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KEPCO BIT 4886 Operator's Manual

Digital interface card
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OPERATOR MANUAL
KEPCO INC.
An ISO 9001 Company.
IMPORTANT NOTES:
1)
This manual is valid for the following Firmware Versions:
FIRMWARE VERSION
2)
A Change Page may be included at the end of the manual. All applicable changes and
revision number changes are documented with reference to the equipment serial num-
bers. Before using this Instruction Manual, check your equipment serial number to identify
your model. If in doubt, contact your nearest Kepco Representative, or the Kepco Docu-
mentation Office in New York, (718) 461-7000, requesting the correct revision for your par-
ticular model and serial number.
3)
The contents of this manual are protected by copyright. Reproduction of any part can be
made only with the specific written permission of Kepco, Inc.
Data subject to change without notice.
©2010, KEPCO, INC
P/N 243-1303
KEPCO, INC.
131-38 SANFORD AVENUE
BIT 4886
DIGITAL INTERFACE CARD
WITH GPIB AND RS 232 CAPABILITY
BIT 4886

INTERFACE CARD

FLUSHING, NY. 11355 U.S.A.
email: hq@kepcopower.com
MODEL
NOTE.
KEPCO
THE POWER SUPPLIER™
TEL (718) 461-7000
World Wide Web: http://www.kepcopower.com
®
FAX (718) 767-1102

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Summary of Contents for KEPCO BIT 4886

  • Page 1: Interface Card

    Before using this Instruction Manual, check your equipment serial number to identify your model. If in doubt, contact your nearest Kepco Representative, or the Kepco Docu- mentation Office in New York, (718) 461-7000, requesting the correct revision for your par- ticular model and serial number.

  • Page 3: Table Of Contents

    Adjustment of the Ammeter Zero (R50)..................... 3-1 Calibration of BIT 4886 Interface Card....................3-3 3.3.1 Manual calibration..........................3-6 3.3.2 Calibration of BIT 4886 Interface Card using the VISA Driver Soft Panel ......... 3-9 3.3.2.1 Calibration Basics ........................3-10 3.3.2.2 Calibration Procedure ........................3-11 SECTION 4 - OPERATION General..............................
  • Page 4 TABLE OF CONTENTS SECTION PAGE 4.6.3.2 Measure Subsystem ........................4-13 4.6.3.3 [Source:]voltage And [Source:]current Subsystems..............4-13 4.6.3.4 Output Subsystem........................4-14 4.6.3.5 List Subsystem..........................4-14 4.6.3.5.1 Required LIST Commands..................... 4-14 4.6.3.5.2 Other Required Commands ....................4-14 4.6.3.5.3 Other Useful Commands......................4-15 4.6.3.5.4 Optional Commands.......................
  • Page 5 TABLE OF CONTENTS SECTION PAGE Introduction............................. B-1 Numerical Values ........................... B-2 CALibrate:CPRotect Command ......................B-2 CALibrate:STATus Command ........................ B-2 CALibrate[:STATus]? Query........................B-2 CALibrate:CURRent Command ......................B-3 CALibrate:DATA Command ........................B-3 CALibrate:DPOT Command ........................B-3 CALibrate:LCURR Command ........................ B-4 B.10 CALibrate:LVOLT Command ......................... B-4 B.11 CALibrate:SAVE Command ........................
  • Page 6 TABLE OF CONTENTS SECTION PAGE B.58 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude]? Query............... B-16 B.59 [SOURce:]VOLTage:MODE Command....................B-16 B.60 [SOURce:]VOLTage:MODE? Query....................... B-17 B.61 [SOURce:]VOLTage[:LEVel]:RANGe Command..................B-17 B.62 [SOURce:]VOLTage:[:LEVel]RANGe? Query ..................B-17 B.63 [SOURce:]VOLTage:[:LEVel]RANGe:AUTO Command................. B-17 B.64 [SOURce:]VOLTage[:LEVel]:TRIGgered[:AMPlitude] Command............B-17 B.65 [SOURce:]VOLTage:[:LEVel]:TRIGgered[:AMPlitude]? Query............... B-17 B.66 STATus:OPERation:CONDition Query....................B-18 B.67 STATus:OPERation:ENABle Command....................
  • Page 7 BIT 4886 Card Initialization using VISA Driver.................... 4-4 RS 232 Implementation ..........................4-10 Tree Diagram of SCPI Commands Used with BIT 4886 Interface Card ............. 4-13 Message Structure ............................4-16 Typical Example of Interface Card Program Using SCPI Commands ............4-20 GPIB Commands ............................
  • Page 8 BOP Voltage Specifications with BIT 4886 Installed .................. 1-2 BOP Current Specifications with BIT 4886 Installed .................. 1-2 Specifications, BIT 4886 ..........................1-3 Command Differences for BIT 4886 card Configured as BIT 4882 ............1-4 Items Supplied ............................2-1 Device Address Selection .......................... 2-3 Input/Output Pin Assignments ........................
  • Page 10 (vii Blank)/viii BIT4886 051010...

  • Page 11: Section 1 - Introduction

    4886 provides full talk/listen capability and is fully compliant with the SCPI programming lan- guage. At power-up the BIT 4886 is set to local mode, allowing front panel control of the BOP power Supply. Upon power up the BIT 4886 performs a reset, establishing the voltage and current out- put levels to be 0 volts and the output state to be off.

  • Page 12: Enhanced Operation

    For voltage and current accuracy specifications of BOP Models with a BIT 4886 card installed, refer to Tables 1-2 and 1-3, respectively. Table 1-4 lists the specifications for the BIT 4886 card. TABLE 1-2. BOP VOLTAGE SPECIFICATIONS WITH BIT 4886 INSTALLED...

  • Page 13: Specifications, Bit 4886

    –20 to +85° C NOTES: 1. The current control specification (stability) of BOP power supplies is not altered or improved by the addition of a BIT 4886 card. The current stability of the BIT 4886 card with most BOPs will be 0.015%. However, Some BOP models have better control specifications, e.g., the BOP 20-5 (0.006% stability), and others have lower stability such as the BOP 100-4...

  • Page 14: Bit 4882 Compatibility

    1.3.1 BIT 4882 COMPATIBILITY The BIT 4886 card complies with the SCPI 1997 standard as a member of the power supply instrument class. The Bit 4882 product complies with the 1990 version of the SCPI standard. During the years of 1990 to 1997, the SCPI consortium refined the standard, providing direction for the *RST command and indicating the differences between *RST and the single byte GPIB command of DCL and SDC.

  • Page 15: Section 2 - Installation

    SET START-UP DEFAULTS (SEE FIGURE 2-1) The start-up default, consisting of the Device Address (GPIB address) is initially set by means of DIP switches as described in PAR. 2.2.1. The default power supply identification is described in PAR. 2.2.2. BIT 4886 051010...

  • Page 16: Set (Gpib) Device Address

    2.2.2 POWER SUPPLY IDENTIFICATION The BIT 4886 interface card is factory set to report power supply voltage as 200 Volts and cur- rent as 20 Amperes. The interface card has nonvolatile random access memory which is used to store these values. A special GPIB command of DIAG:PST is used to set the voltage and cur- rent of the power supply which has the BIT 4886 card installed.

  • Page 17: Device Address Selection

    TABLE 2-2. DEVICE ADDRESS SELECTION SELECTOR SWITCH S1 SECTION DECIMAL (SIGNAL LINE) ADDRESS NOTE: 0 = CLOSED (ON) (Towards printed circuit board) 1 = OPEN (OFF) (Away from printed circuit board) BIT 4886 051010...

  • Page 18: Installation Of Interface Card Into The Bop

    PCB Assembly line up with the two mounting posts on the BOP mounting bracket. Step 9. Secure the BIT 4886 Interface Card to the Mounting Posts using the Knurled Nuts and Lockwashers. Mount Connector J204 (Ref. Step 4, above) into Location #3 using the Lockwashers, Hex Spacer and knurled nut.

  • Page 19: Installation Of Model Bit 4886 Into Bop

    FIGURE 2-2. INSTALLATION OF MODEL BIT 4886 INTO BOP BIT 4886 051010...

  • Page 20: Input/Output Signals

    I/O Line I/O Line I/O Line I/O Line Remote Enable Ground (signal common) Ground (signal common) Ground (signal common) Ground (signal common) Ground (signal common) Ground (signal common) LOGIC GND Logic Ground FIGURE 2-3. IEEE 488 (GPIB) CONNECTOR BIT 4886 051010...

  • Page 21: Initial Check-Out Procedure

    RS-232 controller with a DB9 type connector (male pins) by con- necting the RJ45 patch cord supplied (see Table 2-1) to the BIT 4886 RS 232 port (J2), then using the RJ45 to DB9 adapter supplied (see Table 2-1) to connect the RJ45 patch cord to the external controller.
  • Page 22 3. Send the *IDN? query via either the GPIB or RS 232 port. Assuming the BIT 4886 card is installed in a BOP 72-6 as an example, verify that the unit responds with KEPCO,BIT488-6 72-6,A38621 11/10/98,1.81-1.81. If the unit responds with KEPCO,BIT488-6 200-20,A38621 10/01/98,1.81-1.81, it means that the card was not initialized (see PAR.

  • Page 23: Section 3 - Calibration

    EQUIPMENT REQUIRED The following is a listing of equipment required for calibration of the Interface Card installed in a Kepco “BOP” Series Power Supply: A. Precision digital voltmeter (DVM), minimum resolution 7 digits (suggested): B. An IEEE 488 System Controller, (with appropriate software) connected to BOP Power Supply with an IEEE 488 cable.

  • Page 24: Bop Power Supply, Internal Calibration Control Locations

    FIGURE 3-1. BOP POWER SUPPLY, INTERNAL CALIBRATION CONTROL LOCATIONS NOTE: ALL SENSE RESISTORS MUST BE MOUNTED ON A HEATSINK WITH A MINIMUM SURFACE AREA OF 36 SQUARE INCHES TO MAINTAIN THERMAL STABILITY DURING CALIBRATION. FIGURE 3-2. CURRENT SHUNT CONNECTIONS BIT 4886 051010...

  • Page 25: Calibration Of Bit 4886 Interface Card

    Calibration of the BIT 4886 card is performed using SCPI commands. The Instrument driver available at www.kepcopower.com/drivers.htm provides a graphical interface with informational displays and prompts which lead you through the calibration of the BIT 4886 card. This VISA compliant driver works with many GPIB cards from suppliers like National Instruments and Hewlett-Packard.

  • Page 26: Calibration Measurements And Tolerances - Current

    (MAX) 1.00013V BOP 20-10M 0.1 Ohm 1.0V -1.000075V 0.25V -0.25005V ±0.000025V ±0.00005V ±0.00013V (MIN) (MIN) ±0.000075V ±0.00005V 1.020009V 0.030006V (MAX) (MAX) 0.120016V BOP 36-12M -1.020009V 0.03V -0.030006V 0.01 Ohm 0.12V ±0.000003V ±0.000006V ±0.000016V (MIN) (MIN) ±0.000009V ±0.000006V BIT 4886 051010...

  • Page 27: Suggested Sense Resistors

    KT 3146 ISOTEK RTO-B-1R00-1.0 NOTE: ALL SENSE RESISTORS MUST BE MOUNTED ON A HEATSINK WITH A MINIMUM SURFACE AREA OF 36 SQUARE INCHES TO MAINTAIN THERMAL STABILITY DURING CALIBRATION (KEPCO P/N 136-0451 RECOMMENDED FOR KT SENSE RESISTORS LISTED). BIT 4886 051010...

  • Page 28: Manual Calibration

    9. Set the BOP to 1/4 scale (low) range positive output voltage by sending CAL:LVOLT MAX. Output voltage should be as specified in Table 3-1 for LOW RANGE NOMINAL. Measure the voltage output using a Digital Voltmeter of at least 7 digits in accuracy. BIT 4886 051010...
  • Page 29 18.Set the BOP current to 0 Amps in current mode by sending CAL:CURR ZERO. Use the com- mand CAL:DPOT 1 to increase the current or CAL:DPOT -1 to decrease the current until the DVM reads the voltage specified in Table 3-2 for MAIN CURRENT ZERO. BIT 4886 051010...
  • Page 30 CAL:DATA 10 until the voltage is less than the value specified in Table 3-2 for LOW RANGE ACCURACY MIN. Send CAL:DATA -1 until the reading is within the limits specified in Table 3-2 for LOW RANGE ACCURACY MIN. BIT 4886 051010...

  • Page 31: Calibration Of Bit 4886 Interface Card Using The Visa Driver Soft Panel

    CALIBRATION OF BIT 4886 INTERFACE CARD USING THE VISA DRIVER SOFT PANEL Calibration of the BIT 4886 card installed in the BOP is performed using SCPI commands imple- mented through the Instrument driver. The driver provides a graphical interface with informa- tional displays and prompts which lead you through the calibration of the BIT 4886 card.

  • Page 32: Calibration Basics

    Adjustment - Increases the output value by five LSBs. <<<— button Coarse Adjustment - Decreases the output value by 80 LSBs. —>>> button Coarse Adjustment - Increases the output value by 80 LSBs. OK button Enters the value displayed in the white text window. 3-10 BIT 4886 051010...

  • Page 33: Calibration Procedure

    Table 3-1. Click OK when done. 11. Voltage calibration is complete. If desired, the voltage calibration can be repeated by clicking Volt at the calibration panel (Figure 3-4). If current calibration is not necessary, proceed to step 23. 3-11 BIT 4886 051010...
  • Page 34 23.To exit Calibration, click on the Calibration On button on the main panel (Figure 3-3). This will open a panel that allows the calibration to be saved. Click SAVE to save the calibration constants (both voltage and current), or CANCEL to return to the old calibration. 3-12 BIT 4886 051010...

  • Page 35: Section 4 - Operation

    SECTION 4 - OPERATION GENERAL The Kepco BOP Power Supply, with an installed BIT 4886 Interface Card, may be programmed over the IEEE 488 standard communication bus (General Purpose Interface Bus, GPIB) using SCPI (Standard Commands for Programmable Instruments). SCPI provides a common lan- guage used in an automatic test system.

  • Page 36: Programming Example To Verify Previous Command Has Completed

    // so the error queue will not receive a 410 error main( // test code to show operation of function. unit_desc=ibdev(GPIbus,adr,adr/256,T100ms,1,0x40a);Delay(.005); Send (GPIbus,adr,”VOLT 10;curr .01”,sizeof(“VOLT 10;curr .01”),NLEND; Send_with_wait(“*SAV 10”); FIGURE 4-1. PROGRAMMING EXAMPLE TO VERIFY PREVIOUS COMMAND HAS COMPLETED BIT 4886 051010...

  • Page 37: Initialization Of The Bit 4886 Card

    INITIALIZATION OF THE BIT 4886 CARD When a BIT 4886 Card is installed in a BOP it must be initialized prior to use. The initialization of the BOP BIT card can be performed via either GPIB or RS 232 ports. The process can be accomplished using the supplied computer program via the GPIB (see PAR.

  • Page 38: Initialization Using Scpi Commands And Gpib Port

    B. Type ibfind DEVx where x is the hex address of the BOP. C. Type ibwrt "*idn?" D. Type IBREAD 100. The GPIB will show the identifier string of the BOP as: KEPCO, BOP 200-20, with additional characters indicating the revision level of the firmware.

  • Page 39: Initialization Using Scpi Commands And Rs 232 Port

    B. Set Hyperterminal to direct connect at 9600 baud. C. Type *idn? D. Unit responds with the identifier string of the BOP, e.g.,: KEPCO, BOP 200-20, with additional characters indicating the revision level of the firmware. 4. Send the password initialization string of: SYST:PASS:CEN DEFAULT.

  • Page 40: Built In Test

    4.3.1 POWER-UP TEST The power up testing of the BIT 4886 is similar to the *TST command (PAR. A.17). Portions of the card are verified on power-up and errors are indicated by the beep codes listed in Table 4-1. The failed test is repeated indefinitely. The power-up test can be bypassed by placing all DIP switch positions of address switch S1 to up (ON, 1).

  • Page 41: Ieee 488 (Gpib) Bus Protocol

    Card, via the IEEE 488 bus in IEEE 488 command mode and IEEE 488 data mode, respectively. These messages are enabled during the “handshake” cycle, with the Interface Card operating as either a Talker or a Listener. BIT 4886 051010...

  • Page 42: Rs232-C Operation

    RS232-C OPERATION The BIT 4886 card allows the BOP to be operated via an RS232-C terminal, or from a PC using a terminal emulation program. The default settings are as follows: • Baud rate: 9600 • Parity: None • Data Bits •...

  • Page 43: Serial Interface

    (computer) and the BIT 4886, thus avoiding a more complex “handshake” protocol. When the BIT 4886 is in the RS 232 echo mode it returns all data sent to the host controller. The BIT 4886 provides one additional option that allows handshake communication: the XON XOFF method.

  • Page 44: Rs 232 Implementation

    BIT 4886 sends the line terminator sequence CR LF to the command originator. The ESC character is used for synchronization, causing the BIT 4886 to reset its input buffer and return a CR LF sequence. The XON character enables the transmitter if XON/XOFF flow control is enabled (see PAR.

  • Page 45: Echo Mode

    When working in echo mode, it is possible to receive the NAK (15 hex) from the BIT 4886. This indicates an unknown quantity of echoed characters have been lost due to a queue overflow problem.

  • Page 46: Using Scpi Commands For Rs 232 Communication

    4. If the loop back connector was not available and steps 1 And 3 were completed successfully, contact Kepco to obtain loop back connector P/N 195-0111 and rerun the test. If each of the above steps is completed successfully, the problem lies in the computer hardware and/or software.

  • Page 47: Initiate Subsystem

    :POINts? :VERSion? :SEQuence val,val FIGURE 4-5. TREE DIAGRAM OF SCPI COMMANDS USED WITH BIT 4886 INTERFACE CARD 4.6.3.1 INITIATE SUBSYSTEM This subsystem enables the trigger system. When a trigger is enabled, the triggering action will occur upon receipt of a GPIB <GET>, *TRG or TRIGger command. If a trigger circuit is not enabled, all trigger commands are ignored.

  • Page 48: Output Subsystem

    BOP output. 4.6.3.5.2 OTHER REQUIRED COMMANDS VOLT:MODE LIST (PAR. B.59) or CURR:MODE LIST (PAR. B.50). These commands start the list and VOLT:MODE FIX (PAR. B.59) or CURR:MODE FIX (PAR. B.50) stop the list. LIST com- 4-14 BIT 4886 051010...

  • Page 49: Other Useful Commands

    SCPI program messages (commands from controller to power supply) consist of one or more message units ending in a message terminator (required by Kepco power modules). The message terminator is not part of the syntax; it is defined by the way your programming language indi- cates the end of a line (such as a “newline”...

  • Page 50: Keyword

    If a command has two or more keywords, adjacent keywords must be separated by a colon (:) which acts as the keyword separator (e.g., CURR:LEV:TRIG). The colon can also act as a root specifier (paragraph 4.6.4.7). 4-16 BIT 4886 051010...

  • Page 51: Data

    (<CR> <NL>). If both are sent, the second is null and has no effect. Your GPIB interface card software will automatically send a message terminator. For example, the HP BASIC OUTPUT statement inserts <NL> after the last data byte. When binary data is 4-17 BIT 4886 051010...

  • Page 52: Understanding The Command Structure

    <END> must be used. The combination <NL><END> terminator can be used for all data except binary data. NOTE: Kepco power modules require a message terminator at the end of each program mes- sage. The examples shown in this manual assume a message terminator will be added at the end of each message.

  • Page 53: Scpi Program Example

    FLASH EEPROM. The command MEMORY:UPDATE can be used to copy this RAM information to the FLASH EEPROM. The WINDOW variable is stored using the command MEM:UPDATE SHUTDOWN and the other variables, including the DIAG:SAV command, use the command MEMORY:UPDATE INTERFACE 4-19 BIT 4886 051010...

  • Page 54: Error Detection

    4.7.1 ERROR DETECTION The BIT 4886 card has the ability to alter the way the unit responds to detection of load and set- tings errors. The default behavior is for the BIT 4886 to measure the main channel and verify that it is within the specified channel tolerances of the BOP, setting the appropriate bits in the Status Questionable register.

  • Page 55: Using And Saving System Variables

    The BIt 4886 card accomplishes this by partitioning the Flash memory. As the amount of Flash memory used becomes larger with each subsequent data update, the Flash memory can fill up and needs to be compressed.

  • Page 56: Enhanced Operation - Error Response

    The value is calculated using the equation: Current expected /(Current max * 1.1) * 256. The DVS standard setting is 128 derived from (1.1 / 2.2) * 256. The query provides one byte which indicates the actual DAC current limit setting. 4-22 BIT 4886 051010...
  • Page 57 (default = 32). Error window to 40) value xx (hex) value can only be set between 16 (10 Hex) and 64 (40 Hex) using one two-digit hex character (xx) . Query returns 2-digit hex character xx. 4-23 BIT 4886 051010...

  • Page 58: Calibration Storage

    4.7.4.1 CALIBRATION STORAGE The BIT 4886 maintains the calibration tables in Flash Memory until a PACK is executed. There are six calibration areas maintained in Flash Memory: Working, Prior, Oldest, Factory, Master, and First. The calibration can be copied to another area using the CAL:COPY command. The syntax is as...

  • Page 59: Calibration Storage

    The Master calibration should never be overwritten. Factory, Master, and First are set to the same values when a BIT 4886 card is factory-installed in a BOP power supply. The Working cal- ibration is the active calibration. Each time a CAL:SAV is executed, the values are saved in the Working (active) area.

  • Page 61: Appendix A - Scpi Common Command/Query Definitions

    APPENDIX A - SCPI COMMON COMMAND/QUERY DEFINITIONS INTRODUCTION This appendix defines the SCPI common commands and queries used with the BIT 4886 Interface Card. Common commands and queries are preceded by an asterisk (*) and are defined and explained in paragraphs A.2 through A.18, arranged in alphabetical order. Table A-1 provides a quick reference of all SCPI common commands and queries used in the Interface Card.

  • Page 62: Ese? - Standard Event Status Enable Query

    <Manufacturer>, <Model>, <Voltage>, <Current>, <Serial Number>, <Main revision>-<Flash revision> where: <Manufacturer> = KEPCO, <Model> = BIT 4886, <Serial Number> = SSSSSS <date> = (see CAL:SAVE DATE, PAR. B.11) <Main revi- sion=n.m, e.g, 1.0) ><Firmware revision>=n.m (n.m revision, e.g, 1.0) (See example, Figure A-1.) *OPC *OPC —...

  • Page 63: Opc? - Operation Complete Query

    Returns 32 (bit 5 set), indicating Command Error has occurred since the last time the register was read. *IDN? Power supply returns: KEPCO, BIT 4886 100-2 123456 1.8-1.8 *OPC Allows status bit 0 to be set when pending operations complete VOLT 21;CURR 3...

  • Page 64: Opt? - Options Query

    Executing a *RCL recalls the previously defined trigger settings from memory and places them in the trigger control section of the BIT 4886. Executing a second *RCL will cause the values in the trigger control section to be moved to the bit 4886 output channel, allowing the power supply to operate with the recalled trigger information.

  • Page 65: Sre? - Service Request Enable Query

    When all pending operations are complete (all previous commands have been executed, changes in output level have been completed), the WAI command is completed and execution of subsequent commands can continue. A-5/(A-6 Blank) BIT 4886 051010...

  • Page 67: B.1 Introduction

    APPENDIX B - SCPI COMMAND/QUERY DEFINITIONS INTRODUCTION This appendix defines the SCPI subsystem commands and queries used with the BIT 4886 Inter- face Card. Subsystem commands are defined in PAR. B.4 through B.92, arranged in groups as they appear in the tree diagram, Figure 4-5. Table B-1 provides a quick reference of all SCPI subsystem commands and queries used in the Interface Card.

  • Page 68: B.2 Numerical Values

    NUMERICAL VALUES The SCPI data parser on the BIT 4886 supports a maximum of 8 digits after the decimal point and a maximum integer of 4 x 10 . Any values greater than these are not processed by the device and no error is generated.

  • Page 69: B.6 Calibrate:current Command

    This command is only effective if Calibration status and either Voltage Zero, Voltage Maximum. Current Zero or Current Maximum calibration are active. CAL:STAT, CAL:VOLT, CAL:LVOL, CAL:VOLT, CAL:CURR, CAL:DATA, CAL:ZERO, CAL:SAVE. (See example, Figure B-1.) BIT 4886 051010...

  • Page 70: B.9 Calibrate:lcurr Command

    Voltage or Current calibration. The next command should select the new parameter to be calibrated. Related Commands: CAL:STAT, CAL:VOLT, CAL:CURR, CAL:SAVE. (See example, Figure B-1.) BIT 4886 051010...

  • Page 71: B.15 Initiate[:Immediate] Command

    B.21 OUTPut[:STATe] QUERY Syntax: Short Form: OUTP[:STAT]? Long Form: OUTPut[:STATe]? Return Value: <int_value> (0 or 1) Description: Indicates whether power supply output is enabled or disabled. Returns 0 if output disabled, returns 1 if output enabled. Related Commands: OUTP. BIT 4886 051010...

  • Page 72: B.22 [Source:]Function:mode Command

    Commands: LIST:GEN, LIST:SEQ, LIST:DIR. (See example, Figures B-2 and B-3.) LIST:COUN? B.28 [SOURce:]LIST:COUNt? QUERY Syntax: Short Form: LIST:COUNT? Long Form: LIST:COUNt? Return Value: <int_value> Description: Identifies how many times the list will be executed. Returns value set by LIST:COUN command. (See example, Figure B-3.) BIT 4886 051010...

  • Page 73: B.29 [Source:]List:count:skip Command

    LIST:CURR:POIN? These locations correspond to the default sequence (LIST:GEN DESQ). The max- imum number of entries is 1002. Since the input buffer of the BIT 4886 has a limit of 253 characters, multiple commands are necessary to complete the full 1002 entries of the list. If LIST:VOLT has any entries, an error message: -221,"Settings conflict"...

  • Page 74: B.34 [ [Source:]List:direction Command

    LIST:DWEL command. If LIST:DWEL:POIN? returns 6, dwell times have been entered for locations 0 through 5 and location 6 is the next to be filled by a LIST:DWEL command. LIST:DWEL, LIST:DWEL:POIN. (See example, Figure B-3.) BIT 4886 051010...
  • Page 75 10 (from LIST COUN) x 20 (total number of repeated list steps) x 2 seconds (dwell time of each step) = 400 seconds + 2 seconds (dwell time of first step, run only once) = 402 seconds. FIGURE B-2. USING LIST COMMANDS FOR SAWTOOTH AND TRIANGLE WAVEFORMS BIT 4886 051010...

  • Page 76: B-3 Using List Commands And Queries

    Returns -20 (the last step in the list set the unit to -20V. LIST:GEN? Returns SEQ to indicate the list will be executed in the user-determined order entered by LIST:SEQ (Table B-3). FIGURE B-3. USING LIST COMMANDS AND QUERIES (SHEET 1 OF 2) B-10 BIT 4886 051010...
  • Page 77 Sets unit to 1/4 scale (e.g., for BOB 20-20M, maximum voltage now 5V. VOLT: 3 Output goes to +3V for 0.05 second, then returns to -4V. FIGURE B-3. USING LIST COMMANDS AND QUERIES (SHEET 2 OF 2) B-11 BIT 4886 051010...

  • Page 78: B.39 [Source:]List:generation Command

    LIST:QUERy, returns comma-separated list of up to 16 values indicating the user-determined sequence for executing the list, i.e., the contents of the SEQ locations of Table B-3. Related Com- mands: LIST: SEQ, LIST:QUERy. (See example, Figure B-3.) B-12 BIT 4886 051010...

  • Page 79: B.45 [Source:]List:voltage Command

    Next location indicated by LIST:VOLT:POIN? These locations correspond to the default sequence (LIST:GEN DESQ) The maximum number of entries is 1002. Since the input buffer of the BIT 4886 has a limit of 253 characters, multiple commands are necessary to complete the full 1002 entries of the list.

  • Page 80: B.50 [Source:]Current:mode Command

    VOLT:MODE TRANs (see PAR. B.59 for examples). If the time nn exceeds 10 seconds, error mes- sage -222 “data out range” is posted to the error queue. Related Commands: LIST commands. (See example, Figures B-2 and B-3.) B-14 BIT 4886 051010...

  • Page 81: B.51 [Source:]Current:mode? Query

    B.56 [SOURce:]CURRent[:LEVel]TRIGgered[:AMPlitude]? QUERY Syntax: Short Form: [SOUR:]CURR[:LEV]:TRIG[:AMP]? Long Form: [SOURce:]CURRent[:LEVel]:TRIGgered[:AMPlitude]? Return Value: <exp_value> = digits with decimal point and Exponent, e.g., 2.71E1 for 27.1 Description: Returns the current value established by CURR:TRIG command. (See example, Figure B-5.) B-15 BIT 4886 051010...

  • Page 82: B.57 [Source:]Voltage[:Level][:Immediate][:Amplitude] Command

    VOLT:10 is issued, the power supply output goes to 10V for 0.02 seconds, then reverts to 25V. Simi- larly, sending VOLT:TRIG 14, VOLT:MODE TRAN .05 and *TRG causes the output to go to 14V for 0.05 seconds, then revert to 25V. Related Commands: LIST commands. (See example, Figures B-2 and B-3.) B-16 BIT 4886 051010...

  • Page 83: B.60 [Source:]Voltage:mode? Query

    Return Value: <exp_value> = digits with decimal point and Exponent, e.g., 2.71E1 for 27.1 Description: Returns value established by VOLT:TRIG command representing voltage value to be pro- grammed by *TRG or TRIG command. (See example, Figure B-5.) B-17 BIT 4886 051010...

  • Page 84: B.66 Status:operation:condition Query

    Long Form: STATus:PRESet Description: Disables reporting of all status events. This command sets all bits of the Operation Condition (Table B-4) and Questionable Condition Registers to 0, preventing all status events from being reported. (See example, Figure B-6.) B-18 BIT 4886 051010...

  • Page 85: B-6 Using Status Commands And Queries

    TABLE B-5. QUESTIONABLE EVENT REGISTER, QUESTIONABLE CONDITION REGISTER AND QUESTIONABLE CONDITION ENABLE REGISTER BITS CONDITION CURRENT ERROR VOLTAGE ERROR 15-14 11 - 2 CM CURRENT MODE VOLTAGE MODE VALUE 32,768 -16,359 8192 4096 2048 - 4 NOT USED B-19 BIT 4886 051010...

  • Page 86: B.72 Status:questionable:condition? Query

    Long Form: SYSTem:COMMunication:SERial:PACE {NONE | XON} Return Value: {XON | NONE} Description: Identifies whether data flow control via the serial interface is enabled (XON) or disabled (NONE) (see PAR. 4.5.2.2). See PAR. 4.1.1.2 and Figure 4-1 for special programming considerations. B-20 BIT 4886 051010...

  • Page 87: B.80 System:error? Query

    Short Form: SYST:REM? Long Form: SYSTem:REMote? Return Value: {1 | 0} Description: Identifies whether unit it in remote mode (1) or local mode (0) during serial (RS 232) communi- cation. See PAR. 4.5.3 and Figure B-7. B-21 BIT 4886 051010...

  • Page 88: B-6 Error Messages

    Error queue was full, error events have been lost. -350,”Queue Overflow” -400,”QueryError” Data requested was lost due to 253 character limit of BIT 4886 output Query Error bit 2 buffer. Controller sent query but did not accept data from power supply. See -420,”Query Unterminated”...

  • Page 89: B-8 Using System Commands And Queries

    SYST:SET? Unit returns DC0,LF0,RL0 SYST:PASS:NEW DEFAULT,OKAY Unit changes password to be OKAY SYST:SET LF1,RL1,DC1 Configures BIT 4886 card as BIT 4882 (see PAR. 1.3.1). DIAG:SAV;:SYST:ERR:CODE? BOP returns -231 indicating command is protected SYST:PASS:CEN OKAY Password enabled commands are accepted DIAG:SAV Unit saves the LF1 state for next power on cycle.

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