Keysight Technologies E3620A Service manual

Keysight E3620A
Dual Output Power Supply
Operating and
Service Manual

2 Keysight E3620A Operating and Service Manual
Notices
Copyright Notice
© Keysight Technologies 2002 - 2018
No part of this manual may be repro-
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 Technol-
ogies as governed by United States and
international copyright laws.
Manual Part Number
E3620-90001
Edition
Edition 12, December 1, 2018
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 fur-
nished 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 prod-
ucts 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 Dec-
laration of Conformity.
U.S. Government Rights
The Software is “commercial computer
software,” as defined by Federal Acqui-
sition Regulation (“FAR”) 2.101. Pursu-
ant to FAR 12.212 and 27.405-3 and
Department of Defense FAR Supple-
ment (“DFARS”) 227.7202, the U.S.
government acquires commercial com-
puter 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 stan-
dard 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 Soft-
ware. The EULA and the license set
forth therein, does not require or per-
mit, among other things, that Keysight:
(1) Furnish technical information
related to commercial computer soft-
ware or commercial computer software
documentation that is not customarily
provided to the public; or (2) Relinquish
to, or otherwise provide, the govern-
ment rights in excess of these rights
customarily provided to the public to
use, modify, reproduce, release, per-
form, display, or disclose commercial
computer software or commercial com-
puter 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 pursu-
ant to the FAR and the DFARS and are
set forth specifically in writing else-
where 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 DIS-
CLAIMS ALL WARRANTIES, EITHER
EXPRESS OR IMPLIED, WITH REGARD
TO THIS MANUAL AND ANY INFORMA-
TION CONTAINED HEREIN, INCLUD-
ING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MER-
CHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. KEYSIGHT
SHALL NOT BE LIABLE FOR ERRORS
OR FOR INCIDENTAL OR CONSE-
QUENTIAL DAMAGES IN CONNECTION
WITH THE FURNISHING, USE, OR
PERFORMANCE OF THIS DOCUMENT
OR OF ANY INFORMATION CON-
TAINED HEREIN. SHOULD KEYSIGHT
AND THE USER HAVE A SEPARATE
WRITTEN AGREEMENT WITH WAR-
RANTY TERMS COVERING THE MATE-
RIAL IN THIS DOCUMENT THAT
CONFLICT WITH THESE TERMS, THE
WARRANTY TERMS IN THE SEPARATE
AGREEMENT SHALL CONTROL.
Safety Information
CAUTION
A CAUTION notice denotes a hazard. It
calls attention to an operating proce-
dure, 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 pro-
ceed beyond a CAUTION notice until
the indicated conditions are fully
understood and met.
WARNING
A WARNING notice denotes a hazard. It
calls attention to an operating proce-
dure, 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.

Keysight E3620A Operating and Service Manual 3
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 instrument product is warranted against defects in
material and workmanship for a period of one year from date of shipment. During
the warranty period, Keysight Technologies will at its option, either repair or
replace products which prove to be defective. For warranty service or repair, this
product must be returned to a service facility designated by Keysight
Technologies. Buyer shall prepay shipping charges to Keysight Technologies and
Keysight Technologies shall pay shipping charges, duties, and taxes for products
returned to Keysight Technologies from another country. Keysight Technologies
warrants that its software and firmware designated by Keysight Technologies for
use with an instrument will execute its programming instructions when properly
installed on that instrument. Keysight Technologies does not warrant that the
operation of the instrument, or firmware will be uninterrupted or error free.
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.

4 Keysight E3620A Operating and Service Manual
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.
Safety Considerations
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.
CAUTION
– This product is designed for use in Installation Category II and Pollution
Degree 2.
– This instrument has been designed and tested in accordance with IEC
Publication 348, Safety Requirements for Electronic Measuring
Apparatus, and has been supplied in a safe condition. The instruction
documentation contains information and warnings which must be
followed by the user to ensure safe operation and to maintain the
instrument in a safe condition.
– “CSA” The CSA mark is a registered trademark of the Canadian Standards
Association.
– Notice for Germany: Noise Declaration LpA < 70 dB am Arbeitsplatz
(operator position) normaler Betrieb (normal position) nach DIN 45635 T.
19 (per ISO 7779).

Keysight E3620A Operating and Service Manual 5
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)

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Keysight E3620A Operating and Service Manual 7
Table of Contents
Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Limitation of Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Exclusive Remedies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Waste Electrical and Electronic Equipment (WEEE) Directive . . . . . . . .5
Product category: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Safety And EMC Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Instrument And Manual Identification . . . . . . . . . . . . . . . . . . . . . . . .14
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Accessory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Line Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Installation Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Input Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Turn-on Checkout Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Load Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Pulse Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

8 Keysight E3620A Operating and Service Manual
Reverse Current Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Output Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Reverse Voltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
General Measurement Techniques . . . . . . . . . . . . . . . . . . . . . . . . 31
Load Regulation (Load Effect) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Line Regulation (Source Effect) . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Load Transient Response Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Stability (Drift) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
ADJUSTMENT AND CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Component Locator Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Main Board — Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Main Board — Bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Display Controller — Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Display Controller — Bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7-Segment — Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7-Segment — Bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Keysight E3620A Operating and Service Manual 9
List of Figures
Figure 1-1 Outline Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Figure 1-2 Front-Panel Controls and Indicators . . . . . . . . . . . . . .20
Figure 1-3 Reverse Current Loading Solution . . . . . . . . . . . . . . .26
Figure 1-4 Line Voltage Selector (set for 115 VAC) . . . . . . . . . . .30
Figure 1-5 Front Panel Terminal Connections . . . . . . . . . . . . . . .32
Figure 1-6 Current Sampling Resistor Connections . . . . . . . . . . .33
Figure 1-7 Output Current, Test Set Up . . . . . . . . . . . . . . . . . . . .34
Figure 1-8 Basic Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Figure 1-9 Ripple and Noise rms Measurement Test Setup . . . . .38
Figure 1-10 Load Transient Response Time Waveform . . . . . . . . .41

10 Keysight E3620A Operating and Service Manual

Keysight E3620A Operating and Service Manual 11
List of Tables
Table 1-1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Table 1-2 Test Equipment Required . . . . . . . . . . . . . . . . . . . . . . .29

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Keysight E3620A Operating and Service Manual 13
General Information
Description
The Model E3620A Dual Output Power Supply is a compact, constant voltage/
current limiting supply that delivers two isolated 0 to 25 V outputs rated at 1 A. It
is an ideal power supply for design and breadboard work where single or dual
voltages are required. Each output voltage is continuously variable throughout its
range and separate current limit circuits protect each output against overload or
short circuit damage.
Connections to the outputs are made to binding post type terminals on the front
panel. The outputs can be used individually or in combination to satisfy any
number of output demands. The positive or negative terminal of each output can
be grounded or each output can be left floating. A chassis ground terminal is
located on the front panel of the supply.
The front panel also contains a line switch, output voltage controls, an
autoranging digital voltmeter and a single-range digital ammeter, and two meter
select pushbutton switches. The meter pushbuttons select both voltage and
current monitoring for the output V1 and V2. The supply is furnished with a
detachable, 3-wire grounding type line cord. The AC line fuse is an extractor type
fuseholder on the rear heat sink.
Safety Considerations
This product is a Safety Class I instrument, which means that it is provided with a
protective earth ground terminal. This terminal must be connected to an AC
source that has a 3-wire ground receptacle. Review the instrument rear panel and
this manual for safety markings and instructions before operating the instrument.
Refer to the Safety Summary page at the beginning of this manual for a summary
of general safety information. Specific safety information is located at the
appropriate places in this manual.

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14 Keysight E3620A Operating and Service Manual
Safety And EMC Requirements
This power supply is designed to comply with the following safety and
EMC (Electromagnetic Compatibility) requirements
Safety
– IEC 61010-1:2010 / EN 61010-1:2010
– CAN/CSA-C22.2 No. 61010.1-12
EMC
– IEC 61326-1:2005/EN61326-1:2006
– CISPR11:2003/EN55011:2007
– Canada: ICES/NMB-001:Issue 4, June 2006
– Australia/New Zealand: AS/NZS CISPR 11:2004
Instrument And Manual Identification
A serial number identifies your power supply. The serial number encodes the
country of manufacture, the week of the latest significant design change, and a
unique sequential number. The letter “KR” or “MY” designates Korea or Malaysia
as the country of manufacture respectively. For Korea, the first one digit indicates
the year (4=1994, 5=1995, and so forth), and the second two digits indicate the
week. For Malaysia, the first two digits indicate Keysight year and the second two
digits indicate the work-week. The remaining digits of the serial number are a
unique, five-digit number (Korea) or four-digit number (Malaysia) assigned
sequentially.
If a yellow Change Sheet is supplied with this manual, its purpose is to explain any
differences between your instrument and the instrument described in this manual.
The Change Sheet may also contain information for correcting errors in the
manual.

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Keysight E3620A Operating and Service Manual 15
Options
Options 0EM, 0E3, and 0E9 determine which line voltage is selected at the
factory. The standard unit is configured for 115 VAC ± 10%, 47-63 Hz input.
Accessory
The accessory listed below may be ordered from your local Keysight Technologies
Sales Office either with the power supply or separately. (Refer to the list at the
rear of the manual for address.)
.
The rack mount kit is needed for rack mounting of the E3620A power supply
Specifications
Instrument specifications are listed in Table 1. These specifications are
performance standards or limits against which the instrument is tested.
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
Keysight Part No. Description
5063 - 9240 Rack Kit for mounting one or two 3 1/2" high supplies in a standard 19" rack

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16 Keysight E3620A Operating and Service Manual
Line Fuse
The line fuse is located by the AC line receptacle. Check the rating of the line fuse
and replace it with the correct fuse if necessary as indicated below. These are
slow-blow fuses.
Line Voltage Fuse Keysight Part No.
100/115 VAC 2 A 2110-0702
230 VAC 1 A 2110-0457
Table 1-1 Specifications
Item Specifications
WARRANTED SPECIFICATIONS
DC Output
Voltage span over which output may be varied using front panel controls.
– Output V1: 0 to 25 V at 1 A
– Output V2: 0 to 25 V at 1 A
Load Regulation Less than 0.01% plus 2 mV for a full load to no load change in output current.
Line Regulation Less than 0.01% plus 2 mV for any line voltage change within rating.
Ripple And Noise – Normal Mode Voltage: Less than 0.35 mVrms/1.5 mV p-p (20 Hz-20 MHz).
– Common Mode Current (CMI): Less than 1 mArms for all outputs (20 Hz-20 kHz).
Operating
Temperature Range
0 to 40 °C for full rated output. At higher temperatures,
output current is derated linearly to 50% at 55 °C maximum temperature.
Operating Altitude Up to 2000 m
Storage Temperature
Range –20 °C to 70 °C
Humidity Up to 80% RH
Load Transient
Response Time
Less than 50 msec for output recovery to within 15 mV of nominal output voltage following a load
change from full load to half load, or vice versa.
Meter Accuracy : ± (0.5% of output + 2 counts)

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Keysight E3620A Operating and Service Manual 17
Meter Resolution – Voltage:10 mV (0 to 20 V),100 mV (above 20 V)
– Current:1 mA at 25 °C±5 °C
TYPICAL (SUPPLEMENTAL) SPECIFCATIONS
Temperature
Coefficient
Less than 0.02% plus 1 mV voltage change per °C over the operating range from 0 to 40 °C after 30
minutes warm-up.
Stability (Output
Drift)
Less than 0.1% plus 5 mV (DC to 20 Hz) during 8 hours at constant line, load and ambient after an initial
warm-up time of 30 minutes.
Output Voltage
Overshoot
During turn-on or turn-off of AC power, output plus overshoot will not exceed 1 V if the output control is
set for less than 1 V. If the control is set for 1 V or higher, there is no overshoot.
GENERAL SPECIFICATIONS
AC INPUT
– 0EM:115 VAC ± 10%, 47-63 Hz, 200 VA, 130 W
– 0E9:100 VAC ± 10%, 47-63 Hz, 200 VA, 130 W
– 0E3:230 VAC ± 10%, 47-63 Hz, 200 VA, 130 W
DIMENSIONS 212.3 mmW x 88.1 mmH x 345.4 mmD
(8.4 inW x 3.5 inH x 13.6 inD)
WEIGHT 5.0 kg (11.0 lbs) net, 6.25 kg (13.8 lbs) shipping
This instrument is Intended for Indoor use.
Table 1-1 Specifications
Item Specifications

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18 Keysight E3620A Operating and Service Manual
Installation
Initial Inspection
Before shipment, this instrument was inspected and found to be free of
mechanical and electrical defects. As soon as the instrument is unpacked, inspect
for any damage that may have occurred in transit. Save all packing materials until
the inspection is completed. If damage is found, a claim should be filed with the
carrier. The Keysight Technologies Sales and Service office should be notified as
soon as possible.
Mechanical Check
This check should confirm that there are no broken knobs or connectors, that the
cabinet and panel surfaces are free of dents and scratches, and that the meter is
not scratched or cracked.
Electrical Check
This instrument should be checked against electrical specifications. Perform the
TURN-ON CHECKOUT PROCEDURE in the following paragraph to confirm that
the supply is operational. Alternately, check the supply more fully using the
PERFORMANCE TEST in the service information section.
Installation Data
The instrument is shipped ready for bench operation. Before applying power to
the supply, please read the INPUT POWER REQUIREMENTS paragraph.
Location and Cooling
This instrument is air cooled. Sufficient space should be allowed so that a free
flow of cooling air can reach the sides and rear of the instrument when it is in
operation. It should be used in an area where the ambient temperature does not
exceed 40 °C.
Outline Diagram
Figure 1-1 illustrates the outline shape and dimensions of the supply.

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Keysight E3620A Operating and Service Manual 19
Rack Mounting
This supply may be rack mounted in a standard 19-inch rack panel either by itself
or alongside a similar unit. Please see “Accessory” on page 15 for available rack
mounting accessory. The rack-mounting kit includes complete installation
instructions.
Input Power Requirements
Depending on the line voltage option ordered, the supply is ready to be operated
from one of the power sources listed in Table 1-1. A label on the rear heat sink
shows the nominal input voltage set for the supply at the factory.
Power Cable
To protect operating personnel, the supply should be grounded. This supply is
equipped with a three conductor power cable. The third conductor is the ground
conductor and when the cable is plugged into an appropriate receptacle, the
supply is grounded. The power supply is equipped at the factory with a power cord
plug appropriate for the user's location. Notify the nearest Keysight Sales and
Service Office if the appropriate power cord is not included with the supply.
Figure 1-1 Outline Diagram

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20 Keysight E3620A Operating and Service Manual
Operating Instructions
Introduction
This section describes the operating controls and indicators, turn-on checkout
procedures, and other operating considerations for the Model E3620A Dual
Output Power Supply.
Figure 1-2 Front-Panel Controls and Indicators
CAUTION
Before applying power to the supply, check the label on the heat sink to
make certain that the supply's line voltage option agrees with the line
voltage to be used. If the option does not correspond to your line voltage,
refer to paragraph “LINE VOLTAGE OPTION CONVERSION” in the service
section before applying power.
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