Keysight Technologies RP7900 Series Service manual

Keysight Regenerative
Power System
RP7900 Series
Operating and
Service Guide

Legal and Safety Information 9
Legal Notices 9
Safety Symbols 11
Safety Notices 12
1 Quick Reference 15
Introduction to the Instrument 16
Regenerative Power System at a Glance 16
Front Panel at a Glance 17
Rear Panel at a Glance 18
Front Panel Display at a Glance 19
Front Panel Keys at a Glance 20
Front Panel Menu Reference 21
Command Quick Reference 24
Model Features and Options 33
Model Features 33
Options/Accessories 34
Specifications and Characteristics - RP793xA, RP794xA 35
Specifications - RP793xA, RP794xA 35
Supplemental Characteristics - RP793xA, RP794xA 36
Common Characteristics 37
Output Impedance Graphs 39
Inductive Load Boundary for Current Priority Mode 41
Capacitive Load Boundary for Voltage Priority Mode 43
Small Signal Programming Response (All Models) 49
Measurement Accuracy and Resolution - with shorter measurement intervals 49
Excessive Dynamic Protection 50
Output Quadrants 50
Dimensions - RP793xA and RP794xA 51
Specifications and Characteristics - RP795xA, RP796xA 52
Specifications - RP795xA, RP796xA 52
Supplemental Characteristics - RP795xA, RP796xA 53
Common Characteristics 54
Output Impedance Graphs 55
Inductive Load Boundary for Current Priority Mode 57
Capacitive Load Boundary for Voltage Priority Mode 58
Voltage Programming Response (All Models) 58
Excessive Dynamic Protection 59
Output Quadrants 59
Dimensions - RP795xA and RP796xA 60
2 Installing the Instrument 61
Before Installation or Use 62
Inspect the Unit 62
Check for Items Supplied 62
Review Safety Information 63
Observe Environmental Conditions 63
Provide Adequate Air Flow 63
3 Keysight RP7900 Series Operating and Service Guide

Stacking Instruments 63
Rack Mounting 64
Single Unit Connections 66
Power Cable Connections 66
Output Connections 68
Single Load Connections 70
Multiple Load Connections 71
Remote Sense Connections 72
Additional Load Considerations - all Models 74
Additional Load Considerations - RP793xA, RP794xA 75
Multiple Unit Connections 78
Parallel Connections 78
Load and Sense Connections 78
Master/Slave Connections - for all models 80
Current Sharing Connections - RP795xA, RP796xA 81
Series Connections 82
Interface Connections 83
GPIB Connections 83
USB Connections 83
LAN Connections - site and private 84
Digital Port Connections 85
Interface Cover Installation 86
3 Getting Started 87
Using the Front Panel 88
Turn the Unit On 88
Set the Output Voltage 89
Set the Output Current 90
Set Over-voltage Protection 91
Enable the Output 92
Use Built-in Help System 92
Remote Interface Configuration 93
Introduction 93
USB Configuration 93
GPIB Configuration 93
LAN Configuration 94
Modifying the LAN Settings 95
Using the Web Interface 98
Using Telnet 99
Using Sockets 99
Interface Lockout 99
4 Using the Regenerative Power System 101
Programming the Output 102
Set the Output Priority Mode 102
Set the Output Voltage 103
Set the Output Current 103
Set the Slew Rate 104
Set the Output Resistance 104
Keysight RP7900 Series Operating and Service Guide 4

Set the Output Bandwidth - RP795xA, RP796xA 105
Set the Output Bandwidth - RP793xA, RP794xA 106
Set the Output Turn-On/Turn-Off Mode - RP793xA, RP794xA 108
Enable the Output 108
Parallel Operation 110
Introduction 110
Master/Slave Operation 111
Independent Parallel Operation - RP795xA, RP796xA 115
Current Sinking Operation 118
Current Sinking 118
Regenerative Operation 118
Programming Output Protection 119
Introduction 119
Set the Over-Voltage Protection 120
Set the Over-Current Protection 120
Output Watchdog Timer 122
Set the Under-Voltage Protection 122
Clear Output Protection 123
Programming Output Transients 124
Output Transients 124
Common Actions for All Transients 124
Programming a Step Transient 127
Programming a List Transient 128
Programming an Arbitrary Waveform 132
Sequencing the Output 134
Turn-On/Turn-Off Delays 134
Coupling the Output 134
Sequencing Multiple Units 135
Output Turn-On Turn-Off Behavior 137
External Data Logging 141
External Data Logging 141
Select the Measurement Function and Range 142
Specify the Integration Period 142
Select the Elog Trigger Source 142
Initiate and Trigger the Elog 143
Periodically Retrieve the Data 143
Terminate the Elog 144
Making Measurements 145
Average Measurements 145
Measurement Sweep 145
Measurement Windowing 146
A-hour & W-hour measurement 146
Digitized Measurements 147
Measurement Triggering 149
Programming the Digital Port 155
Digital Control Port 155
Bi-Directional Digital I/O 156
Digital Input 157
5 Keysight RP7900 Series Operating and Service Guide

External Trigger I/O 157
Fault Output 158
Inhibit Input 158
Fault/Inhibit System Protection 159
Output Couple Control 160
System-Related Operations 161
Instrument Identification 161
Instrument State Storage 161
Front Panel Display 162
Front Panel Lock-Out 162
Password Protection 163
Clock Setup 163
Priority Mode Tutorial 164
Voltage Priority 164
Current Priority 165
5 SCPI Programming Reference 167
Related Information 168
SCPI Introduction 169
Introduction 169
Keywords 170
Queries 170
Command Separators and Terminators 170
Syntax Conventions 171
Parameter Types 172
Device Clear 173
Typical Command Processing Times 173
Commands by Subsystem 175
ABORt Subsystem 176
ARB Subsystem 177
CALibrate Subsystem 179
CURRent Subsystem 183
DIGital Subsystem 187
DISPlay Subsystem 189
FETCh Subsystem 190
FORMat Subsystem 193
FUNCtion Command 194
HCOPy Subsystem 195
IEEE-488 Common Commands 196
INITiate Subsystem 201
INSTrument Subsystem 202
LIST Subsystem 204
LXI Subsystem 207
MEASure Subsystem 208
OUTPut Subsystem 210
POWer Query 216
SENSe Subsystem 217
[SOURce] Subsystem 220
Keysight RP7900 Series Operating and Service Guide 6

STATus Subsystem 221
STEP Command 225
SYSTem Subsystem 226
TRIGger Subsystem 232
VOLTage Subsystem 235
Status Tutorial 240
Status Registers 240
Operation Status Group 240
Questionable Status Groups 241
Standard Event Status Group 242
Status Byte Register 243
Error and Output Queues 243
Status Diagram 244
Trigger Tutorial 245
Trigger Sources 245
Trigger Destinations 245
Trigger Diagram 246
Reset State (*RST) 247
SCPI Error Messages 252
Compatibility Commands 260
APS code-compatible commands with RPS models 260
APS feature set comparison with RPS models 260
6 Verification and Calibration 263
Test Equipment and Setups 264
Test Equipment 264
Measurement Setups 265
Performance Verification 266
Introduction 266
Verification Setups 268
Test Considerations 268
Verification Procedure 269
Instrument Calibration 273
Introduction 273
Calibration Interval 274
Calibration Setups 274
Test Considerations 275
Calibration Procedure 275
Test Record Forms 279
7 Service and Maintenance 287
Introduction 288
Repair Service Available 288
Before Returning the Unit 288
Repackaging for Shipment 288
Cleaning 289
Self-Test Procedure 290
Power-On Self-Test 290
User-Initiated Self-Test 290
7 Keysight RP7900 Series Operating and Service Guide

Firmware Update 291
Software Required 291
Update Procedure 291
Restricting Access 291
Instrument Sanitize 292
Calibration Switches 293
Accessing the Calibration Switch 293
Switch Functions 293
Battery Replacement 294
Disassembly 296
Electrostatic Discharge (ESD) Precautions 296
Tools Required 296
Cover Disassembly 296
Control Board Disassembly 297
Constellation Board Disassembly 298
Appendix A Keysight SD1000A Safety Disconnect System 299
Keysight SD1000A Safety Disconnect System 300
Introduction 300
Keysight SD1000A Safety Disconnect System at a Glance 300
Supplemental Characteristics 302
Installing the Keysight SD1000A Safety Disconnect System 304
Keysight SD1000A-to-RP7900 Connections 304
External Control Connections 306
Operating the Keysight SD1000A Safety Disconnect System 309
Controlling the SDS Using the RP7900 series Power Supply 309
Controlling the SDS Using Externally Wired Controls 311
Index 315
Keysight RP7900 Series Operating and Service Guide 8

Legal and Safety Information
Legal Notices
Safety Symbols
Safety Notices
Legal Notices
© Copyright Keysight Technologies 2017- 2019
Edition 5, August 2019
Updated December 2019
Manual part number RP7900-90901
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
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
From gifencode C source code:
* Code drawn from ppmtogif.c, from the pbmplus package Based on GIFENCOD
* by David Rowley <[e-mail]>. A Lempel-Zim
* compression based on "compress". Modified by Marcel Wijkstra
* <[e-mail]> Copyright (C) 1989 by Jef Poskanzer. Permission
* to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation. This software is provided "as is" without
* express or implied warranty. The Graphics Interchange Format(c) is the
* Copyright property of CompuServe Incorporated. GIF(sm) is a Service
* Mark property of CompuServe Incorporated. ;
Legal and Safety Information
9 Keysight RP7900 Series Operating and Service Guide

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
US Government Rights
The Software is “commercial computer software,” as defined by Federal Acquisition Regulation (“FAR”) 2.101. Pursuant to FAR 12.212 and
27.405-3 and Department of Defense FAR Supplement (“DFARS”) 227.7202, the U.S. government acquires commercial computer software
under the same terms by which the software is customarily provided to the public. Accordingly, Keysight provides the Software to U.S.
government customers under its standard commercial license, which is embodied in its End User License Agreement (EULA), acopy of which
can be found at www.keysight.com/find/sweula. The license set forth in the EULA represents the exclusive authority by which the U.S.
government may use, modify, distribute, or disclose the Software. The EULA and the license set forth therein, does not require or permit,
among other things, that Keysight: (1) Furnish technical information related to commercial computer software or commercial computer
software documentation that is not customarily provided to the public; or (2) Relinquish to, or otherwise provide, the government rights in
excess of these rights customarily provided to the public to use, modify, reproduce, release, perform, display, or disclose commercial
computer software or commercial computer software documentation. No additional government requirements beyond those set forth in the
EULA shall apply, except to the extent that those terms, rights, or licenses are explicitly required from all providers of commercial computer
software pursuant to the FAR and the DFARS and are set forth specifically in writing elsewhere in the EULA. Keysight shall be under no
obligation to update, revise or otherwise modify the Software. With respect to any technical data as defined by FAR 2.101, pursuant to FAR
12.211 and 27.404.2 and DFARS 227.7102, the U.S. government acquires no greater than Limited Rights as defined in FAR 27.401 or DFAR
227.7103-5 (c), 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.
Do not dispose in domestic household waste.
To return unwanted products, contact your local Keysight office.
Keysight RP7900 Series Operating and Service Guide 10
Legal and Safety Information

Safety Symbols
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.
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.
Direct current
Alternating current
Frame or chassis terminal
Standby supply. Unit is not completely disconnected from AC mains when switch is off.
risk of electric shock
refer to accompanying documents
Earth ground terminal
The CE mark is a registered trademark of the European Community.
ISM1-A This indicates that the instrument is an Industrial Scientific and Medical Group 1 Class A product (CISPER 11,
Clause 4)
ICES/NMB-001 This indicates product compliance with the Canadian Interference- Causing Equipment Standard.
The ETL mark is a registered trademark of Intertek. The text indicates product compliance with the Canadian
Interference- Causing Equipment Standard (ICES-001).
The RCM mark is a registered trademark of the Australian Communications and Media Authority.
Contains one or more of the 6 hazardous substances above the maximum concentration value (MCV), 40 Year
EPUP.
South Korean Class A EMC Declaration.
This equipment has been conformity assessed for use in business environments. In a residential environment this
equipment may cause radio interference. This EMC statement applies to the equipment only for use in business
environments.
Legal and Safety Information
11 Keysight RP7900 Series Operating and Service Guide

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.
The equipment is for industrial use. Equipment operators are subject to all applicable safety
regulations. Along with the warning and safety notices in this manual, all relevant safety, accident
prevention, and environmental regulations must also be followed. In particular, the operators of the
equipment:
lMust be informed of the relevant safety requirements.
lMust have read and understood the operating manual before using the equipment.
lMust use the designated and recommended safety equipment.
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 operating instructions.
Environmental Conditions
Never use the instrument outside of the specified environmental conditions described
in the Environmental Characteristics of the specifications.
Heavy Weight
Danger to hands and feet. To avoid personal injury and damage to the instrument,
always use a sturdy cart or other suitable device to move the instrument. Do not lift the
instrument alone; always use two people to lift the instrument.
SHOCK HAZARD Ground the Instrument
This product is provided with a protective earth terminal. To minimize shock hazard,
the instrument must be connected to the AC 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
injury or death.
Keysight RP7900 Series Operating and Service Guide 12
Legal and Safety Information

Before Applying Power
Verify that all safety precautions are taken. All connections must be made with the unit
turned off, and must be performed by qualified personnel who are aware of the
hazards involved. Improper actions can cause fatal injury as well as equipment
damage. Note the instrument's external markings described under "Safety Symbols".
SHOCKHAZARD, LETHAL VOLTAGES Many models generate voltages greater than 60
VDC, with some models rated at 950 VDC! Ensure that all instrument connections,
load wiring, and load connections are either insulated or covered using the safety
covers provided, so that no accidental contact with lethal voltages can occur.
SHOCK HAZARD Never touch cables or connections immediately after turning off the
unit. Depending on the model, lethal voltages can remain at the output terminals for
several seconds after turn-off. Verify that there is no dangerous voltage on the output
or sense terminals before touching them.
SHOCK HAZARD from external energy sources.
Because the instrument can be used as a load to sink current, hazardous voltages
from an external energy source such as a battery may be present on the output
terminals even with the unit turned off. Provision must be made to disconnect the
external energy source before touching the output or sense terminals.
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.
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.
Fuses
The instrument contains an internal fuse, which is not customer accessible.
Cleaning
To prevent electric shock, always disconnect the AC mains before cleaning. Use a dry
cloth or one slightly dampened with water to clean the external case parts. Do not use
detergent or chemical solvents. Do not attempt to clean internally.
Legal and Safety Information
13 Keysight RP7900 Series Operating and Service Guide

In Case of Damage
Instruments that are not functioning correctly, appear damaged or defective should be
made inoperative and secured against unintended operation until they can be repaired
by qualified service personnel.
Keysight RP7900 Series Operating and Service Guide 14
Legal and Safety Information

Keysight RP7900 Series Operating and Service Guide
1
Quick Reference
Legal and Safety Information
Introduction to the Instrument
Front Panel Menu Reference
Command Quick Reference
Model Features and Options
Specifications and Characteristics - RP793xA, RP794xA
Specifications and Characteristics - RP795xA, RP796xA
This document includes user, service, and programming information for the
Keysight Regenerative Power System (RPS) Family.
Documentation, Firmware, and Technical Support
You can download the latest version of this document at www.keysight.com.
Type in your model number in the Search field. Manuals are available under the
Document Library tab. The latest version is also available for mobile devices at
www.keysight.com/find/RPS-mobilehelp.
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
Use www.keysight.com/find/assist for information on contacting Keysight
worldwide, or contact your Keysight Technologies representative.
© Copyright Keysight Technologies 2017- 2019

Introduction to the Instrument
Regenerative Power System at a Glance
Front Panel at a Glance
Rear Panel at a Glance
Front Panel Display at a Glance
Front Panel Keys at a Glance
Safety Disconnect System at a Glance
Regenerative Power System at a Glance
The Keysight Regenerative Power System (RPS) Family includes 3U rack-mountable DC power
supplies with performance and features that are optimized for automated test systems. The output
and system features are described as follows. The Models and Options section describes the features
that apply to specific models.
Output features
lFull programming capability for the entire range of output voltage and current
lOutput autoranging for greater flexibility
lOutput can operate in voltage priority or current priority mode
lHigh-speed up and down output programming
lOutput resistance programming
lTurn-on/turn-off delays allow output on/off sequencing across multiple units
lCurrent sharing capability for paralleled outputs
lProtection capability includes over-voltage, over-current, and over-temperature
lTwo-quadrant operation provides current sourcing and sinking capability
l100% rated current-sink capability
l5 kW and 10 kW rated models
Measurement features
l5.12 microsecond sample rate
lReal-time power measurements
lA-hour & W-hour measurement
lDigitized measurement capability
1 Quick Reference
16 Keysight RP7900 Series Operating and Service Guide

System features
lSave and recall up to 10 instrument states in non-volatile memory
lGPIB (IEEE-488), LAN, and USB remote programming interfaces are built in
lFront panel menu setup for GPIB and LANparameters
lLXI Core 2011 compliant, including a built-in Web server
lSCPI (Standard Commands for Programmable Instruments) compatibility
lMaster-Slave function allows for composite output control and display from one unit
Regenerative Operation
Regenerative operation is automatic and requires no programming on the part of the user. Whenever
the RPS is sinking current, either by rapidly downprogramming the output, or by discharging an energy
source such as a battery, the unit will direct the excess power back to the AC mains. You cannot
disable the regenerative operation.
During regenerative operation, the power factor of 0.99 is maintained. Sinewave current distortion is
less than 2% at full load. This ensures the quality of the AC signal that is returned to the AC mains.
When an AC mains dropout is sensed, galvanic relays disconnect the AC mains and the unit shuts
down. To safeguard your device under test, the RPS provides “anti-islanding” that senses that the grid
is live before regenerating power back to the grid.
Refer to Common Characteristics for additional information about unit shutdown and restart.
Front Panel at a Glance
1. On/Off switch and LED - LED indicates power is on. Green indicates normal operation. Amber indic-
ates display is in screen-saver mode.
2. Display - Turns off after 1 hour of inactivity. Press any key to restore the display.
3. System keys - Select metering function. Access front panel command, help, and error menus.
4. Navigation keys - Move the cursor to a menu item. Select the highlighted menu item.
Keysight RP7900 Series Operating and Service Guide 17
1 Quick Reference

5. Output keys - Turn the outputs on or off. Enter voltage or current.
6. Numeric Entry keys - Enter values. Arrow keys increment or decrement numeric settings.
Rear Panel at a Glance
1. AC input - 3-phase AC input (L1, L2, L3) with chassis ground. The AC input is bi-directional.
2. DC outputs - Positive and negative output terminals.
3. Sensing - Remote sense terminals - connected for local sensing.
4. GPIB - GPIB interface connector.
5. Digital IO - Digital IO connector. Pins are user-configurable.
6. USB - USB interface connector.
7. LAN - 10/100/1000 Base-T Left LED indicates activity. Right LED indicates link integrity.
8. Master/slave - Master/slave connectors - for grouping paralleled units.
9. Termination switches - Specifies master/slave termination types.
1 Quick Reference
18 Keysight RP7900 Series Operating and Service Guide

10. SDS connector - Keysight SD1000A system connector - for models only.
11. Sharing - Current sharing connector - for models only.
Front Panel Display at a Glance
Voltage and current
measurements
Displays the actual output voltage and current
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– = the output is disabled by the negative power limit
VL+ = the output is in positive voltage limit mode
CL+/– = the output is in positive or negative current limit mode
OV = the output is disabled by the over-voltage protection
OV– = the output is disabled by the negative over-voltage protection
OC = the output is disabled by the over-current protection
OT = the over-temperature protection has tripped
PF = the output is disabled by a power-fail condition
P = the instrument has been paralleled with another instrument
Inh = the output is disabled by an external inhibit signal
Unr = the output is unregulated
Prot = the output is disabled by a protection condition on another unit
EDP = the output is disabled by excessive output dynamics protection
IPK+/– = the output is in positive or negative peak current limit
CSF = a current sharing fault has occurred
MSP = A master/slave protection has occurred
SDP = A safety disconnect system fault has occurred
UV = the output is disabled by the under-voltage protection
T-on = the output is turning on
T-off = the output is turning off
Voltage and current
settings
Displays the programmed voltage and current. These settings may not match the measured
output voltage or current. For example, in constant voltage operation, the output current setting
(limit) may be set to 1 A, but the actual (measured) output current must be less than 1 A for the
output to remain in constant voltage mode. If the Current limit is reached, the output will no
longer be operating in constant voltage mode, but will be in current limit mode. In this case, the
actual output voltage will now be less than the output voltage setting.
Keysight RP7900 Series Operating and Service Guide 19
1 Quick Reference

Status area Indicates the following remote interface activity:
Err = an error has occurred (press Error key to display error message)
Lan = the LAN is connected and has been configured
IO = there is activity on one of the remote interfaces
Front Panel Keys at a Glance
The On/Off switch turns the unit on or off. The LED indicates power is on.
Green indicates normal operation. Yellow indicates that the display is in
screen saver mode. The LED is also yellow during the boot-up process .
Press any key to exit screen saver mode.
The System keys access the following front panel meter and command
menus:
Meter returns the display to metering mode. Also toggles between current
and power measurements.
Menu accesses the command menu.
Function key is reserved for future use.
Back backs out of a menu without activating any changes.
Help accesses information about the displayed menu control.
Error displays any error messages in the error queue.
The Navigation keys do the following:
The Arrow keys move around in the command menus. They also select
alpha characters in alpha-numeric entry fields.
The Select key lets you make a selection in the command menus. It also lets
you enter edit mode for editing the numeric parameters.
The Output keys do the following:
On/Off controls the output.
Voltage lets you change the voltage setting.
Current lets you change the current setting.
The Numeric entry keys do the following:
The 0 through 9 keys enter numbers.
The (.) key is the decimal point.
The – key is used to enter a minus sign.
The up/down arrow keys increment or decrement voltage or current
settings. They also select letters in alphabetic entry fields.
The E key enters an exponent. Add the value to the right of the E.
The Backspace key deletes digits as it backspaces over them.
The Enter key enters a value. If you exit a field without pressing the Enter
key, the value is ignored.
Press the Help key to get context sensitive help.
1 Quick Reference
20 Keysight RP7900 Series Operating and Service Guide