Page 1 Keysight Advanced Power System N6900/N7900 Series Operating and Service Guide...
Page 3: Table Of Contents
Legal and Safety Information Legal Notices Software License Files Warranty Certification US Government Rights Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC Safety Notices Safety Symbols 1 Quick Reference Introduction to the Instrument Advanced Power System at a Glance Front Panel at a Glance Front Panel Display at a Glance Front Panel Keys at a Glance Rear Panel at a Glance...
Page 4 Introduction Specifications - Keysight N6900 Series Specifications - Keysight N7900 Series Specifications - Keysight N6900/N7900 High Voltage Series Supplemental Characteristics - Keysight N6900 Series Supplemental Characteristics - Keysight N7900 Series Supplemental Characteristics - Keysight N6900/N7900 High Voltage Series Common Characteristics...
Page 5 GPIB Connections USB Connections LAN Connections - site and private Digital Port Connections Rack Mounting Installing the Instrument Black Box Recorder Installing the BBR 3 Getting Started Using the Front Panel Turn the Unit On Set the Output Voltage Set the Output Current Set Over-voltage Protection Enable the Output Use Built-in Help System...
Page 6 Programming a Step Transient Programming a List Transient Programming an Arbitrary Waveform Sequencing the Output Turn-On Turn-Off Behavior Turn-On/Turn-Off Delays Enabling/Disabling the Output Sequencing Multiple Units Making Measurements Average Measurements Number of Power Line Cycles (NPLC) Measurement Windowing Seamless Current Measurement Ranging Amp-Hour and Watt-Hour Measurements Temperature Measurements Digitized Measurements...
Page 7 Snapshot Operation Snapshot Event Tags BBR Clock Setup BBR Alignment Current Sharing Operation Introduction Enable the Current Sharing Function Program the On Couple and Off Couple Function Program the Output Voltage and Current Program a Step Function for Additional Output Changes Enable the Output and Trigger Additional Output Changes Specification Effects Current Sharing Effects...
Page 8 Viewing Snapshot Events Exporting the Snapshot Data Saving the Snapshot File 6 SCPI Programming Reference IO Libraries and Instrument Drivers Web Interface Example Programs Introduction to the SCPI Language Introduction Keywords Queries Command Separators and Terminators Syntax Conventions Parameter Types Device Clear Typical Command Processing Times Commands by Subsystem...
Page 9 Status Byte Register Error and Output Queues Status Diagram Trigger Tutorial Trigger Sources Trigger Destinations Trigger Diagram Reset State (*RST) SCPI Error Messages Compatibility Commands Channel Parameter Aliased Commands Code Compatible Commands Commands and Parameters that Work Differently 7 Verification and Calibration Recommended Test Equipment and Setups Test Equipment Measurement Techniques...
Page 10 N6954A/N6974A N6950A/N6970A with Option 301 N6951A/N6971A with Option 301 N6952A/N6972A with Option 301 N6953A/N6973A with Option 301 N6954A/N6974A with Option 301 N7950A/N7970A N7951A/N7971A N7952A/N7972A N7953A/N7973A N7954A/N7974A N6976A N6977A N7976A and N6976A with Option 301 N7977A and N6977A with Option 301 8 Service and Maintenance Introduction Types of Service Available...
Page 11: Legal And Safety Information
No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Keysight Technologies as governed by United States and international copyright laws. Keysight Technologies...
Page 12: Warranty
Certification Keysight Technologies certifies that this product met its published specifications at time of shipment from the factory. Keysight Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology, to the extent allowed...
Page 13: Safety Notices
Failure to comply with these precautions or with specific warnings or instructions elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Keysight Technologies assumes no liability of the customer’s failure to comply with the requirements.
Page 14: Safety Symbols
Legal and Safety Information Safety Symbols A WARNING notice denotes a hazard. It calls attention to an operating procedure, prac- tice, or the like that, if not correctly performed or adhered to, could result in personal injury or death. Do not proceed beyond a WARNING notice until the indicated conditions are fully understood and met.
Page 15: Quick Reference
For the latest firmware revision go to Firmware Updates. If you have questions about your shipment, or if you need information about warranty, service, or technical support, contact Keysight Technologies. Contacting Keysight Technologies www.keysight.com/find/assist for information on contacting Keysight worldwide, or contact your Keysight Technologies Representative.
Page 16: Introduction To The Instrument
1 Quick Reference Introduction to the Instrument Advanced Power System at a Glance Front Panel at a Glance Front Panel Display at a Glance Front Panel Keys at a Glance Rear Panel at a Glance Power Dissipator at a Glance Advanced Power System at a Glance The Advanced Power System (APS) includes 1U and 2U rack-mountable DC power supplies and power dissipators with performance and features that are optimized for automated test systems.
Page 17: Front Panel At A Glance
1 Quick Reference Measurement features 5.12 μs sample rate Real-time power measurements Amp-Hour and Watt-Hour Measurements Seamless current measurements across ranges on Digitized measurement capability on N7900 models Continuous "external" data logging on N7900 models Continuous "Black Box" data recording available as an installable accessory System features Save and recall up to 10 instrument states in non-volatile memory Customized signal routing capability...
Page 18: Front Panel Display At A Glance
1 Quick Reference Front Panel Display at a Glance Voltage and current meas- Displays the actual output voltage and current urements Operating mode Indicates one of the following: OFF = the output is off CV = the output is in constant voltage mode CC = the output is in constant current mode CP+ = the output is disabled by the positive power limit CP–...
Page 19: Front Panel Keys At A Glance
1 Quick Reference Front Panel Keys at a Glance The following table lists the main parts of the front panel, generally from left to right: The On/Off switch turns the unit on or off. The indicator next to the On/Off switch shows the display status.
Page 20: Rear Panel At A Glance
1 Quick Reference Rear Panel at a Glance The following table lists the main parts of the rear panel, generally from left to right: GPIB The GPIB interface connector Digital IO The digital IO pins The USB interface connector The LAN interface connector Chassis ground The chassis ground terminal.
Page 21: Power Dissipator At A Glance
1 Quick Reference Power Dissipator at a Glance The following table lists the main parts of the front and rear panels: Status LED Green - the N7909A has been recognized by the power supply and is fully operational. Yellow - power is available, but no communication established with the power supply.
Page 22: Front Panel Menu Reference
1 Quick Reference Front Panel Menu Reference This is an overview of the front-panel menus. Press the Menu key to access the front panel menus. For a brief tutorial on how to navigate the front panel menu, refer to Use the front panel menu.
Page 23 1 Quick Reference 1st Menu Level 2nd Level 3rd & 4th Levels Description Pace Specifies Dwell or Trigger paced list Repeat Specifies number of list repetitions, or continuous list Terminate Specifies list termination conditions Config Configures individual list step settings Reset Aborts the list and resets all list settings Displays Arb commands...
Page 24 1 Quick Reference 1st Menu Level 2nd Level 3rd & 4th Levels Description Defaults Resets the network to the as-shipped defaults and restarts Displays USB identification string GPIB Display or change the GPIB address DigPort Displays DigPort commands Pins Configures the individual digital port pins Data Reads/writes data to the digital port Displays Black Box Recorder commands...
Page 25 1 Quick Reference 1st Menu Level 2nd Level 3rd & 4th Levels Description Count View the calibration count Date Saves the calibration date Save Saves the calibration data Enables/disables the LAN, USB, and GPIB Sanitize Performs NISPOM secure erase of all user data Update Password protected firmware update Options...
Page 26: Command Quick Reference
1 Quick Reference Command Quick Reference Some [optional] commands have been included for clarity. All settings commands have a corresponding query. See the Syntax Conventions for SCPI. ABORT Subsystem ABORt :ACQuire Cancels any triggered measurements. :ELOG Stops external data logging. :TRANsient Cancels any triggered actions.
Page 27: Fetch Subsystem
1 Quick Reference FETCh Subsystem FETCh [:SCALar] :CURRent [:DC]? [<start_index>, <points>] Returns the averaged measurement. :ACDC? Returns the RMS measurement (AC + DC). :HIGH? Returns the High level of a pulse waveform. :LOW? Returns the Low level of a pulse waveform. :MAXimum? Returns the maximum or minimum value.
Page 28: Hcopy Subsystem
1 Quick Reference HCOPy Subsystem HCOPy :SDUMp :DATA? [BMP|GIF|PNG] Returns an image of the front panel display. :DATA :FORMat BMP|GIF|PNG Specifies the format for front panel images returned. IEEE-488 Common Commands *CLS Clear status command. *ESE <value> Event status enable command and query. *ESR? Event status event query.
Page 29: Measure Subsystem
1 Quick Reference MEASure Subsystem MEASure [:SCALar] :CURRent [:DC]? Takes a measurement; returns the averaged current. :ACDC? Takes a measurement; returns the RMS current (AC + DC). :HIGH? Takes a measurement; returns the High level of a current pulse. :LOW? Takes a measurement;...
Page 30: Sense Subsystem
1 Quick Reference :SOURce EXPRession<1-8>|NONE Sets the on-couple signal source to an expression. :DELay :FALL <value> Sets the output turn-off sequence delay. :RISE <value> Sets the output turn-on sequence delay. :INHibit :MODE LATChing|LIVE|OFF Sets the operating mode of the remote inhibit digital pin. :PON :STATe RST|RCL0 Sets the output power-on state.
Page 31: [Source:]Arb Subsystem
1 Quick Reference :FUNCtion :CURRent 0|OFF|1|ON Enables/disables current data logging. :MINMax 0|OFF|1|ON Enables/disables min/max current data logging. :VOLTage 0|OFF|1|ON Enables/disables voltage data logging. :MINMax 0|OFF|1|ON Enables/disables min/max voltage data logging. :PERiod <value> Sets the integration time of an Elog measurement. :FAULt :STATe 0|OFF|1|ON Enables or disables remote sense fault detection.
Page 32: [Source:]Current Subsystem
1 Quick Reference :TYPE CURRent|VOLTage Specifies either a voltage or current Arb. :TERMinate :LAST 0|OFF|1|ON Selects the output setting after the Arb ends. :VOLTage :CDWell [:LEVel] <value>{,<value>}|<Block> Specifies the level of each point in the Arb. :DWELl <value> Specifies the dwell time of each point in the Arb. :POINts? Returns the number of points in the Arb.
Page 33: [Source:]Function Command
1 Quick Reference :DATA <value> Sets the state of the digital control port. :PIN<1-7> :FUNCtion <function> Sets the function of the pins. DIO |DINPut |EXPRession<1-8> |FAULt |INHibit |ONCouple |OFFCouple |TOUTput |TINPut :POLarity POSitive|NEGative Sets the polarity of the pins. :TOUTput :BUS [:ENABle] 0|OFF|1|ON Enables or disables BUS triggers on digital port pins.
Page 34: [Source:]Resistance Subsystem
1 Quick Reference [SOURce:]Resistance Subsystem [:SOURce] :RESistance [:LEVel] [:IMMediate] [:AMPLitude] <value> Sets the output resistance level. :STATe 0|OFF|1|ON Enables or disables output resistance programming. [SOURce:]STEP Command [SOURce:] :STEP :TOUTput0|OFF|1|ON Specifies whether a trigger out is generated when a transient step occurs. [SOURce:]VOLTage Subsystem [SOURce:] VOLTage...
Page 35: Status Subsystem
1 Quick Reference STATus Subsystem STATus :OPERation [:EVENt]? Queries the operation event register. :CONDition? Queries the operation condition register. :ENABle <value> Sets the operation enable register. :NTRansiton <value> Sets the Negative transition filter :PTRansiton <value> Sets the Positive transition filter :USER<1|2>...
Page 36: Trigger Subsystem
1 Quick Reference :DEFine EXPRession<1-8>, Defines up to eight signal expressions. <"expression"> :TEMPerature :AMBient? Returns the temperature at the air inlet. :TIME <hh>,<mm>,<ss> Sets the time of the system clock. :VERSion? Returns the SCPI version that the instrument complies with. TRIGger Subsystem TRIGger :ACQuire...
Page 37: Model Features And Options
1 Quick Reference Model Features and Options Model Features Feature Keysight N6900 models Keysight N7900 dynamic models l = included 1 kW 2 kW 1 kW 2 kW Voltage/Current N6950A 9 V/100 A N6970A 9 V/200 A N7950A 9 V/100 A N7970A 9 V/200 A Ratings N6951A 20 V/50 A...
Page 38 1 Quick Reference Feature Keysight N6900 models Keysight N7900 dynamic models l = included 1 kW 2 kW 1 kW 2 kW Faster programming Option 303 Output lists Option 303 Arbitrary wavedforms Option 303 Black box recorder Option BBR Option BBR 1 2 kW models with one power dissipator can sink 50% of their rated current.
Page 39: Accessories/Options
1 Quick Reference Accessories/Options Accessory/ Description Option Number Keysight N7909A 1 kW power dissipator. 1 unit is required for 1 kW power supplies to sink the rated out- put power; 2 units are required for 2 kW power supplies to sink the rated output power.
Page 40: Specifications And Characteristics
Specifications and Characteristics Specifications - Keysight N6900 Series Specifications - Keysight N7900 Series Specifications - Keysight N6900/N7900 High Voltage Series Supplemental Characteristics - Keysight N6900 Series Supplemental Characteristics - Keysight N7900 Series Supplemental Characteristics - Keysight N6900/N7900 High Voltage Series Common Characteristics...
Page 41: Specifications - Keysight N6900 Series
1 Quick Reference Specifications - Keysight N6900 Series 1 kW Specifications N6950A N6951A N6952A N6953A N6954A DC Ratings Voltage source: 0 to 9 V 0 to 20 V 0 to 40 V 0 to 60 V 0 to 80 V Current source:...
Page 42: Specifications - Keysight N7900 Series
1 Quick Reference 2 kW Specifications N6970A N6971A N6972A N6973A N6974A Voltage programming & measurement accuracy 4, 5, 6 Lead drop ≤1 V max: 0.03% +1.5 mV 0.03% +3 mV 0.03% +6 mV 0.03% +9 mV 0.03% +12 mV Lead drop ≤25% of V rating: 0.03% +1.9 mV 0.03% +4 mV 0.03% +7.9 mV...
Page 43 1 Quick Reference 1 kW Specifications N7950A N7951A N7952A N7953A N7954A Current programming & measurement accuracy: 4 0.04% +15 mA 0.04% +8 mA 0.04% +4 mA 0.04%+2.5 mA 0.04% +2 mA Current low range measurement accuracy: 0.05% +3 mA 0.05% +1 mA 0.05% +0.6 mA 0.05% +0.3 mA 0.05% +0.25mA...
Page 44: Specifications - Keysight N6900/N7900 High Voltage Series
1 Quick Reference Specifications - Keysight N6900/N7900 High Voltage Series 2 kW Specifications N6976A N6977A N7976A N7977A DC Ratings Voltage source: 0 to 120 V 0 to 160 V 0 to 120 V 0 to 160 V Current source: 0 to 16.7 A 0 to 12.5 A 0 to 16.7 A 0 to 12.5 A...
Page 45: Supplemental Characteristics - Keysight N6900 Series
1 Quick Reference Supplemental Characteristics - Keysight N6900 Series 1 kW Characteristics N6950A N6951A N6952A N6953A N6954A Minimum compliance limits Voltage priority: 100 mA 50 mA 25 mA 16 mA 13 mA Current priority: 9 mV 20 mV 40 mV...
Page 46 1 Quick Reference 1 kW Characteristics N6950A N6951A N6952A N6953A N6954A Output current noise 5 CC rms: 15 mA 15 mA 15 mA 15 mA 15 mA Common mode current 5 CC rms: 2 mA 1 mA 1 mA 1 mA 1.5 mA CC peak-to-peak: 10 mA...
Page 47 1 Quick Reference 2 kW Characteristics N6970A N6971A N6972A N6973A N6974A Current programming Range-no dissipator: -20.4 to 204 A –10.2 to 102 A –5.1 to 51 A –3.4 to 33.97 A –2.55 to 25.5 A Range-with dissipator: –204 to 204 A –102 to 102 A –51 to 51 A –33.97 to 33.97 A...
Page 48 1 Quick Reference 2 kW Characteristics N6970A N6971A N6972A N6973A N6974A Voltage up- programming time 6 10% to 90%: 3 ms Settling time: 8 10 ms 0.5 ms 10% to 90%: 1 ms Settling time: 8 Voltage down- programming time 7 90% to 10%: 3 ms Settling time: 8...
Page 49: Supplemental Characteristics - Keysight N7900 Series
1 Quick Reference Supplemental Characteristics - Keysight N7900 Series 1 kW Characteristics N7950A N7951A N7952A N7953A N7954A1 Minimum compliance limits Voltage priority: 100 mA 50 mA 25 mA 16 mA 13 mA Current priority: 9 mV 20 mV 40 mV 60 mV 80 mV Voltage programming...
Page 50 1 Quick Reference 1 kW Characteristics N7950A N7951A N7952A N7953A N7954A1 Voltage up- programming time 6 10% to 90%: 0.5 ms Settling time: 8 1 ms Voltage down- programming time 7 90% to 10%: 0.35 ms Settling time: 8 0.8 ms Current up- and down- programming time 9 10% to 90%:...
Page 51 1 Quick Reference 2 kW Characteristics N7970A N7971A N7972A N7973A N7974A Current programming & measurement TempCo 2 0.0029%+500µA 0.0031%+250µA 0.0035%+120µA 0.0032%+80µA 0.0032%+60µA High range: 0.0040%+160µA 0.0041%+80µA 0.0045%+40µA 0.0042%+24µA 0.0041%+18µA Low range: Resistance programming TempCo: 0.0043% 0.0045% 0.0049% 0.0046% 0.0045% Over-Voltage Protection Maximum setting: 10.8 V 24 V...
Page 52: Supplemental Characteristics - Keysight N6900/N7900 High Voltage Series
1 Quick Reference 1 Resistance programming accuracy varies with output current. For example, for an N7970A unit at 0.1Ω with a 50A transient, accuracy is: (0.1Ω * 0.06%) + (1.6mΩ*A/50A) = 92 µΩ. 2 Per degree C 3 From occurrence of over-voltage to start of shutdown 4 With single point averaging 5 From 20 Hz to 300 kHz for rms noise;...
Page 53 1 Quick Reference 2 kW Characteristics N6976A N6977A N7976A N7977A Resistance programming TempCo: 0.0060% 0.0060% 0.0050% 0.0046% TempCo: 0.0050% 0.0046% Over-Voltage Protection Maximum setting: 144 V 192 V 144 V 192 V Response time: 3 <30 µs <30 µs <30 µs <30 µs Accuracy: 0.03% +17 mV...
Page 54: Common Characteristics
1 Quick Reference 1 Resistance programming accuracy varies with output current. For example, for an N7970A unit at 0.1Ω with a 50A transient, accuracy is: (0.1Ω * 0.06%) + (1.6mΩ*A/50A) = 92 µΩ. 2 Per degree C 3 From occurrence of over-voltage to start of shutdown 4 With single point averaging 5 From 20 Hz to 300 kHz for rms noise;...
Page 55 1 Quick Reference Common Characteristic All Models Environmental Operating environment: Indoor use, installation category II (for AC input), pollution degree 2 Temperature range: 0°C to 55°C (Maximum continuous power available is derated at 1% of rating per degree C from 40°C to 55°C) Relative humidity: 95% or less (non-condensing)
Page 56: Output Impedance Graphs
1 Quick Reference Output Impedance Graphs 1 kW Models 2 kW Models 9 V, 2 kW Output Impedance 9 V, 1 kW Output Impedance 20 V, 2 kW Output Impedance 20 V, 1 kW Output Impedance Keysight N6900/N7900 Series Operating and Service Guide...
Page 57 1 Quick Reference 1 kW Models 2 kW Models 40 V, 2 kW Output Impedance 40 V, 1 kW Output Impedance 60 V, 2 kW Output Impedance 60 V, 1 kW Output Impedance 80 V, 2 kW Output Impedance 80 V, 1 kW Output Impedance Keysight N6900/N7900 Series Operating and Service Guide...
Page 58: Inductive Load Boundary
1 Quick Reference 1 kW Models 2 kW Models 120 V, 2 kW Output Impedance 160 V, 2 kW Output Impedance Inductive Load Boundary The following figures show the boundary limitation for inductive loads and for fast CV/CC mode crossover operation. Operation above the inductive load boundary may result in output instability. The boundary limit represents operating conditions including a 20% current overshoot.
Page 59: Output Quadrants
1 Quick Reference Output Quadrants N6950A N6951A N6952A N6953A N6954A 1 kw Models N7950A N7951A N7952A N7953A N7954A + Voltage rating 20 V 40 V 60 V 80 V + Current rating 100 A 50 A 25 A 16.7 A 12.5 A - Current rating -100 A...
Page 60: Voltage Programming Response
1 Quick Reference Voltage Programming Response The following graphs show the output voltage programming response characteristic. These graphs apply for small signals only, under no load condition. Output Dynamic Response The following graph shows the square wave amplitude thresholds versus frequency for each model. Above the indicated amplitude threshold, sustained generation of a square wave may lead to engagement of the excessive dynamic protection (EDP) function, which disables the output.
Page 61: Measurement Accuracy And Resolution - With Shorter Measurement Intervals
1 Quick Reference Measurement Accuracy and Resolution - with shorter measurement intervals The following table shows changes to the short-term measurement accuracy and resolution with various number of power line cycle (NPLC) measurement settings. Changes are due to the A-to-D converter’s noise performance.
Page 62: Dimension Diagrams - All Dimensions In Millimeters
1 Quick Reference Dimension Diagrams - all dimensions in millimeters Power Dissipator Unit Keysight N6900/N7900 Series Operating and Service Guide...
Page 63 1 Quick Reference 1 kW Models Keysight N6900/N7900 Series Operating and Service Guide...
Page 64 1 Quick Reference 2 kW Models Keysight N6900/N7900 Series Operating and Service Guide...
Page 65: Installing The Instrument
Keysight N6900/N7900 Series Operating and Service Guide Installing the Instrument Before Installation or Use Single Unit Connections Parallel Connections Series Connections Power Dissipator Connections Interface Connections Rack Mounting Black Box Recorder...
Page 66: Before Installation Or Use
2 Installing the Instrument Before Installation or Use Inspect the Unit When you receive your APS unit, inspect it for any obvious damage that may have occurred during shipment. If there is damage, notify the shipping carrier and nearest Keysight Sales and Support Office immediately.
Page 67: Review Safety Information
2 Installing the Instrument Review Safety Information This power supply is a Safety Class 1 instrument, which means it has a protective earth terminal. That terminal must be connected to earth ground through a power source equipped with an earth ground. Refer to the Safety Summary page for general safety information.
Page 68: Single Unit Connections
2 Installing the Instrument Single Unit Connections Line Cord Connection Output Connections Single Load Connections Multiple Load Connections Remote Sense Connections Additional Load Considerations Line Cord Connection FIRE HAZARD Use only the power cord that was supplied with your instrument. Using other types of power cords may cause overheating of the power cord, resulting in fire.
Page 69: Sense Connections
2 Installing the Instrument Sense Connections A sense cable is shipped along with your instrument. Install the sense cable between the sense connector to the output terminals. Insert the plug into the sense connector and attach the spade connectors to the screws provided on the output terminals. Observe polarity when installing the sense cable.
Page 70 2 Installing the Instrument Wire Size FIRE HAZARD To satisfy safety requirements, load wires must be large enough not to overheat when carrying the maximum short circuit current of the power supply. If there is more than one load, then any pair of load wires must be capable of safely carrying the full-rated current of the supply.
Page 71: Single Load Connections
2 Installing the Instrument Single Load Connections Tightening torque cannot exceed 10.8 Nm (8 lb-ft). 1. As shown in the following figure, terminate all load wires with wire terminal lugs securely attached. DO NOT use unterminated wires for load connections at the power supply. 2.
Page 72: Multiple Load Connections
2 Installing the Instrument Multiple Load Connections If you are using local sensing and are connecting multiple loads to one output, connect each load to the output terminals using separate connecting wires as shown in the following figure. This minimizes mutual coupling effects and takes full advantage of the power supply's low output impedance.
Page 73 2 Installing the Instrument First remove the sense cable between sense and load terminals Push in the orange release tabs with a small flat-blade screwdriver to release and insert the sense wires. Keep the sense wire size between AWG 16 (1.5 mm 2 ) maximum and AWG 24 (0.2 mm 2 ) minimum. Strip thewire insulation back 10 mm.
Page 74 2 Installing the Instrument Open/Shorted/Reverse Sense Lead Detection The sense leads are part of the output's feedback path. Connect them in such a way so that they do not inadvertently become open circuited. When an open sense lead is detected prior to output turn-on or while the output is on, the instrument responds with a sense fault (SF) status indication on the front panel.
Page 75: Additional Load Considerations
2 Installing the Instrument The noise specifications documented under Specifications apply at the output terminals when using local sensing. However, voltage transients may be produced at the load by noise induced in the leads or by load current transients acting on the inductance and resistance of the load lead. If it is desirable to keep voltage transient levels to a minimum, place an aluminum or tantalum capacitor, with an approximate value of 10 microfarad per foot (30.5 cm) of load lead, right across the load.
Page 76: Parallel Connections
2 Installing the Instrument Parallel Connections Parallel Description Sharing Cable Fabrication Load, Sense, and Sharing Connections Parallel Description Connecting power supplies in parallel provides a greater current capability than can be obtained from a single unit. The use of current sharing is highly recommended (for further information refer to Current Sharing Operation).
Page 77: Sharing Cable Fabrication
2 Installing the Instrument Units of mixed power (1 kW and 2 kW) with the same voltage rating can participate in current shar- ing. This lets you take advantage of the higher current capability of the 2 kW units. Sharing Cable Fabrication A connector plug is supplied with each unit, but the cable itself must be fabricated.
Page 78 2 Installing the Instrument Keysight N6900/N7900 Series Operating and Service Guide...
Page 79: Series Connections
Series Diode Considerations. If using the series diode is not acceptable in your application, please contact Keysight Technologies to speak to a power product support engineer for assistance. The following warnings and cautions must be followed in all cases: SHOCK HAZARD Floating voltages must not exceed 240 VDC.
Page 80: Load, Sense, And Diode Connections
2 Installing the Instrument For 40V, 60V, 80V, 120V and 160V N6900 models without relay disconnect option 760 or 761, all outputs must be turned off on all series-connected units before AC power is turned off on any of the units. Always turn the outputs on and off together.
Page 81: Series Diode Considerations
The diode drop will vary depending on output current and temperature. If using the series diode is not acceptable in your application, please contact Keysight Technologies to speak to a power product support engineer for assistance. Keysight N6900/N7900 Series Operating and Service Guide...
Page 82: Capacitance Limits
2 Installing the Instrument Capacitance Limits The following table describes the maximum load capacitance that can be tolerated in a series configuration. If you suspect that your load capacitance exceeds these values, you must install the series diode as previously described. 1 kW Models Maximum load capacitance with 2 units 2 kW Models...
Page 83: Power Dissipator Connections
2 Installing the Instrument Power Dissipator Connections The N7909A Power Dissipator Power Cable Fabrication Power Dissipator Connections - 1 kW Units Power Dissipator Connections - 2 kW Units The N7909A Power Dissipator The N7909A power dissipator is required to provide 100% of the rated current-sink capability of the APS models.
Page 84: Power Dissipator Connections - 1 Kw Units
2 Installing the Instrument Keep wire size between AWG 10 (6 mm 2 ) maximum and AWG 14 (2.5 mm 2 ) minimum. Wires must carry currents of up to 15 A. Strip wire insulation back 15 mm. Push the wire straight into the oval opening (1). Observe polarity. Twist or bundle the wires to reduce noise.
Page 85: Power Dissipator Connections - 2 Kw Units
2 Installing the Instrument Power Dissipator Connections - 2 kW Units If you are using only one power dissipator with your 2 kW power supply, it does not matter if you are connecting to the upper or lower connectors. In this case, you will only be able to dissipate up to 1 kW of output power.
Page 86: Interface Connections
2 Installing the Instrument Interface Connections GPIB Connections USB Connections LAN Connections - site and private Digital Port Connections This section describes how to connect to the various communication interfaces on your APS. For further information about configuring the remote interfaces, refer to Remote Interface Configuration.
Page 87: Lan Connections - Site And Private
2 Installing the Instrument 1. Connect your instrument to the USB port on your computer. 2. With the Connection Expert utility of the Keysight IO Libraries Suite running, the computer will auto- matically recognize the instrument. This may take several seconds. When the instrument is recog- nized, your computer will display the VISA alias, IDN string, and VISA address.
Page 88: Digital Port Connections
2 Installing the Instrument 1. Connect the instrument to the site LAN or to your computer using a LAN cable. The as-shipped instrument LAN settings are configured to automatically obtain an IP address from the network using a DHCP server (DHCP is set On). The DHCP server will register the instrument’s hostname with the dynamic DNS server.
Page 89: Rack Mounting
2 Installing the Instrument Rack Mounting This section contains information for installing an N7907A Rack Mount Kit. This rack mount kit allows the 1 kW and 2 kW power supplies as well as the power dissipator to be mounted in a 19-inch EIA rack cabinet.
Page 90 2 Installing the Instrument Rack Mounting Keysight N6900/N7900 Series Operating and Service Guide...
Page 91: Black Box Recorder
2 Installing the Instrument Black Box Recorder This procedure only applies to instruments with serial number prior to MY59100101 (refer to Firmware Updates). On units with later serial numbers MY59100101 and up, the BBR function is integrated on the processor board and can only be ordered as a factory-installed Option BBR.
Page 92: Getting Started
Keysight N6900/N7900 Series Operating and Service Guide Getting Started Using the Front Panel Remote Interface Configuration...
Page 93: Using The Front Panel
3 Getting Started Using the Front Panel Turn the Unit On Set the Output Voltage Set the Output Current Set Over-voltage Protection Enable the Output Use Built-in Help System Turn the Unit On Verify that the line cord is connected and plugged in. Turn the unit on with the front panel power switch.
Page 94: Set The Output Current
3 Getting Started In the following display, the voltage setting is selected. Enter a value using the numeric keypad. Then press Select. You can also use the numeric arrow keys to adjust the value up or down. Values become effective when the output is turned on.
Page 95: Set Over-Voltage Protection
3 Getting Started You can also use the numeric arrow keys to adjust the value up or down. You can set both positive and negative current values. Values become effective when the output is turned on. In current priority mode, the unit will maintain the output current at its programmed setting. In voltage priority mode, the unit will limit the output current when it reaches the specified current limit value.
Page 96: Enable The Output
3 Getting Started Menu example - accessing over-voltage protection. Press the Menu key to access the front panel command menu. The first line identifies the menu path. When the menu is first accessed, the menu is at the top or root, and the path is empty. The second line indicates the commands that are available at the present menu level.
Page 97: Use Built-In Help System
3 Getting Started For a description of the status indicators, refer to Front Panel Display at a Glance. Use Built-in Help System View the list of help topics. Press the Help key to view the list of available help topics. To scroll through the list, press the up and down navigation arrows.
Page 98: Remote Interface Configuration
3 Getting Started Remote Interface Configuration USB Configuration GPIB Configuration LAN Configuration Modifying the LAN Settings Using the Web Interface Using Telnet Using Sockets Interface Lockout Introduction This instrument supports remote interface communication over three interfaces: GPIB, USB, and LAN. All three interfaces are "live"...
Page 99: Lan Configuration
3 Getting Started Front Panel Menu Reference SCPI Command Select System\IO\GPIB. Not available Use the numeric keys to enter a new value from 0 to 30. Then press Enter. LAN Configuration The following sections describe the primary LAN configuration functions on the front-panel menus. Note that there are no SCPI commands to configure the LAN parameters.
Page 100: Modifying The Lan Settings
3 Getting Started Front Panel Menu Reference SCPI Command Select System\IO\LAN\Reset Not available Select System\IO\LAN\Defaults Select Reset. Selecting Reset activates the selected LAN settings and restarts networking. Modifying the LAN Settings IP Address Select IP to configure the addressing of the instrument. Press the Menu key, then select System\IO\LAN\Config\IP.
Page 101 3 Getting Started Host Name A hostname is the host portion of the domain name, which is translated into an IP address. To configure the hostname of the instrument: Front Panel Menu Reference SCPI Command Select System\IO\LAN\Modify\Name Not available You can enter any value from the numeric keypad. For additional characters, use the up/down navigation keys to enter an alpha character by scrolling through the selection list that appears when you press the keys.
Page 102 3 Getting Started Dot-notation addresses ("nnn.nnn.nnn.nnn" where "nnn" is a byte value from 0 to 255) must be expressed with care, as most PC web software interprets byte values with leading zeros as octal (base 8) numbers. For example, "192.168.020.011" is actually equi- valent to decimal "192.168.16.9"...
Page 103: Using The Web Interface
3 Getting Started Using the Web Interface Your APS has a built-in Web interface that lets you control it directly from the Web browser on your computer. With the Web interface, you can access the front panel control functions including the LAN configuration parameters.
Page 104: Using Telnet
3 Getting Started Using Telnet In an MS-DOS Command Prompt box type: telnet hostname 5024 where hostname is the APS hostname or IP address, and 5024 is the instrument’s telnet port. You should get a Telnet session box with a title indicating that you are connected to the power supply. Type the SCPI commands at the prompt.
Page 105: Using The Advanced Power System
Keysight N6900/N7900 Series Operating and Service Guide Using the Advanced Power System Programming the Output Programming Output Protection Programming Output Transients (Step, List, Arb) Sequencing the Output Making Measurements Using Expression Signal Routing Programming the Digital Port External Data Logging (Elog) Black Box Data Recording Current Sharing Operation Current Sinking Operation...
Page 106: Programming The Output
4 Using the Advanced Power System Programming the Output Set the Output Priority Mode Set the Output Voltage Set the Output Current Set the Slew Rate Enable the Output Set the Output Bandwidth Set the Output Resistance Configure the Output Relays When the APS is first turned on, it may take about 30 seconds or so to initialize the instrument before it is ready for use.
Page 107: Set The Output Current
4 Using the Advanced Power System Front Panel Menu Reference SCPI Command Press the Voltage key. To set the output voltage to 40 volts: VOLT 40 Enter a value and press Select. When the unit is in current priority mode, you can specify a voltage limit which limits the output voltage at the specified value.
Page 108: Set The Output Bandwidth
4 Using the Advanced Power System Max slew rate ( V⁄s) = (Current limit setting (A) – Load current (A))/(Load capacitance (F)) The current slew rate determines the rate at which the current changes to a new programmed setting. This applies to both current settings in current priority mode, and current limit settings in voltage priority mode.
Page 109: Set The Output Resistance
4 Using the Advanced Power System 1 kW Models High limit Low limit 2 kW Models High limit Low limit N6950A/N7950A 0 to 3800 µF 0 to 190,000 µF N6970A/N7970A 0 to 7600 µF 0 to 380,000µF N6951A/N7951A 0 to 1000 µF 0 to 50,000 µF N6971A/N7971A 0 to 2000 µF...
Page 110: Configure The Output Relays
4 Using the Advanced Power System Front Panel Menu Reference SCPI Command Press the On/Off key. OUTP ON|OFF In addition to the front panel and SCPI Output On and Output Off commands, you can also use OnCouple, OffCouple, and expression signals to enable and disable the output.
Page 111 4 Using the Advanced Power System AC Filter Network Model N7950A 10 µF 0.3 µF 0.15 Ω N7951A 3.3 µF 0.2 µF 0.25 Ω N7952A 2.2 µF 0.1 µF 0.3 Ω N7953A 1 µF 0.047 µF 0.5 Ω N7954A 0.47 µF 0.047 µF 0.5 Ω...
Page 112: Programming Output Protection
4 Using the Advanced Power System Programming Output Protection Set the Over-Voltage Protection Set the Over-Current Protection Output Watchdog Timer User-Defined Protection Clear Output Protection Functions Protection Shutdown Behavior Introduction The APS models have many protection functions. These functions disable the output to protect the device under test as well as the power supply.
Page 113: Set The Over-Voltage Protection
4 Using the Advanced Power System Set the Over-Voltage Protection The over-voltage protection will turn the output off if the output voltage reaches the programmed over-voltage limit. The OVP circuit monitors the voltage at the + and – sense terminals. Note that an OVP shutdown will automatically occur if the + and –...
Page 114: Output Watchdog Timer
4 Using the Advanced Power System Front Panel Menu Reference SCPI Command Select Protect\OCP To specify a 10 millisecond delay: CURR:PROT:DEL 0.01 Enter a delay value. Then press Select. To start the delay timer by an output settings change: By default, the delay timer will be started by an output CURR:PROT:DEL:STAR SCH settings change.
Page 115: User-Defined Protection
4 Using the Advanced Power System User-Defined Protection User-defined protection lets you expand the built-in protection capabilities of the APS to include additional output behavior and status conditions. This is accomplished by programming a user-defined signal expression and routing it to the protection circuit of the unit. See Using Expression Signal Routing.
Page 116 4 Using the Advanced Power System N7976A, N7977A models and Due to the higher voltage capability of these models, they are equipped with N6976A, N6977 models with relay a fast solid-state disconnect switch (< 5 µs turn-off time) in series with the options galvanic relays.
Page 117: Programming Output Transients
4 Using the Advanced Power System Programming Output Transients Common Actions for All Transients Programming a Step Transient Programming a List Transient Programming an Arbitrary Waveform Output Transients An output transient is defined as a triggered action that causes a change in output voltage or current. The three available transient types are: step, list, and arbitrary waveforms.
Page 118 4 Using the Advanced Power System Enable the output transient function First, you must enable the output to respond to transient triggers. Unless an output transient function enabled, nothing will happen even if you have programmed the transient parameters and generated a transient trigger.
Page 119 4 Using the Advanced Power System Front Panel Menu Reference SCPI Command Select Transient\TrigSource. To select Bus triggers: TRIG:TRAN:SOUR BUS To select immediate triggers, select Imm. To select digital pin 5 as the trigger: To select Bus triggers, select Bus. TRIG:TRAN:SOUR PIN5 To select digital pin 5 as the trigger, select Pin 5, or EXT.
Page 120: Programming A Step Transient
4 Using the Advanced Power System As previously discussed, a trigger can also be generated by a digital pin, or a user-defined expression. If any of these systems are configured as the trigger source, the instrument will wait indefinitely for the trigger signal.
Page 121: Programming A List Transient
4 Using the Advanced Power System Programming a List Transient Program the list values Program the dwell values Specify the list pacing Specify any trigger signals that the list should generate Specify how many times you want the list to repeat Specify how you want the list to end Lists let you generate complex sequences of output changes with rapid, precise timing, which may be synchronized with internal or external signals.
Page 122 4 Using the Advanced Power System Front Panel Menu Reference SCPI Command Select Transient\List\Config. To program the amplitude for step 0 (the pulse) and step 1 (the off time): Select List Step 0 (the pulse) and enter a voltage value of LIST:VOLT 15,0 15.
Page 123 4 Using the Advanced Power System Front Panel Menu Reference SCPI Command Select Transient\List\Config. To program the dwell for step 0 (the pulse) and step 1 (the off time): Select List Step 0 (the pulse) and enter a dwell value of 1. LIST:DWEL 1,2 Press Select.
Page 124 4 Using the Advanced Power System Specify any trigger signals that the list should generate You can generate trigger signals that can be routed to other destinations. See Using Expression Signal Routing. For example you can use trigger signals to trigger actions on any external equipment connected to the digital port.
Page 125: Programming An Arbitrary Waveform
4 Using the Advanced Power System Programming an Arbitrary Waveform Specify the Arb type and dwell Configure the Arb Specify how many times you want the Arb to repeat Specify how you want the Arb to end Certain output amplitude and frequency combinations can exceed the instrument's dynamic response capability and cause the output to shut down, especially under no-load conditions.
Page 126 4 Using the Advanced Power System Front Panel Menu Reference SCPI Command Select Transient\Arb\Config. To program 10 points in a current Arb: ARB:CURR:CDW 1,2,2,3,4,4,3,2,2,1 If Arb points have been imported or programmed using the SCPI command, the Points field displays the To query the number of Arb points: number of points in the Arb.
Page 127: Sequencing The Output
4 Using the Advanced Power System Sequencing the Output This section describes how you can synchronize output turn-on and turn-off sequences on single and multiple units. Turn-On/Turn-Off Behavior Turn-On/Turn-Off Delays Enabling/Disabling the Output Sequencing Multiple Units Turn-On Turn-Off Behavior The following figure illustrates the output turn-on and output turn-off sequence followed by a description of the individual components.
Page 128: Turn-On/Turn-Off Delays
4 Using the Advanced Power System 7. For models without relays, the output is turned off immediately. For models with relays, there is an additional 18 millisecond wait for the output relays to open before the output is turned off. To circumvent the additional relay turn on/off delays, a non-volatile OUTPut:RELay:LOCK command can be sent, after which the delays will mirror those...
Page 129: Sequencing Multiple Units
4 Using the Advanced Power System As shown in the figure, you can configure digital ports pins 3 through 7 to provide the OnCouple and OffCouple signals that enable or disable the output. The output is enabled or disabled when the corresponding signal is true.
Page 130 4 Using the Advanced Power System Specify the Turn-On and Turn-Off Delays for each Unit Turn-on delays can be specified for all coupled units. Any delay sequence can be implemented. There are no restrictions on what the sequence is or what unit comes up first. Front Panel Menu Reference SCPI Command Select Output\Sequence\Couple.
Page 131 4 Using the Advanced Power System The common delay offset assures that the user-programmed turn-on delays will be synchronized to start at the completion of the common delay offset. Query the delay offset of each unit and use the slowest delay as the common delay offset. Front Panel Menu Reference SCPI Command Select Output\Sequence\Couple.
Page 132: Making Measurements
4 Using the Advanced Power System Making Measurements Average Measurements Number of Power Line Cycles (NPLC) Measurement Windowing Seamless Current Measurement Ranging Amp-Hour and Watt-Hour Measurements Temperature Measurements Digitized Measurements Measurement Triggering Average Measurements The APS models have a fully integrated voltmeter and ammeter to measure the actual voltage and current that is being supplied to the load.
Page 133: Measurement Windowing
4 Using the Advanced Power System Front Panel Menu Reference SCPI Command To set the number of power line Select Measure\NPLC cycles to 10 use: SENS:SWE:NPLC 10 Select Measure\Sweep Enter the number of power line cycles in the NPLC field. Then press Select. The AC line frequency is detected automatically for the SENSe:SWEep:NPLC command.
Page 134: Amp-Hour And Watt-Hour Measurements
4 Using the Advanced Power System Front Panel Menu Reference SCPI Command Select Measure\Range. To set the 2.5 A range: SENS:CURR:RANG 2.5 Select the low (or high) measurement range from the current dropdown menu. Then press Select. Program any value up to the highest rating of the range.
Page 135: Digitized Measurements
4 Using the Advanced Power System Digitized Measurements In addition to the average voltage, current, and power measurements, which are available from both the front panel and via SCPI commands, digitized measurements can also be returned. Digitized measurements differ from average measurements because you can select the type of measurement returned and fine tune the measurement quality.
Page 136 4 Using the Advanced Power System To measure the minimum value: MEAS:VOLT:MIN? MEAS:CURR:MIN? To take a measurement and return array data: MEAS:ARR:VOLT? MEAS:ARR:CURR? MEAS:ARR:POW? Measurement Quality The following figure illustrates the relationship between measurement samples (or points), and the time interval between samples in a typical measurement. You can fine tune the measurement by specifying the number of points in the measurement acquisition as well as the time interval between points.
Page 137: Measurement Triggering
4 Using the Advanced Power System Measurement Triggering Capture pre-trigger data, if desired Select the trigger source Initiate the acquisition system Trigger the measurement Fetch the measurement Multiple trigger events per measurement Use the acquisition trigger system to synchronize measurements with a trigger signal from the selected trigger source.
Page 138 4 Using the Advanced Power System To offset the beginning of the acquisition buffer relative to the acquisition trigger: Front Panel Menu Reference SCPI Command Select Measure\Sweep. To offset the measurement by 100 points use: SENS:SWE:OFFS:POIN 100 Enter an Offset value. Then press Select. When the value is 0, all measurement samples are taken after the trigger.
Page 139 4 Using the Advanced Power System Use the following commands to select a trigger source: Front Panel Menu Reference SCPI Command Not available To select Bus triggers: TRIG:TRAN:SOUR BUS To select digital pin 5 as the trigger: TRIG:ACQ:SOUR PIN5 To select a voltage or current level: TRIG:ACQ:SOUR VOLT1 TRIG:ACQ:SOUR CURR1 To select an output transient as trigger:...
Page 140 4 Using the Advanced Power System Front Panel Menu Reference SCPI Command Not available To generate a measurement trigger: TRIG:ACQ Alternatively, if the trigger source is BUS, you can also program a *TRG or an IEEE-488 <get> command. As previously discussed, a trigger can also be generated by an output transient, a digital pin, and output voltage or current level, or a user-defined expression.
Page 141 4 Using the Advanced Power System If a FETCh query is sent before the measurement is finished, the response will be delayed until the measurement trigger occurs and the acquisition completes. You can test the MEAS_active bit in the operation status register to know when the measurement trigger system has returned to the idle state.
Page 142: Using Expression Signal Routing
4 Using the Advanced Power System Using Expression Signal Routing This section describes how expressions can be used to program signal routing. You can also use the Power Assistant software to program signal routing. For an overview of how the expression signals are mapped into the trigger system, refer to Trigger Overview.
Page 143: Defining Signal Expressions
4 Using the Advanced Power System Defining Signal Expressions Use the following command to define signal expressions: Front Panel Menu Reference SCPI Command Select System\Signal\Define. To define signal expression number 1: SYST:SIGN:DEF EXPR1,"expression" Select an expression number (1 to 8) in the dropdown list. Existing expressions will be displayed in the text field.
Page 144 4 Using the Advanced Power System The following table describes the available signal sources. The Type column describes the signal; an event generates a pulse; a state generates a level. Signal Source Type Description Thr<1-4> state Output of the SENSe:THReshold<1|2|3|4> comparators WtgAcqTrig The instrument is wating for the acquisition trigger state...
Page 145: Configuring Threshold Comparators
4 Using the Advanced Power System Operator/Operation Description And, Or, Not Boolean operations Parentheses for grouping and nesting sub-expressions Delay <sub-expression>, Delays the signal described by expression. Suppresses positive pulses < time>,[<de-glitch>] narrower than the de-glitch time parameter. Delays range from 0 to 167 seconds with these ranges: 0 to 0.02097 s with 1.28 us resolution 0.02097 to 0.167 s with 10.24 us resolution 0.167 to 1.677 s with 102.4 us resolution...
Page 146: Specifying Signal Expression Targets
4 Using the Advanced Power System Specifying Signal Expression Targets Signal expressions can be used to control digital port pins, specify trigger sources, control the OnCouple/OffCouple signals, create user-defined protection functions, and generate user-defined status signals. Digital Port Pins To control digital port pins using expressions (see Programming the Digital Port): Front Panel Menu Reference...
Page 147: Expression Constraints
4 Using the Advanced Power System User-Defined Protection To set the user-defined protection source using expressions (see Programming Output Protection): Front Panel Menu Reference SCPI Command Select System\Signal\Protect. To set user-defined protection: OUTP:PROT:USER:SOUR EXPR<1-8> Select the expression that will set the user-defined protection from the Source dropdown list.
Page 148: Expression Examples
4 Using the Advanced Power System Front Panel Menu Reference SCPI Command Select System\Signal\Define. Program the signal expression. SYST:SIGN:DEF EXPR1, "Delay(CV,1) Or CC Or DigPin1" Select Expression 1 in the dropdown list. Enter "Delay(CV,1) Or CC Or DigPin1" in the text field. In the following expression, because the delay is ORed with one sub-expression, the maximum number of remaining available expressions is six.
Page 149 4 Using the Advanced Power System Example 2 Create a trigger source that will trigger an output transient (step or list) whenever the output current is between 2.1 A and 2.7 A: Front Panel Menu Reference SCPI Command Select System\Signal\Threshold. Program the threshold comparators.
Page 150 4 Using the Advanced Power System Example 4 Create a trigger source that triggers a measurement 50 milliseconds after the output has settled.. Front Panel Menu Reference SCPI Command Select System\Signal\Define. Program the signal expression. SYST:SIGN:DEF EXPR4, "Delay Select Expression 4 in the dropdown list. (OutpSettled,0.05)"...
Page 151: Programming The Digital Port
4 Using the Advanced Power System Programming the Digital Port Bi-Directional Digital I/O Digital Input only Expression Output External Trigger I/O Fault Output Inhibit Input Fault/Inhibit System Protection Output Couple Digital Control Port A Digital Control Port consisting of seven I/O pins is provided to access various control functions. Each pin is user-configurable.
Page 152: Bi-Directional Digital I/O
4 Using the Advanced Power System TINPut A trigger input pin can be selected as the source for measurement and transient trigger signals. See TRIGger:ACQuire:SOURce TRIGger:TRANsient:SOURce TOUTput A trigger output pin will generate output triggers from any subsystem that has been configured to output trigger signals.
Page 153: Digital Input
4 Using the Advanced Power System To configure the pins for digital I/O: Front Panel Menu Reference SCPI Command Select System\IO\DigPort\Pins. To select the pin function: DIG:PIN<1-7>:FUNC DIO Select a pin in the Pin field. To select pin polarity: In the Function field, select Dig IO. DIG:PIN<1-7>:POL POS In the Polarity field, select either Positive or Negative.
Page 154: External Trigger I/O
4 Using the Advanced Power System External Trigger I/O Each of the seven pins can be configured as trigger inputs or trigger outputs. The polarity of the pins can also be configured. When you program trigger polarity, POSitive means a rising edge and NEGative means a falling edge.
Page 155: Inhibit Input
4 Using the Advanced Power System Inhibit Input Pin 3 can be configured as a remote inhibit input. The Inhibit Input function lets an external input signal control the output state of instrument. The input is level triggered. The signal latency is 5 microseconds.
Page 156: Output Couple Control
4 Using the Advanced Power System Clearing a System Protection Fault To restore all instruments to a normal operating condition when a fault condition occurs in a daisy- chained system protection configuration, two fault conditions must be removed: 1. The initial protection fault or external Inhibit signal. 2.
Page 157 4 Using the Advanced Power System In this example, pin 6 is configured as the output On control. Pin 7 is configured as the output Off control. The ground or Common pins are connected together. Front Panel Menu Reference SCPI Command Select System\IO\DigPort\Pins.
Page 158: External Data Logging (Elog)
4 Using the Advanced Power System External Data Logging (Elog) Select the Measurement Function and Range Specify the Integration Period Select the Elog Trigger Source Initiate and Trigger the Elog Periodically Retrieve the Data Terminate the Elog External Data Logging The external data logging function can only be programmed using SCPI commands.
Page 159: Specify The Integration Period
4 Using the Advanced Power System Front Panel Menu Reference SCPI Command Not available To enable voltage or current measurements: SENS:ELOG:FUNC:VOLT ON SENS:ELOG:FUNC:CURR ON To enable min/max measurements: SENS:ELOG:FUNC:VOLT:MINM ON SENS:ELOG:FUNC:CURR:MINM ON Keysight N7900 models have two current measurement ranges, a high and a low range (see specifications ). A seamless current ranging function ensures that no data is lost due to range switching. Seamless ranging is enabled by default. The commands to enable seamless current...
Page 160: Select The Elog Trigger Source
4 Using the Advanced Power System Select the Elog Trigger Source The TRIGger:ELOG command generates an immediate trigger regardless of the trigger source. Unless you are using this command, select a trigger source from the following: Trigger Description Source Selects GPIB device trigger, *TRG, or <GET> (Group Execute Trigger). External Selects ANY pin that is configured as a Trigger Input on the digital control port.
Page 161: Periodically Retrieve The Data
4 Using the Advanced Power System Periodically Retrieve the Data Each FETCh command returns number of requested records of the data in the buffer and removes them, making room available for more data. The Elog continues until it is aborted. An Elog record is one set of voltage and current readings for one time interval.
Page 162: Black Box Data Recording
4 Using the Advanced Power System Black Box Data Recording Black Box Recorder Logged Data BBR Status BBR Period BBR Length Snapshot Operation Snapshot Event Tags BBR Clock Setup BBR Alignment Black Box Recorder The N7908A Black Box Recorder is an option that performs continuous background logging of output voltage, current, power, and system status to its own dedicated mass storage device.
Page 163: Logged Data
4 Using the Advanced Power System Logged data is preserved after a power cycle. A time-stamped event is logged each time power is turned on. Logged Data The following output measurements are automatically logged per data record: Average voltage Average current Average power Maximum voltage Maximum current...
Page 164: Snapshot Operation
4 Using the Advanced Power System Snapshot Operation It is good practice to verify the system date and time before retrieving Black Box data. Refer to Clock Setup. You can retrieve logged data by requesting a "snapshot" either from the front panel or using SCPI commands.
Page 165: Bbr Clock Setup
4 Using the Advanced Power System BBR Clock Setup The real-time clock is used to time-stamp the BBR, which is its only function. When shipped, the real- time clock is set to Greenwich mean time. To set the clock: Front Panel Menu Reference SCPI Command Select System\Preferences\Display\Clock.
Page 166 4 Using the Advanced Power System can read and send the time to the instrument. By sending this event tag to several units, you can create a common event tag to align all BBR records. Method 3- Send a digital pulse into a digital input pin on the rear of the power supply (see Digital Input).
Page 167: Introduction
4 Using the Advanced Power System Current Sharing Operation Enable the Current Sharing Function Program the On Couple and Off Couple Function Program the Output Voltage and Current Program a Step Function for Additional Output Changes Enable the Output and Trigger the Additional Output Changes Specification Effects Current Sharing Effects Introduction...
Page 168: Enable The Current Sharing Function
4 Using the Advanced Power System To determine the total load current, you must sum the output current readings of the individual par- alleled units. Equipment Damage Always turn the AC power on and off together. Never leave any units powered on while the others are off. If AC power is turned on or off on a single coupled unit, the outputs of the remaining units that are still powered on will be enabled and will transition to their programmed settings.
Page 169: Program The Output Voltage And Current
4 Using the Advanced Power System Program pin 6 as the On Couple pin; program pin 7 as the Off Couple pin. This setting is saved in non volatile memory. Front Panel Menu Reference SCPI Command Select System\IO\DigPort\Pins To set pin 6 as the On Couple: DIG:PIN6:FUNC ONC Select pin 6, then Function, then On Couple.
Page 170: Program A Step Function For Additional Output Changes
4 Using the Advanced Power System N T is the total number of paralleled units of any rating N 2kW is the total number of paralleled 2 kW units *If there are no 2kW units used, then N 2kW = 0. Note that in a mixed power configuration, you must set the current limit of the 2 kW units to twice the value of the 1 kW units.
Page 171: Enable The Output And Trigger Additional Output Changes
4 Using the Advanced Power System Front Panel Menu Reference SCPI Command Select Transient\Step In Voltage priority mode: VOLT:TRIG <value> Select either the Trig Voltage or the Trig Current box and In Current priority mode: enter the step value. CURR:TRIG <value> Designate the "master"...
Page 172: Specification Effects
4 Using the Advanced Power System Front Panel Menu Reference SCPI Command Push the Output key on the “master” (Unit 1) On the “master” (Unit 1): OUTP ON Initiate the transient systems on all units. Front Panel Menu Reference SCPI Command Select Transient\Control Initiate the transient trigger system: INIT:TRAN...
Page 173: Current Sharing Effects
4 Using the Advanced Power System Example: You have two 80 V units connected in parallel. The load regulation effect due to current sharing is 2.4 mV from the table above. The CV load regulation specification is 2 mV. Therefore, the total output voltage regulation effect is 2 mV + 2.4 mV, or 4.4 mV.
Page 174: Current Sinking Operation
4 Using the Advanced Power System Current Sinking Operation Power Dissipator Operation Querying the Power Dissipator Current Sinking Current sinking, also referred to as down-programming, is the ability to pull current into the positive terminal of the DC power supply. For example, the power supply pulls or sinks current into the positive terminal whenever a lower output voltage is programmed.
Page 175: Power Dissipator Operation
4 Using the Advanced Power System Power Dissipator Operation Power supply models rated at 1 kW, require one Keysight N7909A power dissipator to sink 100% of their rated current. Power supply models rated at 2 kW, require two Keysight N7909A power dissipators to sink 100% of their rated current.
Page 176 4 Using the Advanced Power System If the negative current limit query returns a value that equals 10% of the rated current of the power supply, the power dissipator is not recognized by the power supply. Turn the power supply off, make sure that the power dissipator is properly connected, and turn the power supply on again.
Page 177: System-Related Operations
4 Using the Advanced Power System System-Related Operations Though not directly related to output programming, the following functions also control instrument operation. Instrument Identification Instrument State Storage Front Panel Display Front Panel Lock-Out Password Protection Instrument Identification You can query the model number, serial number, options, and firmware revision. SCPI commands return information with the *IDN? and *OPT? queries.
Page 178: Front Panel Display
4 Using the Advanced Power System Front Panel Display The power supply has a front panel screen saver that significantly increases the life of the LCD display by turning it off during periods of inactivity. The delay can be set from 30 to 999 minutes in 1 minute increments.
Page 179: Password Protection
4 Using the Advanced Power System Front Panel Menu Reference SCPI Command Select System\Preferences\Lock Not available In the dialog box, enter the password to unlock the front panel. Then select Lock. The menu to unlock the front panel appears every time a key is pressed.
Page 180: Voltage Priority
4 Using the Advanced Power System Priority Mode Tutorial Voltage Priority In voltage priority mode the output is controlled by a constant-voltage feedback loop, which maintains the output voltage at its programmed setting as long as the load current remains within the positive or negative current limit settings.
Page 181: Current Priority
4 Using the Advanced Power System Current Priority In current priority mode the output is controlled by a bi-polar constant current feedback loop, which maintains the output source or sink current at its programmed setting. The output current will remain at its programmed setting as long as the load voltage remains within the voltage limit setting.
Page 182: Current Sharing Tutorial
4 Using the Advanced Power System Current Sharing Tutorial Current Sharing Calculations Sharing Deviation for Units of Equal Power (either 1 kW or 2 kW) Sharing Deviation for Units of Mixed Power (1 kW paralleled with 2 kW) This section describes how to calculate the current sharing effects of paralleled units of equal and mixed power.
Page 183: Sharing Deviation For Units Of Equal Power (Either 1 Kw Or 2 Kw)
4 Using the Advanced Power System Sharing Deviation for Units of Equal Power (either 1 kW or 2 kW) The following table gives the Gain and Offset values for paralleled units of equal power: Paralleled Units (N T ) Gain Error % (G) Offset Error % (K) Gain and Offset Equations 0.200...
Page 184 4 Using the Advanced Power System Example (300 A load current) You have three 9V units connected in parallel. Two of the units are 1kW units with a rated current of 100A. The other is a 2kW unit with a rated current of 200A. The load draws 300A of current.
Page 185: Using The Power Assistant Software
Keysight N6900/N7900 Series Operating and Service Guide Using the Power Assistant Software Introduction Using the Meter View Black Box Data Recording Configuring Signal Routing...
Page 186: Introduction
5 Using the Power Assistant Software Introduction This section explains how to use the Keysight N7906A Power Assistant software. Requirements: Keysight N6900/N7900 Series Advanced Power System Windows 8 (32-bit and 64-bit) Windows 7 SP1 (32-bit and 64-bit) Windows XP SP3 (32-bit) Keysight IO Libraries Suite (version 16.3 or later) Microsoft .NET Framework 4 (standalone installer) Adobe Reader - for viewing the documentation...
Page 187: Using The Meter View
5 Using the Power Assistant Software Using the Meter View The Meter tab displays the front panel of the instrument that you are connected to. You can control the instrument from this window much that same way that you use the actual front panel of the instrument.
Page 188 5 Using the Power Assistant Software When you expand the front panel controls, the following additional controls appear. These access the same controls that are available from the actual front panel of the instrument. Keysight N6900/N7900 Series Operating and Service Guide...
Page 189: Configuring Signal Routing
5 Using the Power Assistant Software Configuring Signal Routing This section explains how to use the Power Assistant to configure signal routing. Routing Signals Downloading the Routing Saving the Routing File Viewing the SCPI Commands Source Icon Descriptions Operator Icon Descriptions Target Icon Descriptions Signal Routing Examples Routing Signals...
Page 190: Downloading The Routing
5 Using the Power Assistant Software Downloading the Routing When you have completed the signal routing, you must download it to the instrument. Click Instrument Panel if the instrument to which you are connected, does not appear in the win- dow.
Page 191: Saving The Routing File
5 Using the Power Assistant Software Saving the Routing File You can save and retrieve routing files on your computer. Click the Disc icon on top of the window to save the file. The default file location is C:\Program Files\Keysight\PowerAssistant. Rename the file, as the default filename is overwritten each time a new file is saved.
Page 192: Source Icon Descriptions
5 Using the Power Assistant Software Source Icon Descriptions Status When the signal is true Threshold Level comparators generate a Icons Icons true signal based on the comparison of two inputs The output is regulating in constant voltage mode The measured voltage level comparison The output is in positive current limit...
Page 193: Operator Icon Descriptions
5 Using the Power Assistant Software Transient When the signal is true Acquisition When the signal is true Icons Icons Pulses true when a trigger out sig- The acquisition is initiated or in pro- nal occurs (by a step or list) gress The instrument is waiting for the transient trigger...
Page 194: Target Icon Descriptions
5 Using the Power Assistant Software Target Icon Descriptions Output When the signal is true User When the signal is true Icons Icons Turns the output state on Selects the User1 status bit Turns the output state off Selects the User2 status bit Digital Digital output pins can gen- Protection...
Page 195 5 Using the Power Assistant Software 3. Select the OR operator from the Operator list to place it onto the work area. 4. Move the CL- and CL+ icons toward the inputs of the Operator icon until the solid yellow con- nection lines appear.
Page 196 5 Using the Power Assistant Software Example 3 Create a custom protection that will disable the output if the output voltage moves outside the window between 23.5 V and 24.5 V. 1. Select the Threshold icon from the Source list to place it onto the work area. Select Voltage, > dir- ection, and enter a 24.5 level in the Level dropdown list.
Page 197 5 Using the Power Assistant Software Example 4 Create a trigger source that triggers a measurement 50 milliseconds after the output has settled. 1. Select the Output icon from the Source list to place it onto the work area. Select Settled from the Output dropdown list.
Page 198: Black Box Data Recording
5 Using the Power Assistant Software Black Box Data Recording This section explains how to use the Power Assistant to retrieve and view data from the Black Box Recorder. Making a Snapshot Retrieving the Snapshot Viewing the Snapshot Configuring the Display Viewing the Snapshot Exporting the Snapshot Data Saving the Snapshot File...
Page 199: Viewing The Snapshot
5 Using the Power Assistant Software Viewing the Snapshot The Black Box tab displays the snapshot data file that you retrieved from the instrument. The snapshot always uploads from the most recent data entry on back. The following figure illustrates a sample snapshot file: Note the following areas of interest: 1.
Page 200: Viewing Snapshot Events
5 Using the Power Assistant Software Click Configuration to configure the snapshot view. Click the items that you wish to appear on the display. Scroll down to view all of the items in the list. In the following example, six items are selected. This matches what is shown in the previous figure.
Page 201: Exporting The Snapshot Data
5 Using the Power Assistant Software Exporting the Snapshot Data You can export the snapshot data to an Excel or CSV file. Select Export to export the snapshot data. Select Microsoft Excel to export the data to Excel. Select CSV to save the data in .csv format. The default file location is C:\Program Files\Keysight\PowerAssistant.
Page 202: Scpi Programming Reference
Keysight N6900/N7900 Series Operating and Service Guide SCPI Programming Reference Introduction to the SCPI Language Commands by Subsystem Command Quick Reference Reset State (*RST) SCPI Error Messages Compatibility Commands IO Libraries and Instrument Drivers The Keysight IO Libraries Suite software is provided on the Keysight Automation Ready CD-ROM provided with your instrument.
Page 203: Introduction To The Scpi Language
6 SCPI Programming Reference Introduction to the SCPI Language Keywords Queries Command Separators and Terminators Syntax Conventions Parameter Types Device Clear Typical Command Processing Times Introduction This instrument complies with the rules and conventions of the present SCPI version (see SYSTem:VERSion?).
Page 204: Keywords
6 SCPI Programming Reference Keywords Keywords, also referred to as headers, are instructions recognized by the instrument. Common commands are also keywords. OUTPut is the root keyword, DELay is a second-level keyword, FALL and RISE are third-level keywords. Colons ( : ) separate the keyword levels. The command syntax shows most commands (and some parameters) as a mixture of upper- and lower-case letters.
Page 205: Syntax Conventions
6 SCPI Programming Reference Semicolons ( ; ) separate commands within the same subsystem. This lets you send several subsystem commands within the same message string. For example, sending the following command string: OUTPut:STATe ON;DELay:RISE 1;FALL 2 is the same as sending the following commands: OUTPut ON OUTPut:DELay:RISE 1 OUTPut:DELay;FALL 2...
Page 206: Parameter Types
6 SCPI Programming Reference Square brackets ( [ ]) enclose some syntax elements - nodes and parameters for example. This indicates that the element is optional and can be omitted. The brackets are not sent with the com- mand string. In the case of an optional parameter, if you do not specify a value for an optional para- meter the instrument will ignore the parameter.
Page 207: Device Clear
6 SCPI Programming Reference ASCII String Parameters String parameters can contain virtually any set of ASCII characters. A string must begin and end with matching quotes; either with a single quote or a double quote. You can include the quote delimiter as part of the string by typing it twice without any characters in between.
Page 208 6 SCPI Programming Reference Setting Commands GPIB Set the output voltage: VOLT <n> 0.5 ms 2.5 ms Set the unit to the reset state: *RST 10.5 ms 11.5 ms Query Commands Return the voltage setting: VOLT? 1.3 ms 5 ms Return the output setting: OUT? 1 ms 5.5 ms...
Page 209: Commands By Subsystem
6 SCPI Programming Reference Commands by Subsystem ABORt CALibrate DISPlay FETCh FORMat HCOPy IEEE-488 Common INITiate MEASure OUTPut SENSe [SOURce:] CURRent DIGital FUNCtion LIST POWer RESistance STEP VOLTage STATus SYSTem TRIGger Status Tutorial Trigger Tutorial Keysight N6900/N7900 Series Operating and Service Guide...
Page 210: Abort Subsystem
6 SCPI Programming Reference ABORt Subsystem Abort commands cancel any triggered actions and returns the trigger system back to the Idle state. Abort commands are also executed with the *RST command. ABORt:ACQuire ABORt:ELOG ABORt:TRANsient ABORt:ACQuire - Cancels any triggered measurements. It also resets the WTG-meas and MEAS- active bits in the Operation Status registers.
Page 211: Arb Subsystem
6 SCPI Programming Reference ARB Subsystem ARB commands program the constant-dwell arbitrary waveforms. Constant-dwell waveforms can have up to 65,535 points assigned to them, with the same dwell time for each point. [SOURce:] ARB :COUNt <value>|INFinity Specifies the number of times the Arb repeats. :CURRent :CDWell [:LEVel] <value>{,<value>}|<Block>...
Page 212 6 SCPI Programming Reference Current and voltage Arbs share settings, so setting the current Arb resets the voltage Arb level to its default value and vice versa. For better performance, the list can be sent as single precision floating point values in definite length arbitrary block format instead of an ASCII list. The response format is dependent on the return format ASCII or REAL.
Page 213 6 SCPI Programming Reference [SOURce:]ARB:FUNCtion:TYPE CURRent|VOLTage [SOURce:]ARB:FUNCtion:TYPE? Specifies either a voltage or current Arb. Only one type of Arb may be output at a time. The selection must match the priority mode. Parameter Typical Return CURRent|VOLTage, *RST VOLTage VOLT or CURR Specifies a voltage Arb: ARB:FUNC:TYPE VOLT [SOURce:]ARB:TERMinate:LAST 0|OFF|1|ON [SOURce:]ARB:TERMinate:LAST?
Page 214: Calibrate Subsystem
6 SCPI Programming Reference CALibrate Subsystem Calibrate commands calibrate the instrument. Read the calibration section before calibrating. Improper calibration reduces accuracy and reliability. CALibrate :COUNt? Returns the number of times the unit has been calibrated. :CURRent [:LEVel] <value> Calibrates the current programming and measurement. :MEASure <value>...
Page 215 6 SCPI Programming Reference CALibrate:CURRent:MEASure <value> Calibrates the low range current measurement. The value selects the range to calibrate. Parameter Typical Return The maximum current of the measurement range. (none) Calibrates the current of the 10 A measurement range: CAL:CURR:MEAS 10 CALibrate:CURRent:SHARing Calibrates the Imon signal for paralleled units.
Page 216 6 SCPI Programming Reference Parameter Typical Return <"date"> String program data. <last cal date> Enters the calibration date: CAL:DATE "12/12/12" CALibrate:LEVel P1|P2|P3 CALibrate:LEVel? Advances to the next level in the calibration. P1 is the first level; P2 is the second; P3 is the third. Parameter Typical Return P1|P2|P3...
Page 217 6 SCPI Programming Reference CALibrate:SAVE Saves the calibration constants in non-volatile memory. Do this at the end of the calibration to avoid losing changes. Parameter Typical Return (none) (none) Store calibration constants into non-volatile memory: CAL:SAVE CALibrate:STATe 0|OFF|1|ON [,<password>] CALibrate:STATe? Enables or disables calibration mode.
Page 218: Current Subsystem
6 SCPI Programming Reference CURRent Subsystem Current commands program the output current of the instrument. [SOURce:] CURRent [:LEVel] [:IMMediate] [:AMPLitude] <value> Sets the output current when in current priority mode :TRIGgered [:AMPLitude] <value> Sets the triggered output current :LIMit [:POSitive] [:IMMediate] [:AMPLitude] <value>...
Page 219 6 SCPI Programming Reference [SOURce:]CURRent:LIMit[:POSitive][:IMMediate][:AMPLitude] <value>|MIN|MAX [SOURce:]CURRent:LIMit[:POSitive][:IMMediate][:AMPLitude]? [MIN|MAX] [SOURce:]CURRent:LIMit:NEGative[:IMMediate][:AMPLitude] <value>|MIN|MAX [SOURce:]CURRent:LIMit:NEGative[:IMMediate][:AMPLitude]? [MIN|MAX] Sets the current limit when in voltage priority mode. Units are in amperes. The maximum value depends on the current rating of the unit. The minimum value is the most negative value. Parameter Typical Return Positive: 0 to 102% of rating, *RST 1.02% of rating...
Page 220 6 SCPI Programming Reference [SOURce:]CURRent:PROTection:DELay:STARt SCHange|CCTRans [SOURce:]CURRent:PROTection:DELay:STARt? Specifies what starts the over-current protection delay timer. SCHange starts the over-current delay whenever a command changes the output settings. CCTRans starts the over-current delay timer by any transition of the output into current limit mode. Parameter Typical Return SCHange|CCTRans, *RST SCHange...
Page 221 6 SCPI Programming Reference [SOURce:]CURRent:SLEW[:IMMediate] <value>|MIN|MAX|INFinity [SOURce:]CURRent:SLEW[:IMMediate]? [MIN|MAX] Sets the current slew rate. The slew rate is set in amps per second and affects all programmed current changes, including those due to the output state turning on or off. The slew rate can be set to any value between 0 and 9.9E+37.
Page 222: Digital Subsystem
6 SCPI Programming Reference DIGital Subsystem Digital commands program the digital control port on the rear panel of the instrument. [SOURce:] DIGital :INPut :DATA? Reads the state of the digital control port. :OUTPut :DATA <value> Sets the state of the digital control port. :PIN<1-7>...
Page 223 6 SCPI Programming Reference [SOURce:]DIGital:PIN<1-7>:FUNCtion <function> [SOURce:]DIGital:PIN<1-7>:FUNCtion? Sets the function of the pins. The functions are saved in non-volatile memory. General-purpose ground-referenced digital input/output function. DINPut Digital input-only mode. EXPRession<1-8> A user-defined expression drives the pin. FAULt Pin 1 functions as an isolated fault output. Pin 2 is common for pin INHibit Pin 3 functions as an inhibit input.
Page 224 6 SCPI Programming Reference Parameter Typical Return 0|OFF|1|ON, *RST OFF 0 or 1 Enable BUS triggered signals on the digital pins: CURR:TOUT:BUS ON The query returns 0 (OFF) if the trigger signal will NOT be generated with a BUS trigger command, and 1(ON) if a trigger signal will be generated with a BUS trigger command. Keysight N6900/N7900 Series Operating and Service Guide...
Page 225: Display Subsystem
6 SCPI Programming Reference DISPlay Subsystem Display commands control the front panel display. DISPlay[:WINDow][:STATe] 0|OFF|1|ON DISPlay[:WINDow][:STATe]? Turns the front panel display on or off. Parameter Typical Return 0|OFF|1|ON, *RST ON 0 or 1 Turns the front panel display off: DISP OFF DISPlay[:WINDow]:VIEW METER_VI|METER_VP|METER_VIP DISPlay[:WINDow]:VIEW? Selects the parameters to display on the front panel. ...
Page 226: Fetch Subsystem
6 SCPI Programming Reference FETCh Subsystem Fetch commands return measurement data that has been previously acquired. FETCh queries do not generate new measurements, but allow additional measurement calculations from the same acquired data. The data is valid until the next MEASure or INITiate command occurs. FETCh [:SCALar] :CURRent...
Page 227 6 SCPI Programming Reference FETCh[:SCALar]:CURRent[:DC]? [<start_index>, <points>] FETCh[:SCALar]:VOLTage[:DC]? [<start_index>, <points>] FETCh[:SCALar]:POWer[:DC]? [<start_index>, <points>] Returns the averaged measurement. Values returned are either in amperes, volts, or watts. Optional parameters specify a subset starting at <startindex> and of length <points>. Parameter Typical Return [<startindex>] the start index <DC value>...
Page 228 6 SCPI Programming Reference FETCh[:SCALar]:CURRent:MAXimum? FETCh[:SCALar]:VOLTage:MAXimum? FETCh[:SCALar]:POWer:MAXimum? FETCh[:SCALar]:CURRent:MINimum? FETCh[:SCALar]:VOLTage:MINimum? FETCh[:SCALar]:POWer:MINimum? Returns the maximum or minimum value. Values returned are either in amperes, volts, or watts. Parameter Typical Return (none) <MIN value> or <MAX value> Returns the measured maximum current FETC:CURR:MAX? Returns the measured maximum voltage FETC:VOLT:MAX? Returns the measured minimum power FETC:POW:MIN? FETC:POW:MIN? and FETC:POW:MAX? are only available on units with firmware revisions...
Page 229 6 SCPI Programming Reference Parameter Typical Return [<startindex>] the start index <value> [,<value>] [<points>] the number of points or <Block> Returns the measured current array FETC:ARR:CURR? Returns the measured voltage array FETC:ARR:VOLT? Returns the measured power array FETC:ARR:POW? FETCh:ELOG? <maxrecords> Returns the most recent external datalog records.
Page 230: Format Subsystem
6 SCPI Programming Reference FORMat Subsystem FORMat commands specify the format for transferring measurement data. FORMat[:DATA] ASCII|REAL FORMat[:DATA]? Specifies the format of the returned data. This is used by queries that can return a block of data. ASCII returns data as ASCII bytes in numeric format as appropriate. The numbers are separated by commas.
Page 231: Function Command
6 SCPI Programming Reference FUNCtion Command [SOURce:]FUNCtion CURRent|VOLTage [SOURce:]FUNCtion? Sets the output regulation - voltage priority or current priority. In voltage priority mode the output is controlled by a constant voltage feedback loop, which maintains the output voltage at its programmed setting.
Page 232: Hcopy Subsystem
6 SCPI Programming Reference HCOPy Subsystem HCOPy commands return the display image. HCOPy:SDUMp:DATA? [BMP|GIF|PNG] Returns an image of the front panel display. The format may be specified by the optional parameter. If no format is specified, the format is determined by HCOPy:SDUMp:DATA:FORMat. The response is a SCPI 488.2 definite length binary block of the form: #<nonzero digit><digits><8 bit data-bytes>...
Page 233: Ieee-488 Common Commands
6 SCPI Programming Reference IEEE-488 Common Commands IEEE-488 Common commands generally control overall instrument functions, such as reset, status, and synchronization. All common commands consist of a three-letter mnemonic preceded by an asterisk: *RST *IDN? *SRE 8. *CLS Clear status command. *ESE <value>...
Page 234 6 SCPI Programming Reference Parameter Typical Return A decimal value corresponding to the <bit value> binary-weighted sum of the register's bits. Enable bits 3 and 4 in the enable register: *ESE 24 The value returned is the binary-weighted sum of all bits set in the register. For example, to enable bit 2 (decimal value = 4), bit 4 (decimal value = 16), the corresponding decimal value would be 20 (4 + 16).
Page 235 6 SCPI Programming Reference Parameter Typical Return (none) ASCII string with semicolon-separated fields Returns the learn string: *LRS? *OPC Sets the OPC (operation complete) bit in the standard event register. This occurs at the completion of the pending operation. Refer to Status Tutorial for more information.
Page 236 6 SCPI Programming Reference *RCL <0-9> Recalls a saved instrument state. This restores the instrument to a state that was previously stored in locations 0 through 9 with the *SAV command. All instrument states are recalled except: (1) trigger systems are set to the Idle state, (2) calibration is disabled, (3) all list settings are set to their *RST values, and (4) non-volatile settings are not affected.
Page 237 6 SCPI Programming Reference *SRE <value> *SRE? Service request enable command and query. This sets the value of the Service Request Enable register. This determines which bits from the Status Byte Register are summed to set the Master Status Summary (MSS) bit and the Request for Service (RQS) summary bit. A 1 in any Service Request Enable register bit position enables the corresponding Status Byte register bit.
Page 238 6 SCPI Programming Reference Parameter Typical Return (none) 0 (pass) or +1 (failed) Perform self-test: *TST? The power-on self-test is the same self-test performed by *TST. *TST? also forces an *RST command. *WAI Pauses additional command processing until all pending operations are complete. See for more information.
Page 239: Initiate Subsystem
6 SCPI Programming Reference INITiate Subsystem Initiate commands initialize the trigger system. This moves the trigger system from the "idle" state to the "wait-for- trigger" state; which enables the instrument to receive triggers. An event on the selected trigger source causes the trigger to occur. INITiate[:IMMediate]:ACQuire INITiate[:IMMediate]:ELOG INITiate[:IMMediate]:TRANsient...
Page 240: List Subsystem
6 SCPI Programming Reference LIST Subsystem List commands program an output sequence of multiple voltage or current settings. A comma- delimited list of up to 512 steps may be programmed. Note that these commands only apply in the presently active priority mode, either voltage priority or current priority. [SOURce:] LIST :COUNt <value>|INFinity...
Page 241 6 SCPI Programming Reference [SOURce:]LIST:CURRent[:LEVel] <value>{,<value>} [SOURce:]LIST:CURRent[:LEVel]? [SOURce:]LIST:VOLTage[:LEVel] <value>,{<value [SOURce:]LIST:VOLTage[:LEVel]? Specifies the setting for each list step. Values are specified in either amperes or volts. Parameter Typical Return Voltage: 0 to 102% of rating <list value 1>, Current: -10.2% to 102% of rating <list value 2>, Current with power dissipator: up to -102% to 102% of rating <list value 3>...
Page 242 6 SCPI Programming Reference Parameter Typical Return (none) <points> Returns the number of points in the dwell list: LIST:DWEL:POIN? [SOURce:]LIST:STEP ONCE|AUTO [SOURce:]LIST:STEP? Specifies how the list responds to triggers. ONCE causes the output to remain at the present step until a trigger advances it to the next step.
Page 243: Lxi Command
6 SCPI Programming Reference LXI Command LXI:IDENtify[:STATe] 0|OFF|1|ON LXI:IDENtify[:STATe]? Turns the front panel LXI identify indicator on or off. When turned on, the "LAN" status indicator on the front panel blinks on and off to identify the instrument that is being addressed. Parameter Typical Return 0|OFF|1|ON, *RST OFF...
Page 244: Measure Subsystem
6 SCPI Programming Reference MEASure Subsystem Measure commands measure the output voltage or current. They trigger the acquisition of new data before returning the reading. Measurements are performed by digitizing the instantaneous output voltage or current for a specified measurement time, storing the results in a buffer, and calculating the value for the specified measurement type.
Page 245 6 SCPI Programming Reference Parameter Typical Return (none) <DC value> Returns the measured DC current MEAS:CURR? Returns the measured DC voltage MEAS:VOLT? Returns the measured DC power MEAS:POW? MEASure[:SCALar]:CURRent:ACDC? MEASure[:SCALar]:VOLTage:ACDC? Initiates, triggers, and returns the total RMS measurement (AC + DC). Values returned are either in amperes, or volts.
Page 246 6 SCPI Programming Reference MEASure[:SCALar]:CURRent:MAXimum? MEASure[:SCALar]:VOLTage:MAXimum? MEASure[:SCALar]:POWer:MAXimum? MEASure[:SCALar]:CURRent:MINimum? MEASure[:SCALar]:VOLTage:MINimum? MEASure[:SCALar]:POWer:Minimum? Initiates, triggers, and returns the maximum or minimum values of a measurement. Values returned are either in amperes, volts, or watts. Parameter Typical Return (none) <MIN value>, <MAX value> Returns the measured maximum current MEAS:CURR:MAX? Returns the measured maximum voltage MEAS:VOLT:MAX? Returns the measured minimum power MEAS:POW:MIN? MEAS:POW:MIN? and MEAS:POW:MAX? are only available on units with firmware revisions...
Page 247: Output Subsystem
6 SCPI Programming Reference OUTPut Subsystem The Output subsystem controls the output state, power-on, protection, and relay functions. OUTPut [:STATe] 0|OFF|1|ON Enables or disables the output. :COUPle [:STATe] 0|OFF|1|ON Enables or disables output coupling. :DOFFset <value> Sets a delay offset to synchronize coupled output state changes.
Page 248 6 SCPI Programming Reference OUTPut [:STATe] 0|OFF|1|ON OUTPut[STATe]? Enables or disables the output. The state of a disabled output is a condition of zero output voltage and zero source current. If output and sense relays are installed, the relays will open when the output is disabled and close when the output is enabled.
Page 249 6 SCPI Programming Reference Parameter Typical Return 0 to 1.023 <delay value> Specifies a delay of 60 milliseconds: OUTP:COUP:DOFF 0.06 OUTPut[:STATe]:COUPle:MAX:DOFFset? Returns the delay offset required for this instrument. As a minimum, the OUTPut:COUPle:DELay:OFFSet value must be set to the maximum delay offset returned for any coupled output.
Page 250 6 SCPI Programming Reference Note that both Rise and Fall commands use the same resolution; which is determined by whichever delay time (fall or rise) is the longest. Parameter Typical Return 0 - 1023, *RST 0 <delay value> Sets a delay of 0.5 s before turning the output on: OUTP:DEL:RISE 0.5 Each APS model exhibits a minimum delay offset that applies from the time that a command to turn on the output is received until the output actually turns on.
Page 251 6 SCPI Programming Reference If the power-on state is set to 0 with no state stored, a self-test error "file not found; 0 state" is gen- erated and the instrument is set to the *RST state. OUTPut:PROTection:CLEar Resets the latched protection. This clears the latched protection status that disables the output when a protection condition occurs (see Programming Output Protection).
Page 252 6 SCPI Programming Reference OUTPut:PROTection:USER[:STATe] 0|OFF|1|ON OUTPut:PROTection:USER[:STATe]? Enables or disables the user-defined protection. Parameter Typical Return 0|OFF|1|ON, *RST OFF 0 or 1 Enables the user-defined protection: OUTP:PROT:USER ON OUTPut:PROTection:USER:SOURce EXPRession<1-8>|NONE OUTPut:PROTection:USER:SOURce? Sets the user-defined protection source to an expression. When an expression is specified, the output is disabled if the expression is true.
Page 253 6 SCPI Programming Reference OUTPut:RELay:LOCK[:STATe]0|OFF|1|ON OUTPut:RELay:LOCK[:STATe]? Enables or disables the locked-closed state of the output relays. When locked, the output relays remain closed and do not change with the output state. This improves the output response time for applications that do not require a physical output disconnect. This parameter is saved in non-volatile memory.
Page 254: Power Query
6 SCPI Programming Reference POWer Query [SOURce:]POWer:LIMit? [MIN|MAX] Returns the output power limit of the instrument. AC mains circuits rated at 100-120 VAC cannot supply enough current to power either the 1 kW or the 2 kW models when operated at their full rated output power. Use this query to return the maximum output power available when connected to 100-120 VAC mains.
Page 255: Resistance Subsystem
6 SCPI Programming Reference RESistance Subsystem Resistance commands program the output resistance. These commands are superseded by [SOURce:]VOLTage:RESistance[:LEVel][:IMMediate][:AMPLitude] and [SOURce:]VOLTage:RESistance:STATe in later versions of the firmware (refer to Firmware Updates). The following commands will be accepted, but the new ones are recommended for new applications.
Page 256: Sense Subsystem
6 SCPI Programming Reference SENSe Subsystem Sense commands control the current measurement ranges and window as well as the data acquisition sequence. SENSe :AHOur :RESet Resets the amp-hour or watt-hour measurement to zero. :BBR :PERiod <value> Sets the recording period of the black box recorder in seconds. :CURRent [:DC] :RANGe...
Page 257 6 SCPI Programming Reference :POWer [:LEVel] <value> Sets the power level for comparator 1,2,3, or 4. :VOLTage [:LEVel] <value> Sets the voltage level for comparator 1,2,3, or 4. :WHOur [:LEVel] <value> Sets the watt-hour level for comparator 1,2,3, or 4. :WHOur :RESet Resets the accumulated watt-hour measurement.
Page 258 6 SCPI Programming Reference SENSe:CURRent[:DC]:RANGe:AUTO 0|OFF|1|ON SENSe:CURRent[:DC]:RANGe:AUTO? Enables or disables seamless measurement auto ranging. Parameter Typical Return 0|OFF|1|ON, *RST ON 0 or 1 Enable current measurement autoranging: SENS:CURR:RANG:AUTO ON SENSe:ELOG:CURRent[:DC]:RANGe[:UPPer] <value>|MIN|MAX SENSe:ELOG:CURRent[:DC]:RANGe[:UPPer]? [MIN|MAX] Selects the Elog current measurement range. The value that you enter must be the highest value that you expect to measure. ...
Page 259 6 SCPI Programming Reference SENSe:ELOG:FUNCtion:CURRent:MINMax 0|OFF|1|ON SENSe:ELOG:FUNCtion:CURRent:MINMax? SENSe:ELOG:FUNCtion:VOLTage:MINMax 0|OFF|1|ON SENSe:ELOG:FUNCtion:VOLTage:MINMax? Enables or disables logging of the minimum and maximum current or voltage values. Parameter Typical Return 0|OFF|1|ON, *RST OFF 0 or 1 Enables MIN/MAX logging values: SENS:ELOG:FUNC:VOLT:MINM ON SENSe:ELOG:PERiod <value>|MIN|MAX SENSe:ELOG:PERiod? [MIN|MAX] Sets the integration time of an Elog measurement.
Page 260 6 SCPI Programming Reference SENSe:SWEep:OFFSet:POINts <value>|MIN|MAX SENSe:SWEep:OFFSet:POINts? [MIN|MAX] Defines the offset in a data sweep for triggered measurements. Positive values represent the delay after the trigger occurs but before the samples are acquired. Negative values represent data samples taken prior to the trigger. Parameter Typical Return –524,287 to 2,000,000,000, *RST 0...
Page 261 6 SCPI Programming Reference Parameter Typical Return AHOur|CURRent|POWer|VOLTage|WHOur, AHO, CURR, POW, VOLT, or WHO *RST VOLTage Selects the power function for comparator 1: SENS:THR1:FUNC POW SENSe:THReshold<1|2|3|4>:OPERation GT|LT SENSe:THReshold<1|2|3|4>:OPERation? Sets the operation type for comparator 1,2,3 or 4. GT (greater than) specifies that the signal will be true if the measurement is greater than the threshold level.
Page 262 6 SCPI Programming Reference SENSe:WINDow[:TYPE] HANNing|RECTangular SENSe:WINDow[:TYPE]? Selects the measurement window. This sets a signal conditioning function used in scalar DC measurement calculations. Neither window function alters the instantaneous voltage or current data returned in the measurement array. Hanning window is a "raised cosine" function. It is a signal conditioning function that reduces errors in DC measurement calculations in the presence of periodic signals such as AC line ripple.
Page 263: [Source] Subsystem
6 SCPI Programming Reference [SOURce] Subsystem The SOURce keyword is optional in many commands that set parameters for a source or output, such as [SOURce:]CURRent <value>. Because SOURce subsystem commands are often used without the optional SOURce keyword, these commands are listed by their individual subsystems, below: Subsystems and Commands Using the Optional [SOURce:] Keyword CURRent DIGital...
Page 264: Status Subsystem
6 SCPI Programming Reference STATus Subsystem Status register programming lets you determine the operating condition of the instrument at any time. The instrument has three groups of status registers; Operation, Questionable, and Standard Event. The Operation and Questionable status groups each consist of the Condition, Enable, and Event registers as well as NTR and PTR filters.
Page 265 6 SCPI Programming Reference STATus:OPERation:CONDition? Queries the condition register for the Operation Status group. This is a read-only register, which holds the live (unlatched) operational status of the instrument. Reading the Operation Status Condition register does not clear it. Parameter Typical Return (none) <bit value>...
Page 266 6 SCPI Programming Reference When a bit in the PTR register is set to 1, then a 0-to-1 transition of the corresponding bit in the Operation Condition register causes that bit in the Operation Event register to be set. STATus:PRESet sets all bits in the PTR registers and clears all bits in the NTR registers. Parameter Typical Return A decimal value corresponding to the binary-weighted sum of...
Page 267 6 SCPI Programming Reference STATus:QUEStionable<1|2>[:EVENt]? Queries the event register for the Questionable Status group. This is a read-only register, which stores (latches) all events that are passed by the Operation NTR and/or PTR filter. Reading the Questionable Status Event register clears it. Parameter Typical Return (none)
Page 268 6 SCPI Programming Reference For example, to enable bit 2 (decimal value = 4), bit 4 (decimal value = 16), the corresponding decimal value would be 20 (4 + 16). *CLS does not clear the enable register, but does clear the event register.
Page 269: Step Command
6 SCPI Programming Reference STEP Command [SOURce:]STEP:TOUTput 0|OFF|1|ON [SOURce:]STEP:TOUTput? Specifies whether a trigger out is generated when a transient step occurs. A trigger is generated when the state is on (true). Parameter Typical Return 0|OFF|1|ON , *RST OFF 0 or 1 Sets the step trigger signal to ON: STEP:TOUT ON Keysight N6900/N7900 Series Operating and Service Guide...
Page 270: System Subsystem
6 SCPI Programming Reference SYSTem Subsystem System commands control system functions that are not directly related to output control, measurement, or status functions. Note that IEEE-488 Common commands also control system functions such as self-test, saving and recalling states, and others. SYSTem :BBR :EVENt <"string">...
Page 271 6 SCPI Programming Reference SYSTem:BBR:SNAPshot <time> Captures a data snapshot of the specified length. The length is specified in seconds. The snapshot captures the most recent data going back from the time the snapshot command is received. The data is stored in an internal file where it can be retrieved with the software application. Subsequent snapshot commands will overwrite the existing snapshot file.
Page 272 6 SCPI Programming Reference SYSTem:COMMunicate:LAN:CONTrol? SYSTem:COMMunicate:TCPip:CONTrol? Returns the initial socket control connection port number. This connection is used to send and receive commands and queries. Unlike the data socket, which uses a fixed port number, the control socket port number varies and must be obtained using these queries. Parameter Typical Return (none)
Page 273 6 SCPI Programming Reference SYSTem:ERRor? Reads and clears one error from the error queue. Parameter Typical Return (none) <+0,"No error"> Reads and clear first error in error queue: SYST:ERR? The front-panel ERR annunciator turns on when one or more errors are currently stored in the error queue.
Page 274 6 SCPI Programming Reference Parameter Typical Return AUTO|MAN50|MAN60 AUTO, MAN50, or MAN60 Sets the line frequency mode to 60 Hz: SYST:LFR:MODE MAN60 SYSTem:PASSword:FPANel:RESet Resets the front panel lockout password to zero. This command does not reset the calibration password. Parameter Typical Return (none) (none)
Page 275 6 SCPI Programming Reference SYSTem:SIGNal:DEFine EXPRession<1-8>, <"expression"> SYSTem:SIGNal:DEFine? EXPRession<1-8> Defines up to eight signal expressions. Refer to Define Signal Expressions for a complete list of signal sources and operators that are used to "build" each signal expression. Parameter Typical Return EXPRession<1-8>...
Page 276: Trigger Subsystem
6 SCPI Programming Reference TRIGger Subsystem Trigger commands control the transient and acquisition subsystems. Refer to Trigger Overview more information. TRIGger :ACQuire [:IMMediate] Generates an immediate trigger. :CURRent [:LEVel] <value> Sets the triggered level of the output. :SLOPe POSitive|NEGative Sets the slope of the signal. :INDices [:DATA]? Returns the indices where triggers were captured.
Page 277 6 SCPI Programming Reference TRIGger:ACQuire:CURRent[:LEVel] <value>|MIN|MAX TRIGger:ACQuire:CURRent[:LEVel]? [MIN|MAX] TRIGger:ACQuire:VOLTage[:LEVel] <value>|MIN|MAX TRIGger:ACQuire:VOLTage[:LEVel]? [MIN|MAX] Sets the triggered level of the output. Applies when the measurement trigger source is set to a level. Values are specified in either amperes or volts. The minimum and maximum values depend on the ratings of the unit.
Page 278 6 SCPI Programming Reference Parameter Typical Return (none) <time> Return the number of triggers: TRIG:ACQ:IND:COUN? TRIGger:ACQuire:TOUTput[:ENABle] 0|OFF|1|ON TRIGger:ACQuire:TOUTput[:ENABle]? Enables measurement triggers to be sent to a digital port pin. The digital port pin must be configured as trigger output before it can be used as a trigger source (see External Trigger I/O).
Page 279 6 SCPI Programming Reference Parameter Typical Return BUS | EXTernal | IMMediate | EXPRession<1-8>| PIN<1- BUS, EXT, IMM, EXPR<n>, PIN<n> 7> *RST BUS Select digital port pin 1 as the Arb trigger source: TRIG:ARB:SOUR PIN1 TRIGger:ELOG:SOURce <source> TRIGger:ELOG:SOURce? Selects the trigger source for external data logging: Selects a remote interface trigger command.
Page 280: Voltage Subsystem
6 SCPI Programming Reference VOLTage Subsystem Voltage commands program the output voltage of the instrument. [SOURce:] VOLTage [:LEVel] [:IMMediate] [:AMPLitude] <value> Sets the output voltage when in voltage priority mode. :TRIGgered [:AMPLitude] <value> Sets the triggered output voltage. :BWIDth LOW|HIGH1 Sets the voltage bandwidth.(for backward compatibility) :LEVel 0|1, <value>...
Page 281 6 SCPI Programming Reference [SOURce:]VOLTage:BWIDth LOW|HIGH1 [SOURce:]VOLTage:BWIDth? Sets the voltage bandwidth. This lets you optimize output response time with capacitive loads. These compensation modes only apply when the unit is operating in voltage priority mode. HIGH1 provides maximum up-programming speed as well as the fastest transient response time when the output capacitance is restricted to small values.
Page 282 6 SCPI Programming Reference [SOURce:]VOLTage:LIMit[:POSitive][:IMMediate][:AMPLitude] <value>|MIN|MAX [SOURce:]VOLTage:LIMit[:POSitive][:IMMediate][:AMPLitude]? [MIN|MAX] Sets the voltage limit when in current priority mode. Units are in volts. Parameter Typical Return 0.1% to 102% of rating, *RST 1% of rating <voltage limit> Sets the voltage limit to 20 V: VOLT:LIM 20 [SOURce:]VOLTage:MODE FIXed|STEP|LIST|ARB [SOURce:]VOLTage:MODE? Sets the transient mode.
Page 283 6 SCPI Programming Reference Parameter Typical Return 0 to 6.4 Ω (model dependent)|MIN|MAX, *RST 0 Specifies an output resistance of 0.5 ohms: VOLT:RES 0.5 [SOURce:]VOLTage:RESistance:STATe 0|OFF|1|ON [SOURce:]VOLTage:RESistance:STATe? Enables or disables output resistance programming in voltage priority mode. Parameter Typical Return 0|OFF|1|ON, *RST OFF 0 or 1 Turns resistance programming on: VOLT:RES:STAT ON [SOURce:]VOLTage:SLEW[:IMMediate] <value>|MIN|MAX|INFinity...
Page 284 6 SCPI Programming Reference The [SOURce:]VOLTage:SLEW:MAX command is coupled to the [SOURce:]VOLTage:SLEW com- mand. If [SOURce:]VOLTage:SLEW sets the rate to MAX or INFinity, [SOURce:]VOLTage:SLEW:MAX is enabled. If the slew rate is set to any other value, [SOURce:]VOLTage:SLEW:MAX is disabled. Keysight N6900/N7900 Series Operating and Service Guide...
Page 285: Status Tutorial
6 SCPI Programming Reference Status Tutorial This section provides a detailed description of the individual registers and register groups. The status diagram provides an graphical view of how the status registers and groups are interconnected. Status Registers Operation Status Group Questionable Status Group Standard Event Status Group Status Byte Register...
Page 286: Questionable Status Group
6 SCPI Programming Reference Bit Name Decimal Definition Value Output is in constant voltage Output is in constant current Output is programmed off WTG-meas Measurement system is waiting for a trigger WTG-tran Transient system is waiting for a trigger MEAS-active Measurement system is initiated or in progress TRAN-active Transient system is initiated or in progress...
Page 287: Standard Event Status Group
6 SCPI Programming Reference PROT 2048 Output is disabled by a watchdog timer protection 4096 Output is disabled by excessive output dynamic protection 8192 A sense lead fault has been detected 14,15 not used not used 0 is returned The following table describes the Questionable2 assignments. Bit Name Decimal Value Definition...
Page 288: Status Byte Register
6 SCPI Programming Reference Status Byte Register This register summarizes the information from all other status groups as defined in the IEEE 488.2 Standard Digital Interface for Programmable Instrumentation. The following table describes the Status Byte register bit assignments. Bit Name Decimal Definition Value...
Page 289: Status Diagram
6 SCPI Programming Reference Status Diagram Keysight N6900/N7900 Series Operating and Service Guide...
Page 290: Trigger Tutorial
6 SCPI Programming Reference Trigger Tutorial The APS trigger system is a flexible, multi-purpose system that controls the operation of the instrument to suit a variety of user-defined applications. The trigger diagram below provides an graphical view of how the trigger sources and destinations are interconnected. Trigger Sources Trigger Destinations Trigger Diagram...
Page 291: Trigger Diagram
6 SCPI Programming Reference Destination Description Digital Pin Sends the trigger output signal to the designated digital output pin. See Pro- gramming the Digital Port. Elog Starts external data logging (Elog). Note that external data logging must first be initiated. See External Data Logging.
Page 292: Reset State (*Rst)
6 SCPI Programming Reference Reset State (*RST) The power-on/reset state may differ from that shown below if you have enabled power-on state recall mode from the States menu (see Instrument State Storage). The following table shows the reset state. These parameters are reset to the indicated values at power-on or after *RST.
Page 293 6 SCPI Programming Reference SCPI Command *RST Settings LIST:TOUTput:BOSTep 1 step set to OFF LIST:TOUTput:EOSTep 1 step set to OFF LIST:VOLTage 1 step set to 0.1% of rating LXI:IDENtify OUTPut OUTPut:DELay:FALL OUTPut:DELay:RISE OUTPut:PROTection:MODE LOWZ OUTPut:PROTection:USER OUTPut:PROTection:USER:SOURce NONE OUTPut:PROTection:WDOG OUTPut:PROTection:WDOG:DELay OUTPut:RELay:POLarity NORMal RESistance RESistance:STATe...
Page 294 6 SCPI Programming Reference SCPI Command *RST Settings SENSe:THReshold<n>:VOLTage SENSe:THReshold<n>:WHOur SENSe:WINDow RECTangular STEP:TOUTput TRIGger:ACQuire:CURRent TRIGger:ACQuire:CURRent:SLOPe POSitive TRIGger:ACQuire:SOURce TRIGger:ACQuire:TOUTput TRIGger:ACQuire:VOLTage TRIGger:ACQuire:VOLTage:SLOPe POSitive TRIGger:ARB:SOURce TRIGger:ELOG:SOURce TRIGger:TRANsient:SOURce VOLTage 0.1% of rating VOLTage:LIMit 1% of rating VOLTage:MODE FIXed VOLTage:PROTection 120% of rating VOLTage:SLEW VOLTage:SLEW:MAXimum VOLTage:TRIGgered 0.1% of rating The following table shows the as-shipped settings of the non-volatile parameters.
Page 295 6 SCPI Programming Reference SCPI as-shipped settings OUTPut:RELay:LOCK OUTPut:RELay:POLarity:ENABle SENSe:BBR:PERiod 0.01 SYSTem:LFRequency:MODE AUTO Front Panel as-shipped settings Front panel lockout password Disabled Firmware update password protected Disabled GPIB address GPIB interface Enabled LAN interface Enabled USB interface Enabled Screen saver Enabled Screen saver delay 60 minutes...
Page 296: Scpi Error Messages
6 SCPI Programming Reference SCPI Error Messages The Keysight instrument returns error messages in accord with the SCPI standard. Up to 20 errors can be stored in each interface-specific error queue (one each for GPIB, USB, VXI- 11, and Telnet/Sockets.) Errors appear in the error queue of the I/O session that caused the error. The front-panel ERR annunciator turns on when there are one or more errors are in the error queue.
Page 297 6 SCPI Programming Reference 104 Bad sequence of calibration commands Calibration commands have not been entered in the proper sequence. 105 Unexpected output current The measured output current is outside the acceptable range. 106 Zero measurement out of range error The “zero”...
Page 298 6 SCPI Programming Reference 206 File not found The internal calibration file or the internal channel attribute file was not found in NVRAM. 207 Cal file version error The calibration file was written or read using old firmware. Firmware must be updated. 208 Running backup firmware The instrument is presently running the backup (previous) version of the firmware.
Page 299 6 SCPI Programming Reference 309 Cannot initiate, voltage and current in fixed mode Cannot initiate transient generator. Either the voltage or current function is set to Fixed mode. 310 The command is not supported by this model This instrument either does not have the hardware capability or the options required to support this command.
Page 300 6 SCPI Programming Reference -111 Header separator error A character that was not a valid header separator was found in the command string. -112 Program mnemonic too long The header contains more than 12 characters. -113 Undefined header A command was received that was not valid for this instrument. -114 Header suffix out of range The value of the numeric suffix is not valid.
Page 301 6 SCPI Programming Reference -144 Character data too long The character data element contains more than 12 characters. -148 Character data not allowed A discrete parameter was received, but a string or numeric parameter was expected. -150 String data error Generic string data error -151 Invalid string data An invalid character string was received.
Page 302 6 SCPI Programming Reference -222 Data out of range A data element could not be executed because the value was outside the valid range. -223 Too much data A data element was received that contains more data than the instrument can handle. -224 Illegal parameter value An exact value was expected but not received.
Page 303 6 SCPI Programming Reference Query Errors (these errors set Standard Event Status register bit #2) -400 Query Error Generic error query -410 Query INTERRUPTED A condition causing an interrupted query error occurred. -420 Query UNTERMINATED A condition causing an unterminated query error occurred. -430 Query DEADLOCKED A condition causing a deadlocked query error occurred.
Page 304: Compatibility Commands
6 SCPI Programming Reference Compatibility Commands The commands described in this section are provided for compatibility with existing N6700 series modular power systems (MPS). Specifically, because of their feature sets, only programs written for the N673xB, N674xB, and N677xA power modules are directly compatible with the APS models. Note that the compatibility commands discussed in this section have no or little effect on the operation of the APS models, as they access functions that are either redundant or not available.
Page 305 6 SCPI Programming Reference N6700 MPS command Action on APS models OUTPut:COUPle:CHANnel Does nothing. Couples output channels together. OUTPut:PROTection:COUPle Does nothing. Couples protection on output channels. SENSe:CURRent:COMPensate Does nothing. Sets the output current compensation. SENSe:FUNCtion:CURRent Current measurements are always enabled. Enables current measurements.
Page 306: Commands And Parameters That Work Differently
6 SCPI Programming Reference Commands and Parameters that Work Differently STEP and LIST commands only apply to the priority mode that is presently active in the APS (either voltage-priority or current-priority mode). This is unlike the N6700 MPS commands, which can STEP and LIST voltage and current simultaneously.
Page 307: Verification And Calibration
Keysight N6900/N7900 Series Operating and Service Guide Verification and Calibration Recommended Test Equipment and Setups Performance Verification Calibration Procedure Test Record Forms...
Page 308: Recommended Test Equipment And Setups
7 Verification and Calibration Recommended Test Equipment and Setups Test Equipment Measurement Techniques Test Considerations Verification Setups Calibration Setups Test Equipment The test equipment recommended for the performance verification and adjustment procedures is listed below. If the exact instrument is not available, substitute calibration standards of equivalent accuracy.
Page 309: Measurement Techniques
7 Verification and Calibration Measurement Techniques Voltmeter To ensure that the values read by the voltmeter during both the verification procedure and the calibration procedure are not affected by the instantaneous measurement of the AC peaks of the output current ripple, make several DC measurements and average them. If you are using a Keysight 3458A DMM, you can set up the voltmeter to do this automatically.
Page 310: Verification Setups
7 Verification and Calibration Verification Setups Calibration Setups Keysight N6900/N7900 Series Operating and Service Guide...
Page 311: Performance Verification
If the instrument fails any of the tests or if abnormal test results are obtained, try calibrating the unit. If calibration is unsuccessful, return the unit to a Keysight Technologies Service Center. Refer to the...
Page 312: Constant Voltage Load Effect
7 Verification and Calibration Step 3. Record the output voltage reading from the DMM and the voltage measured over the interface. The readings should be within the limits specified in the test record form for the appropriate model under “Voltage Programming & Readback, Minimum Voltage”. Step 4.
Page 313: Transient Recovery Time
7 Verification and Calibration Step 4. Program the power system to the settings indicated in the in the test record form for the appropriate model under “CV Ripple and Noise” and enable the output. Let the oscilloscope run for a few seconds to generate enough measurement points.
Page 314: Current Programming And Readback Accuracy
7 Verification and Calibration Current Programming and Readback Accuracy This test verifies that the current programming and measurement functions are within specifications. Step 1. Turn off the power supply and connect the current shunt directly across the output terminals. Connect the DMM directly across the current shunt (see Test Setup B).
Page 315: Current Sink Capability Verification
7 Verification and Calibration Step 5. Short the electronic load. Divide the voltage drop (DMM reading) across the current shunt by the shunt resistance to convert to amps and record this value. The difference in the current readings in steps 4 and 5 is the load effect, which should not exceed the value listed in the test record for the appropriate model under “CC Load Effect”.
Page 316: Calibration Procedure
7 Verification and Calibration Calibration Procedure Calibration Interval Enter Calibration Mode Voltage Calibration Voltage Common Mode Rejection Ratio Calibration Current Calibration Current Temperature Coefficient Calibration Current Sharing Calibration Resistance Bottom-Out Calibration Enter a Calibration Date Save Calibration and Log Out Introduction The instrument features closed-case electronic calibration;...
Page 317: Calibration Interval
7 Verification and Calibration Calibration Interval Keysight Technologies recommends that complete verification should always be performed at the calibration interval. If the power supply passes the verification tests, the unit is operating within its calibration limits and does not need to be calibrated. This ensures that the instrument will remain within specifications for the next calibration interval and provides the best long-term stability.
Page 318: Voltage Common Mode Rejection Ratio Calibration
7 Verification and Calibration Step 4. Select the second voltage calibration point. Measure the output voltage with the DMM and enter the data. Front Panel Menu Reference SCPI Command Display shows: “Enter P2 measured data”. Enter the data CAL:LEV P2 from the external DMM. Press Enter when done. Press Back *OPC? to finish.
Page 319: Current Calibration
7 Verification and Calibration Step 4. Select the second current calibration point. Wait 5 minutes for the temperature to settle. Calculate the shunt current (I=V/R) and enter the data. Front Panel Menu Reference SCPI Command Display shows: “Enter P2 measured data”. Enter the data CAL:LEV P2 from the external DMM.
Page 320: Current Sharing Calibration
7 Verification and Calibration Front Panel Menu Reference SCPI Command Display shows: “Enter P2 measured data”. Enter the data from CAL:LEV P2 the external DMM. This should be about 70% of the full-scale *OPC? current rating. Press Enter when done. Press Back to finish. CAL:DATA <data>...
Page 321: Resistance Bottom-Out Calibration
7 Verification and Calibration Front Panel Menu Reference SCPI Command Select System\Admin\Cal\Misc\CurrShar. CAL:CURR:SHAR Check that the short is connected and select Next. Step 3. Select the first calibration point. Measure the voltage across the sharing connector and enter the data. Front Panel Menu Reference SCPI Command Display shows: “Enter P1 measured data”.
Page 322: Test Record Forms
7 Verification and Calibration Test Record Forms N6950A/N6970A N6950A/N6970A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 7.5 mV _______ + 10.5 mV Voltage measured over interface: Both Vout –...
Page 323: N6951A/N6971A
7 Verification and Calibration N6951A/N6971A N6951A/N6971A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 17 mV _______ + 23 mV Voltage measured over interface: Both Vout –...
Page 324: N6952A/N6972A
7 Verification and Calibration N6952A/N6972A N6952A/N6972A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 34 mV _______ + 46 mV Voltage measured over interface: Both Vout –...
Page 325: N6953A/N6973A
7 Verification and Calibration N6953A/N6973A N6953A/N6973A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 51 mV _______ + 69 mV Voltage measured over interface: Both Vout –...
Page 326: N6954A/N6974A
7 Verification and Calibration N6954A/N6974A N6954A/N6974A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 68 mV _______ + 92 mV Voltage measured over interface: Both Vout –...
Page 327: N6950A/N6970A With Option 301
7 Verification and Calibration N6950A/N6970A with Option 301 N6950A/N6970A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 8 mV _______ + 10 mV Voltage measured over interface: Both Vout –...
Page 328: N6951A/N6971A With Option 301
7 Verification and Calibration N6951A/N6971A with Option 301 N6951A/N6971A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 18 mV _______ + 22 mV Voltage measured over interface: Both Vout –...
Page 329: N6952A/N6972A With Option 301
7 Verification and Calibration N6952A/N6972A with Option 301 N6952A/N6972A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 36 mV _______ + 44 mV Voltage measured over interface: Both Vout –...
Page 330: N6953A/N6973A With Option 301
7 Verification and Calibration N6953A/N6973A with Option 301 N6953A/N6973A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 54 mV _______ + 66 mV Voltage measured over interface: Both Vout –...
Page 331: N6954A/N6974A With Option 301
7 Verification and Calibration N6954A/N6974A with Option 301 N6954A/N6974A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 72 mV _______ + 88 mV Voltage measured over interface: Both Vout –...
Page 332: N7950A/N7970A
7 Verification and Calibration N7950A/N7970A N7950A/N7970A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 8 mV _______ + 10 mV Voltage measured over interface: Both Vout –...
Page 333: N7951A/N7971A
7 Verification and Calibration N7951A/N7971A N7951A/N7971A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 18 mV _______ + 22 mV Voltage measured over interface: Both Vout –...
Page 334: N7952A/N7972A
7 Verification and Calibration N7952A/N7972A N7952A/N7972A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 36 mV _______ + 44 mV Voltage measured over interface: Both Vout –...
Page 335: N7953A/N7973A
7 Verification and Calibration N7953A/N7973A N7953A/N7973A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 54 mV _______ + 66 mV Voltage measured over interface: Both Vout –...
Page 336: N7954A/N7974A
7 Verification and Calibration N7954A/N7974A N7954A/N7974A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 72 mV _______ + 88 mV Voltage measured over interface: Both Vout –...
Page 337: N6976A
7 Verification and Calibration N6976A N6976A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): + 103 mV _______ + 137 mV Voltage measured over interface: Vout – 17 mV _______ Vout + 17 mV High voltage (Vout):...
Page 338: N6977A
7 Verification and Calibration N6977A N6977A Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): + 136 mV _______ + 184 mV Voltage measured over interface: Vout – 24 mV _______ Vout + 24 mV High voltage (Vout):...
Page 339: N7976A And N6976A With Option 301
7 Verification and Calibration N7976A and N6976A with Option 301 N7976A/N6976A Option 301 Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 109 mV _______ + 131 mV Voltage measured over interface: Both Vout –...
Page 340: N7977A And N6977A With Option 301
7 Verification and Calibration N7977A and N6977A with Option 301 N7977A/N6977A Option 301 Test Record Report Number ______ Date__________ Test Description Model Min. Specs Results Max. Specs Voltage Programming & Readback Minimum voltage (Vout): Both + 146 mV _______ + 174 mV Voltage measured over interface: Both Vout –...
Page 341: Service And Maintenance
Keysight N6900/N7900 Series Operating and Service Guide Service and Maintenance Introduction Self-Test Procedure Firmware Update Option Installation Instrument Sanitize Calibration Switches Battery Replacement Redundant Ground for 400 Hz Disassembly...
Page 342: Introduction
8 Service and Maintenance Introduction Types of Service Available If your instrument fails during the warranty period, Keysight Technologies will repair or replace it under the terms of your warranty. After your warranty expires, Keysight offers repair services at competitive prices.
Page 343: Cleaning
8 Service and Maintenance If the original shipping container is unavailable, use a container that will ensure at least 10 cm (4 in.) of compressible packaging material around the entire instrument. Use static-free packaging materials. Keysight suggests that you always insure shipments. Cleaning SHOCK HAZARD To prevent electric shock, unplug the unit before cleaning.
Page 344: Self-Test Procedure
8 Service and Maintenance Self-Test Procedure Power-On Self-Test Each time the instrument is powered on, a self-test is performed. This test assures you that the instrument is operational. Self-test checks that the minimum set of logic and power mesh systems are functioning properly. Self- test does not enable the output or place any voltages on the output.
Page 345: Firmware Update
8 Service and Maintenance Firmware Update Firmware Versions Version A.02.01.1256 The "A" version firmware can only be installed on instruments with serial numbers prior to MY59100101. Updates to the "A" firmware include: Added minimum and maximum power measurements. Added voltage compensation pole frequency setting. Version B.02.01.1256 and later The "B"...
Page 346: Update Procedure
8 Service and Maintenance Update Procedure Once you have copied both items to your computer, proceed as follows: 1. Run the Universal Firmware Update Utility 2. Browse to the location of the firmware that you just downloaded. Press Next. 3. Select the interface that you are using to communicate with your instrument and enter the address or connections string.
Page 347: Option Installation
8 Service and Maintenance Option Installation Be sure you have the latest firmware installed before you install any options . Refer Firmware Update for more information. The Option dialog lets you install a license key to activate options on your Advanced Power System. The available options are: 14585A - Control and Analysis Software.
Page 348: Instrument Sanitize
8 Service and Maintenance Instrument Sanitize This procedure is not recommended for use in routine applications because of the possibility of unintended loss of data. This procedure sanitizes all user data except for the black box recorder data. It writes all zeros to flash memory and then performs a full chip erase as per the manufacturer’s data sheet.
Page 349: Calibration Switches
8 Service and Maintenance Calibration Switches SHOCK HAZARD Only qualified, service-trained personnel who are aware of the hazards involved should remove instrument covers. Always disconnect the power cable and any external circuits before removing the instrument cover. Some circuits are active and have power for a short time even when the power switch is turned off. Two switches control the access to calibration commands.
Page 350: Battery Replacement
8 Service and Maintenance Battery Replacement SHOCK HAZARD Only qualified, service-trained personnel who are aware of the hazards involved should remove instrument covers. Always disconnect the power cable and any external circuits before removing the instrument cover. Some circuits are active and have power for a short time even when the power switch is turned off. The internal battery powers the real-time clock.
Page 351 8 Service and Maintenance 4. Use a flat-bladed screwdriver and carefully pry up on the side of the battery that is opposite the rib- bon cable connector 5. Install the new battery. Make sure that the positive side (+) is facing up. Place the battery under the small spring clips closest to the ribbon cable connector, then push down on the opposite end of the battery to seat the battery (see red arrow below).
Page 352: Redundant Ground For 400 Hz Operation
8 Service and Maintenance Redundant Ground for 400 Hz Operation SHOCK HAZARD Only qualified, service-trained personnel who are aware of the hazards involved should remove instrument covers. Always disconnect the power cable and any external circuits before removing the instrument cover. Some circuits are active and have power for a short time even when the power switch is turned off.
Page 353: Disassembly
8 Service and Maintenance Disassembly SHOCK HAZARD Only qualified, service-trained personnel who are aware of the hazards involved should remove instrument covers. Always disconnect the power cable and any external circuits before removing the instrument cover. Some circuits are active and have power for a short time even when the power switch is turned off. Electrostatic Discharge (ESD) Precautions Almost all electrical components can be damaged by electrostatic discharge (ESD) during handling.
Page 354 8 Service and Maintenance Cover screws Keysight N6900/N7900 Series Operating and Service Guide...
Page 355: Index
Index Average parallel 76 measurements 132 power dissipator 83 series 79 *CLS 233 signle unit 68 Battery replacement 350 *ESE 233 Contacting Black Box Recorder 162 *ESR? 234 Keysight 15 *IDN? 234 Current 94 CALibrate Subsystem 214 *LRN? 234 Current sharing 167 Calibration 307, 316 *OPC 235 calculations 182...
Page 356 Environment 67 menus 22 Error Messages 296 Message Available 237 I/O 296 ESE 233 Models 37 queue 296 ESR? 234 IDN? 234 Example Programs 202 IEEE-488 Common Com- Non-Volatile Settings 294 Expression mands 233 constraints 147 Impedance graphs 56 OPC 235 defining 143 INITiate Subsystem 239 OPC? 235...
Page 357 Power Assistant 186 Signal Routing 142 POWer Query 254 Software Rack mounting 89 Priority Mode black box recording 198 RCL 236 current 181 power assistant 186 rear panel 20-21 voltage 180 signal routing 189 Redundant ground 352 Programming SOURce Subsyatem 263 REFerence 26 ARB 125 Specificatons...
Page 358 Temperature meas- urements 134 Test record forms 322 TRG 237 Trigger Diagram 291 TRIGger Subsystem 276 Trigger Tutorial 290 TST? 237 user-protection 112 Using Device Clear 207 Verification 307, 311 test equipment 308 Voltage 93 VOLTage Subsyetem 280 WAI 238 Wait-for-trigger 237 Watt-hour measurements 134...

This manual is also suitable for:

N6970a N6971a N6952a N6972a N6953a N6973a ... Show all

Keysight Technologies N6900 Series Operating And Service Manual

Legal and Safety Information

1 Quick Reference

2 Installing the Instrument

3 Getting Started

4 Using the Advanced Power System

5 Using the Power Assistant Software

6 SCPI Programming Reference

7 Verification and Calibration

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Summary of Contents for Keysight Technologies N6900 Series