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :TRACe[n]:FEED This command selects the source of readings. Type Affected by Where saved Default value Command and query Recall settings Save settings SENS Instrument reset Power cycle Usage :TRACe[n]:FEED <name>...

  • Page 455: Trace[N]:Feed:control

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :TRACe[n]:FEED:CONTrol This command determines if a reading buffer is filled continuously or is filled once and stops. Type Affected by Where saved Default value Command and query Recall settings Save settings Instrument reset...

  • Page 456: Trace[N]:Points:actual

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :TRACe[n]:POINts This command contains the number of readings a buffer can store. Type Affected by Where saved Default value Command and query Recall settings Save settings Instrument reset Power cycle Usage...

  • Page 457: Trace[N]:Save

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :TRACe[n]:SAVE This command saves data from the specified reading buffer to a USB flash drive. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage...

  • Page 458: Trace[N]:Trigger:current:direction

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :TRACe[n]:TRIGger:CURRent:DIRection This command specifies whether the current rises above or falls below a specified level when the level trigger is activated. Type Affected by Where saved Default value Command and query Power cycle...

  • Page 459: Trace[N]:Trigger:current:state

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :TRACe[n]:TRIGger:CURRent:STATe This command determines whether the current level trigger function is enabled. Type Affected by Where saved Default value Command and query Power cycle Not applicable 0 (OFF) Usage :TRACe[n]:TRIGger:CURRent:STATe <state>...

  • Page 460: Trace[N]:Trigger:offset

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :TRACe[n]:TRIGger:OFFSet This command defines the number of points at which the instrument begins to log data in the buffer. Type Affected by Where saved Default value Command and query Power cycle Not applicable...

  • Page 461: Trace[N]:Trigger:voltage[:Level]

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :TRACe[n]:TRIGger:VOLTage[:LEVel] This command configures the voltage threshold for the level trigger. Type Affected by Where saved Default value Command and query Power cycle Not applicable Usage :TRACe[n]:TRIGger:VOLTage[:LEVel] <voltageThreshold>...

  • Page 462: Trigger Subsystem

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual TRIGger subsystem The commands in this subsystem configure and control the trigger model for trigger layer. :TRIGger[:SEQuence[n]]:COUNt This command sets the number of times to repeat the trigger event. Type Affected by Where saved...

  • Page 463: Trigger[:Sequence[N]]:Sample:count

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 7: SCPI command reference :TRIGger[:SEQuence[n]]:SAMPle:COUNt This command sets the number of measurement per trigger event. Type Affected by Where saved Default value Command and query Recall settings Save settings Instrument reset Power cycle Usage...

  • Page 464: Trigger[:Sequence[N]]:Source

    Section 7: SCPI command reference Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual :TRIGger[:SEQuence[n]]:SOURce This command selects the control source for trigger layer. Type Affected by Where saved Default value Command and query Recall settings Save settings Instrument reset Power cycle Usage :TRIGger[:SEQuence[n]]:SOURce <source>...
  • Page 465 Section 8 Troubleshooting guide In this section: Introduction ................8-1 Contacting support ..............8-1 What to do if the power supply does not turn on ...... 8-2 LAN troubleshooting suggestions ..........8-3 Error summary ................. 8-3 Introduction This section includes troubleshooting information on the Keithley Instruments Model 2281S-20-6 DC Power Supply and Battery Simulator, including a complete listing of error messages and troubleshooting suggestions.

  • Page 466: Troubleshooting Guide

    Section 8: Troubleshooting guide Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual What to do if the power supply does not turn on To solve problems you might encounter when turning on the instrument, follow these steps: 1. Verify that there is AC power to the power supply. Check that the AC power cord is firmly plugged into the power connector on the rear panel of the power supply.

  • Page 467: Lan Troubleshooting Suggestions

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 8: Troubleshooting guide LAN troubleshooting suggestions If you are unable to connect to the instrument's web interface, check the following items: Verify that the network cable is in the correct port on the computer. The LAN port of a laptop may be disabled when the laptop is in a docking station.
  • Page 468 Section 8: Troubleshooting guide Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Error code Error message -401 Power on -400 Query event -363 Input buffer overrun -362 Framing error in program message -361 Parity error in program message -360 Communication error -350...
  • Page 469 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 8: Troubleshooting guide Error code Error message -243 Hardware I/O device error -242 Hardware configuration error -241 Hardware missing -240 Hardware error -230 Data corrupt or stale -225 Out of memory -224 Illegal parameter value -223...
  • Page 470 Section 8: Troubleshooting guide Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Error code Error message -148 Character data not allowed -144 Character data too long -141 Invalid character data -140 Character data error -138 Suffix not allowed -134 Suffix too long -131...
  • Page 471 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 8: Troubleshooting guide Error code Error message Calibration data lost Busy on current step, wait until this step is completed Not permitted with cal unlocked Step1 Kmath error Step1 V-DAC zero DMM reading out of range Step1 V-ADC zero collected data error Step2 V-DAC full scale DMM reading out of range Step2 V-ADC full scale collected data error...
  • Page 472 Section 8: Troubleshooting guide Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Error code Error message Load list from USB flash drive failed Load list from internal memory failed Change Sense Function to V+I (CONCurrent) before running a list Not permitted with list enabled Protection errors Error Message...
  • Page 473 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Section 8: Troubleshooting guide Error code Error message Password is too long Invalid character in password Lines 1/3 don't support function DIGIN/DIGOUT for single channel instrument Lines 2/4 to 6 don't support function AUTO for single channel instrument Parameter error Not supported in this mode Line 1 will be fixed to ATUO when arm source is External...

  • Page 474: Next Steps

    Section 9 Next steps In this section: Additional 2281S information ........... 9-1 Additional 2281S information For additional information about the 2281S, refer to: The Keithley Instruments website (tek.com/keithley) contains the most up-to-date information. From the website, you can access:  The product documentation ...

  • Page 475: Maintenance

    Appendix A Maintenance In this appendix: Introduction ................A-1 Line fuse replacement .............. A-1 Upgrading the firmware ............A-2 Perform DIN VDE 701 test ............A-4 Cleaning the front-panel display ..........A-4 Introduction The information in this section describes routine maintenance of the instrument that can be performed by the operator.

  • Page 476: Upgrading The Firmware

    Appendix A: Maintenance Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Perform the following steps to replace the line fuse: 1. Power off the instrument. 2. Remove the line cord. 3. Locate the fuse drawer, which is next to the AC receptacle as shown in the graphic below. Figure 132: Line fuse 4.

  • Page 477: From The Front Panel

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix A: Maintenance To locate the upgrade files: 1. Go to the Product Support web page (tek.com/product-support). 2. Next to Enter model, type 2281S, and select GO. 3. Select the Software tab. 4.

  • Page 478: Perform Din Vde 701 Test

    Appendix A: Maintenance Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual 10. Select the type of upgrade you want to perform:  To upgrade to a newer version of firmware: Select New and press the ENTER key.  To return to a previous version of firmware: Select Previous and press the ENTER key.

  • Page 479: Verification

    Appendix B Verification In this appendix: Overview .................. B-1 Test record ................B-1 Performance verification procedures ........B-14 Overview This section contains performance verification procedures. Additional test equipment is required to complete the verification procedures. These procedures cover the 2281S. Please ignore procedures that do not apply to the specific model you are testing.

  • Page 480: Dc Voltage Setting Accuracy With Remote Sense

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Test Passed Failed DC voltage setting accuracy with remote sense DC voltage accuracy without remote sense DC voltage readback accuracy DC voltage line regulation DC voltage load regulation Sink current capability Sink current readback accuracy (1 A) Sink current readback accuracy (100 mA)
  • Page 481 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification DC voltage setting accuracy with remote sense Model number Test Min (V) Max (V) Measured voltage (V) current (A) voltage (V) 0% test voltage 2281S -0.003 0.003 25% test voltage 2281S 4.996...

  • Page 482: Dc Voltage Setting Accuracy Without Remote Sense

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual DC voltage setting accuracy without remote sense Model number Test current Min (V) Max (V) Measured voltage (V) voltage (V) 0% test voltage 2281S -0.003 0.003 25% test voltage 2281S 4.9945 5.0055...

  • Page 483: Dc Voltage Readback Accuracy With Remote Sense

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification DC voltage readback accuracy with remote sense Model number Test Measured Absolute Maximum voltage (V) current (A) voltage (V) readback (V) difference (mV) difference (mV) 0% test voltage 2281S 25% test voltage 2281S...

  • Page 484: Dc Voltage Readback Accuracy Without Remote Sense

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual DC voltage readback accuracy without remote sense Model Test Measured Absolute Maximum number voltage (V) current (A) voltage (V) readback (V) difference (mV) difference (mV) 0% test voltage 2281S 25% test voltage 2281S...

  • Page 485: Dc Overvoltage Protection

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification DC overvoltage protection Model number OVP setting Min (V) Max (V) Measured voltage (V) voltage (V) 10% OVP setting 2281S 1.745 2.255 25% OVP setting 2281S 4.7375 5.2625 50% OVP setting 2281S...

  • Page 486: Sink Current Readback Accuracy (1 A Range

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Sink current readback accuracy (1 A range) Model Test current Measured DUT readback Absolute Maximum Number (mA) current (mA) (mA) difference difference (mA) (mA) 10% test current (1 A) 2281S 0.29 50% test current (1 A)

  • Page 487: Sink Current Readback Accuracy (100 Ma Range

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification Sink current readback accuracy (100 mA range) Model Test current Measured DUT readback Absolute Maximum number (mA) current (mA) difference difference (mA) (mA) (µA) 10% test current (100 mA) 2281S 50% test current (100 mA) 2281S...

  • Page 488: Dc Current Accuracy

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual DC current accuracy Model number DUT voltage Test current Min (A) Max (A) Measured current (A) 0% test current 2281S -0.005 0.005 25% test current 2281S 1.494925 1.50575 50% test current 2281S...

  • Page 489: Dc Current Readback Accuracy (10 A Range

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification DC current readback accuracy (10 A range) Model Test current Measured DUT readback Absolute Maximum number current (A) difference (mA) difference (mA) 0% test current 2281S 0.25 10% test current 2281S 0.55...

  • Page 490: Dc Current Readback Accuracy (10 Ma Range

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual DC current readback accuracy (10 mA range) Model number Test Measured Absolute Maximum current (mA) difference current (mA) readback (mA) difference ( A) (mA) 0% test current (10 mA) 2281S 10% test current (10 mA) 2281S...

  • Page 491: Dc Current Line Regulation

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification DC current line regulation Model Min (A) Nom (A) Max (A) Nom - Max - Largest Test number (mA) value voltage current (mA) (mA) (mA) 2281S 0.850 DC current load regulation Model Min test...

  • Page 492: Voltage Noise At 20 Mhz

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Voltage noise at 20 MHz Model number DUT current (A) DUT voltage (V) Max (mV) Measured voltage (mV) 20 MHz voltage ripple RMS 2281S 20 MHz voltage ripple PKPK 2281S Current noise at 20 MHz Model number...

  • Page 493: Performance Verification Procedures

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification Performance verification procedures Use the procedures in this topic to verify the performance of the 2281S instruments. Performance verification conditions The following conditions must be met before performing these procedures: The device under test (DUT) and all test equipment must have been operating continuously for 20 minutes in an environment that meets the operating range specifications for temperature and humidity.

  • Page 494: Required Equipment

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Required equipment These procedures use external equipment to directly check warranted characteristics. The following table lists the required equipment. Equipment Required specifications Recommended model Connectors Connect wire assemblies and test resistors.
  • Page 495 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification 3. Set up the equipment, as shown in the following figure. Figure 133: DC voltage accuracy with remote sense test setup To ensure accurate measurements, it is important that a significant amount of current does not flow through the sense leads.
  • Page 496 Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual 9. Turn the DUT output on. 10. Enter the voltmeter reading in the DC voltage setting accuracy with remote sense and the DC voltage readback accuracy with remote sense tables. 11.

  • Page 497: Check Dc Voltage Setting Accuracy Without Remote Sense

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification Check DC voltage setting accuracy without remote sense Equipment required AC power source High-current 18 AWG wire Electronic load Low-current 22 AWG wire DC voltmeter Set up the equipment, as shown in the following figure. Figure 135: Voltage accuracy and protection test setup Ensure the warm-up criteria have been met, as described in the Performance verification conditions.
  • Page 498 Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Figure 136: Electronic load and voltmeter connections To check DC voltage setting accuracy without remote sense: 1. Set the voltmeter as follows:  Set to measure DC volts. ...

  • Page 499: Check Dc Voltage Readback Accuracy Without Remote Sense

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification Check DC voltage readback accuracy without remote sense Equipment required AC power source High current 18 AWG wire DC voltmeter Low current 22 AWG wire Set up the equipment as shown in the following figure. Figure 137: Voltage readback accuracy without remote sense test setup Make sure the warm-up criteria have been met, as described in the Performance verification conditions.
  • Page 500 Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual To check DC voltage readback accuracy without remote sense: 1. Set the voltmeter as follows:  Set to measure DC voltage.  Set the current range to autorange. ...

  • Page 501: Check Dc Voltage Line Regulation

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification Check DC voltage line regulation Set up the equipment, as shown in the following figure. Figure 138: Voltage line regulation test setup To check DC voltage line regulation: 1.
  • Page 502 Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual 2. Set the voltmeter as follows: a. Set to measure DC volts. b. Set the current range to autorange. c. Verify that the Math mx+b function is disabled (shift DCV), assuring that volts are being read. 3.

  • Page 503: Check Dc Voltage Load Regulation

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification Check DC voltage load regulation This procedure uses the same test setup as the previous procedure (see Check DC voltage setting accuracy without remote sense (on page B-19)). Make sure the warm-up criteria have been met, as described in the Performance verification conditions.

  • Page 504: Check Dc Overvoltage Protection

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Check DC overvoltage protection This procedure uses the same test setup as the previous procedure (see Check DC voltage setting accuracy without remote sense (on page B-19)). Make sure the warm-up criteria have been met, as described in the Performance verification conditions.

  • Page 505: Check Sink Current Capability

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification Check sink current capability Equipment required AC power source High current 18 AWG wire High accuracy 0.05 Ω resistor Electronic load DC voltmeter Current shunt resistor cabling DC source Programmable DC power source, low noise, can work at constant current mode, output capability...

  • Page 506: Check Sink Current Readback Accuracy (1 A Range

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Check sink current readback accuracy (1 A range) Equipment required AC power source High current 18 AWG wire High accuracy 0.05 Ω shunt DC voltmeter Current shunt resistor cabling Set up the equipment as shown in the following figure.
  • Page 507 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification To check sink current readback accuracy (1 A range): 1. Set the voltmeter as follows: a. Set to measure DC volts. b. Set the current range to autorange. c.

  • Page 508: Check Sink Current Readback Accuracy (100 Ma And 10 Ma Ranges

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Check sink current readback accuracy (100 mA and 10 mA ranges) Equipment required AC power source High current 18 AWG wire 300 Ω load resistor High accuracy 0.05 Ω shunt and 5 Ω shunt DC voltmeter Current shunt resistor cabling Set up the equipment as shown in the following figure.
  • Page 509 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification To check sink current readback accuracy (100 mA and 10 mA ranges): 1. Set the voltmeter as follows:  Set to measure DC volts.  Set the current range to autorange. ...

  • Page 510: Check Dc Current Accuracy

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Check DC current accuracy Equipment required AC power source High current 18 AWG wire High accuracy 0.05 Ω resistor Electronic load DC voltmeter Current shunt resistor cabling Set up the equipment as shown in the following figure.
  • Page 511 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification To check DC current setting accuracy: 1. Set the voltmeter as follows: a. Set to measure DC volts. b. Set the current range to autorange. c. Calculate the amperes (instead of volts) by multiplying the voltmeter reading result by 20 (1/R Shunt 2.

  • Page 512: Check Dc Current Readback Accuracy (10 A And 1 A Ranges

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Check DC current readback accuracy (10 A and 1 A ranges) Equipment required AC power source High current 18 AWG wire High accuracy 0.05 Ω shunt DC voltmeter Current shunt resistor cabling The 2281S has the following ranges to verify: 10 A, 1 A, 100 mA, and 10 mA range.
  • Page 513 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification To check DC current readback accuracy (10 A and 1 A ranges): 1. Set the voltmeter as follows: Set to measure DC volts. Set the current range to autorange. Calculate the amperes (instead of volts) by multiplying the voltmeter reading result by 1/(R1), where R1 represents the high-accuracy 0.05 Ω...

  • Page 514: Check Dc Current Readback Accuracy (100 Ma And 10 Ma Ranges

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Check DC current readback accuracy (100 mA and 10 mA ranges) Equipment required AC power source High current 18 AWG wire 300 Ω load resistor High accuracy 0.05 Ω shunt and 5 Ω shunt DC voltmeter Current shunt resistor cabling The 2281S has the following ranges to verify: 10 A, 1 A, 100 mA, and 10 mA.
  • Page 515 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification To check DC current readback accuracy (100 mA and 10 mA ranges): 1. Set the voltmeter as follows: a. Set to measure DC volts. b. Set the current range to autorange. c.

  • Page 516: Check Dc Current Line Regulation

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Check DC current line regulation Set up the equipment as shown in the following figure. Figure 145: Current line regulation test setup To check DC current line regulation: 1.
  • Page 517 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification 2. Set the voltmeter as follows: a. Set to measure DC volts. b. Set the current range to auto range. c. Calculate the amperes (instead of volts) by multiplying the voltmeter reading result by 1/R. 3.

  • Page 518: Check Dc Current Load Regulation

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Check DC current load regulation This procedure uses the same test setup as the previous procedure (see Check DC current readback accuracy (10 A and 1 A ranges) (on page B-34)).

  • Page 519: Check Overcurrent Protection

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification Check overcurrent protection This procedure uses the same test setup as Check DC overvoltage protection (on page B-26). Make sure the warm-up criteria have been met, as described in the Performance verification conditions.

  • Page 520: Check Voltage Noise (20 Mhz

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Check voltage noise (20 MHz) Equipment required Oscilloscope High current 18 AWG wire Electronic load Coaxial cable (BNC M-M) BNC F-to-Banana cable To check voltage noise (20 MHz): 1.
  • Page 521 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix B: Verification Figure 146: 20 MHz voltage and current noise test setup 5. Set the oscilloscope as follows:  1 mV/division  1 MΩ input resistance  20 MHz bandwidth limit ...

  • Page 522: Check Current Noise (20 Mhz

    Appendix B: Verification Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Check current noise (20 MHz) Equipment required Oscilloscope High current 18 AWG wire Electronic Load Coaxial cable (BNC M-M) BNC F-to-Banana To check current noise (20 MHz): 1.

  • Page 523: Calibration And Adjustment

    Appendix C Calibration and adjustment In this appendix: Overview ................. C-1 Environmental conditions ............C-1 Calibration considerations ............C-2 Calibration connection ............. C-6 Front-panel calibration procedure .......... C-12 Remote calibration procedure ..........C-20 Change the calibration password .......... C-30 Calibration constants ............. C-31 Overview Use the procedures in this section to calibrate the Keithley Instruments 2281S DC Power Supply and Battery Simulator.

  • Page 524: Warmup Period

    Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Warmup period Allow the 2281S to warm up for at least one hour before performing calibration. If the instrument has been subjected to temperature extremes (those outside the ranges stated in (on page C-1)), allow extra time for the instrument’s internal temperature to Environmental conditions stabilize.

  • Page 525: Required Equipment

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix C: Calibration and adjustment Required equipment This section lists the required equipment you need for voltage and current calibration procedures. Alternate equipment may be used, as long as the equipment has specifications at least as good as those listed in the table.

  • Page 526: Characterization Shunts

    Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Characterization shunts Before performing calibration, you need to verify the value of the following shunts. Shunt value Tolerance Calibration use 0.05 Ω ± 0.0005 Ω High current calibration 5.05 Ω...
  • Page 527 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix C: Calibration and adjustment Step 2 To verify the 0.05 Ω precision shunt resistor, you need to measure two voltages: Voltage Description The total voltage across the two shunts total The voltage across the 0.05 Ω...

  • Page 528: Calibration Connection

    Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Figure 149: Measure the voltage across the 0.05 ohm shunt Calibration connection You can calibrate the instrument using the front panel or by remote commands using ethernet, GPIB, or USB interfaces.

  • Page 529: Voltage Calibration Connections

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix C: Calibration and adjustment Voltage calibration connections For voltage calibration, connect the digital multimeter (DMM) to the 2281S. For the DMM specifications, see Required equipment (on page C-3). Figure 150: Voltage calibration connections When you are using a binding post on the front panel to make a calibration connection, insert the jumper wires to short the output terminals and sense terminals on the rear panel.

  • Page 530: Current Calibration Connections

    Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Use the following steps to short the output terminals and sense terminals: Step Description Insert the jumper wires in the output mating connector. Connect the mating connector to the terminal on the back side of the 2281S. Slide the cable housing over the output mating connector and wires.
  • Page 531 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix C: Calibration and adjustment Figure 152: High-current calibration connection using an electronic load 077114601 / March 2019...
  • Page 532 Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Figure 153: Low-current calibration connection using a resistor C-10 077114601 / March 2019...

  • Page 533: Sink Current Calibration Connections

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix C: Calibration and adjustment Sink current calibration connections For sink-current calibration, the following equipment is required: Digital multimeter Precision shunt resistors Power supply You use 2281S as an electronic load or a resistor to perform sink-current calibration. You are required to change the shunt and load configuration for certain steps.

  • Page 534: Front-Panel Calibration Procedure

    Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Front-panel calibration procedure To perform calibration from the front panel: 1. Turn on the instrument and allow it to warm up for at least one hour before performing the calibration.

  • Page 535: Low-Current Calibration

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix C: Calibration and adjustment Step 2 1. Enter the measured result from the DMM. 2. After entering the data, the waiting window is displayed. You need to wait a few seconds for the internal measurements and calculations.
  • Page 536 Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual For 2281S, the expected values are shown in the following table. Steps Maximum voltage Minimum voltage 1.515e 0.00 V 1.515 V 0.02 V Step 3 1.

  • Page 537: High-Current Calibration

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix C: Calibration and adjustment High-current calibration Connect the instrument with the digital multimeter (DMM), precision shunt resistor, and electronic load (or resistor). For details, see Current calibration connections (on page C-8). Perform the following steps to finish the high-current calibration: Steps 5 through 8: Current calibration on the 1 A and 10 A ranges You must input the measured value from the DMM.

  • Page 538: Low-Sink Current Calibration

    Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Step 6 1. Before starting this calibration step, configure the shunt and load (electronic load or resistor load) as shown in the following table. Model Shunt Electronic load Resistor load...
  • Page 539 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix C: Calibration and adjustment For 2281S, the expected values are shown in the following table. Steps Maximum voltage Minimum voltage –9.09e 6.06e –0.2 V –1.515 V Step 9 1. Before starting this calibration step, configure the shunt and power supply as shown in the following table.

  • Page 540: High-Sink Current Calibration

    Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual High-sink current calibration Connect the instrument with the digital multimeter (DMM), precision shunt resistor, and electronic load (or resistor). For details, see Current calibration connections (on page C-8).

  • Page 541: Saving Calibration Constants From The Front Panel

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix C: Calibration and adjustment Step 12 1. Before starting this calibration step, configure the shunt and load (electronic load or resistor load) as shown in the following table. Model Shunt Power supply 5.05 Ω...

  • Page 542: Remote Calibration Procedure

    Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Remote calibration procedure Before performing a calibration by remote control, check the system date of the 2281S. This can be done by sending the following commands: :SYSTem:DATE? :SYSTem:TIME? If the date is incorrect, the date and time need to be modified using the following commands:...

  • Page 543: Remote Voltage Calibration

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix C: Calibration and adjustment Remote voltage calibration Connect the instrument to a digital multimeter (DMM). For details, see Voltage calibration connection (on page C-7). You must input the measured value from the DMM. The value should be within the expected range. A message will indicate if the DMM data entry was out of the expected range.

  • Page 544: Remote Low-Current Calibration

    Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual After each calibration step, the 2281S output is set to a safe low-voltage level, preventing inadvertent harm to the user, instrument, or load. Remote low-current calibration Connect the instrument with the digital multimeter (DMM), shunt, and electronic load (or resistor).

  • Page 545: Remote High-Current Calibration

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix C: Calibration and adjustment Step 4 1. Before calibration, configure the shunt and load (electronic load or resistor load), as shown in the following table. Model Shunt Electronic load Resistor load 5.05 Ω...
  • Page 546 Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual The 2281S has 200 W of constant output power. Make sure that cables, shunts, and loads are properly rated for the intended current. Incorrect shunt connections, such as using the 5.05 Ω shunt during step 5 and step 6, can cause damage.

  • Page 547: Remote Low-Sink Current Calibration

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix C: Calibration and adjustment Step 7 1. Before calibration, configure the shunt and load (electronic load or resistor load), as shown in the following table. Model Shunt Electronic load Resistor load 0.05 Ω...
  • Page 548 Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual For 2281S, the expected values are shown in the following table. Steps Maximum voltage Minimum voltage –9.09e 6.06e- –0.2 V –1.515 V Step 9 1. Before starting this calibration step, configure the shunt and power supply as shown in the following table.

  • Page 549: Remote High-Sink-Current Calibration

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix C: Calibration and adjustment Remote high-sink-current calibration Connect the instrument with the digital multimeter (DMM), precision shunt resistor, and electronic load (or resistor). For details, see Current calibration connections (on page C-8).

  • Page 550: Saving Calibration Constants Using Scpi Commands

    Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Step 12 1. Before starting this calibration step, configure the shunt and load (electronic load or resistor load) as shown in the following table. Model Shunt Power supply 5.05 Ω...

  • Page 551: Configure The Calibration Date

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix C: Calibration and adjustment Configure the calibration date You can configure the calibration date before saving the calibration constants. You can also configure it after saving. To configure the date, send the following command: :CALibration:PROTected:DATE <year>,<month>,<day>...

  • Page 552: Change The Calibration Password

    Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Change the calibration password To change the calibration password from the front panel: 1. Press the MENU key. 2. Under System, select Settings. 3. Select the button next to System Password and press ENTER. The System Password screen is displayed.

  • Page 553: Calibration Constants

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix C: Calibration and adjustment Calibration constants You can use the following command to read all the calibration constants in order of their index number: :CALibration:PROTected:DATA? For 2281S, the default calibration constants are listed in the following table. Index Default Default...
  • Page 554 Appendix C: Calibration and adjustment Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Index Default Default Calibration Error code number constant constant steps value tolerance 166, Step10 Sink I-ADC 100mA full scale Step 10 collected data error 167, Step11 Sink I-ADC 1A zero DMM reading out Step 11 of range 169, Step11 Sink I-ADC 1A zero collected data...

  • Page 555: Status Model

    Appendix D Status model In this appendix: Overview ................. D-1 Programming and reading registers ........D-5 Clearing the registers .............. D-6 Status byte and service request ..........D-7 Status register sets ..............D-9 Queues .................. D-20 Serial polling and SRQ ............D-21 Status model programming examples ........

  • Page 556: Status Model Structure

    Appendix D: Status model Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual The structure of status model is shown in the diagram in Status model structure (on page D-3). The relationship between Questionable Event Register, Questionable Instrument Event Register, and Questionable Instrument Summary Event Register is shown in the diagram in Questionable registers (on page D-3).
  • Page 557 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix D: Status model Status model structure Figure 155: 2281S status model diagram 077114601 / March 2019...
  • Page 558 Appendix D: Status model Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Figure 156: Questionable registers diagram Figure 157: Operation registers diagram 077114601 / March 2019...

  • Page 559: Programming And Reading Registers

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix D: Status model Figure 158: Status model measurement registers Programming and reading registers When you write to or read a status register, you can use binary, decimal, or hexadecimal values to represent the binary values of the bit states.

  • Page 560: Clearing The Registers

    Appendix D: Status model Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Reading the registers You can read any register in the Status Model. The response is a decimal value that indicates which bits in the register are set. See Register bit descriptions (on page D-9) for information on how to convert the decimal value to bits.

  • Page 561: Status Byte And Service Request

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix D: Status model Status byte and service request The Status Byte Register monitors the registers and queues in the status model and generates service requests (SRQs). When bits are set in the status model registers and queues, they generate summary messages that set or clear bits of the Status Byte Register.

  • Page 562: Service Request Enable Register

    Appendix D: Status model Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual The bits of the Status Byte Register are described in the following table: Decimal Bit name When set, indicates the following value has occurred: Measurement summary bit (MSB) An enabled measurement event Not used Not applicable...

  • Page 563: Status Register Sets

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix D: Status model Status register sets The 2281S status structure contains the following status register sets: Standard Event Register Operation Event Register Operation Instrument Event Register Operation Instrument Summary Event Register Questionable Event Register Questionable Instrument Event Register Questionable Instrument Summary Event Register...
  • Page 564 Appendix D: Status model Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Decimal Bit name When set, indicates the following has value occurred: Operation complete (OPC) All pending selected device operations are completed and the 2281S is ready to accept new commands.
  • Page 565 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix D: Status model Operation Event Register The Operation Event Register records the unexpected operation of the power supply. Bit 13 summarizes operation outputs of the power supply. See the following figure and table below it for details.
  • Page 566 Appendix D: Status model Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Operation Instrument Event Register Operation Instrument Event Register summarizes the Operation Instrument Summary Event Register. If bit 1 of the Operation Instrument Event Register is set and bit 1 of Operation Instrument Event Enable Register is enabled, bit 13 (ISUM) of the Operation Event Register is set.
  • Page 567 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix D: Status model Operation Instrument Summary Event Register The bits of the Operation Instrument Summary Event Register are described in the following figure and table. Figure 163: 2281S Operation Instrument Summary Event Register Decimal Bit name When set, indicates the following has occurred:...
  • Page 568 Appendix D: Status model Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Questionable Event Register The bits of the Questionable Event Register are described in the following figure and table. Figure 164: 2281S Questionable Event Register Decimal Bit name When set, indicates the following value has occurred:...
  • Page 569 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix D: Status model Questionable Instrument Event Register Questionable Instrument Event Register summarizes the Questionable Instrument Summary Event Register. If bit 1 of the Questionable Instrument Event Register is set and bit 1 of Questionable Instrument Event Enable Register is enabled, bit 13 (ISUM) of the Questionable Event Register is set.
  • Page 570 Appendix D: Status model Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Questionable Instrument Summary Event Register The bits of Questionable Instrument Summary Event Register are described in the following figure and table. Figure 166: 2281S Questionable Instrument Summary Event Register Decimal Bit name When set, indicates the following has occurred:...
  • Page 571 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix D: Status model Measurement Event Register The bits of the Measurement Event Register are described in the following figure and table below it. Figure 167: 2281S Measurement Event Register Decimal Bit name When set, indicates the following...
  • Page 572 Appendix D: Status model Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Measurement Instrument Event Register Measurement Instrument Event Register summarizes the Measurement Instrument Summary Event Register. If bit 1 of the Measurement Instrument Event Register is set and bit 1 of Measurement Instrument Event Enable Register is enabled, bit 13 (ISUM) of the Measurement Event Register is set.
  • Page 573 Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix D: Status model Measurement Instrument Summary Event Register The bits of the Measurement Instrument Summary Event Register are described in the following figure and table. Figure 169: 2281S Measurement Instrument Summary Event Register Decimal Bit name When set, indicates the following has...

  • Page 574: Event Registers

    Appendix D: Status model Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Event registers Each status register set has an event register. When an event occurs, the appropriate event register bit sets to 1. The bit remains latched to 1 until the register is reset. Reading an event register clears the bits of that register.

  • Page 575: Error Queue

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix D: Status model To clear data from the output queue, read the messages. To read a message from the output queue, address the instrument to talk after the appropriate query is sent. Error queue The error queue holds error messages.

  • Page 576: Srq When Reading Buffer Becomes Full

    Appendix D: Status model Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Status model programming examples The following examples illustrate how to generate an SRQ using the status model. SRQ when reading buffer becomes full This example shows you how to generate an SRQ when the 2281S reading buffer is full. This is useful to notify the controlling computer that it needs to read back the data and empty the buffer.

  • Page 577: Srq When Trigger Model Is Finished

    Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual Appendix D: Status model SRQ when trigger model is finished This example shows you how to generate an SRQ when the trigger model is completed and the power supply has returned to the idle state. After configuring the status model, this code will configure and run the trigger model.
  • Page 578 Specifications are subject to change without notice. All Keithley trademarks and trade names are the property of Keithley Instruments. All other trademarks and trade names are the property of their respective companies. Keithley Instruments Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168 • 1-800-935-5595 • tek.com/keithley 12/17...

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