Keysight N6900 Series Service manual

Keysight
Advanced Power System
N6900/N7900 Series
Operating and
Service Guide

Welcome
Welcome
This document includes user, service, and programming information for the Keysight Advanced Power System (APS)
Family. If you have feedback on this document, please contact Keysight at www.keysight.com/find/APS-docfeedback.
Preliminary Information
Legal and Safety Information
Model Features and Options
Specifications and Characteristics
Operating Information
Introduction to the Instrument
Installing the Instrument
Getting Started
Using the Advanced Power System
Using the Power Assistant Software
Front Panel Menu Reference
SCPI Programming Information
Introduction to the SCPI Language
Commands by Subsystem
Command Quick Reference
SCPI Error Messages
Service Information
Performance Verification
Calibration Procedure
Keysight N6900/N7900 Series Operating and Service Guide 1

Welcome
Contact Keysight Technologies
You can contact Keysight Technologies for warranty, service, or technical support.
lIn the United States: 800 829 4844
lIn Europe: 31 20 547 9999
lIn Japan: 81 426 56 7832
Use www.keysight.com/find/assist for information on contacting Keysight worldwide, or contact your Keysight
Technologies Representative.
© Copyright Keysight Technologies 2013, 2014
Edition 5, August 2014
Updated November 2014
Manual part number N7900-90901
2 Keysight N6900/N7900 Series Operating and Service Guide

Legal and Safety Information
Legal and Safety Information
Legal Notices
Safety Notices
Safety Symbols
Legal Notices
© Copyright Keysight Technologies 2013, 2014
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
550 Clark Drive, Suite 101
Budd Lake, NJ 07828 USA
Software and Documentation Revisions
For the latest firmware revision go to the product page at www.keysight.com/find/APS.
You can download the latest version of this document at www.keysight.com/find/APS-doc . The latest version is also
available for mobile devices at www.keysight.com/find/APS-mobilehelp.
This product uses Microsoft Windows CE. Keysight highly recommends that all Windows-based computers connected to
Windows CE instruments use current anti-virus software.
The hardware and/or software described in this document are furnished under a license and may be used or copied only
in accordance with the terms of such license.
License Files
/*
* Sonic 0.2
* --
* https://github.com/padolsey/Sonic
* --
* This program is free software. It comes without any warranty, to
* the extent permitted by applicable law. You can redistribute it
* and/or modify it under the terms of the Do What The ---- You Want
* To Public License, Version 2, as published by Sam Hocevar. See
*http://sam.zoy.org/wtfpl/COPYING for more details. */
Keysight N6900/N7900 Series Operating and Service Guide 3

Legal and Safety Information
Warranty
The material contained in this document is provided "as is," and is subject to being changed, without notice, in future
editions. Further, to the maximum extent permitted by applicable law, Keysight disclaims all warranties, either express
or implied, with regard to this manual and any information contained herein, including but not limited to the implied
warranties of merchantability and fitness for a particular purpose. Keysight shall not be liable for errors or for incidental
or consequential damages in connection with the furnishing, use, or performance of this document or of any
information contained herein. Should Keysight and the user have a separate written agreement with warranty terms
covering the material in this document that conflict with these terms, the warranty terms in the separate agreement
shall control.
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 by the Institute's calibration facility, and to the calibration
facilities of other International Standards Organization members
Restricted Rights Legend
If software is for use in the performance of a U.S. Government prime contract or subcontract, Software is delivered and
licensed as "Commercial computer software" as defined in DFAR 252.227-7014 (June 1995), or as a "commercial
item" as defined in FAR 2.101(a) or as "Restricted computer software" as defined in FAR 52.227-19 (June 1987) or any
equivalent agency regulation or contract clause. Use, duplication or disclosure of Software is subject to Keysight
Technologies’ standard commercial license terms, and non-DOD Departments and Agencies of the U.S. Government
will receive no greater than Restricted Rights as defined in FAR 52.227-19(c)(1-2) (June 1987). U.S. Government
users will receive no greater than Limited Rights as defined in FAR 52.227-14 (June 1987) or DFAR 252.227-7015 (b)
(2) (November 1995), as applicable in any technical data.
Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC
This product complies with the WEEE Directive 2002/96/EC) marketing requirement. The affixed product label (see
below) indicates that you must not discard this electrical/electronic product in domestic household waste.
Product Category: With reference to the equipment types in the WEEE directive Annex 1, this product is classified as
“Monitoring and Control instrumentation” product.
To return unwanted products, contact our local Keysight office, or see www.keysight.com/environment/product for
more information.
Technical Support
If you have questions about your shipment, or if you need information about warranty, service, or technical support,
contact Keysight Technologies.
4 Keysight N6900/N7900 Series Operating and Service Guide

Legal and Safety Information
Safety Notices
The following general safety precautions must be observed during all phases of operation of this instrument. 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.
General
Do not use this product in any manner not specified by the manufacturer. The protective features of this product may
be impaired if it is used in a manner not specified in the operation instructions.
Before Applying Power
Verify that all safety precautions are taken. Make all connections to the unit before applying power. Note the
instrument's external markings described under "Safety Symbols".
Ground the Instrument
This product is provided with protective earth terminals. To minimize shock hazard, the instrument must be connected
to the AC power mains through a grounded power cable, with the ground wire firmly connected to an electrical ground
(safety ground) at the power outlet. Any interruption of the protective (grounding) conductor or disconnection of the
protective earth terminal will cause a potential shock hazard that could result in personal injury.
Do Not Operate in an Explosive Atmosphere.
Do not operate the instrument in the presence of flammable gases or fumes.
Do Not Remove the Instrument Cover
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.
Fuses
The instrument contains an internal fuse, which is not user accessible.
Do Not Modify the Instrument
Do not install substitute parts or perform any unauthorized modification to the product. Return the product to a
Keysight Sales and Service Office for service and repair to ensure that safety features are maintained.
In Case of Damage
Instruments that appear damaged or defective should be made inoperative and secured against unintended operation
until they can be repaired by qualified service personnel.
A CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not
correctly performed or adhered to, could result in damage to the product or loss of important data. Do not proceed
beyond a CAUTION notice until the indicated conditions are fully understood and met.
Keysight N6900/N7900 Series Operating and Service Guide 5

Legal and Safety Information
A WARNING notice denotes a hazard. It calls attention to an operating procedure, practice, 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.
Safety Symbols
Direct current
Alternating current
Frame or chassis terminal
Standby supply. Unit is not completely disconnected from AC mains when switch is
off.
Caution, risk of electric shock
Caution, refer to accompanying documents
Earth ground terminal
The CE mark is a registered trademark of the European Community.
The ETL mark is a registered trademark of Intertek.
The C-tick mark is a registered trademark of the Spectrum Management Agency of
Australia. This signifies compliance with the Australian EMC Framework regulations
under the terms of the Radio Communications Act of 1992.
South Korean Class A EMC Declaration
This equipment is Class A suitable for professional use and is for use in
electromagnetic environments outside of the home.
Contains one or more of the 6 hazardous substances above the maximum
concentration value (MCV), 40 Year EPUP.
1SM1-A This text indicates that the instrument is an Industrial Scientific and Medical Group 1
Class A product (CISPER 11, Clause 4).
ICES/NMB-
001
This text indicates product compliance with the Canadian Interference- Causing
Equipment Standard (ICES-001).
6 Keysight N6900/N7900 Series Operating and Service Guide

Model Features and Options
Model Features and Options
Model Features
Keysight N6900 models Keysight N7900 dynamic models
Feature 1 kW 2 kW 1 kW 2 kW
Voltage/Current
Ratings
N6950A 9 V/100 A
N6951A 20 V/50 A
N6952A 40 V/25 A
N6953A 60V/16.7A
N6954A 80V/12.5A
N6970A 9 V/200 A
N6971A 20V/100 A
N6972A 40 V/50 A
N6973A 60 V/33.4A
N6974A 80 V/25 A
N6976A 120V/16.7A
N6977A 160V/12.5A
N7950A 9 V/100 A
N7951A 20 V/50 A
N7952A 40 V/25 A
N7953A 60V/16.7A
N7954A 80V/12.5A
N7970A 9 V/200 A
N7971A 20V/100 A
N7972A 40 V/50 A
N7973A 60 V/33.4A
N7974A 80 V/25 A
N7976A 120V/16.7A
N7977A 160V/12.5A
Voltage and current
programming
14-bit precision 14-bit precision 16-bit precision 16-bit precision
Voltage and current
measurements
18-bit precision 18-bit precision 18-bit precision 18-bit precision
Programmable output
resistance
• • • •
Current sinking up to
10% of rated current1• • • •
Power
measurements
• • • •
Amp-Hour and Watt-
Hour Measurements
• • • •
Low current
measurement range
• •
Seamless current
measurements
• •
Adjustable sample rate • •
Array readback • •
External data logging • •
Parallel operation • • • •
Signal routing • • • •
Output lists • •
Keysight N6900/N7900 Series Operating and Service Guide 7

Model Features and Options
Keysight N6900 models Keysight N7900 dynamic models
Feature 1 kW 2 kW 1 kW 2 kW
Arbitrary waveforms • •
Disconnect relays with
polarity reverse2N7950A3 N7951A-N7954A
N7970A3
N7971A-N7974A
N7976A, N7977A4
1Current sinking up to 100% of rated current requires one power dissipator for 1 kW models, and two power dissipators
for 2 kW models. 2 kW models with one power dissipator can sink 50% of their rated current.
2An AC network is always present across the output terminals.
3Polarity reverse relays are not included on models N7950A and N7970A.
4Models N7976A and N7977A include solid state disconnect relays in addition to galvanic disconnect relays for faster
protection disconnect.
Accessories/Options
Accessory/
Option Number
Description
Keysight N7909A 1 kW power dissipator. 1 unit is required for 1 kW power supplies to sink the rated output
power; 2 units are required for 2 kW power supplies to sink the rated output power.
Keysight N7908A
Option 057
Black Box Recorder board. Installs in a slot on the bottom of unit. When installed, appears
as Option 057 in the "About" screen and must be check-marked on the unit label.
Keysight N7907A Rack Ear and Slide Accessory Kit - everything needed for mounting 1 kW models, 2 kW
models, and the power dissipator in 19-inch EIA cabinets.
N6700-60012 1U Rack ears only - for 1 kW models and the power dissipator (1.75 in. high)
5063-9212 2U Rack ears only - for 2 kW models (3.5 in. high)
5063-9219 2U Rack ears with handles - for 2 kW models (3.5 in. high)
5003-1128 Rack slides only - for mounting 1 kW models, 2 kW models, and the power dissipator in 19-
inch EIA cabinets.
Keysight E664AC Rails only - for mounting 2 kW models in 19 inch EIA cabinets. Because of required airflow,
you cannot use rails for rack mounting 1 kW models or the power dissipator.
Option UK6 Commercial calibration with test results data.
Option 760 Disconnect relays with polarity reverse. When installed, appears as option 760 in the
"About" screen and on the unit label. This option is included on most N7900 models.
Option 761 Disconnect relays - no polarity reverse. When installed, appears as option 761 in the
"About" screen and on the unit label. This option is included on N7950A and N7970A
models.
Keysight 14585A Control and Analysis Software
8 Keysight N6900/N7900 Series Operating and Service Guide

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
Output Impedance Graphs
Inductive Load Boundary
Output Quadrants
Voltage Programming Response
Output Dynamic Response
Measurement Accuracy and Resolution
Dimension Diagrams
Introduction
Unless otherwise noted, specifications are warranted over the ambient temperature range of 0 to 40°C after a 30-
minute warm-up period. Specifications apply at the output terminals, with the sense terminals connected to the
output terminals (local sensing). Accuracy specifications are warranted for one year.
Supplemental characteristics are not warranted but are descriptions of performance determined either by design or by
type testing. All supplemental characteristics are typical unless otherwise noted.
Specifications - Keysight N6900 Series
1 kW Specifications N6950A N6951A N6952A N6953A N6954A
DC Ratings
Voltage source:
Current source:
Current sink 10% rating:
Current sink 100% rating:1
Power:2
0 to 9 V
0 to 100 A
-10 A
-100 A
900 W
0 to 20 V
0 to 50 A
-5 A
-50 A
1 kW
0 to 40 V
0 to 25 A
-2.5 A
-25 A
1 kW
0 to 60 V
0 to 16.7 A
-1.67 A
-16.7 A
1 kW
0 to 80 V
0 to 12.5 A
-1.25 A
-12.5 A
1 kW
Output ripple & noise3
CV rms:
CV peak-to-peak:
1 mV
9 mV
Keysight N6900/N7900 Series Operating and Service Guide 9

Specifications and Characteristics
1 kW Specifications N6950A N6951A N6952A N6953A N6954A
Load regulation
Voltage:
Current:
0.5 mV
8 mA
0.75 mV
3 mA
1.5 mV
1 mA
2 mV
1 mA
2 mV
0.8 mA
Voltage programming &
measurement accuracy4, 5, 6
Lead drop ≤1 V max:
Lead drop ≤25% of V rating:
0.03% +1.5 mV
0.03% +1.9 mV
0.03% +3 mV
0.03% +4 mV
0.03% +6 mV
0.03% +7.9 mV
0.03% +9 mV
0.03% +12 mV
0.03% +12 mV
0.03% +16 mV
Current programming &
measurement accuracy40.1% +30 mA 0.1% +15 mA 0.1% +8 mA 0.1% +5 mA 0.1% +4 mA
Transient response7
Recovery Time:
Settling band:
100 µs
150 mV
100 µs
150 mV
100 µs
100 mV
100 µs
150 mV
100 µs
200 mV
2 kW Specifications N6970A N6971A N6972A N6973A N6974A
DC Ratings
Voltage source:
Current source:
Current sink 10% rating:
Current sink 100% rating:1
Power:2
0 to 9 V
0 to 200 A
-20 A
-200 A
1.8 kW
0 to 20 V
0 to 100 A
-10 A
-100 A
2 kW
0 to 40 V
0 to 50 A
-5 A
-50 A
2 kW
0 to 60 V
0 to 33.3 A
-3.33 A
-33.3 A
2 kW
0 to 80 V
0 to 25A
-2.5 A
-25 A
2 kW
Output ripple & noise3
CV rms:
CV peak-to-peak:
1 mV
9 mV
Load regulation
Voltage:
Current:
0.5 mV
15 mA
0.75 mV
6 mA
1.5 mV
1.5 mA
2 mV
1.5 mA
2 mV
1.5 mA
Voltage programming &
measurement accuracy4, 5, 6
Lead drop ≤1 V max:
Lead drop ≤25% of V rating:
0.03% +1.5 mV
0.03% +1.9 mV
0.03% +3 mV
0.03% +4 mV
0.03% +6 mV
0.03% +7.9 mV
0.03% +9 mV
0.03% +12 mV
0.03% +12 mV
0.03% +16 mV
Current programming &
measurement accuracy40.1%+60 mA 0.1%+30 mA 0.1%+15 mA 0.1%+10 mA 0.1%+8 mA
Transient response7
Recovery Time:
Settling band:
100 µs
150 mV
100 µs
150 mV
100 µs
100 mV
100 µs
150 mV
100 µs
200 mV
1Current sinking up to 100% of rated current requires one power dissipator for 1 kW models, and two power dissipators for 2 kW
models. 2 kW models with one power dissipator can sink 50% of their rated current.
2Maximum continuous power available is derated at 1% of rating per degree C from 40°C to 55°C
3From 20 Hz to 300 kHz for rms noise; from 20 Hz to 20 MHz for peak-to-peak noise
4At 23°C ±5°C after a 30 minute warm-up; measurement NPLC=1; valid for 1 year, see Calibration Interval
5With resistance programming enabled, the voltage programming offset component increases by a factor of 2.1
6Load lead drop applies to each load lead
7Time to recover to within the settling band following a load change from 50% to 100% of full load (10 µs rise time)
10 Keysight N6900/N7900 Series Operating and Service Guide

Specifications and Characteristics
Specifications - Keysight N7900 Series
1 kW Specifications N7950A N7951A N7952A N7953A N7954A
DC Ratings
Voltage source:
Current source:
Current sink 10% rating:
Current sink 100% rating:1
Power:2
0 to 9 V
0 to 100 A
-10 A
-100 A
900 W
0 to 20 V
0 to 50 A
-5 A
-50 A
1 kW
0 to 40 V
0 to 25 A
-2.5 A
-25 A
1 kW
0 to 60 V
0 to 16.7 A
-1.67 A
-16.7 A
1 kW
0 to 80 V
0 to 12.5 A
-1.25 A
-12.5 A
1 kW
Output ripple & noise3
CV rms:
CV peak-to-peak:
1 mV
9 mV
Load regulation
Voltage:
Current:
0.5 mV
8 mA
0.75 mV
3 mA
1.5 mV
1 mA
2 mV
1 mA
2 mV
0.8 mA
Voltage programming &
measurement accuracy4, 5, 6
Lead drop ≤1 V max:
Lead drop ≤25% of V rating:
0.03% +1 mV
0.03% +1.4 mV
0.03% +2 mV
0.03% +3 mV
0.03% +4 mV
0.03% +5.9mV
0.03% +6 mV
0.03% +9 mV
0.03% +8 mV
0.03% +12mV
Current programming &
measurement accuracy40.04% +15 mA 0.04% +8 mA 0.04% +4 mA 0.04%+2.5 mA 0.04% +2 mA
Current measurement low
range accuracy
0.05% +3 mA 0.05% +1 mA 0.05% +0.6 mA 0.05% +0.3 mA 0.05% +0.25 mA
Transient response7
Recovery Time:
Settling band:
100 µs
150 mV
100 µs
150 mV
100 µs
100 mV
100 µs
150 mV
100 µs
200 mV
2 kW Specifications N7970A N7971A N7972A N7973A N7974A
DC Ratings
Voltage source:
Current source:
Current sink 10% rating:
Current sink 100% rating:1
Power:2
0 to 9 V
0 to 200 A
-20 A
-200 A
1.8 kW
0 to 20 V
0 to 100 A
-10 A
-100 A
2 kW
0 to 40 V
0 to 50 A
-5 A
-50 A
2 kW
0 to 60 V
0 to 33.3 A
-3.33 A
-33.3 A
2 kW
0 to 80 V
0 to 25A
-2.5 A
-25 A
2 kW
Output ripple & noise3
CV rms:
CV peak-to-peak:
1 mV
9 mV
Load regulation
Voltage:
Current:
0.5 mV
15 mA
0.75 mV
6 mA
1.5 mV
1.5 mA
2 mV
1.5 mA
2 mV
1.5 mA
Voltage programming &
measurement accuracy4, 5, 6
Lead drop ≤1 V max:
Lead drop ≤25% of V rating:
0.03% +1 mV
0.03% +1.4 mV
0.03% +2 mV
0.03% +3 mV
0.03% +4 mV
0.03% +5.9mV
0.03% +6 mV
0.03% +9 mV
0.03% +8 mV
0.03% +12mV
Current programming &
measurement accuracy40.04% +30 mA 0.04% +15 mA 0.04% +8 mA 0.04% +5 mA 0.04% +4 mA
Keysight N6900/N7900 Series Operating and Service Guide 11

Specifications and Characteristics
2 kW Specifications N7970A N7971A N7972A N7973A N7974A
Current measurement low
range accuracy
0.05% +6 mA 0.05% +2 mA 0.05% +1.2 mA 0.05% +0.6 mA 0.05% +0.5 mA
Transient response7
Recovery Time:
Settling band:
100 µs
150 mV
100 µs
150 mV
100 µs
100 mV
100 µs
150 mV
100 µs
200 mV
1Current sinking up to 100% of rated current requires one power dissipator for 1 kW models, and two power dissipators for 2 kW
models. 2 kW models with one power dissipator can sink 50% of their rated current.
2Maximum continuous power available is derated at 1% of rating per degree C from 40°C to 55°C
3From 20 Hz to 300 kHz for rms noise; from 20 Hz to 20 MHz for peak-to-peak noise
4At 23°C ±5°C after a 30 minute warm-up; measurement NPLC=1; valid for 1 year, see Calibration Interval
5With resistance programming enabled, the voltage programming offset component increases by a factor of 3.15
6Load lead drop applies to each load lead
7Time to recover to within the settling band following a load change from 50% to 100% of full load (10 µs rise time)
Specifications - Keysight N6900/N7900 High Voltage Series
2 kW Specifications N6976A N6977A N7976A N7977A
DC Ratings
Voltage source:
Current source:
Current sink 10% rating:
Current sink 100% rating:1
Power:2
0 to 120 V
0 to 16.7 A
-1.67 A
-16.7 A
2 kW
0 to 160 V
0 to 12.5 A
-1.25 A
-12.5 A
2 kW
0 to 120 V
0 to 16.7 A
-1.67 A
-16.7 A
2 kW
0 to 160 V
0 to 12.5 A
-1.25 A
-12.5 A
2 kW
Output ripple & noise3
CV rms:
CV peak-to-peak:
2 mV
30 mV
3 mV
30 mV
2 mV
30 mV
3 mV
30 mV
Load regulation
Voltage:
Current:
4 mV
1 mA
4 mV
0.8 mA
4 mV
1 mA
4 mV
0.8 mA
Voltage programming &
measurement accuracy4, 5, 6
Lead drop ≤1 V max:
Lead drop ≤25% of V rating:
0.03% +17 mV
0.03% +23 mV
0.03% +24 mV
0.03% +32 mV
0.03% +11 mV
0.03% +17 mV
0.03% +14 mV
0.03% +22 mV
Current programming &
measurement accuracy40.1%+5 mA 0.1%+4 mA 0.04%+2.5 mA 0.04% +2 mA
Current measurement low range
accuracy
N/A N/A 0.05%+0.4 mA 0.05%+0.25 mA
Transient response7
Recovery Time:
Settling band:
100 µs
300 mV
100 µs
400 mV
100 µs
300 mV
100 µs
400 mV
1Two power dissipators required to sink up to 100% of rated current; one power dissipator sinks up to 50% of rated current.
2Maximum continuous power available is derated at 1% of rating per degree C from 40°C to 55°C
3From 20 Hz to 300 kHz for rms noise; from 20 Hz to 20 MHz for peak-to-peak noise
4At 23°C ±5°C after a 30 minute warm-up; measurement NPLC=1; valid for 1 year, see Calibration Interval
5With resistance programming enabled, the voltage programming offset component increases by a factor of 2.1
6Load lead drop applies to each load lead
7Time to recover to within the settling band following a load change from 50% to 100% of full load (10 µs rise time)
12 Keysight N6900/N7900 Series Operating and Service Guide

Specifications and Characteristics
Supplemental Characteristics - Keysight N6900 Series
1 kW Characteristics N6950A N6951A N6952A N6953A N6954A
Minimum compliance
limits
Voltage priority:
Current priority:
100 mA
9 mV
50 mA
20 mV
25 mA
40 mV
16 mA
60 mV
13 mA
80 mV
Voltage programming
Range:
Resolution:
0.009 to 9.18 V
0.84 mV
0.02 to 20.4 V
1.7 mV
0.04 to 40.8 V
3.5 mV
0.06 to 61.2 V
5 mV
0.08 to 81.6 V
6.7 mV
Current programming
Range-no dissipator:
Range-with dissipator:
Resolution:
–10.2 to 102 A
–102 to 102 A
30 mA
–5.1 to 51 A
–51 to 51 A
15 mA
–2.55 to 25.5 A
–25.5 to 25.5 A
8 mA
–1.7 to 17 A
–17 to 17 A
5 mA
–1.275 to 12.75A
–12.75 to 12.75A
4 mA
Current measurement
range
-225 to 225 A -112.5 to 112.5A -56.2 to 56.2 A -37.6 to 37.6 A -28.1 to 28.1 A
Resistance programming
Range:
Accuracy:1
Resolution:
0 to 0.1 Ω
0.12% +1.6 mΩ*A
0.8 µΩ
0 to 0.4 Ω
0.12% +3.2 mΩ*A
3.4 µΩ
0 to 1.6 Ω
0.1% +6.4 mΩ*A
13 µΩ
0 to 3.4 Ω
0.1% +8.8 mΩ*A
30 µΩ
0 to 6.4 Ω
0.1% +12.8 mΩ*A
54 µΩ
Voltage programming &
measurement TempCo20.0022%+30µV 0.0022%+60µV 0.0022%+120µV 0.0022%+180µV 0.0022%+220µV
Current programming &
measurement TempCo2
0.0057%+250µA 0.0058%+125µA 0.0058%+60µA 0.0058%+40µA 0.0058%+30µA
Resistance programming
TempCo
0.0068% 0.0070% 0.0070% 0.0070% 0.0070%
Over-Voltage Protection
Maximum setting:
Accuracy:
Response time:3
10.8 V
0.03% +1.5 mV
<30 µs
24 V
0.03% +3 mV
<30 µs
48 V
0.03% +6 mV
<30 µs
72 V
0.03% +9 mV
<30 µs
96 V
0.03% +12 mV
<30 µs
Voltage measurement
noise (peak)
2 mV 3.5 mV 7 mV 10 mV 14 mV
Current measurement
noise (peak)
45 mA 22 mA 10 mA 6 mA 4 mA
Output current noise
CC rms:
15 mA 15 mA 15 mA 15 mA 15 mA
Common mode current
CC rms:
CC peak-to-peak:
2 mA
10 mA
1 mA
10 mA
1 mA
10 mA
1 mA
10 mA
1.5 mA
10 mA
Voltage up-
programming time4
10% to 90%:
Settling time:63 ms 10 ms
Keysight N6900/N7900 Series Operating and Service Guide 13

Specifications and Characteristics
1 kW Characteristics N6950A N6951A N6952A N6953A N6954A
Voltage down-
programming time5
90% to 10%:
Settling time:63 ms 10 ms
Current up- and down-
programming time7
10% to 90%:
90% to 10%:
2.5 ms
2.5 ms
Output-on delay time
Voltage priority:
Current priority:
12 ms
14 ms
Line regulation8
Voltage:
Current:
< 10 µV
< 10 µA
2 kW Characteristics N6970A N6971A N6972A N6973A N6974A
Minimum compliance
limits
Voltage priority:
Current priority:
200 mA
9 mV
100 mA
20 mV
50 mA
40 mV
33 mA
60 mV
26 mA
80 mV
Voltage programming
Range:
Resolution:
0.009 to 9.18 V
0.84 mV
0.02 to 20.4 V
1.7 mV
0.04 to 40.8 V
3.5 mV
0.06 to 61.2 V
5 mV
0.08 to 81.6 V
6.7 mV
Current programming
Range-no dissipator:
Range-with dissipator:
Resolution:
-20.4 to 204 A
–204 to 204 A
60 mA
–10.2 to 102 A
–102 to 102 A
30 mA
–5.1 to 51 A
–51 to 51 A
15 mA
–3.4 to 34 A
–34 to 34 A
10 mA
–2.55 to 25.5 A
–25.5 to 25.5 A
8 mA
Current measurement
range
-450 to 450 A -225 to 225 A -112.5 to 112.5A -74.9 to 74.9 A -56.2 to 56.2 A
Resistance programming
Range:
Accuracy:1
Resolution:
0 to 0.05 Ω
0.12% +1.6 mΩ*A
0.4 µΩ
0 to 0.2 Ω
0.12% +3.2 mΩ*A
1.7 µΩ
0 to 0.8 Ω
0.1% +6.4 mΩ*A
7 µΩ
0 to 1.7 Ω
0.1% +8.8 mΩ*A
15 µΩ
0 to 3.2 Ω
0.1% +12.8 mΩ*A
27 µΩ
Voltage programming &
measurement TempCo2
0.0022%+30µV 0.0022%+60µV 0.0022%+120µV 0.0022%+180µV 0.0022%+220µV
Current programming &
measurement TempCo2
0.0048%+500µA 0.0049%+250µA 0.0049%+120µA 0.0049%+80µA 0.0049%+60µA
Resistance programming
TempCo
0.0060% 0.0060% 0.0060% 0.0060% 0.0060%
Over-Voltage Protection
Maximum setting:
Accuracy:
Response time:3
10.8 V
0.03% +1.5 mV
<30 µs
24 V
0.03% +3 mV
<30 µs
48 V
0.03% +6 mV
<30 µs
72 V
0.03% +9 mV
<30 µs
96 V
0.03% +12 mV
<30 µs
14 Keysight N6900/N7900 Series Operating and Service Guide

Specifications and Characteristics
2 kW Characteristics N6970A N6971A N6972A N6973A N6974A
Voltage measurement
noise (peak)
2 mV 3.5 mV 7 mV 10 mV 14 mV
Current measurement
noise (peak)
75 mA 45 mA 18 mA 12 mA 7 mA
Output current noise
CC rms:
20 mA 20 mA 15 mA 15 mA 15 mA
Common mode current
CC rms:
CC peak-to-peak:
2 mA
15 mA
1 mA
10 mA
1 mA
10 mA
1 mA
10 mA
2 mA
10 mA
Voltage up-
programming time4
10% to 90%:
Settling time:63 ms 10 ms
Voltage down-
programming time5
90% to 10%:
Settling time:63 ms 10 ms
Current up- and down-
programming time7
10% to 90%:
90% to 10%:
2.5 ms
2.5 ms
Output-on delay time
Voltage priority:
Current priority:
12 ms
14 ms
Line regulation8
Voltage:
Current:
< 10 µV
< 10 µA
1Resistance 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.
2Per degree C
3From occurrence of over-voltage to start of shutdown
4With full resistive load and a voltage transition from 0.1% to 100% of rated output
5With no load and a voltage transition from 100% to 0.1% of rated output
6From start of voltage change to within 0.1% of final full scale value
7With full resistive load and a current transition from 0.1% to 100% or 100% to 0.1% of rated output
8Line regulation is guaranteed by design
Keysight N6900/N7900 Series Operating and Service Guide 15

Supplemental Characteristics - Keysight N7900 Series
1 kW Characteristics N7950A N7951A N7952A N7953A N7954A
Minimum compliance
limits
Voltage priority:
Current priority:
100 mA
9 mV
50 mA
20 mV
25 mA
40 mV
16 mA
60 mV
13 mA
80 mV
Voltage programming
Range:
Resolution:
0.009 to 9.18 V
0.21 mV
0.02 to 20.4 V
0.42 mV
0.04 to 40.8 V
0.84 mV
0.06 to 61.2 V
1.25 mV
0.08 to 81.6 V
1.68 mV
Current programming
Range-no dissipator:
Range-with dissipator:
Resolution:
–10.2 to 102 A
–102 to 102 A
1.9 mA
–5.1 to 51 A
–51 to 51 A
0.95 mA
–2.55 to 25.5 A
–25.5 to 25.5 A
0.47 mA
–1.7 to 17 A
–17 to 17 A
0.32 mA
–1.275 to 12.75A
–12.75 to 12.75A
0.24 mA
Current measurement
range
High range
Low range
-225 to 225 A
-11 to 11 A
-112.5 to 112.5A
-5.5 to 5.5 A
-56.2 to 56.2 A
-2.75 to 2.75 A
-37.6 to 37.6 A
-1.84 to 1.84 A
-28.1 to 28.1 A
-1.37 to 1.37 A
Resistance programming
Range:
Accuracy:1
Resolution:
0 to 0.1 Ω
0.06% +1.6 mΩ*A
0.8 µΩ
0 to 0.4 Ω
0.06% +3.2 mΩ*A
3.4 µΩ
0 to 1.6 Ω
0.06% +6.4 mΩ*A
13 µΩ
0 to 3.4 Ω
0.06% +8.8 mΩ*A
30 µΩ
0 to 6.4 Ω
0.06% +12.8 mΩ*A
54 µΩ
Voltage programming &
measurement TempCo20.0022%+30µV 0.0022%+60µV 0.0022%+120µV 0.0022%+180µV 0.0022%+220µV
Current programming &
measurement TempCo20.0035%+250µA 0.0035%+125µA 0.0042%+60µA 0.0037%+40µA 0.0036%+30µA
Current measurement low
range TempCo20.0042%+80µA 0.0045%+40µA 0.0050%+20µA 0.0046%+12µA 0.0045%+9µA
Resistance programming
TempCo
0.0046% 0.0049% 0.0054% 0.0050% 0.0049%
Over-Voltage Protection
Maximum setting:
Accuracy:
Response time:3
10.8 V
0.03% +1 mV
<30 µs
24 V
0.03% +2 mV
<30 µs
48 V
0.03% +4 mV
<30 µs
72 V
0.03% +6 mV
<30 µs
96 V
0.03% +8 mV
<30 µs
Voltage measurement
noise (peak)
2 mV 3.5 mV 7 mV 10 mV 14 mV
Current measurement
noise (peak)
45 mA 22 mA 10 mA 6 mA 4 mA
Current measurement low
range noise (peak)
30 mA 17 mA 7 mA 4 mA 2 mA
Output current noise
CC rms:
15 mA 15 mA 15 mA 15 mA 15 mA
16 Keysight N6900/N7900 Series Operating and Service Guide

1 kW Characteristics N7950A N7951A N7952A N7953A N7954A
Common mode current
CC rms:
CC peak-to-peak:
2 mA
10 mA
1 mA
10 mA
1 mA
10 mA
1 mA
10 mA
1.5 mA
10 mA
Voltage up-
programming time4
10% to 90%:
Settling time:60.5 ms 1 ms
Voltage down-
programming time5
90% to 10%:
Settling time:60.35 ms 0.8 ms
Current up- and down-
programming time7
10% to 90%:
90% to 10%:
2.5 ms
2.5 ms
Output-on delay time
Voltage priority:
with relay on:
Current priority:
with relay on:
12 ms
38 ms
14 ms
46 ms
Line regulation8
Voltage:
Current:
< 10 µV
< 10 µA
Small signal bandwidth
Voltage programming:9
Current programming:10
Voltage measurement:
Current measurement:
DC to 1 kHz (-1dB);DC to 2 kHz (-3dB)
DC to 70 Hz (-1dB);DC to 120 Hz (-3dB)
DC to 14 kHz (-1dB);DC to 25 kHz (-3dB)
DC to 14 kHz (-1dB);DC to 25 kHz (-3dB)
2 kW Characteristics N7970A N7971A N7972A N7973A N7974A
Minimum compliance
limits
Voltage priority:
Current priority:
200 mA
9 mV
100 mA
20 mV
50 mA
40 mV
33 mA
60 mV
26 mA
80 mV
Voltage programming
Range:
Resolution:
0.009 to 9.18 V
0.21 mV
0.02 to 20.4 V
0.42 mV
0.04 to 40.8 V
0.84 mV
0.06 to 61.2 V
1.25 mV
0.08 to 81.6 V
1.68 mV
Current programming
Range-no dissipator:
Range-with dissipator:
Resolution:
-20.4 to 204 A
–204 to 204 A
3.8 mA
–10.2 to 102 A
–102 to 102 A
1.9 mA
–5.1 to 51 A
–51 to 51 A
0.95 mA
–3.4 to 34 A
–34 to 34 A
0.64 mA
–2.55 to 25.5 A
–25.5 to 25.5 A
0.48 mA
Current measurement
range
High range
Low range
-450 to 450 A
-22 to 22 A
-225 to 225 A
-11 to 11 A
-112.5 to 112.5A
-5.5 to 5.5 A
-74.9 to 74.9 A
-3.67 to 3.67 A
-56.2 to 56.2 A
-2.75 to 2.75 A
Keysight N6900/N7900 Series Operating and Service Guide 17

2 kW Characteristics N7970A N7971A N7972A N7973A N7974A
Resistance programming
Range:
Accuracy:1
Resolution:
0 to 0.05 Ω
0.06% +1.6 mΩ*A
0.4 µΩ
0 to 0.2 Ω
0.06% +3.2 mΩ*A
1.7 µΩ
0 to 0.8 Ω
0.06% +6.4 mΩ*A
7 µΩ
0 to 1.7 Ω
0.06% +8.8 mΩ*A
15 µΩ
0 to 3.2 Ω
0.06% +12.8 mΩ*A
27 µΩ
Voltage programming &
measurement TempCo20.0022%+30µV 0.0022%+60µV 0.0022%+120µV 0.0022%+180µV 0.0022%+220µV
Current programming &
measurement TempCo20.0029%+500µA 0.0031%+250µA 0.0035%+120µA 0.0032%+80µA 0.0032%+60µA
Current measurement low
range TempCo20.0040%+160µA 0.0041%+80µA 0.0045%+40µA 0.0042%+24µA 0.0041%+18µA
Resistance programming
TempCo
0.0043% 0.0045% 0.0049% 0.0046% 0.0045%
Over-Voltage Protection
Maximum setting:
Accuracy:
Response time:3
10.8 V
0.03% +1 mV
<30 µs
24 V
0.03% +2 mV
<30 µs
48 V
0.03% +4 mV
<30 µs
72 V
0.03% +6 mV
<30 µs
96 V
0.03% +8 mV
<30 µs
Voltage measurement
noise (peak)
2 mV 3.5 mV 7 mV 10 mV 14 mV
Current measurement
noise (peak)
75 mA 45 mA 18 mA 12 mA 7 mA
Current measurement low
range noise (peak)
50 mA 30 mA 12 mA 6 mA 3 mA
Output current noise
CC rms:
20 mA 20 mA 15 mA 15 mA 15 mA
Common mode current
CC rms:
CC peak-to-peak:
2 mA
15 mA
1 mA
10 mA
1 mA
10 mA
1 mA
10 mA
2 mA
10 mA
Voltage up-
programming time4
10% to 90%:
Settling time:60.5 ms 1 ms
Voltage down-
programming time5
90% to 10%:
Settling time:60.35 ms 0.8 ms
Current up- and down-
programming time7
10% to 90%:
90% to 10%:
2.5 ms
2.5 ms
18 Keysight N6900/N7900 Series Operating and Service Guide

2 kW Characteristics N7970A N7971A N7972A N7973A N7974A
Output-on delay time
Voltage priority:
with relay on:
Current priority:
with relay on:
12 ms
38 ms
14 ms
46 ms
Line regulation8
Voltage:
Current:
< 10 µV
< 10 µA
Small signal bandwidth
Voltage programming:9
Current programming:10
Voltage measurement:
Current measurement:
DC to 1 kHz (-1dB);DC to 2 kHz (-3dB)
DC to 70 Hz (-1dB);DC to 120 Hz (-3dB)
DC to 14 kHz (-1dB);DC to 25 kHz (-3dB)
DC to 14 kHz (-1dB);DC to 25 kHz (-3dB)
1Resistance 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.
2Per degree C
3From occurrence of over-voltage to start of shutdown
4With full resistive load and a voltage transition from 0.1% to 100% of rated output
5With no load and a voltage transition from 100% to 0.1% of rated output
6From start of voltage change to within 0.1% of final full scale value
7With full resistive load and a current transition from 0.1% to 100% or 100% to 0.1% of rated output
8Line regulation is guaranteed by design
9With High Bandwidth setting, no load condition (see Voltage Programming Response)
10 With resistive load condition
Supplemental Characteristics - Keysight N6900/N7900 High Voltage Series
2 kW Characteristics N6976A N6977A N7976A N7977A
Minimum compliance
limits
Voltage priority:
Current priority:
16 mA
120 mV
13 mA
160 mV
16 mA
120 mV
13 mA
160 mV
Voltage programming
Range:
Resolution:
0.12 to 122.4 V
16.9 mV
0.16 to 163.2 V
22.5 mV
0.12 to 122.4 V
2.5 mV
0.16 to 163.2 V
3.6 mV
Current programming
Range-no dissipator:
Range-with dissipator:
Resolution:
–1.7 to 17 A
–17 to 17 A
5 mA
–1.275 to 12.75A
–12.75 to 12.75A
3.8 mA
–1.7 to 17 A
–17 to 17 A
0.32 mA
–1.275 to 12.75A
–12.75 to 12.75A
0.24 mA
Current measurement
range
High range
Low range
-37.6 to 37.6 A
N/A
-28.1 to 28.1 A
N/A
-37.6 to 37.6 A
-1.84 to 1.84 A
-28.1 to 28.1 A
-1.37 to 1.37 A
Resistance programming
Range:
Accuracy:1
Resolution:
0 to 6.8 Ω
0.1% +17.7 mΩ*A
60 µΩ
0 to 12.8 Ω
0.1% +25.6 mΩ*A
108 µΩ
0 to 6.8 Ω
0.06% +17.7 mΩ*A
60 µΩ
0 to 12.8 Ω
0.06% +25.6 mΩ*A
108 µΩ
Keysight N6900/N7900 Series Operating and Service Guide 19