Keysight E3633A, E3634A User Manual

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Keysight E3633A and E3634A DC Power Supplies

User’s Guide

Notices

CAUTION

WARNING

duced 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.

Manual Part Number

E3634-90001

Edition

Edition 9, March 26, 2019

Printed in:

Printed in Malaysia

Published by:

Keysight Technologies Bayan Lepas Free Industrial Zone, 11900 Penang, Malaysia

Technology 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.

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/conformity. You can then search by

product number to find the latest Declaration of Conformity.

U.S. 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), a copy of which can be found at http://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, mod ify, reprod uce, 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.

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.

Safety Information

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.

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.

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Certification

Keysight Technologies certifies that this product met its published specifications at the time of shipment. Keysight further certifies that its calibration measurements are traceable to the United States National Institute of Standard and Technology (formerly National Bureau of Standards), to the extent allowed by that organization’s calibration facility, and to the calibration facilities of other International Standards Organization members.

Warranty Information

This Keysight Technologies hardware product is warranted against defects in material and workmanship for a period of 3 years from date of delivery. Keysight software and firmware products, which are designated by Keysight for use with a hardware product and when properly installed on that hardware product, are warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery. During the warranty period, either Keysight or Keysight Technologies will, at its option, either repair or replace products which prove to be defective. Keysight does not warrant that operation the software, firmware, or hardware shall be uninterrupted or error free.

For warranty service, with the exception of warranty options, this product must be returned to the nearest service center designated by Keysight. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products returned to Keysight for warranty service. Except for the products returned to Customer from another country, Keysight shall pay for return of products to Customer.

Warranty services outside the country of initial purchase are included in Keysight's product price, only if Customer pays Keysight international prices (defined as destination local currency price, or U.S. or Geneva Export price).

If Keysight is unable, within a reasonable time, to repair or replace any product to condition as warranted, the Customer shall be entitled to a refund of the purchase price upon return of the product to Keysight.

The warranty period begins on the date of delivery or on the date of installation if installed by Keysight.

Keysight E3633A and E3634A User’s Guide 3

Limitation of Warranty

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation or maintenance. NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. KEYSIGHT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

For consumer transactions in Australia and New Zealand:

The warranty terms contained in this statement, except to the extent lawfully permitted, do not exclude, restrict or modify and are in addition to the mandatory rights applicable to the sale of this product to you.

Exclusive Remedies

THE REMEDIES PROVIDED HEREIN ARE BUYER’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

The above statements apply only to 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's full line of Support Programs.

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Safety Symbols

The following symbols on the instrument and in the documentation indicate precautions which must be taken to maintain safe operation of the instrument.

Caution, risk of danger (refer to this manual for specific Warning or Caution information)

Protective conductor terminal Alternating current (AC)

Earth (ground) terminal Out position of a bi-stable push control

Frame or chassis terminal In position of a bi-stable push control

Positive binding post Negative binding post

Direct current (DC)

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Safety Considerations

CAUTION

Read the information below before using this instrument.

The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards for design, manufacture, and intended use of the instrument. Keysight Technologies assumes no liability for the customer’s failure to comply with these requirements.

BEFORE APPLYING POWER.

Verify that the product is set to match the available line voltage and that the correct fuse is installed.

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 cabinet must be connected to an electrical ground. The instrument must be connected to the AC power supply mains through a three-conductor power cable, with the third wire firmly connected to an electrical ground (safety ground) at the power outlet. Any interruption of the protective (grounding) conductor or d isconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury. If the instrument is to be energized via an external autotransformer for voltage reduction, be certain that the autotransformer common terminal is connected to the neutral (earthed pole) of the AC power lines (supply mains).

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE.

Do not operate the instrument in the presence of flammable gases or fumes.

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CAUTION

KEEP AWAY FROM LIVE CIRCUITS.

CAUTION

NOTE

Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made by qualified service personnel. Do not replace components with power cable connected. Under certain conditions, dangerous voltages may exist even with the power cable removed. To avoid injuries, always disconnect power, discharge circuits and remove external voltage sources before touching components.

DO NOT SERVICE OR ADJUST ALONE.

Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present.

DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT.

Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the instrument. Return the instrument to a Keysight Technologies Sales and Service Office for service and repair to ensure that safety features are maintained.

Instruments that appear damaged or defective should be made inoperative and secured against unintended operation until they can be repaired by qualified service personnel.

Keysight E3633A and E3634A User’s Guide 7

Regulatory Markings

The CE marking is a legal compliance marking of the European Community. This CE marking shows that the product complies with all the relevant European Legal Directives.

The RCM mark is a registered trademark of the Australian Communications and Media Authority.

ICES/NMB-001 indicates that this ISM device complies with the Canadian ICES-001. Cet appareil ISM est conforme a la norme NMB-001 du Canada.

This instrument complies with the WEEE Directive (2002/96/EC) marking requirement. This affixed product label indicates that you must not discard this electrical or electronic product in domestic household waste.

The CSA mark is a registered trademark of the Canadian Standards Association.

This symbol indicates the time period during which no hazardous or toxic substance elements are expected to leak or deteriorate during normal use. Forty years is the expected useful life of the product.

This symbol is a South Korean Class A EMC Declaration. This is a Class A instrument suitable for professional use and in electromagnetic environment outside of the home.

8 Keysight E3633A and E3634A User’s Guide

Waste Electrical and Electronic Equipment (WEEE) Directive

This instrument complies with the WEEE Directive marking requirement. This affixed product label indicates that you must not discard this electrical or electronic product in domestic household waste.

Product category:

With reference to the equipment types in the WEEE directive Annex 1, this instrument is classified as a “Monitoring and Control Instrument” product.

The affixed product label is as shown below.

Do not dispose in domestic household waste.

To return this unwanted instrument, contact your nearest Keysight Service Center, or visit http://about.keysight.com/en/companyinfo/environment/takeback.shtml for more information.

Sales and Technical Support

To contact Keysight for sales and technical support, refer to the support links on the following Keysight websites:

– www.keysight.com/find/powersupply

(product-specific information and support, software and documentation updates)

– www.keysight.com/find/assist

(worldwide contact information for repair and service)

Keysight E3633A and E3634A User’s Guide 9

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10 Keysight E3633A and E3634A User’s Guide

Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Limitation of Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Exclusive Remedies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Regulatory Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Waste Electrical and Electronic Equipment (WEEE) Directive . . . . . . . . 9

Product category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

1 General Information

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Safety and EMC requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Initial inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Cooling and location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Product at a Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

The front panel at a glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Front-panel voltage and current limit settings . . . . . . . . . . . . . . . . .33

Display annunciators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

The rear panel at a glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

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Input Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Power-line cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Power-line voltage selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

2Initial Operation

Preliminary Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Power-on Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Output Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Voltage output checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Current output checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

3 Front-Panel Operation

Front-Panel Operation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Constant Voltage Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Constant Current Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Storing and Recalling Operating States . . . . . . . . . . . . . . . . . . . . . . . . 56

Programming Overvoltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Programming Overcurrent Protection . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Remote Voltage Sensing at the Front and Rear Terminals . . . . . . . . . . 67

CV regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Output rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Output noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Remote voltage sensing connections . . . . . . . . . . . . . . . . . . . . . . . . 68

Remote voltage sensing at the rear panel . . . . . . . . . . . . . . . . . . . . 70

Disabling the Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Disabling the Output Using an External Relay . . . . . . . . . . . . . . . . . . . 72

Knob Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

System-Related Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Error conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Display control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Firmware revision query . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

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SCPI language version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78

Remote Interface Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

Remote interface selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

HPIB address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

Baud rate selection (RS-232) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

Parity selection (RS-232) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

To set the HPIB Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81

To set the baud rate and parity (RS-232) . . . . . . . . . . . . . . . . . . . . .82

HPIB Interface Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

RS-232 Interface Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

RS-232 configuration overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

RS-232 Data Frame Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

Connection to a computer or terminal . . . . . . . . . . . . . . . . . . . . . . .86

DTR / DSR Handshake Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . .88

RS-232 troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

Calibration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90

Calibration security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90

Calibration count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97

Calibration Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98

4 Remote Interface Reference

SCPI Command Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100

Simplified Programming Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . .107

Using the APPLy command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107

Using the low-level commands . . . . . . . . . . . . . . . . . . . . . . . . . . . .107

Reading a query response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108

Selecting a trigger source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108

Power supply programming ranges . . . . . . . . . . . . . . . . . . . . . . . .109

Using the APPLy Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111

Output Setting and Operation Commands . . . . . . . . . . . . . . . . . . . . .113

Triggering Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .120

Trigger source choices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .120

Triggering commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122

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System-Related Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Calibration Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

RS-232 Interface Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

The SCPI Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

What is an event register? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

What is an enable register? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

SCPI Status System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

The questionable status register . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

The standard event register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

The status byte register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Using Service Request (SRQ) and serial POLL . . . . . . . . . . . . . . . . 137

Using *STB? to read the status byte . . . . . . . . . . . . . . . . . . . . . . . . 138

Using the Message Available bit (MAV) . . . . . . . . . . . . . . . . . . . . . 138

To interrupt your bus controller using SRQ . . . . . . . . . . . . . . . . . . 138

To determine when a command sequence is completed . . . . . . . . 139

Using *OPC to signal when data is in the output buffer . . . . . . . . . 139

Status Reporting Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

An Introduction to the SCPI Language . . . . . . . . . . . . . . . . . . . . . . . . 143

Command format used in this manual . . . . . . . . . . . . . . . . . . . . . . 144

Command separators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

Using the MIN and MAX parameters . . . . . . . . . . . . . . . . . . . . . . . 145

Querying parameter settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

SCPI command terminators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

IEEE-488.2 common commands . . . . . . . . . . . . . . . . . . . . . . . . . . 147

SCPI parameter types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

Halting an Output in Progress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

SCPI Conformance Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

SCPI confirmed commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

Non-SCPI commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

IEEE-488 Conformance Information . . . . . . . . . . . . . . . . . . . . . . . . . . 154

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5Error Messages

Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .156

Execution Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .157

Self-Test Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165

Calibration Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .167

6 Application Programs

Example Program for C and C++ . . . . . . . . . . . . . . . . . . . . . . . . . . . . .172

Diode.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .172

Example Program for Excel 97 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .176

Diode Macro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .178

Declaration for Windows 3.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180

Declaration for Windows 9.5/NT 4.0 . . . . . . . . . . . . . . . . . . . . . . . .180

7Tutorial

Overview of Keysight E3633A and Keysight E3634A Operation . . . . .182

Output Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .184

Unregulated state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186

Unwanted signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186

Connecting the Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .188

Output isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .188

Multiple loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .188

Remote voltage sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190

Load consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191

Extending the Voltage and Current Range . . . . . . . . . . . . . . . . . . . . .193

Series connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .193

Parallel connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .193

Remote Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .194

Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196

Keysight E3633A and E3634A User’s Guide 15

8Specifications

Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198

Transient response time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199

Command processing time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199

OVP and OCP accuracy, ±(% of output + offset) . . . . . . . . . . . . . . 199

Activation time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199

Supplemental Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200

Remote sensing capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200

Temperature coefficient, ±(% of output + offset) . . . . . . . . . . . . . . 200

Stability, ±(% of output + offset) . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

Output voltage overshoot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

Programming language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

State Storage Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

Recommended calibration interval . . . . . . . . . . . . . . . . . . . . . . . . . 201

Output Terminal Isolation (maximum, from chassis ground) . . . . . 201

AC input ratings (selectable via rear panel selector . . . . . . . . . . . . 202

Maximum input power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202

Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202

Operating temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202

Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202

Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203

Weight (MY53xx6xxx) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203

16 Keysight E3633A and E3634A User’s Guide

List of Figures

Figure 3-1 Recommended protection circuit

Figure 3-2 Remote voltage sensing connections . . . . . . . . . . . . .69

Figure 3-3 Rear local sensing connections . . . . . . . . . . . . . . . . . . . .70

Figure 7-1 Diagram of simple series power supply . . . . . . . . . . .182

Figure 7-2 Block diagram of the power supply

Figure 7-3 Ideal Constant Voltage Power Supply . . . . . . . . . . . .184

Figure 7-4 Ideal Constant Current Power Supply . . . . . . . . . . . .184

Figure 7-5 Output Characteristics . . . . . . . . . . . . . . . . . . . . . . . .185

Figure 7-6 Simplified diagram of common mode

Figure 7-7 Regulated power supply with remote sensing . . . . .190

Figure 7-8 Speed of response - programming up (full load) . . .194

Figure 7-9 Speed of response - programming down . . . . . . . . . 195

Figure 8-1 Dimensions of Keysight E3633A and E3634A

for battery charging . . . . . . . . . . . . . . . . . . . . . . . . .62

showing the isolation . . . . . . . . . . . . . . . . . . . . . .183

and normal mode sources of noise . . . . . . . . . . . .187

power supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . .203

Keysight E3633A and E3634A User’s Guide 17

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18 Keysight E3633A and E3634A User’s Guide

List of Tables

Table 4-1 Keysight E3633A programming ranges . . . . . . . . . . .109

Table 4-2 Keysight E3634A Programming Ranges . . . . . . . . . . 110

Table 4-3 Bit Definitions - Questionable Status Register . . . . .134

Table 4-4 Bit Definitions – Standard Event Register . . . . . . . . .135

Table 4-5 Bit-Definitions - Status Byte Summary Register . . . .136

Table 7-1 Wire rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .188

Table 7-2 Slew rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191

Table 8-1 Performance specifications . . . . . . . . . . . . . . . . . . . .198

Table 8-2 Supplemental Characteristics . . . . . . . . . . . . . . . . . .200

Keysight E3633A and E3634A User’s Guide 19

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20 Keysight E3633A and E3634A User’s Guide

Keysight E3633A and E3634A DC Power Supplies User’s Guide

1 General Information

Safety Considerations 22

Options and Accessories 23

Description 25

Installation 28

Product at a Glance 31

This is the User’s guide for your Keysight E3633A and E3634A DC power supplies. Unless otherwise stated, the information in this manual applies to both two models.

This chapter provides a general description of your power supply. This chapter also contains instructions for initial inspection, location and cooling for bench and rack operation, selecting the power-line voltage, and connecting your power supply to ac power.

1General Information

Safety Considerations

This power supply is a Safety Class I instrument, which means that it has a protective earth terminal. That terminal must be connected to earth ground through a power source with a 3-wire ground receptacle.

Before installation or operation, check the power supply and review this manual for safety markings and instructions. Safety information for specific procedures is located at the appropriate places in this manual. See also Safety Considerations at the beginning of this manual for general safety information.

Safety and EMC requirements

This power supply is designed to comply with the following safety and EMC (Electromagnetic Compatibility) requirements:

– Low Voltage Directive (2006/95/EC)

– EMC Directive (2004/108/EC)

Safety

– IEC 61010-1:2001 / EN 61010-1:2001

– CAN/CSA-C22.2 No. 61010-1-04

– ANSI/UL61010-1:2004

EMC

– IEC61326-1:2005 / EN61326-1:2006

– Canada: ICES/NMB-001: Issue 4, June 2006

– Australia/New Zealand: AS/NZS CISPR 11:2004

– EN 55011(1991) Group 1, Class A/CISPR 11(1990): Limits and Methods of

Radio Interference Characteristics of Industrial, Scientific, and Medical (ISM) Radio Frequency Equipment.

–ICES/NMB-001

This ISM device complies with Canadian ICES-001. Cet appareil ISM est conforme à la norme NMB-001 du Canada.

22 Keysight E3633A and E3634A User’s Guide

Options and Accessories

Options

Option 0EM, 0E3, and 0E9 determine which power-line voltage is selected at the factory. The standard unit is configured for 115 Vac ± 10%, 47-63 Hz input voltage.

For more information about changing the power-line voltage setting, see

“Power-line voltage selection” on page 36 in this chapter.

Option no. Description

0EM: 115 VAC ± 10%, 47-63 Hz Input

0E3: 230 VAC ± 10%, 47-63 Hz Input

0E9: 100 VAC ± 10%, 47-63 Hz Input

1CM: Rack mount kit (Keysight part number 5063-9243)

0L2: Extra English Manual set (local language manual files are included in the

CD-ROM (Keysight part number 5964-8251)

General Information 1

Keysight E3633A and E3634A User’s Guide 23

1General Information

Accessories

The accessories listed below may be ordered from your local Keysight Technologies Sales Office either with the power supply or separately.

Keysight part no. Description

10833A: GPIB cable, 1 meter (3.3 feet)

10833B: GPIB cable, 2 meter (6.6 feet)

34398A: RS-232, 9 pin (f) to 9 pin (f), 2.5 m (8.2 ft.) cable; plus 9 pin (m) to 25 pin (f)

34399A: RS-232 adapter kit (contains 4 adapters):

adapter

9 pin (m) to 25 pin (m) for use with PC or printer 9 pin (m) to 25 pin (f) for use with PC or printer 9 pin (m) to 25 pin (m) for use with modem 9 pin (m) to 9 pin (m) for use with modem

24 Keysight E3633A and E3634A User’s Guide

Description

General Information 1

The Keysight E3633A and Keysight E3634A DC power supplies feature a combination of programming capabilities and linear power supply performance that makes them ideal for power systems applications. The power supply is programmable locally from the front panel or remotely over the GPIB and RS-232 interfaces. This power supply has two ranges, allowing more voltage at a lower current. An output range needed is selected from the front panel or over the remote interfaces.

Operational features include:

– Dual range of single-output:

– 8V/20A and 20V/10A (Keysight E3633A)

– 25V/7A and 50V/4A (Keysight E3634A)

– Constant voltage (CV) or constant current (CC) operation

– Overvoltage protection (OVP) and overcurrent protection (OCP)

– Three storage locations (1 to 3) for user-defined operating states

– Automatic turn-on self-test

– Remote sensing for load voltage at the front or rear panel terminals

– User calibration from the front panel or over the remote interfaces

The front panel operation permits:

– Easy-to-use of knob control

– Output range selection

– Enabling or disabling OVP and OCP features

– Setting the OVP and OCP trip levels

– Clearing OVP and OCP conditions

– Setting and displaying the voltage and current limit values

– Saving and recalling operating states

– Returning the power supply to local mode from remote interface mode

– Retrieving/Scrolling error messages on the display

Keysight E3633A and E3634A User’s Guide 25

1General Information

– Calibrating the power supply, including changing the calibration secure code

– Configuring the power supply for remote interfaces

– Enabling or disabling the output

When operated over the remote interface, the power supply can be both a listener and a talker. Using an external controller, you can instruct the power supply to set the output and to send the status data back over the GPIB or RS-232. Capabilities include the following features:

– Voltage and current programming

– Voltage and current readback

– Present and stored status readback

– Programming syntax error detection

– Complete self-test

The front-panel VFD (Vacuum-Fluorescent Display) includes:

– Displaying actual values of output voltage and current (meter mode)

– Or displaying the limit values of voltage and current (limit mode)

– Checking the operating status from the annunciators

– Checking the type of error from the error codes (messages)

Connections to the power supply’s output and to chassis ground are made to binding posts on the front panel and to the rear output terminals.

26 Keysight E3633A and E3634A User’s Guide

General Information 1

WARNING

Floating the power supply output more than ±60 Vdc from the chassis presents an electric shock hazard to the operator. Do not float the outputs more than ±60 Vdc when metal shorting bars without insulation are used to connect the (+) output to the (+) sense and the (-) output to the (-) sense terminals.

Outputs can be floated to maximum of ±240 Vdc provided that the metal shorting bars without insulation are either replaced with insulated conductors or they are removed from the terminals so there is no operator access to the output conductors without insulation. All field wiring insulation must be adequate for the voltage present.

Keysight E3633A and E3634A User’s Guide 27

1General Information

The power supply is shipped with a detachable, 3-wire grounding type power cord.The ac line fuse is an extractor type on the rear panel. The power supply can be calibrated from the front panel directly or with a controller over the GPIB or RS-232 interface using calibration commands. Correction factors are stored in nonvolatile memory and are used during output programming. Calibration from the front panel or a controller eliminate the need to remove the top cover or even the need to remove the power supply from your system cabinet. You can guard against unauthorized calibration by using the “Secured” calibration protection function.

28 Keysight E3633A and E3634A User’s Guide

Installation

Initial inspection

General Information 1

When you receive your power supply, inspect it for any obvious damage that may have occurred during shipment. If any damage is found, notify the carrier and the nearest Keysight Sales Office immediately. Warranty information is shown in the front of this manual.

Keep the original packing materials in case the power supply has to be returned to Keysight Technologies in the future. If you return the power supply for service, attach a tag identifying the owner and model number. Also include a brief description of the problem.

Mechanical check

This check confirms that there are no broken keys or knob, that the cabinet and panel surfaces are free of dents and scratches, and that the display is not scratched or cracked.

Electrical check

Chapter 2 describes an initial operation procedure which, when successfully

completed, verifies to a high level of confidence that the power supply is operating in accordance with its specifications. Detailed electrical verification procedures are included in the Service Guide.

Cooling and location

Cooling

The power supply can operate without loss of performance within the temperature range of 0 °C to 40 °C, and with derated output current from 40 °C to 55 °C. A fan cools the power supply by drawing air through the rear panel and exhausting it out the sides. Using a Keysight rack mount will not impede the flow of air.

Bench operation

Your power supply must be installed in a location that allows sufficient space at the sides and rear of the power supply for adequate air circulation. The rubber bumpers must be removed for rack mounting.

Keysight E3633A and E3634A User’s Guide 29

1General Information

Rack mounting

The power supply can be mounted in a standard 19-inch rack cabinet using one of three optional kits available. A rack-mounting kit for a single instrument is available as Option 1CM (P/N 5063-9243). Installation instructions and hardware are included with each rack-mounting kit. Any Keysight System II instrument of the same size can be rack-mounted beside the Keysight E3633A or E3634A DC power supply.

Remove the front and rear bumpers before rack-mounting the power supply.

To remove the rubber bumper, pull the bumper off from the top as there are protrusions on the sides and bottom of the cover.

To rack mount a single instrument, order adapter kit 5063-9243.

30 Keysight E3633A and E3634A User’s Guide

General Information 1

To rack mount two instruments of the same depth side-by-side, order lock-link kit 5061-9694 and flange kit 5063-9214.

To install two instruments in a sliding support shelf, order support shel f 5063-9256, and slide kit 1494-0015.

Keysight E3633A and E3634A User’s Guide 31

1General Information

Product at a Glance

The front panel at a glance

1 8V/20A range selection key (E3633A)

25V/7A range selection key (E3634A)

2 20V/10A range selection key (E3633A)

50V/4A range selection key (E3634A)

3 Overvoltage protection key 11 Control knob

4 Overcurrent protection key 12 Resolution selection keys

5 Display key limit 13 Voltage/current adjust selection key

6 Recall operating state key

7 Store operating state/Local key

8 Error/Calibrate key

9 I/O Configuration key

10 Output On/Off key

32 Keysight E3633A and E3634A User’s Guide

General Information 1

1 8V/20A* or 25V/7A** range selection key Selects the 8V/20A or 25V/

7Arange and allows the full rated output to 8V/20A or 25V/7A.

2 20V/10A* or 50V/4A** range selection key Selects the 20V/10A or 50V/4A

range and allows the full rated output to 20V/10A or 50V/4A.

3 Overvoltage protection key Enables or disables the overvoltage protection

function, sets trip voltage level, and clears the overvoltage condition.

4 Overcurrent protection key Enables or disables the overcurrent protection

function, sets trip current level, and clears the overcurrent condition.

5 Display limit key Shows voltage and current limit values on the display and

allows knob adjustment for setting limit values.

6 Recall operating state key Recalls a previously stored operating state from

location “1”, “2”, or “3”.

7 Store operating state / Local key

[1]

Stores an operating state in location “1”, “2”, or “3” / or returns the power supply to local mode from remote interface mode.

8Error / Calibrate key

[2]

Displays error codes generated during operation, self-test and calibration / or enables calibration mode (the power supply must be unsecured before performing calibration). See Service Guide for more details on calibration.

9 I/O Configuration / Secure key

[3]

Configures the power supply for remote interfaces / or secure or unsecure the power supply for calibration. See Service Guide for more details on how to secure or unsecure the power supply.

10 Output On/Off key Enables or disables the power supply output. This key

toggles between on and off.

11 Control knob Increases or decreases the value of the blinking digit by turning

clockwise or counter clockwise.

12 Resolution selection keys Move the blinking digit to the right or left.

13 Voltage/current ad just selection key Selects the knob control function for

voltage or current adjustment.

[1] The key can be used as the “Local” key when the power supply is in the remote interface mode.

[2] You can enable the “calibration mode” by holding down this key when you turn on the power

supply.

[3] You can use it as the “Secure” or “Unsecure” key when the power supply is in the calibration mode.

Keysight E3633A and E3634A User’s Guide 33

1General Information

NOTE

Front-panel voltage and current limit settings

You can set the voltage and current limit values from the front panel using the following method.

Use the voltage/current adjust selection key, the resolution selection keys, and the control knob to change the voltage and current limit values.

1 Select the desired range using the range selection keys after turning on the

power supply.

2 Press the key to show the limit values on the display.

3 Move the blinking digit to the appropriate position using the resolution

selection keys and change the blinking digit value to the desired voltage limit by turning the control knob. If the display limit times out, press the key

again.

4 Set the knob to current control mode by pressing the key.

5 Move the blinking digit to the appropriate position using the resolution

selection keys and change the blinking digit value to the desired current limit by turning the control knob.

6 Press the key to enable the output. After about 5 seconds, the display will

go to output monitoring mode automatically to display the voltage and current at the output or the display will go to output monitoring mode immediately by

pressing the key again.

All front panel keys and controls can be disabled with remote interface commands. The Keysight E3633A and Keysight E3634A must be in "Local" mode for the front panel keys and controls to function.

34 Keysight E3633A and E3634A User’s Guide

Display annunciators

Adrs Power supply is addressed to listen or talk over a remote interface.

Rmt Power supply is in remote interface mode.

8V Shows the 8V/20A range is selected. (Keysight E3633A model)

20V Shows the 20V/10A range is selected. (Keysight E3633A model)

25V Shows the 25V/7A range is selected. (Keysight E3634A model)

50V Shows the 50V/4A range is selected. (Keysight E3634A model)

The overvoltage protection function is enabled when the annunciator turns on or the

OVP

OCP

CAL The power supply is in calibration mode.

Limit The display shows the limit values of voltage and current.

overvoltage protection circuit has caused the power supply to shutdown when the annunciator blinks.

The overcurrent protection function is enabled when the annunciator turns on or the overcurrent protection circuit has caused the power supply to shutdown when the annunciator blinks.

General Information 1

ERROR

OFF The output of the power supply is disabled (See page 52 for more information).

Unreg The output of the power supply is unregulated (output is neither CV nor CC).

CV The power supply is in constant voltage mode.

CC The power supply is in constant current mode.

Hardware or remote interface command errors are detected and the error bit has not been cleared.

To review the display annunciators, hold down key as you turn on the power supply.

Keysight E3633A and E3634A User’s Guide 35

1General Information

The rear panel at a glance

1 Power-line voltage setting 5 GPIB (IEEE-488) interface connection

2 Power-line fuse-holder assembly 6 RS-232 interface connector

3 AC inlet 7 Rear output terminals

4 Power-line module

Use the front-panel key to:

– Select the GPIB or RS-232 interface (see chapter 3).

– Set the GPIB bus address (see chapter 3).

– Set the RS-232 baud rate and parity (see chapter 3).

36 Keysight E3633A and E3634A User’s Guide

Input Power Requirements

You can operate your power supply from a nominal 100 V, 115 V, or 230 V single phase ac power source at 47 to 63 Hz. An indication on the rear panel shows the nominal input voltage set for the power supply at the factory. If necessary, you can change the power-line voltage setting according to the instructions on the next page

Power-line cord

The power supply is shipped from the factory with a power-line cord that has a plug appropriate for your location. Contact the nearest Keysight Sales and Service Office if the wrong power-line cord is included with your power supply. Your power supply is equipped with a 3-wire grounding type power cord; the third conductor being the ground. The power supply is grounded only when the power-line cord is plugged into an appropriate receptacle. Do not operate your power supply without adequate cabinet ground connection.

Power-line voltage selection

General Information 1

Power-line voltage selection is accomplished by adjusting two components: power-line vol tage selector and power-line fuse on the power-line module of the rear panel. To change the power-line voltage, proceed as follows:

Keysight E3633A and E3634A User’s Guide 37

1General Information

1 Remove the power cord. Remove the fuse-holder assembly with a flat-blade screwdriver from the rear panel.

3 Rotate the power-line vol tage selector until the correct voltage appears.

2 Install the correct line fuse. Remove the power-line voltage selector from the power-line module.

4 Replace the power-line voltage selector and the fuse-holder assembly in the rear panel.

38 Keysight E3633A and E3634A User’s Guide

Keysight E3633A and E3634A DC Power Supplies

NOTE

User’s Guide

2 Initial Operation

Preliminary Checkout 40 Power-on Checkout 41 Output Checkout 43

There are three basic tests in this chapter. The automatic power-on test includes a self-test that checks the internal microprocessors and allows the user visually to check the display. The output check ensures that the power supply develops its rated outputs and properly responds to operation from the front panel. For complete performance and/or verification tests, refer to the Service Guide.

This chapter is intended for both the experienced and the inexperienced user because it calls attention to certain checks that should be made prior to operation.

Throughout this chapter the key to be pressed is shown in the left margin.

2Initial Operation

Preliminary Checkout

The following steps help you verify that the power supply is ready for use.

1 Check the list of supplied items.

Verify that you have received the following items with your power supply. If anything is missing, contact your nearest Keysight Technologies Sales Office.

– One power cord for your location.

– This User’s Guide.

– One Service Guide.

– Certificate of Calibration.

2 Verify the power-line voltage setting on the rear panel.

The power-line voltage is set to the proper value for your country when the power supply is shipped from the factory. Change the voltage setting if it is not correct. The settings are: 100, 115, or 230 Vac.

3 Verify that the correct power-line fuse is installed.

The correct fuse is installed for your country when the power supply is shipped from the factory. For 100 or 115 Vac operation, you must use a 6.3 AT fuse. For 230 Vac operation, you must use a 3.15 AT fuse.

4 Connect the power-line cord and turn on your power supply.

The front-panel display will light up and a power-on self-test occurs automatically when you turn on the power supply.

See “Power-line voltage selection” on page 37 if you need to change the power-line voltage or the power-line fuse.

To replace the 6.3 AT fuse, order Keysight part number 2110-1030.

To replace the 3.15 AT fuse, order Keysight part number 2110-1031.

40 Keysight E3633A and E3634A User’s Guide

Power-on Checkout

The power-on test includes an automatic self-test that checks the internal microprocessors and allows the user visually to check the display. You will observe the following sequence on the display after pressing the front panel power switch to on.

1 The front-panel display will light up briefly while the instrument performs

its power-on sel f-test.

To review the power-on display with all annunciators turned on, hold down

key as you turn on the power supply.

2 The GPIB address or RS-232 is also displayed for about one second.

ADDR (or RS-232)

The GPIB address is set to “5” when the power supply is shipped from the factory for remote interface configuration. If this is not the first time the power supply is turned on, a different interface (RS-232) or a different GPIB address may appear. See “Remote Interface Configuration” on page 79 if you need to

change the remote interface configuration.

Initial Operation 2

3The “8V”

[1]

or “25V”

[2]

, “OVP”, “OCP” and “OFF” annunciators are on. All

others are off.

The power supply will go into the power-on / reset state; the output is disabled (the OFF annunciator turns on); the 8V/20A (the 8V

[1]

or 25V

[2]

annunciator turns on); and the knob is selected for voltage

[1]

or 25V/7A

[2]

range is selected

control. Notice that the OVP and OCP annunciator also turn on.

[1] For Keysight E3633A Model

[2] For Keysight E3634A Model

Keysight E3633A and E3634A User’s Guide 41

2Initial Operation

NOTE

4 Enable the outputs.

The OFF annunciator turns off and the 8V annunciators are lit. The blinking digit can be adjusted by turning the knob. Notice that the display is in the meter mode. “Meter mode” means that the display shows the actual output voltage and current.

If the power supply detects an error during power-on self-test, the ERROR annunciator will turn on. See “Error Messages” on page 156

[1]

or 25V

[2]

, OVP, OCP, and CV

[1] For Keysight E3633A Model

[2] For Keysight E3634A Model

42 Keysight E3633A and E3634A User’s Guide

Output Checkout

The following procedures check to ensure that the power supply develops its rated outputs and properly responds to operation from the front panel. For complete performance and verification tests, refer to the Service Guide.

For each step, use the keys shown on the left margins.

Voltage output checkout

The following steps verify basic voltage functions with no load

1Turn on the power supply

The power supply will go into the power-on / reset state; the output is disabled (the OFF annunciator turns on); the 8V/20A (the 8V

control.

2 Enable the outputs.

[1]

or 25V

Initial Operation 2

[1]

or 25V/7A

[2]

annunciator turns on); and the knob is selected for voltage

[1]

or 25V

[2]

range is selected

[2]

OVP, OCP, and CV

3 Check that the front-panel voltmeter properly responds to knob control for

the 8V/20A

[1]

or 25V/7A

[2]

range.

Turn the knob clockwise or counter clockwise to check that the voltmeter responds to knob control and the ammeter indicates nearly zero.

4 Ensure that the voltage can be adjusted from zero to the full rated value.

Adjust the knob until the voltmeter indicates 0 volts and then adjust the knob until the voltmeter indicates “8.0 volts”

[1] For Keysight E3633A Model

[2] For Keysight E3634A Model

[1]

or “25.0 volts”

[2]

Keysight E3633A and E3634A User’s Guide 43

2Initial Operation

NOTE

You can use the resolution selection keys to move the blinking digit to the right or left when setting the voltage.

44 Keysight E3633A and E3634A User’s Guide

Current output checkout

The following steps check basic current functions with a short across the power supply’s output.

1Turn on the power supply.

The power supply will go into the power-on / reset state; the output is disabled (the OFF annunciator turns on); the 8V/20A (the 8V

[1]

or 25V

control.

2 Connect a short across (+) and (-) output terminals with an insulated test

lead.

Use a wire size sufficient to handle the maximum current (See Table 7-1).

3 Enable the output

The OFF annunciator turns off and the 8V annunciators are lit. The CV or CC annunciator turns on depending on the resistance of the test lead. The blinking digit can be adjusted by turning the knob. Notice that the display is in the meter mode. “Meter mode” means that the display shows the actual output voltage and current.

[2]

Initial Operation 2

[1]

or 25V/7A

[2]

range is selected

annunciator turns on); and the knob is selected for voltage

[1]

or 25V

[2]

, OVP, and OCP

4 Adjust the voltage limit to 1.0 volt

Set the display to the limit mode (the Limit annunciator will be blinking). Adjust the voltage limit to 1.0 volt to assure CC operation. The CC annunciator

will turn on. To go back to normal mode, press the key again or let the display time out for several seconds.

[1] For Keysight E3633A Model

[2] For Keysight E3634A Model

Keysight E3633A and E3634A User’s Guide 45

2Initial Operation

NOTE

5 Set the knob to the current control to check that the front-panel ammeter

properly responds to knob control.

Turn the knob clockwise or counter clockwise when the display is in the meter mode (the Limit annunciator is off). Check that the ammeter responds to knob control and the voltmeter indicates nearly zero (the voltmeter will show the voltage drop caused by the test lead).

6 Ensure that the current can be adjusted from zero to the full rated value.

Adjust the knob until the ammeter indicates 0 amps and then until the ammeter indicates 20.0 amps

7 Turn off the power supply and remove the short from the output.

You can use the resolution selection keys to move the blinking digit to the right or left when setting the current.

If an error has been detected during the output checkout procedures, the ERROR annunciator will turn on. See “Error Messages” on page 156.

[1]

or 7.0 amps

[2]

[1] For Keysight E3633A Model

[2] For Keysight E3634A Model

46 Keysight E3633A and E3634A User’s Guide

Keysight E3633A and E3634A DC Power Supplies

NOTE

User’s Guide

3 Front-Panel Operation

Front-Panel Operation Overview 48 Constant Voltage Operation 50 Constant Current Operation 53 Storing and Recalling Operating States 56 Programming Overvoltage Protection 58 Programming Overcurrent Protection 63 Remote Voltage Sensing at the Front and Rear Terminals 67 Disabling the Output 71 Disabling the Output Using an External Relay 72 Knob Locking 73 System-Related Operations 74 Remote Interface Configuration 79 HPIB Interface Configuration 84 RS-232 Interface Configuration 85 Calibration Overview 90

So far you have learned how to install your power supply and perform initial operation. During the initial operation, you were briefly introduced to operating from the front panel as you learned how to check basic voltage and current functions. This chapter will describe in detail the use of these front-panel keys and show how they are used to accomplish power supply operation.

Throughout this chapter the key to be pressed is shown in the left margin.

See “Error Messages” on page 156 if you encounter any errors during front-panel operation.

3 Front-Panel Operation

Front-Panel Operation Overview

The following section describes an overview of the front-panel keys before operating your power supply.

– The power supply is shipped from the factory configured in the front-panel

operation mode. At power-on, the power supply is automatically set to operate in the front-panel operation mode. When in this mode, the front-panel keys can be used. When the power supply is in remote operation mode, you can return to front-panel operation mode at any time by pressing the (Local) key if you did not previously send the front-panel lockout command. A change between front-panel and remote operation modes will not result in a change in the output parameters

– The power supply has two output ranges. This feature allows more voltage at a

lower current or more current at a lower voltage. The desired output range is selected from the front panel or over the remote interfaces. The 8V or 20V for the E3633A and 25V or 50V for the E3634A annunciator indicates the presently selected range.

– When you press key (the Limit annunciator blinks), the display of the

power supply goes to the limit mode and the present limit values will be displayed. In this mode, you can also observe the change of the limit values

when adjusting the knob. If you press the key again or let the display time-out after several seconds, the power supply will return the display to the meter mode (the Limit annunciator turns off). In this mode, the actual output voltage and current will be displayed.

– The output of the power supply can be enabled or disabled from the front

panel by pressing key. When the output is off, the OFF annunciator turns on and the output is disabled.

48 Keysight E3633A and E3634A User’s Guide

Front-Panel Operation 3

– The display provides the present operating status of the power supply with

annunciators and also informs the user of error codes. For example, the power

[1]

supply is operating in CV mode in the 8V/20A

or 25V/7A

controlled from the front panel, then the CV and 8V

[1]

[2]

or 25V

range and

[2]

annunciators

will turn on. If, however, the power supply is remotely controlled, the Rmt annunciator will also turn on, and when the power supply is being addressed over HPIB interface, the Adrs annunciator will turn on. See “Display

annunciators” on page 35 for more information.

[1] For Keysight E3633A Model

[2] For Keysight E3634A Model

Keysight E3633A and E3634A User’s Guide 49

3 Front-Panel Operation

NOTE

Constant Voltage Operation

To setup the power supply for constant voltage (CV) operation, proceed as follows.

– Front-panel operation:

1 Connect a load to the output terminals

With the power-off, connect a load to the (+) and (-) output terminals.

2 Turn on the power supply

The power supply will go into the power-on / reset state; the output is disabled (the OFF annunciator turns on); the 8V/20A is selected (the 8V selected for voltage control. Press

power supply in the 20V/10A* or 50V/4A** range before proceeding to the next step. The 20V

[1]

or 25V

[1]

or 50V

[1]

or 25V/7A

[2]

annunciator turns on); and the knob is

[1]

[2]

annunciator turns on.

[2]

key to operate the

[2]

range

3 Set the display to the limit mode

Notice that the Limit annunciator blinks, indicating that the display is in the limit mode. When the display is in the limit mode, you can see the voltage and current limit values of the power supply.

In constant voltage mode, the voltage values between the meter and limit modes are the same, but the current values are not. Moreover, if the display is in the meter mode, you cannot see the change of current limit value when adjusting the knob. We recommend that you should set the display to “limit” mode to see the change of current limit value in the constant voltage mode whenever adjusting the knob.

[1] For Keysight E3633A Model

[2] For Keysight E3634A Model

50 Keysight E3633A and E3634A User’s Guide

Front-Panel Operation 3

NOTE

4 Adjust the knob for the desired current limit.

Check that the Limit annunciator still blinks. Set the knob for current control. The second digit of the ammeter will be blinking. The blinking digit can be changed using the resolution selection keys and the blinking digit can be adjusted by turning the knob. Adjust the knob to the desired current limit.

5 Adjust the knob for the desired output voltage.

Check that the Limit annunciator still blinks. Set the knob for voltage control. The second digit of the voltmeter will be blinking. Change the

blinking digit using the resolution selection keys and adjust the knob to the desired output voltage.

6 Return to the meter mode.

Press key or let the display time-out after several seconds to return to the meter mode. Notice that the Limit annunciator turns off and the displays shows “OUTPUT OFF” message.

7 Enable the output.

The OFF annunciator turns off and the 8V

[1]

(or 25V

[2]

) or 20V

[1]

(or 50V

[2]

OVP, OCP and CV annunciators are lit. Notice that the display is in the meter mode. In the meter mode, the display shows the actual output voltage and current.

Refer to “Programming Overvoltage Protection” on page 58 and

“Programming Overcurrent Protection” on page 63 for more information on

OVP and OCP annunciators.

You can use the resolution selection keys to move the blinking digit to the right or left when setting voltage.

[1] For Keysight E3633A Model

[2] For Keysight E3634A Model

Keysight E3633A and E3634A User’s Guide 51

3 Front-Panel Operation

NOTE

8 Verify that the power supply is in the constant voltage mode.

If you operate the power supply in the constant voltage (CV) mode, verify that the CV annunciator is lit. If the CC annunciator is lit, choose a higher current limit.

During actual CV operation, if a load change causes the current limit to be exceeded, the power supply will automatically crossover to the constant current mode at the preset current limit and the output voltage will drop proportionately.

– Remote interface operation:

CURRent {<current>|MIN|MAX} Set the current

VOLTage {<voltage>|MIN|MAX} Set the voltage

OUTput ON Enable the output

You can use the resolution selection keys to move the blinking digit to the right or left when setting voltage.

52 Keysight E3633A and E3634A User’s Guide

Constant Current Operation

NOTE

To set up the power supply for constant current (CC) operation, proceed as follows.

– Front-panel operation:

1 Connect a load to the output terminals.

With power-off, connect a load to the (+) and (-) output terminals.

2 Turn on the power supply

The power supply will go into the power-on / reset state; the output is disabled (the OFF annunciator turns on); the 8V/20A is selected (the 8V

selected for voltage control.

To operate the power supply in the 20V/10A

[1]

[2]

50V

annunciator turns on.

Front-Panel Operation 3

[1]

or 25V/7A

[1]

or 25V

[2]

key before proceeding to the next step. The 20V

[2]

annunciator turns on); and the knob is

[1]

or 50V/4A

[2]

range, press

[2]

range

[1]

3 Set the display to the limit mode.

In constant current mode, the current values between the meter mode and limit mode are the same, but the voltage values are not. Moreover, if the d isplay is in the meter mode, you cannot see the change of voltage limit value when adjusting the knob. We recommend that you should set the display to “limit” mode to see the change of voltage limit value in the constant current mode whenever adjusting the knob.

[1] For Keysight E3633A Model

[2] For Keysight E3634A Model

Keysight E3633A and E3634A User’s Guide 53

3 Front-Panel Operation

NOTE

4 Adjust the knob for the desired voltage limit.

Check that the Limit annunciator still blinks and the second digit of voltmeter blinks to indicate the knob is selected for voltage control.The blinking digit can be changed using the resolution keys and the blinking digit can be adjusted by turning the knob. Adjust the knob for the desired voltage limit.

5 Adjust the knob for the desired output current.

Check that the Limit annunciator still blinks. Set the knob for current

control. The second digit of the ammeter will be blinking. Change the blinking digit using the resolution selection keys and adjust the knob to the desired output current.

6 Return to the meter mode.

Press key or let the display time-out after several seconds to return to the meter mode. Notice that the Limit annunciator turns off and the display shows “OUTPUT OFF” message.

7 Enable the output.

The OFF annunciator turns off and the 8V

[1]

(or 25V

[2]

) or 20V

[1]

(or 50V

[2]

OVP, OCP and CC annunciators are lit. Notice that the display is in the meter mode. In the meter mode, the display shows the actual output voltage and current.

Refer to “Programming Overvoltage Protection” on page 58 and

“Programming Overcurrent Protection” on page 63 for more information on

OVP and OCP annunciators.

You can use the resolution selection keys to move the blinking digit to the right or left when setting the voltage.

[1] For Keysight E3633A Model

[2] For Keysight E3634A Model

54 Keysight E3633A and E3634A User’s Guide

Front-Panel Operation 3

NOTE

8 Verify that the power supply is in the constant current mode.

If you operate the power supply in the constant current (CC) mode, verify that the CC annunciator is lit. If the CV annunciator is lit, choose a higher voltage limit.

During actual CC operation, if a load change causes the voltage limit to be exceeded, the power supply will automatically crossover to constant voltage mode at the preset voltage limit and the output current will drop proportionately.

– Remote interface operation:

CURRent {<current>|MIN|MAX} Set the current

VOLTage {<voltage>|MIN|MAX} Set the voltage

OUTput ON Enable the output

You can use the resolution selection keys to move the blinking digit to the right or left when setting voltage.

Keysight E3633A and E3634A User’s Guide 55

3 Front-Panel Operation

Storing and Recalling Operating States

You can store up to three different operating states in non-volatile memory. This also enables you to recall the entire instrument configuration with just a few key presses from the front panel.

The memory locations are supplied with the reset states from the factory for front-panel operation. Refer to the description of “*RST” on page 126 for more information. The following steps show you how to store and recall an operating state.

– Front-panel operation:

1 Set up the power supply for the desired operating state.

The storage feature “remembers” output range selection, the limit value settings of voltage and current, output on/off state, OVP and OCT on/off state and OVP and OCP trip levels.

2Turn on the storage mode.

Three memory locations (numbered 1, 2 and 3) are available to store the operating states. The operating states are stored in non-volatile memory and are remembered when being recalled.

STORE 1

This message appears on the display for approximately 3 seconds.

3 Store the operating state in memory location “3”.

Turn the knob to the right to specify the memory location 3.

STORE 3

To cancel the store operation, let the display time-out after about 3 seconds or press any other function key except the ion key except the

key. The power supply returns to the normal operating mode and to the function pressed. Save the operating state.

56 Keysight E3633A and E3634A User’s Guide

Front-Panel Operation 3

4 Save the operating state.

The operating state is now stored. To recall the stored state, go to the following steps.

DONE

5Turn on the recall mode.

Memory location “1” will be displayed in the recall mode.

RECALL 1

This message appears on the display for approximately 3 seconds.

6 Recall the stored operating state.

Turn the knob to the right to change the displayed storage location to 3.

RECALL 3

If this setting is not followed within 3 seconds with key stroke, the power supply returns to normal operating mode and will not recall the instrument state 3 from memory.

7 Restore the operating state.

The power supply should now be configured in the same state as when you stored the state on the previous steps.

DONE

This message appears on the display for approximately 1 second.

– Remote interface operation:

*SAL {1|2|3} Store an operating state to a specified location

*RCL {1|2|3} Recall a previously stored state from a specified location

Keysight E3633A and E3634A User’s Guide 57

3 Front-Panel Operation

Programming Overvoltage Protection

Overvoltage protection guards the load against output voltages that reach a specified value greater than the programmed protection level. It is accomplished by shorting the output via an internal SCR when the trip level is set to equal or greater than 3 volts, or by programming the output to 1 volt when the trip level is set to less than 3 volts.

The following steps show how to set the OVP trip level, how to check OVP operation, and how to clear overvoltage condition.

– Front-panel operation:

Setting the OVP level and enable the OVP circuit

1 Turn on the power supply.

The power supply will go into the power-on / reset state; the output is disabled (the OFF annunciator turns on); the 8V/20A (the 8V

control.

[1]

or 25V

[2]

annunciator turns on); and the knob is selected for voltage

[1]

or 25V/7A

[2]

range is selected

2 Enable the output.

The OFF annunciator turns off and the display will go to the meter mode.

3 Enter the OVP menu and set the trip level.

LEVEL 22.0V (E3633A)

LEVEL 55.0V (E3634A)

You will see the above message on the display when you enter the OVP menu. Adjust the control knob for the desired OVP trip level.

Note that you cannot set the trip levels to lower than 1.0 volt.

[1] For Keysight E3633A Model

[2] For Keysight E3634A Model

58 Keysight E3633A and E3634A User’s Guide

Front-Panel Operation 3

4 Enable the OVP circuit.

OVP ON

You will see the above message after pressing key.

5 Exit the OVP menu.

CHANGED

The “CHANGED” message is highlighted for a second to show that the new OVP trip level is now in effect. If the OVP settings are not changed, “NO CHANGE” will be displayed. The power supply will exit the OVP menu and the display will return to the meter mode. Check that the OVP annunciator turns on.

Checking OVP operation

To check OVP operation, raise the output voltage to near the trip point. Then very gradually increase the output by turning the knob until the OVP circuit trips. This will cause the power supply output to drop to near zero, the OVP annunciator to blink, and the CC annunciator to turn on. The “OVP TRIPPED” message also appears on the display.

Clearing the overvoltage condition

When the OVP condition occurs (the “OVP TRIPPED” message is shown on the display), the OVP annunciator blinks. When it was caused by an external voltage source such as a battery, disconnect it first. Clear the overvoltage condition by adjusting output voltage level or by adjusting OVP trip level.

The following steps show how to clear the overvoltage condition and get back to normal mode operation. In the following steps, the display will go back to “OVP TRIPPED” if you let the display time out after about several seconds.

Keysight E3633A and E3634A User’s Guide 59

3 Front-Panel Operation

– Adjust the output voltage level

1 Lower the output voltage level.

Lower the output voltage level below the OVP trip point after pressing key. The OVP and Limit annunciators are blinking.

2 Move to the clear mode.

Press key twice to move to the OVP CLEAR mode. The “OVP ON” message appears on the display. Turn the knob to the right until the above message appears on the display.

3 Clear the overvoltage condition and exit this menu.

Now, when you press key again, the “DONE” message is displayed for a second and the OVP annunciator will not blink any more. The output will return to meter mode.

OVP CLEAR

60 Keysight E3633A and E3634A User’s Guide

Front-Panel Operation 3

NOTE

– Adjust OVP trip level

1 Raise the OVP trip level.

Press key and turn the knob to raise the OVP trip level.

2 Move to the OVP CLEAR mode.

OVP CLEAR

Press key to move the OVP clear mode. The “OVP ON” message appears on the display. Turn the knob to the right until the above message appears on the display.

3 Clear the overvoltage cond ition and exit this menu.

Now, when you press key again, the “DONE” message is displayed for a second and the OVP annunciator will not blink any more. The output will return to the meter mode.

– Remote interface operation:

VOLT:PROT {<voltage>|MIN|MAX} Set the OVP level

VOLT:PROT:STAT|{OFF|ON} Disable or enable the OVP circuit

VOLT:PROT:CLE Clear the tripper OVP circuit

The power supply’s OVP circuit contains a crowbar SCR, which effectively shorts the output of the power supply whenever the overvoltage condition occurs. If external voltage source such as a battery is connected across the output, and the overvoltage condition inad vertently occurs, the SCR will continuously sink a large current from the source; possibly damaging the power supply. To avoid this a diode must be connected in series with the output as shown in Figure 3-1 on next page.

Keysight E3633A and E3634A User’s Guide 61

3 Front-Panel Operation

Figure 3-1 Recommended protection circuit for battery charging

62 Keysight E3633A and E3634A User’s Guide

Programming Overcurrent Protection

Overcurrent protection guards the load against output currents that reach a specified value greater than the programmed protection level. It is accomplished by programming the output current to zero.

The following steps show how to set the overcurrent protection trip level, how to check OCP operation and how to clear overcurrent condition.

– Front-panel operation:

Setting the OCP level and enable the OCP circuit

1Turn on the power supply.

The power supply will go into the power-on / reset state; the output is disabled (the OFF annunciator turns on); the 8V/20A (the 8V

control.

[1]

or 25V

[2]

annunciator turns on); and the knob is selected for voltage

Front-Panel Operation 3

[1]

or 25V/7A

[2]

range is selected

2 Enable the output.

The OFF annunciator turns off and the display will go to the meter mode.

3 Enter the OCP menu and set the trip level.

LEVEL 22.0 A (E3633A)

LEVEL 7.5 A (E3634A)

You will see the above message on the display when you enter the OCP menu. Adjust the knob for the desired OCP trip level.

[1] For Keysight E3633A Model

[2] For Keysight E3634A Model

Keysight E3633A and E3634A User’s Guide 63

3 Front-Panel Operation

4Enable the OCP circuit

OCP ON

You will see the above message after pressing the key.

5 Exit the OCP menu.

CHANGED

The “CHANGED” message is displayed for a second to show that the new OCP trip level is now in effect. If the OCP settings are not changed, “NO CHANGE” will be displayed. The power supply will exit the OCP menu and the display will return to the meter mode. Check that the OCP annunciator turns on.

Checking OCP operation

To check OCP operation, raise the output current to near the trip point. Then very gradually increase the output by turning the knob until the OCP circuit trips. This will cause the power supply’s output current to drop to zero and the OCP annunciator to blink. The “OCP TRIPPED” message also appears on the display.

Clearing the overcurrent condition

When the OCP condition occurs (the “OCP TRIPPED” message is shown on the display), the OCP annunciator blinks. When it was caused by external voltage sources such as a battery, disconnect it first. Clear the overcurrent condition by adjusting output current level or by adjusting OCP trip level.

The following steps show how to clear the overcurrent condition and get back to normal mode operation. In the following steps, the display will go back to “OCP TRIPPED” if you let the display time out after about several seconds.

64 Keysight E3633A and E3634A User’s Guide

Front-Panel Operation 3

– Adjust output current level

1 Lower the output current level.

Press key and set the knob for current control by pressing key then lower the output current level below the OCP trip point.

2 Move to the clear mode.

OCP CLEAR

Press key twice to move to the OCP CLEAR mode. The “OCP ON” message appears on the display. Turn the knob to the right until the above message appears on the display

3 Clear the overcurrent condition and exit this menu.

Now, when you press key again, the “DONE” message is displayed for a second and the OCP annunciator will not blink any more. The output will return to meter mode. The knob is selected for current control.

Notice that the power supply is operated in the constant current (CC) mode.

Keysight E3633A and E3634A User’s Guide 65

3 Front-Panel Operation

– Adjust OCP trip level

1 Raise the OCP trip level.

Press key and turn the knob to raise the OCP trip level.

2 Move to the OCP CLEAR mode.

Press the key to move to the OCP CLEAR mode. The “OCP ON” message appears on the display. Turn the knob to the right until the above message appears on the display.

3 Clear the overcurrent condition and exit this menu.

Now, when you press again, the “DONE” message is displayed for a second and the OCP annunciator will not blink any more. The output will return the meter mode.

OCP CLEAR

– Remote interface operation:

CURR:PROT {<current>|MIN|MAX} Set the OCP level

CURR:PROT:STAT {OFF|ON} Disable or enable the OCP circuit

CURR:PROT:CLE Clear the tripped OCP circuit

66 Keysight E3633A and E3634A User’s Guide

Front-Panel Operation 3

Remote Voltage Sensing at the Front and Rear Terminals

Remote voltage sensing is used to maintain regulation at the load and reduce the degradation of regulation that would occur due to the voltage drop in the leads between the power supply and the load.

By connecting the power supply for remote voltage sensing, voltage is sensed at the load rather than at the power supply’s output terminals. This will allow the power supply to automatically compensate for the voltage drop in applications with long lead lengths as well as to accurately read back the voltage directly across the load.

When the power supply is connected for remote sensing, the OVP circuit senses the voltage at the sensing points (load) and not the output terminals.

CV regulation

The voltage load regulation specification in chapter 8 applies at the output terminals of the power supply. When remote sensing, add 5 mV to this specification for each 1V drop between the positive sensing point and (+) output terminal due to the change in load current. Because the sense leads are part of the power supply’s feedback path, keep the resistance of the sense leads at or below 0.5Ω per lead to maintain the above specified performance.

Output rating

The rated output voltage and current specifications in chapter 8 apply at the output terminals of the power supply. With remote sensing, any voltage dropped in the load leads must be added to the load voltage to calculate maximum output voltage. The performance specifications are not guaranteed when the maximum output voltage is exceeded. If the excessive demand on the power supply forces the power supply to lose regulation, the Unreg annunciator will turn on to indicate that the output is unregulated.

Keysight E3633A and E3634A User’s Guide 67

3 Front-Panel Operation

Output noise

Any noise picked up on the sense leads also appears at the output of the power supply and may adversely affect the voltage load regulation. Twist the sense leads to minimize external noise pickup and run them parallel and close to the load leads. In noisy environments it may be necessary to shield the sense leads. Ground the shield at the power supply end only. Do not use the shield as one of

the sense conductors.

Stability

Using remote sensing under certain combinations of load lead lengths and large load capacitances may cause your application to form a filter, which becomes part of the voltage feedback loop. The extra phase shift created by this filter can degrade the power supply’s stability, resulting in poor transient response or loop instability. In severe cases, it may cause oscillations. To minimize this possibility, keep the load leads as short as possible and twist them together. As the sense leads are part of the power supply’s programming feedback loop, accidental open-connections of sense or load leads during remote sensing operation have various unwanted effects. Provide secure and permanent connections.

Remote voltage sensing connections

Connections between the power supply sensing and output terminals should be removed, and using shielded two-wire cable, the power supply sensing terminals should be connected to the load as shown in Figure 3-2. Do not use the shield as one of the sensing conductors and the other end should be left unconnected.

Connect one end of the sensing lead shield to the chassis ground ( Opening a sensing lead causes the power supply output voltage to decrease at

the load leads. Observe polarity when connecting the sensing leads to the load.

For local voltage sensing connections, the (+) and (-) sense terminals must be connected to the (+) and (-) output terminals respectively.

68 Keysight E3633A and E3634A User’s Guide

⊥

) only.

Front-Panel Operation 3

NOTE

When you make the remote voltage sensing connections at the front or rear panel terminals, make sure to disconnect all the connections to the load and sense leads at the other end terminals. Do not make the sensing connections at both front and rear terminals at the same time. It will cause to damage the power supply seriously.

During remote sensing setup, it is strongly recommended to power off (by pressing power ON/OFF button) the power supply to avoid undesirable damage to the load or the power supply.

Figure 3-2 Remote voltage sensing connections

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NOTE

Remote voltage sensing at the rear panel

External sense terminals are also available on the back of the power supply that allow the rear output voltages to be sensed at the load, which compensates for impedance losses in the load wiring. The front panel binding posts are paralleled with the rear output terminals.

The rear output terminals accept wires sizes from AWG 22 to AWG 10.

To minimize the possibility of instability on the output, keep load leads as short as possible and bundle or twist the leads tightly together to minimize inductance.

Figure 3-3 Rear local sensing connections

For rear local voltage sensing connections, the front shorting bars must be removed first and connect the sense wires as shown in Figure 3-3.

70 Keysight E3633A and E3634A User’s Guide

Disabling the Output

NOTE

The output of the power supply can be disabled or enabled from the front panel. When the power supply is in the “Off” state, the OFF annunciator turns on and the output is disabled. The OFF annunciator turns off when the power supply returns to the “On” state. When the output is disabled, the voltage value is 0 volts and the current value is 0.02 amps.

The output state is stored in volatile memory; the output is always disabled when power has been off or after a remote interface reset.

While the output is disabled, the range of selection keys, the control knob, the resolution selection keys, and adjust selection key are still working. If the display is in the meter mode, you cannot see the changes of output voltage and current settings on the display when turning the knob. To see or check the changes when the outputs are disabled, the display should be in the limit mode.

– Front-panel operation:

You can disable the output by pressing key. This key toggles between output “Off” and “On” states.

Front-Panel Operation 3

– Remote interface operation:

OUTP {OFF|ON} Disable or enable the output

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NOTE

Disabling the Output Using an External Relay

When the output of the power supply is turned off, it is implemented by setting the output to 0 volts and 0.02 amps. This gives a zero output voltage without actually disconnecting the output. To disconnect the output an external relay must be connected between the output and the load. A TTL signal of either low true or high true is provided to control an external relay. This signal can only be controlled with the remote command OUTPut:RELay {OFF|ON}. The TTL output is available on the RS-232 connection pin 1 and pin 9.

When the OUTPut:RELay state is “ON”, the TTL output of pin 1 is high (4.5 V) and pin 9 is low (0.5 V). The levels are reversed when the OUTPut:RELay state is “OFF”.

– TTL output of pin 1 or pin 9 of the RS-232 connector is available only after

installing two jumpers inside the power supply. See the Service Guide for more information.

– Do not use the RS-232 interface if you have configured the power supply to

output relay control signals. Internal components on the RS-232 circuitry may be damaged.

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Knob Locking

The control knob can be locked to prevent from any unwanted changes occurring during an experiment, or when you leave the power supply unattended. To lock the knob, move the blinking digit to the right or left using the resolution selection

key or until the blinking digit disappears.

Notice that the knob and front panel keys are disabled when in the remote interface mode.

Front-Panel Operation 3

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System-Related Operations

This section gives information on topics such as self-test, error conditions, and front-panel display control. This information is not directly related to setting up the power supply but is an important part of operating the power supply.

Self-test

A power-on self-test occurs automatically when you turn on the power supply. This test assures you that the power supply is operational. This test does not perform the extensive set of tests that are included as part of the complete self-test described below. If the power-on self-test fails, the ERROR annunciator turns on.

–A complete self-test performs a series of tests and takes approximately 2

seconds to execute. If all tests pass, you can have a high confidence that the power supply is operational.

–If the complete self-test is successful, “PASS” is displayed on the front

panel. If the self-test fails, “FAIL” is displayed and the ERROR annunciator turns on. See the Service Guide for instructions on returning the power supply to Keysight Technologies for service.

– Front-panel operation:

To perform the complete front panel self-test, hold down the key as you turn on the power supply and hold down the key until you hear a long beep. The self-test will begin when you release the key following the beep.

– Remote interface operation:

*TST?

Returns “0” if the complete self-test passes or “1” if it fails.

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Error conditions

When the front-panel ERROR annunciator turns on, one or more command syntax or hardware errors have been detected. A record of up to 20 errors can be stored in the power supply’s error queue. See “Error Messages” on page 156 for a complete listing of the errors.

– Errors are retrieved in first-in-first-out (FIFO) order. The first error returned

is the first error that was stored. Errors are cleared as you read them over the remote interface. When you have read all errors from the queue, the ERROR annunciator turns off. The power supply beeps once each time an error is generated.

– If more than 20 errors have occurred when you operate the power supply

over the remote interface, the last error stored in the queue (the most recent error) is replaced with -350, “Queue overflow”. No additional errors are stored until you remove errors from the queue. If no errors have occurred when you read the error queue, the power supply responds with +0, “No error” over the remote interface or “NO ERRORS” from the front panel.

– The error queue is cleared when power has been off or after a *CLS (clear

status) command has been executed. The *RST (reset) command does not clear the error queue.

Front-Panel Operation 3

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3 Front-Panel Operation

– Front-panel operation:

Press (Local) key to return to front-panel operation mode if the power supply is in remote operation mode.

3: ERR -102

If the ERROR annunciator is on, press key to view the errors. Use the knob to scroll through the error numbers. Press to view the text of the error message. Press or key to increase or decrease the scrolling speed of the text on the display. All errors are cleared when you exit the menu or let the display time out for about 30 seconds.

– Remote interface operation:

SYSTem:ERRor? Read and clear one error from the error queue

Errors have the following format (the error string may contain up to 80 characters).

-102, “Syntax error”

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Display control

For security reasons, you may want to turn off the front-panel display. From the remote interface, you can display a 12-character message on the front panel.

– The display can be enabled / disabled from the remote interface only.

– When the display is turned off, outputs are not sent to the display and all

annunciators are disabled except the ERROR annunciator. Front-panel operation is otherwise unaffected by turning off the display.

– The display state is stored in volatile memory; the display is always enabled

when power has been off, after a remote interface reset, or after returning to local from remote.

– You can display a message on the front panel by sending a command from

the remote interface. The power supply can display up to 12 characters of the message on the front panel; any additional characters are truncated. Commas, periods, and semicolons share a display space with the preceding character, and are not considered individual characters. When a message is displayed, outputs are not sent to the display.

– Sending a message to the display from the remote interface overrides the

display state; this means that you can display a message even if the display is turned off.

– The display state is automatically turned on when you return to the local

(front panel) operation. Press (Local) key to return to the local state from the remote interface.

Front-Panel Operation 3

– Remote interface operation:

DISP {OFF|ON} Disable / enable the display

DISP:TEXT <quoted string> Display the strong enclosed in quotes

DISP:TEXT:CLE Clear the displayed message

The following statement shows how to display a message on the front panel from a Hewlett-Packard controller.

“DISP:TEXT ‘HELLO’”

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Firmware revision query

The power supply has three microprocessors for control of various internal systems. You can query the power supply to determine which revision of firmware is installed for each microprocessor.

– You can query the firmware version from the remote interface only.

– The power supply returns four fields separated by commas and the fourth

field is a revision code which contains three numbers. The first number is the firmware revision number for the main processor; the second is for the input/output processor; and the third is for the front-panel processor.

– Remote interface operation:

*IDN? Returns

Be sure to dimension a strong variable with at least 40 characters

“HEWLETT-PACKARD,E3633A,0,X.X-X.X-X.X” (E3633A)

“HEWLETT-PACKARD,E3633A,0,X.X-X.X-X.X” (E3634A)

SCPI language version

The power supply complies with the rules and regulations of the present version of SCPI (Standard Commands for Programmable Instruments). You can determine the SCPI version with which the power supply is in compliance by sending a command from the remote interface.

You can query the SCPI version from the remote interface only.

– Remote interface operation:

SYST:VERS? Query the SCPI version

Returns a string in the form “YYYY.V” where the “Y’s” represent the year of the version, and the “V” represents a version number for that year (for example,

1996.0).

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Remote Interface Configuration

Before you can operate the power supply over the remote interface, you must configure the power supply for the remote interface. This section gives information on configuring the remote interface. For additional information on programming the power supply over the remote interface, See “Remote Interface Reference” on page 99.

Remote interface selection

The power supply is shipped with both an HPIB (IEEE-488) interface and an RS-232 interface on the rear panel. Only one interface can be enabled at a time. The HPIB interface is selected when the power supply is shipped from the factory.

The remote interface can be selected from the front-panel only.

– The interface selection is stored in non-volatile memory, and does not change

when power has been off or after a remote interface reset.

– If you select the HPIB interface, you must select a unique address for the

power supply. The current address is displayed momentarily on the front panel when you turn on the power supply.

– Your HPIB bus controller has its own address. Be sure to avoid using the bus

controller’s address for any instrument on the interface bus. Hewlett-Packard controllers generally use address “21”.

Front-Panel Operation 3

[1]

– If you enable the RS-232 interface, you must select the baud rate and parity to

be used. “RS-232” is displayed momentarily on the front panel when you turn on the power supply if you have selected this interface.

[1] Refer to “HPIB Interface Configuration” on page 84 for more information on connecting the power

supply to a computer over the HPIB interface.

[2] Refer to “RS-232 Interface Configuration” on page 85 for more information on connecting the

power supply to a computer over the RS-232 interface.

[2]

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HPIB address

Each device on the HPIB (IEEE-488) interface must have a unique address. You can set the power supply’s address to any value between 0 and 30. The current address is displayed momentarily on the front panel when you turn on the power supply. The address is set to “05” when the power supply is shipped from the factory.

The HPIB address can be set from the front-panel only.

– The address is stored in non-volatile memory, and does not change when

power has been off or after a remote interface reset.

– Your HPIB bus controller has its own address. Be sure to avoid the bus

controller’s address for any instrument on the interface bus. Hewlett-Packard controllers generally use address “21”.

Baud rate selection (RS-232)

You can select one of six baud rates for RS-232 operation. The rate is set to 9600 baud when the power supply is shipped from the factory.

The baud rate can be set from the front-panel only.

– Select one of the following: 300, 600, 1200, 2400, 4800, 9600 baud. The

factory setting is 9600 baud.

– The baud rate selection is stored in non-volatile memory, and does not change

when power has been off or after a remote interface reset.

Parity selection (RS-232)

You can select the parity for RS-232 operation. The power supply is configured for no parity and 8 data bits when shipped from the factory.

The parity can be set from the front-panel only.

– Select one of the following: None (8 data bits, factory setting), Even (7 data

bits), or Odd (7 data bits). When you set the parity, you are indirectly setting the number of data bits.

– The parity selection is stored in non-volatile memory, and does not change

when power has been off or after a remote interface reset.

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To set the HPIB Address

NOTE

To configure the power supply for the HPIB interface, proceed as follows:

1 Turn on the remote configuration mode.

HPIB / 488

You will see the above message on the front-panel display if the power supply has not been changed from the factory setting. If “RS-232” appears, choose “HPIB / 488” by turning the knob to the right.

2 Move to the HPIB address setting mode.

ADDR 05

The address is set to “05” when the power supply is shipped from the factory. Notice that a different HPIB address may appear if the power supply has been changed from the factory setting.

Front-Panel Operation 3

3 Turn the knob to change the HPIB address.

The displayed address is changed when turning the knob to the right or left.

4 Save the change and turn off the I/O configuration mode.

CHANGE SAVED

The address is stored in non-volatile memory, and does not change when power has been off or after a remote interface reset. The power supply displays a message to show that the change is now in effect. If the HPIB address is not changed, “NO CHANGE” will be displayed for one second.

To exit the I/O configuration mode without any further changes, press the “I/O Config” key until the “NO CHANGE” message is displayed.

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To set the baud rate and parity (RS-232)

To configure the power supply for the RS-232 interface, proceed as follows:

1 Turn on the remote configuration mode.

HPIB / 488

You will see the above message on the display if the power supply has not been changed from the factory setting.

Notice that if you changed the remote interface selection to RS-232 before, “RS-232” message will be displayed.

2 Choose the RS-232 interface.

RS-232

You can choose the RS-232 interface by turning the knob to the left.

3 Move to the RS-232 interface setting mode and select the baud rate.

9600 BAUD

The rate is set to 9600 baud when the power supply is shipped from the factory. Choose from one of the following by turning the knob to the right or left: 300, 600, 1200, 2400, 4800, or 9600 baud.

4 Save the change and choose the parity

NONE 8 BITS

The power supply is configured for 8 data bits with no parity when shipped from the factory. Choose from one of the following by turning the knob to the right or left: None 8 Bits, Odd 7 Bits, or Even 7 Bits. When you set parity, you are indirectly setting the number of the data bits.

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NOTE

5 Save the change and turn off the I/O configuration mode.

CHANGE SAVED

The RS-232 baud rate and parity selections are stored in non-volatile memory, and does not change when power has been off or after a remote interface reset. The power supply displays a message to show that the change is now in effect. If the baud rate and the parity are not changed, “NO CHANGE” will be displayed for one second.

To exit the I/O configuration mode without any further changes, press the “I/O Config” key until the “NO CHANGE” message is displayed.

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NOTE

HPIB Interface Configuration

The HPIB connector on the rear panel connects your power supply to the computer and other HPIB devices. Chapter 1 lists the cables that are available from Hewlett-Packard. An HPIB system can be connected together in any configuration (star, linear, or both) as long as the following rules are observed:

– The total number of devices including the computer is no more than 15.

– The total length of all the cables used is no more than 2 meter times the

number of devices connected together, up to a maximum of 20 meters.

IEEE-488 states that you should exercise caution if your individual cable lengths exceed 4 meters.

Do not stack more than three connector blocks together on any HPIB connector. Make sure that all connectors are fully seated and that the lock screws are firmly finger tightened.

84 Keysight E3633A and E3634A User’s Guide

RS-232 Interface Configuration

You connect the power supply to the RS-232 interface using the 9-pin (DB-9) serial connector on the rear panel. The power supply is configured as a DTE (Data Terminal Equipment) device. For all communications over the RS-232 interface, the power supply uses two handshake lines: DTR (Data Terminal Ready, on pin 4) and DSR (Data Set Ready, on pin 6).

The following sections contain information to help you use the power supply over the RS-232 interface. The programming commands for RS-232 are explained on

page 131.

RS-232 configuration overview

Configure the RS-232 interface using the parameters shown below. Use the front-panel key to select the baud rate, parity, and number of data bits (see

page 80 for more information to configure from the front panel).

– Baud Rate: 300, 600, 1200, 2400, 4800, or 9600 baud (factory setting)

– Parity and Data Bits: None / 8 data bits (factory setting)

Even / 7 data bits, or

Odd / 7 data bits

– Number of Start Bits: 1 bit (fixed) –Number of Stop Bits:2 bits (fixed)

Front-Panel Operation 3

RS-232 Data Frame Format

A character frame consists of all the transmitted bits that make up a single character. The frame is defined as the characters from the start bit to the last stop bit, inclusively. Within the frame, you can select the baud rate, number of data bits, and parity type. The power supply uses the following frame formats for seven and eight data bits.

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Connection to a computer or terminal

To connect the power supply to a computer or terminal, you must have the proper interface cable. Most computers and terminals are DTE (Data Terminal Equipment) devices. Since the power supply is also a DTE device, you must use a DTE-to-DTE interface cable. These cables are also called null-modem, modem-eliminator, or crossover cables.

The interface cable must also have the proper connector on each end and the internal wiring must be correct. Connectors typically have 9 pins (DB-9 connector) or 25 pins (DB-25 connector) with a “male” or “female” pin configuration. A male connector has pins inside the connector shell and a female connector has holes inside the connector shell.

If you cannot find the correct cable for your configuration, you may have to use a

wiring adapter. If you are using a DTE-to-DTE cable, make sure the adapter is a “straight-through” type. Typical adapters include gender changers, null-modem

adapters, and DB-9 to DB-25 adapters.

The cable and adapter diagrams shown below can be used to connect the power supply to most computers or terminals. If your configuration is different than those described, order the HP 34399A Adapter Kit. This kit contains adapters for connection to other computers, terminals, and modems. Instructions and pin diagrams are included with the adapter kit.

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Front-Panel Operation 3

NOTE

DB-9 Serial Connection If your computer or terminal has a 9-pin serial port with a male connector, use the null-modem cable included with the HP 34398A Cable Kit. This cable has a 9-pin female connector on each end. The cable pin diagram is shown below.

DB-25 Serial Connection

If your computer or terminal has a 25-pin serial port with a male connector, use the null-modem cable and 25-pin adapter included with the HP 34398A Cable Kit. The cable and adapter pin diagram are shown below.

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DTR / DSR Handshake Protocol

The power supply is configured as a DTE (Data Terminal Equipment) device and uses the DTR (Data Terminal Ready) and DSR (Data Set Ready) lines of the RS-232 interface to handshake. The power supply uses the DTR line to send a hold-off signal. The DTR line must be TRUE before the power supply will accept data from the interface. When the power supply sets the DTR line FALSE, the data must cease within 10 characters.

To disable the DTR/DSR handshake, do not connect the DTR line and tie the DSR line to logic TRUE. If you disable the DTR/DSR handshake, also select a slower baud rate to ensure that the data is transmitted correctly.

The power supply sets the DTR line FALSE in the following two cases:

1 When the power supply’s input buffer is full (when approximately 100

characters have been received), it sets the DTR line FALSE (pin 4 on the RS-232 connector). When enough characters have been removed to make space in the input buffer, the power supply sets the DTR line TRUE, unless the second case (see next) prevents this.

2 When the power supply wants to “talk” over the interface (which means that it

has processed a query) and has received a <new line> message terminator, it will set the DTR line FALSE. This implies that once a query has been sent to the power supply, the bus controller should read the response before attempting to send more data. It also means that a <new line> must terminate the command string. After the response has been output, the power supply sets the DTR line TRUE again, unless the first case (see above) prevents this.

The power supply monitors the DSR line to determine when the bus controller is ready to accept data over the interface. The power supply monitors the DSR line (pin 6 on the RS-232 connector) before each character is sent. The output is suspended if the DSR line is FALSE. When the DSR line goes TRUE, transmission will resume.

The power supply holds the DTR line FALSE while output is suspended. A form of interface deadlock exists until the bus controller asserts the DSR line TRUE to allow the power supply to complete the transmission. You can break the interface deadlock by sending the <Ctrl-C> character, which clears the operation in progress and discards pending output (this is equivalent to the IEEE-488 device clear action).

For the <Ctrl-C> character to be recognized reliably by the power supply while it holds DTR FALSE, the bus controller must first set DSR FALSE.

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RS-232 troubleshooting

Here are a few things to check if you are having problems communicating over the RS-232 interface. If you need additional help, refer to the documentation that came with your computer.

– Verify that the power supply and your computer are configured for the same

baud rate, parity, and number of data bits. Make sure that your computer is set up for 1 start bit and 2 stop bits (these values are fixed on the power supply).

– Make sure to execute the SYSTem:REMote command to place the power

supply in the remote mode.

– Verify that you have connected the correct interface cable and adapters. Even

if the cable has the proper connectors for your system, the internal wiring may be incorrect. The HP 34398A Cable Kit can be used to connect the power supply to most computers or terminals.

– Verify that you have connected the interface cable to the correct serial port on

your computer (COM1, COM2, etc).

Front-Panel Operation 3

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Calibration Overview

This section gives an overview of the calibration features of the power supply. For more detailed discussion of the calibration procedures, see the Service Guide.

Calibration security

This feature allows you to enter a security code to prevent accidental or unauthorized calibrations of the power supply. When you first receive your power supply, it is secured. Before you can calibrate the power supply, you must unsecure it by entering the correct security code.

–The security code is set to “HP003633”

supply is shipped from the factory. The security code is stored in non-volatile memory, and does not change when power has been off or after a remote interface reset.

– To secure the power supply from the remote interface, the security code may

contain up to 12 alphanumeric characters as shown below. The first character must be a letter, but the remaining characters can be letters or numbers. You do not have to use all 12 characters but the first character must always be a letter.

[1]

or “HP003634”

[2]

when the power

A _ _ _ _ _ _ _ _ _ _ _ (12 characters)

– To secure the power supply from the remote interface so that it can be

unsecured from the front panel, use the eight-character format shown below. The first two characters must be “H P” and the remaining characters must be numbers. Only the last six characters are recognized from the front panel, but all eight characters are required.

To unsecure the power supply from the front panel, omit the “H P” and enter the remaining numbers as shown on the following pages.

H P _ _ _ _ _ _ (8 characters)

[1] For Keysight E3633A Model

[2] For Keysight E3634A Model

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Front-Panel Operation 3

NOTE

If you forget your security code, you can disable the security feature by adding a jumper inside the power supply, and then entering a new code. See the Service Guide for more information.

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To unsecure for calibration

You can unsecure the power supply for calibration either from the front panel or over the remote interface.

The power supply is secured when shipped from the factory, and the security code is set to “HP003633”

– Front-panel operation:

SECURED

If the power supply is secured, you will see the above message for one second by holding (Calibrate) key for 5 seconds when you turn on the power supply. To unsecure the power supply, press (Secure) key after the “CAL

MODE” message is displayed in the calibration mode, enter the security code using the knob and resolution selection keys, and then press the (Secure) key.

000000 CODE

[1]

or “HP003634”

[2]

When you press (Secure) key to save the change, you will see the message below for one second if the security code is correct. The unsecured setting is stored in non-volatile memory, and does not change when power has been off or after a remote interface reset. To exit the calibration mode, turn the

power off and on.

UNSECURED

Notice that if the security is incorrect, the power supply displays an “INVALID” message for a second and returns to the code entering mode for you to enter the correct code.

[1] For Keysight E3633A Model

[2] For Keysight E3634A Model

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– Remote interface operation:

CAL:SEC:STAT {OFF|ON},<code> Secure or unsecure the power supply

To unsecure the power supply, send the above command with the same code used to secure. For example,

“CAL:SEC:STAT OFF, HP003633” (E3633A)

“CAL:SEC:STAT OFF, HP003634” (E3634A)

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To secure against calibration

You can secure the power supply against calibration either from the front panel or over the remote interface. The power supply is secured when shipped from the

factory, and the security code is set to “HP003633”

Be sure to read the security code rules on page 90 before attempting to secure the power supply.

– Front-panel operation:

UNSECURED

If the power supply is unsecured, you will see the above message for one second by holding (Calibrate) key for 5 seconds when you turn on the power supply. To secure the power supply, press (Secure) key after the

“CAL MODE” message is displayed in the calibration mode, enter the security code using the control knob and resolution selection keys, and then press (Secure) key.

Notice that you should omit the “HP” and enter the remaining numbers as shown below.

[1]

or “HP003634”

[2]

000000 CODE

When you press (Secure) key to save the change, you will see the message below. The secured setting is stored in non-volatile memory, and does not change when power has been off or after a remote interface reset. To exit the calibration mode, turn the power off and on.

SECURED

[1] For Keysight E3633A Model

[2] For Keysight E3634A Model

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Front-Panel Operation 3

– Remote interface operation:

CAL:SEC:STAT {OFF|ON},<code> Secure or unsecure the power supply

To secure the power supply, send the above command with the same code as used to unsecure. For example,

“CAL:SEC:STAT ON, HP003633” (E3633A)

“CAL:SEC:STAT ON, HP003634” (E3634A)

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To change the security code

To change the security code, you must first unsecure the power supply, and then enter a new code.

Be sure to read the security code rules on page 90 before attempting to secure the power supply.

– Front-panel operation:

To change the security code, first make sure that the power supply is unsecured. Press (Secure) key after the “CAL MODE” message is displayed in the calibration mode, enter the new security code using control knob and

resolution selection keys, then press (Secure) key.

Changing the code from the front panel also changes the code required from the remote interface.

– Remote interface operation:

CAL:SEC:CODE <new code> Change the security code

To change the security code, first unsecure the power supply using the old security code. Then, enter the new code. For example,

[a]

“CAL:SEC:STAT OFF, HP003633

“CAL:SEC:CODE ZZ001443” Enter new code

“CAL:SEC:STAT ON, ZZ001443” Secure with new code

[a] For Keysight E3633A Model

[b] For Keysight E3634A Model

or HP003634

[b]

Unsecure with old code

”

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Calibration count

You can determine the number of times that your power supply has been calibrated. Your power supply was calibrated before it left the factory. When you receive your power supply, read the count to determine its initial value.

The calibration count feature can be performed from the remote interface only.

– The calibration count is stored in non-volatile memory, and does not

change when power has been off or after a remote interface reset.

– The calibration count increments up to a maximum of 32,767 after which it

wraps around to 0. Since the value increments by one for each calibration point, a complete calibration will increase the value by 5 counts.

– Remote interface operation:

CAL:COUN? Query the number of times of calibration

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3 Front-Panel Operation

Calibration Message

You can use the calibration message feature to record calibration information about your power supply. For example, you can store such information as the last calibration date, the next calibration due date, the power supply’s serial number, or even the name and phone number of the person to contact for a new calibration.

You can record and read information in the calibration message from the remote interface only.

– The power supply should be unsecured before sending a calibration

message.

– The calibration message may contain up to 40 characters.

– The calibration message is stored in non-volatile memory, and does not

change when power has been off or after a remote interface reset.

– Remote interface operation:

CAL:STR <quoted string> Store the cal message

The following command strong shows how to store a calibration message.

“CAL:STR ‘CAL 12-05-98’”

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Keysight E3633A and E3634A DC Power Supplies User’s Guide

4 Remote Interface

Reference

SCPI Command Summary 100 Simplified Programming Overview 107 Using the APPLy Command 111 Output Setting and Operation Commands 113 Triggering Commands 120 System-Related Commands 123 Calibration Commands 128 RS-232 Interface Commands 131 The SCPI Status Registers 132 Status Reporting Commands 140 An Introduction to the SCPI Language 143 Halting an Output in Progress 149 SCPI Conformance Information 150 IEEE-488 Conformance Information 154

If you are a first-time user of the SCPI language, you may want to refer to these sections to become familiar with the language before attempting to program the power supply.

4 Remote Interface Reference

SCPI Command Summary

This section summarizes the SCPI (Standard Commands for Programmable Instruments) commands available to program the power supply over the remote interface. Refer to the later sections in this chapter for more complete details on each command.

Throughout this manual, the following conventions are used for SCPI command syntax.

– Square brackets ([ ]) indicate optional keywords or parameters.

– Braces ({ }) enclose parameters within a command string.

– Triangle brackets (< >) indicate that you must substitute a value or a code for

the enclosed parameter.

– A vertical bar ( | ) separates one of two or more alternative parameters.

First-time SCPI users, see page 143.

100 Keysight E3633A and E3634A User’s Guide

Keysight E3633A, E3634A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Certification

Warranty Information

Limitation of Warranty

Exclusive Remedies

Assistance

Safety Symbols

Safety Considerations

Regulatory Markings

Waste Electrical and Electronic Equipment (WEEE) Directive

Product category:

Sales and Technical Support

Table of Contents

List of Figures

List of Tables

1 General Information

Safety Considerations

Safety and EMC requirements

Options and Accessories

Options

Accessories

Description

Installation

Initial inspection

Cooling and location

Product at a Glance

The front panel at a glance

Front-panel voltage and current limit settings

Display annunciators

The rear panel at a glance

Input Power Requirements

Power-line cord

Power-line voltage selection

2 Initial Operation

Preliminary Checkout

Power-on Checkout

Output Checkout

Voltage output checkout

Current output checkout

3 Front-Panel Operation

Front-Panel Operation Overview

Constant Voltage Operation

Constant Current Operation

Storing and Recalling Operating States

Programming Overvoltage Protection

Programming Overcurrent Protection

Remote Voltage Sensing at the Front and Rear Terminals

CV regulation

Output rating

Output noise

Stability

Remote voltage sensing connections

Remote voltage sensing at the rear panel

Disabling the Output

Disabling the Output Using an External Relay

Knob Locking

System-Related Operations

Self-test

Error conditions

Display control

Firmware revision query

SCPI language version

Remote Interface Configuration

Remote interface selection

HPIB address

Baud rate selection (RS-232)

Parity selection (RS-232)

To set the HPIB Address

To set the baud rate and parity (RS-232)

HPIB Interface Configuration

RS-232 Interface Configuration

RS-232 configuration overview

RS-232 Data Frame Format

Connection to a computer or terminal

DTR / DSR Handshake Protocol

RS-232 troubleshooting

Calibration Overview