Keysight N8738A User Guide

User’s Guide

Keysight Series N8700 System DC Power Supply

Legal Notices

No part of this document may be photocopied, reproduced, or translated to another language without the prior agreement and written consent of Keysight Technologies as governed by United States and international copyright laws.

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.

Manual Editions

Manual Part Number: N8700-90001 Edition 7, December 2021

Reprints of this manual containing minor corrections and updates may have the same printing date. Revised editions are identified by a new printing date.

Declaration of Conformity

Declarations of Conformity for this product and for other Keysight products may be downloaded from the Web. Go to

http://www.keysight.com/go/conformi ty and click on “Declarations of

Conformity.” You can then search by product number to find the latest Declaration of Conformity.

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 our local Keysight office, or see

http://about.keysight.com/en/compan yinfo/environment/takeback.shtml for

more information.

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.

Exclusive Remedies

THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER'S SOLE AND EXCLUSIVE REMEDIES. KEYSIGHT TECHNOLOGIES SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

Assistance

This product comes with the standard product warranty. Warranty options, extended support contacts, product maintenance agreements and customer assistance agreements are also available. Contact your nearest Keysight Technologies Sales and Service office for further information on Keysight Technologies' full line of Support Programs.

Technologies Licenses

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.

Restricted Rights Legend

Software and technical data rights granted to the federal government include only those rights customarily provided to end user customers. Keysight provides this customary commercial license in Software and technical data pursuant to FAR 12.211 (Technical Data) and 12.212 (Computer Software) and, for the Department of Defense, DFARS

252.227-7015 (Technical Data – Commercial Items) and DFARS

227.7202-3 (Rights in Commercial Computer Software or Computer Software Documentation).

Trademarks

Microsoft and Windows are U.S. registered trademarks of Microsoft Corporation.

Series N8700 User’s Guide 3

Safety Notices

Both direct and alternating current

current

Neutral conductor on permanently installed equipment

is off

push switch

shock

documents

CAUTION

WARNING

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 for the customer's failure to comply with these 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 a Safety Class I instrument (provided with a protective earth terminal). To minimize shock hazard, the instrument chassis and cover must be connected to an electrical ground. 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.

Fuses

The instrument contains an internal fuse, which is not customer accessible.

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.

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 until the indicated conditions are fully understood and met.

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

CAUTION notice

indicated conditions are fully understood and met.

Safety Symbols

Direct current

Alternating current

Three phase alternating

Earth (ground) terminal

Protective earth ground terminal.

Frame or chassis terminal

Terminal is at earth potential.

Line conductor on permanently installed equipment.

On supply

Off supply

Standby supply. Unit is not completely disconnected from ac mains when switch

In position of a bi-stable

Out position of a bi-stable push switch

Caution, risk of electric

Caution, hot surface

Caution, refer to accompanying

Do not dispose in domestic household waste.

4 Series N8700 User’s Guide

In this Book

NOTE

Technologies at one of the following telephone

This User’s Manual contains the operating instructions, installation instructions, and specifications of the Keysight Technologies Series N8700 3.3kW and 5kW System DC Power Supplies. Specific chapters in this manual contain the following information:

 Quick Reference – Chapter 1 is a quick reference section that helps

you quickly become familiar with your Keysight N8700 power supply.

 Installation – Chapter 2 describes how to install your power supply.

It describes how to connect various loads to the output. It discusses remote sensing as well as parallel and series operation.

 Operating the Power Supply Locally – Chapter 3 describes how to

operate the power supply from the front panel and from the analog connector on the rear panel. It also includes a turn-on check-out procedure to verify the unit is operating properly.

 Operating the Power Supply Remotely – Chapter 4 describes how to

configure the remote interfaces. It also gives a brief overview of the SCPI command structure and basic programming concepts.

 Language Reference – Chapter 5 describes all of the SCPI

programming commands.

 Programming Examples – Chapter 6 provides Visual BASIC example

programs that illustrate some common applications.

 Specifications – Appendix A describes specifications and

supplemental characteristics.

 Verification and Calibration Procedures – Appendix B explains the

verification and calibration procedures.

 Service – Appendix C describes what to do if your unit requires

service.

 Compatibility – Appendix D documents the compatibility commands

of the Keysight 603xA power supplies that are supported by the Keysight N8700 power supplies.

You can contact Keysight numbers for warranty, service, or technical support information. In the United States: (800) 829-4444 In Europe: 31 20 547 2111 In Japan: 0120-421-345 Or use our Web link for information on contacting Keysight in your country or specific location: Or contact your Keysight Technologies Representative.

The web contains the most up to date version of the manual. Go to

http://www.keysight.com/find/N8700 to get the latest version of the

manual.

www.keysight.com/find/assist

Series N8700 User’s Guide 5

Contents

1 Quick Reference ............................................................................................................ 9

2 Installation ................................................................................................................... 17

The Keysight N8700 DC Power Supplies – At a Glance ............... 10

The Front Panel - At a Glance ....................................................... 12

The Rear Panel – At a Glance ........................................................ 14

General Information ....................................................................... 18

Inspecting the Unit ......................................................................... 18

Installing the Unit ........................................................................... 19

Connecting the Line Cord .............................................................. 21

Connecting the Load ...................................................................... 25

Output Voltage Sensing ................................................................. 29

Load Considerations ....................................................................... 30

Parallel Connections ...................................................................... 33

Series Connections ......................................................................... 35

J1 Connector Connections ............................................................ 37

3 Operating the Power Supply Locally ........................................................................... 39

Turn-On Check-Out ....................................................................... 40

Normal Operation ........................................................................... 42

Protection Functions ...................................................................... 43

Output On/Off Controls .................................................................. 46

Analog Programming of Output Voltage and Current .................. 49

4 Operating the Power Supply Remotely ....................................................................... 53

Connecting to the Interfaces ......................................................... 54

SCPI Commands – an Introduction ............................................... 63

5 Language Reference ................................................................................................... 69

SCPI Command Summary ............................................................. 70

Calibration Commands................................................................... 72

Measure Commands ...................................................................... 73

Output Commands ......................................................................... 74

Source Commands ......................................................................... 75

Status Commands .......................................................................... 77

System Commands ........................................................................ 83

Trigger Commands ......................................................................... 85

6 Series N8700 User’s Guide

6 Programming Examples .............................................................................................. 87

Output Programming Example ...................................................... 88

Trigger Programming Example ...................................................... 90

A Specifications .............................................................................................................. 93

Performance Specifications ........................................................... 94

Supplemental Characteristics ........................................................ 95

Outline Diagram ............................................................................. 98

B Verification and Calibration ........................................................................................ 99

Verification ...................................................................................... 99

Calibration .................................................................................... 128

C Service ...................................................................................................................... 131

Types of Service Available ............................................................ 132

Repackaging for Shipment .......................................................... 132

Operating Checklist ...................................................................... 132

Error Messages ............................................................................. 134

Recycling Plastic Components .................................................... 138

D Compatibility ............................................................................................................. 139

Differences – In General ............................................................... 140

Compatibility Command Summary .............................................. 141

Index ................................................................................................................................ 143

Series N8700 User’s Guide 7

1 Quick Reference

The Keysight N8700 DC Power Supplies – At a Glance ............... 10

The Front Panel - At a Glance ....................................................... 12

The Rear Panel – At a Glance ........................................................ 14

This chapter concisely describes the Keysight Technologies Series N8700 Power Supplies.

This chapter is not meant to describe every operating feature in detail. It is simply a quick reference guide to quickly become familiar with the essential components of the power supply. It can also be used as a memory jogger for experienced users to quickly find a front/rear panel function.

A quick reference programming command chart is included in the beginning of chapter 5.

1 Quick Reference

The Keysight N8700 DC Power Supplies – At a Glance

The Keysight Technologies Series N8700 System DC Power Supplies are general-purpose, 2U (two rack units) high, switching power supplies that are available with a wide variety of output voltage and current ratings. There are both 3.3 kW and 5 kW models.

These power supplies are power-factor corrected and have flexible AC input voltage options. Output voltage and current are continuously displayed and LED indicators show the complete operating status of the power supply.

The front panel controls allow the user to set the output parameters, over-voltage, under-voltage, and over-current protection levels, and preview the settings.

The rear panel includes the necessary connectors to control and monitor the power supply operation by analog signals or by the built-in remote communication interfaces.

Output Features

System Features

 Constant voltage/constant current with automatic crossover.  High-resolution voltage and current front panel controls.  Accurate voltage and current readback.  Independent edge-triggered external shut-off, and level-

triggered external enable/disable.

 Parallel operation with active current sharing.  Remote sensing to compensate for voltage drop in load leads.  Analog output programming and monitoring.

 Built-in GBIB/LAN/USB interface.  A built-in Web server that lets you control the instrument

directly from an internet browser on your computer.

 Zero-gap stacking - no ventilation holes at the top and bottom

surface of the power supply.

 Active power factor correction.  Fan speed control for low noise and extended fan life.

10 Series N8700 User’s Guide

Programmable Functions

3.3 kW Models

Note 1, 2

5 kW Models

Note 1, 2

Model

Voltage Range

Current Range

Model

Voltage Range

Current Range

 Output voltage and current setting.  Output voltage and current measurement.  Output voltage and current trigger setting.  Output On/Off control.  Over-current protection setting.  Over-voltage protection setting and readback.  Under-voltage limit setting and readback.  Start-up mode (either last setting or reset mode)  Status register setting and readback.  Bus trigger  Calibration

Model Ratings

Quick Reference 1

N8731A 0 – 8V 0 – 400A N8754A 0 – 20V 0 – 250A N8732A 0 – 10V 0 – 330A N8755A 0 – 30V 0 – 170A N8733A 0 – 15V 0 – 220A N8756A 0 – 40V 0 – 125A N8734A 0 – 20V 0 – 165A N8757A 0 – 60V 0 – 85A N8735A 0 – 30V 0 – 110A N8758A 0 – 80V 0 – 65A N8736A 0 – 40V 0 – 85A N8759A 0 – 100V 0 – 50A N8737A N8738A N8739A N8740A N8741A N8742A

0 – 60V 0 – 80V

0 – 55A

0 – 42A 0 – 100V 0 – 33A 0 – 150V 0 – 22A 0 – 300V 0 – 11A 0 – 600V 0 – 5.5A

N8760A N8761A N8762A

0 – 150V 0 – 34A 0 – 300V 0 – 17A 0 – 600V 0 – 8.5A

Note 1: Minimum output voltage is ≤ 0.2% of the rated output voltage. Note 2: Minimum output current is ≤ 0.4% of the rated output current.

Series N8700 User’s Guide 11

1 Quick Reference

1 – VOLTAGE knob

2 – VOLTAGE indicator

3 – DC VOLTS display

4 – DC AMPS display

5 – CURRENT indicator

6 – CURRENT knob

7 – OUT ON indicator

8 – OUT ON button

and AU7. Releasing

CV CC

VOLTAGE DC VOLTS DC AMPS CURRENT

PROT FINE LIMIT

UVL OCP

488

LAN OUT ON

OVP

3 4

7891011

1213

141516171819

The Front Panel - At a Glance

12 Series N8700 User’s Guide

Voltage function: Adjusts the output voltage, the over-voltage protection level, and the under-voltage limit. If over-voltage protection or under-voltage limits have been set, you cannot program the output voltage outside those limits. Press the FINE button to set fine adjustment resolution.

GPIB address: Selects the GPIB address when OCP/488 is pressed and held. Units purchased with Option NGP do not have a GPIB interface.

Indicates the unit is in constant voltage mode – with output voltage held constant.

Normally displays the voltage measured at the sense terminals.

Indicates the programmed voltage setting when the LIMIT button is pressed. Indicates either the OVP or UVL setting when the OVP/UVL button is pressed. Indicates the GPIB address when the OCP/488 button is pressed and held. Indicates the IP and Ethernet address when e LAN button is pressed and held.

Normally displays the current measured at the output terminals.

Indicates the programmed current setting when the LIMIT button is pressed. Indicates the IP and Ethernet address when the LAN button is pressed and held.

Indicates the unit is in constant current mode – with output current held constant.

Adjusts the output current. Press the FINE button to set fine adjustment resolution.

Indicates the output is enabled or on.

Output function: Press the OUT ON button to turn the output on or off. Press the OUT ON button to reset the unit and return the output to on after an OVP or OCP event.

Start-Up function: Press and hold the OUT ON button to toggle between the SafeStart and Auto-Restart modes. The display cycles between SAF the OUT ON button while one of the modes is displayed selects that mode.

Quick Reference 1

9 – LAN indicator

10 – LAN button

, followed by the six segments

11 – OCP indicator

12 – OCP/488 button

13 – OVP/UVL button

voltage protection level

14 – LIMIT button

front panel

15 – LIMIT indicator

16 – FINE button

17 – FINE indicator

18 – PROT indicator

19 – POWER switch

Indicates the LAN has been configured and is operating normally. Set another unit on the N8700 unit’s Web home page and the LAN indicator blinks to identify that unit.

View address: Press the LAN button to view the IP and Ethernet address. The display

first scrolls through the four segments of the IP address of the Ethernet (EA) address. Press any key to turn the address display off.

Reset address: Press and hold the LAN button for three seconds. Pressing the LAN button again while the message “LAn rES” is displayed resets the LAN configuration to the factory-shipped settings (see chapter 4 for settings). The display returns to normal and the configuration is not changed if the LAN button is not pressed again.

Indicates over-current protection is enabled or on.

Enable OCP: Press the OCP/488 button to turn over-current protection on. Press the

OCP/488 button again to turn over-current protection off.

Reset OCP: Press the OUT ON button to enable the output and re-arm over-current protection following an over-current protection event.

GPIB address: Press and hold the OCP/488 button for three seconds to set the GPIB address with the Voltage knob. Units purchased with Option NGP do not have a GPIB interface.

OVP function: Press the OVP/UVL button once to set the overwith the Voltage knob (the display shows OUP). You cannot set the over-voltage protection lower than about 5% above the present output voltage setting.

UVL function: Press the OVP/UVL button twice to set the under-voltage programming limit with the Voltage knob (the display shows UUL). You cannot set the undervoltage protection higher than about 5% below the present output voltage setting.

Limit function: Press the LIMIT button to display the output voltage and current limit. Settings are shown on the display for five seconds then the display returns to show the actual output voltage and current.

Lock function: Press and hold the LIMIT button to toggle between ‘Locked’ (LFP) and ‘Unlocked’ front panel (UFP). The display will cycle between LFP and UFP. Releasing the LIMIT button while one of the modes is displayed selects that mode. the display indicates rLFP, the front panel has been locked by a remote programming command.

Indicates the LIMIT button is pressed.

Sets Fine or Coarse adjustment control for the Voltage and Current knobs. Press the FINE button to set Fine mode; press again to return to Coarse mode.

Fine mode: Knobs operate with high resolution. Coarse mode: Knobs operate with lower resolution (approximately six turns).

Indicates the unit is in the high resolution ‘Fine’ adjustment mode.

Series N8700 User’s Guide 13

Blinks when a fault has occurred. OVP, OCP, OTP, Enable fail, and AC fail detection will cause the PROT (protection) indicator to blink. few seconds after the unit is turned off because of residual

The PROT indicator may blink and the display will indicate AC for a

energy inside the unit.

Turns the power supply on or off.

1 Quick Reference

1 – AC input connector 2 – DC output connector

3 – Analog programming connector

4 – SW1 setup switch 5 – Remote Sense connector

6 – GPIB connector

7 – LAN connector

8 – USB connector

9 – Ground screw & nut

WARNING

SHOCK HAZARD The AC power cable provides a chassis ground through the ground conductor. Be certain that your power source is threeconductor for single-phase models or four-conductor for 3-phase models with the ground conductor (green/yellow) connected to earth ground.

6 7 8

5 4

8V – 100V

(bus bar)

150V – 600V

(wire clamp)

3-phase VAC

(four-conductor)

2-phase VAC

(three-conductor)

The Rear Panel – At a Glance

Header with mating plug-in connector for both the 3.3 kW and 5 kW output models. A 3-conductor plug is provided for single-phase VAC. A 4-conductor plug is provided for 3-phase VAC.

Wire clamp connector is used for 150V, 300V and 600V models. Bus bars are used for 8V to 100V models.

Connector for the analog interface. Includes output voltage and current limit programming and monitoring signals, Shut-Off control (electrical signal), Enable/Disable control (dry-contact), power supply ok (Power Supply OK) signal and operation mode (CV/CC) signal. (See next page for details)

Nine-position switch for selecting remote programming and monitoring modes

for Output Voltage, Current Limit and other control functions. (See next page for details)

Connector for making remote sensing connections for regulating the load voltage and compensating for wiring voltage drop. (See next page for details)

Connector for connecting to a GPIB interface. See chapter 4 for setup. Units purchased with Option NGP do not have a GPIB interface.

Connector for connecting to a LAN interface. LINK LED indicates link integrity.

TX LED indicates LAN activity. See chapter 4 for LAN setup.

Connector for connecting to a USB interface. See chapter 4 for setup.

M4x8 screws with nut for making chassis ground connections

14 Series N8700 User’s Guide

J2 Sense Connector

1 – Remote sense (+) 2 – Local sense (+) 3 – Not used 4 – Local sense (–) 5 – Remote sense (–)

1 – Output voltage, voltage programming

2 – Output current, voltage programming

3 – Programming range (voltage/resistance)

4 – Voltage and Current monitoring range

5 – Shut-Off Logic Select

6 – Not Used

7 – Output voltage, resistive programming

8 – Output current, resistive programming

9 – Enable/Disable control

Quick Reference 1

The factory-shipped configuration is shown in the figure.

SW1 Setup Switch

The factory-shipped setting is Down for all switches.

Down: The output voltage is programmed by the front panel. Up: The output voltage is programmed by the external voltage signal.

Down: The output current is programmed by the front panel. Up: The output current is programmed by the external voltage signal.

Down: The remote programming range is: 0 – 5V / 0 – 5KΩ. Up: The remote programming range is: 0 – 10V / 0 – 10KΩ.

Down: The remote monitoring range is: 0 – 5V. Up: The remote monitoring range is: 0 – 10V.

Series N8700 User’s Guide 15

Down: OUT OFF = Low (0 – 0.6V) or short; OUT ON = High (2V – 15V) or open. Up: OUT OFF = High (2V – 15V) or open; OUT ON = Low (0 – 0.6V) or short.

Down: The output voltage is programmed by the front panel. Up: The output voltage is programmed by the external resistor.

Down: The output current is programmed by the front panel. Up: The output current is programmed by the external resistor.

Down: The J1 Enable+/Enable– pins are not active. Up: The J1 Enable+/Enable– pins are active.

1 Quick Reference

Pin 1:

Enable IN

Pin 2, 3:

Chassis Common

Pin 4–7:

Not Used

Pin 8:

Local/Analog

Pin 9:

Voltage Program

Pin 10:

Current Program

Pin 11:

Voltage Monitor

Pin 12:

Common

Pin 13:

CV/CC

Pin 14:

Enable OUT

Pin 15:

Shut Off

Pin 16:

Power Supply OK

Pin 17–20:

Not Used

Pin 21:

Local/Analog State

Pin 22:

Voltage Prog. Return

Pin 23:

Current Prog. Return

Pin 24:

Current Monitor

Pin 25:

Parallel

141516

1718

2021

1011

Current Monitor

Current Prog.

Return

Voltage Prog.

Return

Local

/ Analog State

Chassis Common

Enable IN

Voltage Monitor

Common (-

)

Current Program Voltage Program Local / Analog

Parallel

Enable OUT Shut Off Power Supply OK

Chassis Common

J1 Analog Programming Connector

The factory-shipped default configuration is Local operation, which does not require connection to J1.

Connect Pin 1 to Pin 14 to enable the output. Disconnect to disable the output.

No connection

Signal return for Pin 15 and Pin 16. Connected to chassis.

Input for selecting between front panel or analog programming of output.

Input for voltage or resistance programming of the output voltage.

Input for voltage or resistance programming of the output current.

Output for monitoring the output voltage.

Signal return for Pin 8, Pin11, Pin 13, and Pin 24. Referenced to –S.

Output for constant voltage/constant current mode indication.

Connect Pin 14 to Pin 1 to enable output. Disconnect to disable output.

Input for Shut-Off control of the output. Referenced to Chassis Common.

No connection

Output to indicate power supply status. Referenced to Chassis Common.

Output for indication of local or analog programming mode.

Signal return for Pin 9. Connected internally to pin 12.

Signal return for Pin 10. Referenced to pin 12.

Output for monitoring the output current.

Output for current balancing in parallel operation. Connected internally to pin 24.

16 Series N8700 User’s Guide

2 Installation