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Keysight E3620A
Dual Output Power Supply

Operating and
Service Manual
1-1
CERTIFICATION
Keysight Technologies certifies that this product met its published specifications at time of shipment from the factory. Keysight
Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Stan-
dards 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
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 hard-
ware 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 defec-
tive. 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 des-
ignated 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 Key-
sight 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.

LIMITATION OF WARRANTY
The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer, Cus-
tomer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifica-
tions for the product, or improper site preparation and maintenance. TO THE EXTENT ALLOWED BY LOCAL LAW, NO
OTHER WARRANTY IS EXPRESSED OR IMPLIED. AND KEYSIGHT SPECIFICALLY DISCLAIMS THE IMPLIED WAR-
RANTIES 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
TO THE EXTENT ALLOWED BY LOCAL LAW, THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER'S SOLE AND
EXCLUSIVE REMEDIES. KEYSIGHT 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 Technolo-
gies Sales and Service office for further information on Keysight's full line of Support Programs.
SAFETY SUMMARY
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 of design,
manufacture, and intended use of the instrument. Keysight Technologies assumes no liability for the customer's failure to comply
with these requirements.
Direct current (DC)
BEFORE APPLYING POWER.
Verify that the product is set to match the available line volt- Alternating current (AC)
age and that the correct fuse is installed.
Protective conductor terminal

GROUND THE INSTRUMENT.
This product is a Safety Class I instrument (provided with a Out position of a bi-stable push control
protective earth terminal). To minimize shock hazard, the
instrument chassis and cabinet must be connected to an In position of a bi-stable push control
electrical ground. The instrument must be connected to the
AC power supply mains through a three-conductor power Earth (ground) terminal
cable, with the third wire firmly connected to an electrical
ground(safety ground) at the power outlet. Any interruption of Positive binding post
the protective(grounding) conductor or disconnection of the
Negative binding post
protective earth terminal will cause a potential shock hazard
that could result in personal injury. If the instrument is to be
Frame or chasis terminal
energized via an external autotransformer for voltage reduc-
tion, be certain that the autotransformer common terminal is The WARNING sign denotes a hazard. It
connected to the neutral(earthed pole) of the AC power lines WARNING
calls attention to a procedure, practice,
(supply mains). or the like, which, if not correctly per-
formed or adhered to, could result inper-
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE. sonal injury. Do not proceed beyond a
Do not operate the instrument in the presence of flammable WARNING sign until the indicated con-
gases or fumes. ditions are fully understood and met.

The CAUTION sign denotes a hazard. It
KEEP AWAY FROM LIVE CIRCUITS. CAUTION
calls attention to an operating procedure,
Operating personnel must not remove instrument covers. or the like, which, if not correctly per-
Component replacement and internal adjustments must be formed or adhered to, could result in
made by qualified service personnel. Do not replace compo- damage to or destruction of part or all of
nents with power cable connected. Under certain conditions, the product. Do not proceed beyond
dangerous voltages may exist even with the power cable CAUTION sign until the indicated condi-
removed. To avoid injuries, always disconnect power, dis- tions are fully understood and met.
charge circuits and remove external voltage sources before
touching components. The NOTE sign denotes important infor-
NOTE
mation. It calls attention to a procedure,
practice, condition or the like, which is
DO NOT SERVICE OR ADJUST ALONE.
essential to highlight.
Do not attempt internal service or adjustment unless another
person, capable of rendering first aid and resuscitation, is
DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT.
present.
Because of the danger of introducing additional hazards, do
SAFETY SYMBOLS not install substitute parts or perform any unauthorized modi-
fication to the instrument. Return the instrument to a Keysight
Caution, risk of danger (refer to this Technologies Sales and Service Office for service and repair
manual for specific Warning or Caution to ensure that safety features are maintained.
information)

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

1-3
REGULATORY MARKINGS

The CE marking is a legal compliance The CSA mark is a registered
marking of the European Community. trademark of the Canadian Standards
This CE marking shows that the Association.
product complies with all the relevant
European Legal Directives.
This symbol indicates the time period
The C-tick mark is a registered trade- during which no hazardous or toxic sub-
mark of the Spectrum Management stance elements are expected to leak
Agency of Australia. This signifies or deteriorate during normal use. Forty
compliance with the Australia EMC years is the expected useful life of the
Framework regulations under the terms product.
of the Radio Communication Act of
1992. This symbol is a South Korean Class A
EMC Declaration. This is a Class A
ICES/NMB-001 indicates that this ISM instrument suitable for professional use
device complies with the Canadian and in electromagnetic environment
ICES-001. Cet appareil ISM est outside of the home.
confomre 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.

1-4
DECLARATION OF CONFORMITY

The Declaration of Conformity (DoC) for this instrument is available on the Keysight Web site. You can search for the DoC by
its product model or description at the web address below.

http://www.keysight.com/go/conformity

If you are unable to search for the respective DoC, please contact your local Keysight representative.

1-5
TABLE OF CONTENTS

SAFETY SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
REGULATORY MARKINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
DECLARATION OF CONFORMITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
SAFETY AND EMC REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
INSTRUMENT AND MANUAL IDENTIFICATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
ACCESSORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
LINE FUSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
INITIAL INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Mechanical Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Electrical Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
INSTALLATION DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Location and Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Outline Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
INPUT POWER REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Power Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Line Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Voltage and Current Metering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Voltage Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
TURN-ON CHECKOUT PROCEDURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Overload Protection Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Operation Beyond Rated Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Connecting Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Series Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Parallel Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
LOAD CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
PULSE LOADING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
REVERSE CURRENT LOADING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
OUTPUT CAPACITANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
REVERSE VOLTAGE PROTECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
SERVICE INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
PERFORMANCE TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

1-6
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
ADJUSTMENT AND CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
COMPONENT LOCATOR DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
MAIN BOARD -- TOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
MAIN BOARD -- BOTTOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
DISPLAY CONTROLLER -- TOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9
DISPLAY CONTROLLER -- BOTTOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-10
7-SEGMENT -- TOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-11
7-SEGMENT -- BOTTOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12

1-7
GENERAL INFORMATION INSTRUMENT AND MANUAL IDENTIFICATION
A serial number identifies your power supply. The serial num-
DESCRIPTION ber encodes the country of manufacture, the week of the lat-
The Model E3620A Dual Output Power Supply is a compact, est significant design change, and a unique sequential
constant voltage/current limiting supply that delivers two iso-
number. The letter "KR" or "MY" designates Korea or
lated 0 to 25 V outputs rated at 1 A. It is an ideal power supply
Malaysia as the country of manufacture respectively. For
for design and breadboard work where single or dual voltages
are required. Each output voltage is continuously variable Korea, the first one digit indicates the year (4=1994, 5=1995,
throughout its range and separate current limit circuits protect and so forth), and the second two digits indicate the week.
each output against overload or short circuit damage. For Malaysia, the first two digits indicate Keysight year and
the second two digits indicate the work-week. The remaining
Connections to the outputs are made to binding post type ter- digits of the serial number are a unique, five-digit number
minals on the front panel. The outputs can be used individu- (Korea) or four-digit number (Malaysia) assigned sequentially.
ally or in combination to satisfy any number of output
demands. The positive or negative terminal of each output If a yellow Change Sheet is supplied with this manual, its pur-
can be grounded or each output can be left floating. A chassis pose is to explain any differences between your instrument
ground terminal is located on the front panel of the supply. and the instrument described in this manual. The Change
Sheet may also contain information for correcting errors in the
The front panel also contains a line switch, output voltage manual.
controls, an autoranging digital voltmeter and a single-range
digital ammeter, and two meter select pushbutton switches. OPTIONS
The meter pushbuttons select both voltage and current Options 0EM, 0E3, and 0E9 determine which line voltage is
monitoring for the output V1 and V2. The supply is furnished selected at the factory. The standard unit is configured for 115
with a detachable, 3-wire grounding type line cord. The AC VAC