Keysight E3620A
Dual Output Power Supply
Operating and
Service Manual
Notices
CAUTION
WARNING
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 Technologies 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 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.
2 Keysight E3620A Operating and Service Manual
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.
Keysight E3620A Operating and Service Manual 3
Exclusive Remedies
CAUTION
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.
– 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).
4 Keysight E3620A Operating and Service Manual
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 E3620A Operating and Service Manual 5
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6 Keysight E3620A Operating and Service Manual
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
Keysight E3620A Operating and Service Manual 7
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
8 Keysight E3620A Operating and Service Manual
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
Keysight E3620A Operating and Service Manual 9
10 Keysight E3620A Operating and Service Manual
List of Tables
Table 1-1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Table 1-2 Test Equipment Required . . . . . . . . . . . . . . . . . . . . . . .29
Keysight E3620A Operating and Service Manual 11
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12 Keysight E3620A Operating and Service Manual
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.
1
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.
Keysight E3620A Operating and Service Manual 13
1
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.
14 Keysight E3620A Operating and Service Manual
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.
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
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.)
.
Keysight Part No. Description
5063 - 9240 Rack Kit for mounting one or two 3 1/2" high supplies in a standard 19" rack
1
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.
Keysight E3620A Operating and Service Manual 15
1
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
Tab le 1-1 Specifications
Item Specifications
WARRANTED SPECIFICATIONS
Voltage span over which output may be varied using front panel controls.
DC Output
Load Regulation Less than 0.01% plus 2 mV for a full load to no load change in output current.
– Output V1: 0 to 25 V at 1 A
– Output V2: 0 to 25 V at 1 A
Line Regulation Less than 0.01% plus 2 mV for any line voltage change within rating.
Ripple And Noise
Operating
Temperature Range
Operating Altitude Up to 2000 m
Storage Temperature
Range
Humidity Up to 80% RH
Load Transient
Response Time
Meter Accuracy : ± (0.5% of output + 2 counts)
– 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).
0 to 40 °C for full rated output. At higher temperatures,
output current is derated linearly to 50% at 55 °C maximum temperature.
–20 °C to 70 °C
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.
16 Keysight E3620A Operating and Service Manual
Table 1-1 Specifications
Item Specifications
Meter Resolution
TYPICAL (SUPPLEMENTAL) SPECIFCATIONS
Temperature
Coefficient
Stability (Output
Drift)
– Voltage:10 mV (0 to 20 V),100 mV (above 20 V)
– Current:1 mA at 25 °C±5 °C
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.
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.
1
Output Voltage
Overshoot
GENERAL SPECIFICATIONS
AC INPUT
DIMENSIONS
WEIGHT
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.
212.3 mmW x 88.1 mmH x 345.4 mmD
(8.4 inW x 3.5 inH x 13.6 inD)
5.0 kg (11.0 lbs) net, 6.25 kg (13.8 lbs) shipping
This instrument is Intended for Indoor use.
– 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
Keysight E3620A Operating and Service Manual 17
1
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.
18 Keysight E3620A Operating and Service Manual
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.
1
Figure 1-1 Outline Diagram
Keysight E3620A Operating and Service Manual 19
1
CAUTION
4 5
109876321
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.
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.
Figure 1-2 Front-Panel Controls and Indicators
20 Keysight E3620A Operating and Service Manual
Controls
123
NOTE
4
5
124
1
Line Switch
The LINE pushbutton switch ( , Figure 1-2) is pushed-in to turn the supply ON
and released (out position) to turn the supply OFF.
Voltage and Current Metering
Two meter select pushbutton switches ( and ) permit the output voltage
and current of either output (V1 or V2) to be monitored on the VOLTS/AMPS
meter. The V1 and V2 output select pushbuttons connect the desired output to
the metering circuit when the applicable button is pushed in.
Be careful that both METER pushbuttons are not released (out-position) or
pushed in simultaneously.
Voltage Controls
The V1 and V2 voltage controls ( and )set the voltage level of the
corresponding output. The voltage controls are 10 turn potentiometers.
Turn-on Checkout Procedure
The following steps describe the use of the Model E3620A front panel controls
illustrated in Figure 1-2 and serve as a brief check that the supply is operational.
Follow this checkout procedure or the more detailed performance test of service
information section when the instrument is received and before it is connected to
any load equipment. Proceed to the more detailed performance test beginning in
service information section if any difficulties are encountered.
1 Connect line cord to power source and push LINE switch in.
2 Push the V1 meter select pushbutton switch to in-position to monitor
supply's V1 output voltage. With no load connected, vary the V1 voltage
control over its range and check that the voltmeter responds to the
control setting and the ammeter indicates zero.
Keysight E3620A Operating and Service Manual 21
1
467
NOTE
3 Turn the V1 voltage control fully clockwise and short the +V1 output
terminal to -V1 terminal with an insulated test lead. The ammeter
should indicate a short-circuit output current of minimum 1.0 A + 5% at 25 °C.
Remove the short from the output terminals.
4 Push the V2 meter select pushbutton switch to in-position and repeat steps (b)
and (c) for V2 output.
If this brief checkout procedure or later use of the supply reveals a possible
malfunction, see the service information section for detailed test, troubleshooting,
and adjustment procedures.
Operation
The dual outputs of the E3620A can be used individually, in series, or in parallel.
Each output can be floated (up to 240 volts off ground) or, the + or - terminal of
either output can be grounded to the chassis ground terminal which is located on
the supply's front panel.
Overload Protection Circuits
The outputs are individually protected against overload or short circuit damage by
separate current limiting circuits. The circuits are factory adjusted to limit the
output current to minimum 1 A + 5%. The current limits are set by adjusting R63 in
the V1 supply and R34 in the V2 supply (see the schematic diagram). No
deterioration of supply performance occurs if the output current remains below
the current limit setting.
During the actual operation of the V1 and V2 outputs, if a load change causes
the current limit to be exceeded, the OVERLOAD LED is lighted. If overload
conditions occur, the V1 and V2 supplies will protect the load by limiting the
current to minimum 1 A + 5%. The V1 and V2 supplies are self restoring; that is,
when the overload is removed or corrected, the output voltage is automatically
restored to the previously set value.
22 Keysight E3620A Operating and Service Manual
Operation Beyond Rated Output
The supply may be able to provide voltages and currents greater than its rated
maximum outputs if the line voltage is at or above its nominal value. Operation
can be extended up to 5% over the rated output without damage to the supply,
but performance cannot be guaranteed to meet specifications above the rated
output of 0 to 25 V at 1 A.
Connecting Load
Connect each load to the power supply output terminals using separate pairs of
connecting wires. This will minimize mutual coupling effects between loads and
takes full advantage of the low output impedance of the supply. Load wires must
be of adequately heavy gauge to maintain satisfactory regulation at the load.
Make each pair of connecting wires as short as possible and twist or shield them
to reduce noise pick-up. If a shield is used, connect one end of the shield to the
power supply ground terminal and leave the other end unconnected.
If load considerations require locating output power distribution terminals at a
distance from the power supply, then the power supply output terminals should
be connected to the remote distribution terminals by a pair of twisted or shielded
wires and each load should be connected to the remote distribution terminals
separately.
1
Series Operation
The two outputs (V1 and V2) can be connected in series to obtain a voltage (up to
50 V) higher than that available from a single output. Each output control (V1 and
V2) must be adjusted in order to obtain the total output voltage. Diodes
connected internally across each output protect the supply's output filter
capacitors against reverse voltages. This could occur if the supplies are connected
in series and the output is shorted.
Keysight E3620A Operating and Service Manual 23
1
Parallel Operation
The V1 and V2 supplies can be connected in parallel to obtain a total output
current greater than that available from one supply. The total output current is the
sum of the output currents of the individual supplies. The output voltage controls
of one power supply should be set to the desired output voltage, and the other
supply set for a slightly larger output voltage. The supply set to the lower output
voltage will act as a constant voltage source, while the supply set to the higher
output will act as a current-limited source, dropping its output voltage until it
equals that of the other supply. The constant voltage source will deliver only that
fraction of its rated output current necessary to fulfill the total current demand.
24 Keysight E3620A Operating and Service Manual
Load Considerations
This section provides information on operating your supply with various types of
loads connected to its output.
Pulse Loading
The power supply will automatically cross over from constant-voltage to
current-limit operation in response to an increase in the output current over the
preset limit. Although the preset limit may be set higher than the average output
current, high peak currents (as occur in pulse loading) may exceed the preset
current limit and cause crossover to occur and degrade performance.
Reverse Current Loading
An active load connected to the supply may actually deliver a reverse current to
the supply during a portion of its operating cycle. An external source cannot be
allowed to pump current into the supply without risking loss of regulation and
possible damage to the output capacitor of the supply. To avoid these effects, it is
necessary to preload the supply with a dummy load resistor so that the supply
delivers current through the entire operating cycle of the load devices.
1
Keysight E3620A Operating and Service Manual 25
1
Figure 1-3 Reverse Current Loading Solution
Output Capacitance
An internal capacitor across the output terminals of the supply helps to supply
high-current pulses of short duration during constant-voltage operation. Any
capacitance added externally will improve the pulse current capability, but will
decrease the load protection provided by the current limiting circuit. A
high-current pulse may damage load components before the average output
current is large enough to cause the current limiting circuit to operate.
26 Keysight E3620A Operating and Service Manual
Reverse Voltage Protection
A diode is connected across the output terminals with reverse polarity. This diode
protects the output electrolytic capacitors and the series regulator transistors
from the effects of a reverse voltage applied across the output terminals. Since
series regulator transistors cannot withstand reverse voltage either, diodes are
also connected across them. When operating supplies in parallel, these diodes
protect an unenergized supply that is in parallel with an energized supply.
1
Keysight E3620A Operating and Service Manual 27
1
Service Information
Maintenance
Introduction
This section provides performance test, troubleshooting information, and
adjustment and calibration procedures. The following operation verification tests
comprise a short procedure to verify that the power supply is performing properly,
without testing all specified parameters.
If a fault is detected in the power supply while making the performance check or
during normal operation, proceed to the troubleshooting procedures. After
troubleshooting, perform any necessary adjustments and calibrations. Before
returning the power supply to normal operation, repeat the performance check to
ensure that the fault has been properly corrected and that no other faults exist.
Test Equipment Required
Table 1-2 lists the equipment required to perform the various procedures
described in this section.
Operation Verification Tests
The following tests assure that the power supply is performing properly. They do
not, however, check all the specified parameters tested in the complete
performance test described below. Proceed as follows:
1 Perform turn-on checkout procedure given in page 21.
2 Perform the load regulation performance tests given in the following
paragraphs.
28 Keysight E3620A Operating and Service Manual
Table 1-2 Test Equipment Required
Type Required Characteristics Use Recommended Model
Oscilloscope
Sensitivity: 100 ƒÝV
Bandwidth: 20 MHz/100 MHz
Display transient response and
ripple and noise waveforms.
1
Keysight 54503A
RMS Voltmeter True rms, 20 MHz bandwidth
Sensitivity : 1 mV
Accuracy : 5%
Multimeter Resolution : 100 nV
Accuracy : 0.0035%
Voltage Range : 240 VDC
Electronic Load
Resistive Loads (RL) 25 Ă 5% 100 W Measure ripple and noise
Current Sampling
Resistor (Shunt)
Variable Voltage
Auto Transformer
Current Range : 10 ADC
Open and short switches
Transient on/off
0.1 Ă 0.1% 3 W Measure output current.
Range : 85-130 and 200-260
Volts
Measure rms ripple and
voltage.
Measure DC voltages. Keysight 34401A
Measure load and line
regulation.
Vary AC input
Line Voltage Option Conversion
To convert the supply from one line voltage option to another, the following three
steps are necessary:
1 After making certain that the line cord is disconnected from a source of power,
remove the top cover from the supply and set the two sections of the line
voltage selector switch for the desired line voltage (see Figure 1-4).
Keysight 6063A
2 Check the rating of the installed fuse and replace it with the correct value, if
necessary. For Option OE3, use a slow-blow 1 amp fuse. For standard and
Option OE9, use a slow-blow 2 amp fuse.
Keysight E3620A Operating and Service Manual 29
1
3 Mark the instrument clearly with a tag or label indicating the correct line
voltage to be used.
Figure 1-4 Line Voltage Selector (set for 115 VAC)
30 Keysight E3620A Operating and Service Manual
Performance Tests
CAUTION
The following paragraphs provide test procedures for verifying the power supply's
compliance with the specifications of Table 1. Proceed to the troubleshooting
procedures if you observe any out of specification performance.
Before applying power to the supply, make certain that its line voltage
selector switch (S1) is set for the line voltage to be used. (See CAUTION
notice in operating section for additional information on S1.)
General Measurement Techniques
Connecting Measuring Devices. To achieve valid results when measuring load
regulation, ripple and noise, and transient response time of the supply, measuring
devices must be connected as close to the output terminals as possible. A
measurement made across the load includes the impedance of the leads to the
load. The impedance of the load leads can easily be several orders of magnitude
greater than the supply impedance and thus invalidate the measurement. To
avoid mutual coupling effects, each measuring device must be connected directly
to the output terminals by separate pairs of leads.
1
When performance measurements are made at the front terminals (Figure 1-5)
the load should be plugged into the front of the terminals at (B) while the
monitoring device is connected to a small lead or bus wire inserted through the
hole in the neck of the binding post at (A). Connecting the measuring device at (B)
would result in a measurement that includes the resistance of the leads between
the output terminals and the point of connection.
Selecting Load Resistors. Power supply specifications are checked with a full load
resistance connected across the supply output. The resistance and wattage of the
load resistor, therefore, must permit operation of the supply at its rated output
voltage and current. For example, a supply rated at 25 volts and 1 amp would
require a load resistance of 25W at the rated output voltage. The wattage rating of
this resistor would have to be at least 25 watts.
Keysight E3620A Operating and Service Manual 31
1
Figure 1-5 Front Panel Terminal Connections
Electronic Load. Some of the performance test procedures require to use an
electronic load to test the supply quickly and accurately. An electronic load is
considerably easier to use than a load resistor. It eliminates the need for
connecting resistors or rheostats in parallel to handle the power, and it is much
more stable than a carbon-pile load. It is easier to switch between load conditions
as required for the load regulation and load transient response tests.
Output Current Measurement. For accurate output current measurements, a
current sampling resistor should be inserted between the load and the output of
the supply. To simplify grounding problems, one end of this sampling resistor
should be connected to the same output terminal of the supply which will be
shorted to ground. An accurate voltmeter is then placed across the sampling
resistor and the output current is calculated by dividing the voltage across the
sampling resistor by its ohmic value. The total resistance of the series combination
should be equal to the full load resistance as determined in the preceding
paragraphs. Of course, if the value of the sampling resistor is very low when
compared to the full load resistance, the value of the sampling resistor may be
ignored. The meter shunt recommended in Table 1- 2, for example, has a
resistance of only 100 mW and can be neglected when calculating the load
resistance of the supply. Figure 1-6 shows a four terminal meter shunt. The load
current through a shunt must be fed from the extremes of the wire leading to the
resistor while the sampling connections are made as close as possible to the
resistance portion itself.
32 Keysight E3620A Operating and Service Manual
Figure 1-6 Current Sampling Resistor Connections
Rated Output, Meter Accuracy, and Current Limit
To check that all supplies will furnish their maximum rated output voltage and
current, that the front panel meters are accurate, and that the current limit circuits
function, proceed as follows:
1
Rated Output Voltage and Vol tmeter Accuracy
1 With no loads connected: turn on the supply and push the V1 METER switch
in. Connect a DVM between the V1 + and - terminals and set V1 VOLTAGE
control until front panel voltmeter indicates 17.00 volts.
2 Check the DVM indication. It should be within ±(0.5% + 2 counts) of the front
panel voltmeter indication (16.90 to 17.10 V).
3 Set V1 VOLTAGE control clockwise until front panel voltmeter indicates 25.0
volts.
4 DVM should indicate 25 volts ±(0.5% + 2 counts) (24.675 V to 25.325 V).
5 Repeat steps 1 through 4 for the V2 supply.
Keysight E3620A Operating and Service Manual 33
1
Rated Output Current and Ammeter Accuracy
6 Connect the test setup shown Figure 1-7 to the V1 supply's +and –output
terminals.
7 Push the V1 METER switch in to monitor the V1 supply's output current.
8 Close the load switch and adjust V1 VOLTAGE control until front panel
ammeter indicates 1.000 A.
9 Check that DVM indicates a voltage drop across the current sampling resistor
that corresponds to a current of 1 amp ±(0.5% + 2 counts) (0.993 A to 1.007 A).
10 Open the load switch and repeat steps (6) through (9) for the V2 supply.
Figure 1-7 Output Current, Test Set Up
Current Limit
11 Disconnect all loads from the supply.
12 Connect the test setup shown in Figure 1-7 to the V1 supply's + and - output
terminals. Substitute a short for R
and leave the load switch open.
L
13 Push the V1 METER switch in and adjust the V1 VOLTAGE control fully
clockwise.
34 Keysight E3620A Operating and Service Manual
14 Close the load switch and determine the current flow through the current
sampling resistor R
by measuring its voltage drop with the DVM. The current
S
should be minimum 1 A + 5%.
15 Open the load switch and repeat steps (11) through (14) for the V2 supply.
Load Regulation (Load Effect)
1
Definition: The immediate change, • E
, in the static value of DC output voltage
OUT
resulting from a change in load resistance from open circuit to the value that
yields maximum rated output current (or vice versa).
To check the load regulation:
1 Connect the test equipment across the output of the V1 supply as shown in
Figure 1-8. Operate the electronic load in constant current mode and set its
current to 1.000 A. Input off the electronic load.
2 Turn on the supply. Push the V1 METER switch in and adjust its voltage to 25.0
volts. Then input on the electronic load.
3 Record the voltage indicated on the DVM.
4 Operate the electronic load in open (input off) mode and recheck the DVM
indication immediately. The readings’ difference during the immediate change
should be within 0.01% plus 2 mV of the reading in step (3).
5 Repeat steps (1) through (4) for the V2 supply.
Keysight E3620A Operating and Service Manual 35
1
Figure 1-8 Basic Test Setup
Line Regulation (Source Effect)
Definition: The immediate change, • E
resulting from a change in AC input voltage from a minimum to a maximum value
(±10% of nominal voltage).
To check the line regulation:
1 Connect a variable autotransformer between the input power source and the
power supply line plug.
2 Connect the test equipment across the output of the V1 supply as shown in
Figure 1-8. Operate the electronic load in constant current mode and set its
current to 1.000 A. Input off the electronic load.
3 Adjust the autotransformer for a low line input (-10% of nominal voltage).
4 Turn on the power. Push the V1 METER switch in and adjust the output of the
supply to 25.0 volts, then input on the electronic load. Record the DVM
indication.
5 Adjust the autotransformer for high line voltage input (+10% of nominal
voltage) and recheck the DVM indication immediately. The readings’ difference
36 Keysight E3620A Operating and Service Manual
, in the static value of DC output voltage
OUT
during the immediate change should be within 0.01% plus 2 mV of the reading
in step (4).
f. Repeat steps (2) through (5) for the V2 supply.
Ripple and Noise (Normal Mode Voltage)
Definition: Ripple and noise are measured in the rms or peak-to-peak value over a
20 Hz to 20 MHz bandwidth. Fluctuations below the lower frequency limit are
treated as drift.
RMS Measurement
The rms measurement is not an ideal representation of the noise, since fairly high
output noise spikes of short duration could be present in the ripple and not
appreciably increase the rms value.
To measure the ripple and noise of the rms value on each output supply output:
1 Connect the test equipment across the output of the V1 supply as shown in
Figure 1-9.
2 Turn on the supply and push the V1 METER switch in.
3 Adjust the output of the V1 supply to 25.0 volts.
4 Check that the rms noise voltage at the true rms voltmeter is less than 0.35
mV.
5 e.Repeat steps (1) through (4) for the V2 supply.
1
Keysight E3620A Operating and Service Manual 37
1
Figure 1-9 Ripple and Noise rms Measurement Test Setup
Peak-to-Peak Measurement
The peak-to-peak measurement is particularly important for applications where
noise spikes could be detrimental to a sensitive load, such as logic circuitry.
To measure the ripple and noise of the peak-to-peak value on each output supply
output:
1 Connect the test equipment across the output of the V1 supply as shown in
Figure 1-9, but replace the true rms voltmeter with the oscilloscope.
2 Turn on the supply and push the V1 METER switch in.
3 Adjust the output of the V1 supply to 25.0 volts.
4 Set the oscilloscope to AC mode and bandwidth to 20 MHz.
5 Check that the peak-to-peak noise is less than 1.5 mV.
6 Repeat steps (1) through (4) for the V2 supply.
38 Keysight E3620A Operating and Service Manual
Common Mode Current (CMI)
Definition: Common mode current is that AC current component which exists
between any or all supply or output lines and chassis ground.
To measure the common mode current:
1 Connect the full load for the V1 output terminal.
2 Connect a 100 kW resistor (R
- terminal and chassis ground.
3 Connect the DVM across R
4 Turn on the supply.
5 Record the voltage across R
by RS.
6 f. Check that the current is less than 1mA.
7 g. Repeat steps (1) through (6) for the V2 supply.
Load Transient Response Time
) and a 2200 pF capacitor in parallel between V1
S
. Operate the DVM in AC voltage mode.
S
and convert it to current by dividing this voltage
S
1
Definition: This is the time for the output voltage to return to within a specified
band around its voltage following a change from full load to half load or half
load to full load.
To measure the load transient response time:
1 Connect the test equipment across the output of the V1 supply as shown in
Figure 1-8, but replace the DVM with the oscilloscope. Operate the electronic
load in constant current mode.
2 Turn on the supply and push the V1 METER switch in.
3 Turn up V1 output voltage to 25.0 volts.
4 Set the electronic load to transient operation mode between one half of
supply's full rated value and supply's full rated value at a 1 kHz rate with 50%
duty cycle.
5 Set the oscilloscope for AC coupling, internal sync and lock on either the
positive or negative load transient.
6 Adjust the oscilloscope to display transients as shown in Figure 1-10.
Keysight E3620A Operating and Service Manual 39
1
7 Check that the pulse width (t
is no more than 50 msec as shown.
8 Repeat steps (1) through (7) for the V2 supply.
Stability (Drift)
Definition: The change in output voltage (DC to 20 Hz) for the first 8 hours
following a 30-minute warm-up period with constant input line voltage,
constant load resistance and constant ambient temperature.
To measure the stability:
1 Connect the test equipment across the output of the V1 supply as shown in
Figure 1-8.
2 Operate the electronic load in constant current mode and set its current to
1.000 A.
3 Turn on the supply and push the V1 METER switch in.
4 Turn up V1 output voltage to 25.0 volts as read on the digital voltmeter.
5 After a 30-minute warm-up, note the voltage on DVM.
6 The output voltage reading should deviate less than 0.1% plus 5 mV from the
reading obtained in step (5) over a period of 8 hours.
) of the transients at 15 mV from the base line
2-t1
7 Repeat steps (1) through (6) for the V2 supply.
40 Keysight E3620A Operating and Service Manual
1
CAUTION
Figure 1-10 Load Transient Response Time Waveform
TROUBLESHOOTING
Before attempting to troubleshoot the power supply, ensure that the fault is with
the supply and not with an associated piece of equipment. You can determine this
without removing the covers from the power supply by using the appropriate
portions of the "Performance Tests" paragraph.
Before applying power to the supply, make certain that its line voltage
selector switch (S1) is set for the line voltage to be used.
Keysight E3620A Operating and Service Manual 41
1
Open Fuse Troubleshooting
Although transients or fatigue can cause a fuse to blow, it is a good idea to
inspect the unit for obvious shorts such as damaged wiring, charred components,
or extraneous metal parts or wire clippings in contact with circuit board
conductors before replacing the fuse. The rating of the correct replacement fuse
depends on the line voltage option of the instrument: for Option OE3, use a
slow-blow 1 amp fuse and standard and Option OE9, use a slow-blow 2 amp fuse.
ADJUSTMENT AND CALIBRATION
Current Limit Adjustment
To adjust the current limit circuit in the V1 or V2 supply, proceed as follows:
1 Turn the current limit adjustment pot (R63 for V1 supply or R34 for V2 supply)
to fully counter clockwise.
2 Connect the test setup shown in Figure 1-7 to the output of the supply to be
adjusted. Substitute a short for R
3 Turn on the supply and set the VOLTAGE control for maximum output (fully
clockwise).
4 Close load switch and adjust the current limit pot (R63 or R34) until the DVM
indicates a voltage drop across the shunt of 0.1 V + 5% (0.105 V).
and leave load circuit switch open.
L
Meter Calibration
Voltmeters. To calibrate voltmeter, proceed as follows:
1 Connect DVM across V1 + and - output terminal.
2 Turn on the supply and push V1 METER switch in.
3 Set the output voltage to 17.00 volts, and adjust R16 on the display board
until front panel VOLTS display reads exactly DVM value. Next, set the output
voltage to 25.0 volts and adjust R17 on the display board until front panel
VOLTS display reads exactly DVM value.
4 To calibrate the voltmeter for V2 output, push V2 METER switch in and
connect DVM across V2 + and —output terminal.
5 Set the output voltage to 15.00 V and then adjust R81 on the main board until
front panel VOLTS display reads exactly DVM value.
42 Keysight E3620A Operating and Service Manual
Ammeters. To calibrate ammeter for V1 and V2 supplies, proceed as follows:
1 Connect the test setup shown in Figure A-4 to the output of the V1 supply.
Substitute a short for RL and leave load circuit switch open.
2 Push V1 METER switch in and turn V1 VOLTAGE control fully clockwise.
3 Close the load switch and adjust R5 on the display board until front panel
AMPS display reads exactly DVM value divided by R
.
S
4 To calibrate the ammeter for V2 output, repeat step (1) to the V2 supply.
Select V2 METER switch and turn V2 VOLTAGE control fully clockwise.
5 Adjust R80 on the main board until front panel AMPS display reads exactly
DVM value divided by R
.
S
1
Keysight E3620A Operating and Service Manual 43
1
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44 Keysight E3620A Operating and Service Manual
Keysight E3620A Dual Output Power Supply
Operating and Service Manual
Component Locator Diagrams
Main Board — Top
45
2
Main Board — Bottom
46 Keysight E3620A Operating and Service Manual
Display Controller — Top
2
Keysight E3620A Operating and Service Manual 47
2
Display Controller — Bottom
48 Keysight E3620A Operating and Service Manual
7-Segment — Top
2
Keysight E3620A Operating and Service Manual 49
2
7-Segment — Bottom
50 Keysight E3620A Operating and Service Manual
This information is subject to change
without notice. Always refer to the
Keysight website for the latest
revision.
© Keysight Technologies 2002 - 2018
Edition 12, December 1, 2018
Printed in Malaysia
*E3620-90001*
E3620-90001
www.keysight.com
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