Agilent E3620A Operations Guide

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SAFETY SUMMARY

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The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument.
Failure to compl
manufacture, and intended use of the instrument. Hewlett-Packard Compan

with these requirements.

compl

with these precautions or with specific warnings elsewhere in this manual violates safety standards of design,

assumes no liability for the customer's failure to

BEFORE APPLYING POWER.

Verif

that the product is set to match the available line volt-

a

e and that the correct fuse is installed.

GROUND THE INSTRUMENT.

This product is a Safet
protective earth terminal). To minimize shock hazard, the
instrument chassis and cabinet must be connected to an
electrical
ac power suppl
cable, with the third wire firml

round(safety ground) at the power outlet. Any interruption of
the protective(
protective earth terminal will cause a potential shock hazard
that could result in personal injur
ener
tion, be certain that the autotransformer common terminal is
connected to the neutral(earthed pole) of the ac power lines
(suppl

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE.

Do not operate the instrument in the presence of flammable

ases or fumes.

KEEP AWAY FROM LIVE CIRCUITS.

Operatin
Component replacement and internal adjustments must be
made b
nents with power cable connected. Under certain conditions,
dan
removed. To avoid injuries, alwa
char
touchin

DO NOT SERVICE OR ADJUST ALONE.

Do not attempt internal service or adjustment unless another
person, capable of renderin
present.

round. The instrument must be connected to the

rounding) conductor or disconnection of the

ized via an external autotransformer for voltage reduc-

mains).

personnel must not remove instrument covers.

qualified service personnel. Do not replace compo-

erous voltages may exist even with the power cable

e circuits and remove external voltage sources before

components.

Class I instrument (provided with a

mains through a three-conductor power

connected to an electrical

. If the instrument is to be

s disconnect power, dis-

first aid and resuscitation, is

SAFETY SYMBOLS

Instruction manual s
will be marked with this s

!

or

DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT.

Because of the dan
not install substitute parts or perform an
fication to the instrument. Return the instrument to a Hewlett­Packard Sales and Service Office for service and repair to
ensure that safet

necessar
instruction manual.

Indicate earth(

The WARNING si
calls attention to a procedure, practice,
or the like, which, if not correctl
formed or adhered to, could result inper­sonal injur
WARNING si
ditions are full

The CAUTION si
calls attention to an operatin
or the like, which, if not correctl
formed or adhered to, could result in
dama
the product. Do not proceed be
CAUTION si
tions are full

The NOTE si
mation. It calls attention to a procedure,
practice, condition or the like, which is
essential to hi

er of introducing additional hazards, do

features are maintained.

for the user to refer to the

. Do not proceed beyond a

e to or destruction of part or all of

n until the indicated condi-

understood and met.

mbol; the product

mbol when it is

round) terminal.

n denotes a hazard. It

per-

n until the indicated con­ understood and met.

n denotes a hazard. It

procedure,

per-

ond

n denotes important infor-

hlight.

unauthorized modi-

Instruments that appear damaged or defective should be made inoperative and secured against unintended
operation until the

can be repaired by qualified service personnel.

1-2

Table of Contents

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SAFETY SUMMARY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

SAFETY AND EMC REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

INSTRUMENT AND MANUAL IDENTIFICATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

ACCESSORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

ORDERING ADDITIONAL MANUALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

LINE FUSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

INITIAL INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Mechanical Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Electrical Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

INSTALLATION DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Location and Coolin
Outline Dia
Rack Mountin

INPUT POWER REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Power Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

ram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Line Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Volta

e and Current Metering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Volta

e Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

TURN-ON CHECKOUT PROCEDURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Overload Protection Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Operation Be
Connectin

Series Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Parallel Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

ond Rated Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

LOAD CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7

PULSE LOADING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

REVERSE CURRENT LOADING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

OUTPUT CAPACITANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

REVERSE VOLTAGE PROTECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

1-3

GENERAL INFORMATION

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DESCRIPTION

The Model E3620A Dual Output Power Supply is a compact,
constant volta
lated 0 to 25 V outputs rated at 1 A. It is an ideal power suppl
for design and breadboard work where single or dual voltages
are required. Each output volta

hout its range and separate current limit circuits protect

throu
each output a

Connections to the outputs are made to bindin
minals on the front panel. The outputs can be used individu­all

or in combination to satisfy any number of output
demands. The positive or ne
can be

round terminal is located on the front panel of the supply.

The front panel also contains a line switch, output volta
controls, an autoran

ital ammeter, and two meter select pushbutton switches.

di
The meter pushbuttons select both volta
monitorin
with a detachable, 3-wire
line fuse is an extractor t

SAFETY CONSIDERA TIONS

This product is a Safety Class I instrument, which means that
it is provided with a protective earth
minal must be connected to an ac source that has a 3-wire

round receptacle. Review the instrument rear panel and this
manual for safet
the instrument. Refer to the Safety Summary page at the

inning of this manual for a summary of general safet

be
information. Specific safety information is located at the
appropriate places in this manual.

SAFETY AND EMC REQUIREMENTS

This power supply is designed to comply with the followin
safety and EMC(Electromagnetic Compatibility) require-

ments:B

e/current limiting supply that delivers two iso-

e is continuously variable

ainst overload or short circuit damage.

post type ter-

ative terminal of each output

rounded or each output can be left floating. A chassis

digital voltmeter and a single-range

e and current

for the output V1 and V2. The supply is furnished

rounding type line cord. The ac

pe fuseholder on the rear heat sink.

round terminal. This ter-

markings and instructions before operatin

 EN 50082-1(1992) /

IEC 801-2(1991): Electrostatic Dischar
IEC 801-3(1984): Radiated Electroma

Requirements

IEC 801-4(1988): Electrical Fast Transient/Burst

Requirements

e Requirements

netic Field

INSTRUMENT AND MANUAL IDENTIFICA TION

A serial number identifies your power supply. The serial num­ber encodes the countr

nificant design change, and a unique sequential

est si
number. The letter "KR" desi
manufacture, the first one di
5=1995, and so forth), and the second two di
week. The remainin

it number assigned sequentially.

five-di

If the serial number on

e

on the title pa
supplied with the manual to explain the difference between

our instrument and the instrument described by this manual.
The Chan
in

errors in the manual.

e of the manual, a yellow Change Sheet is

e Sheet may also contain information for correct-

of manufacture, the week of the lat-

nates Korea as the country of
it indicates the year (4=1994,

its indicate the

digits of the serial number are a unique,

our supply does not agree with those

OPTIONS

Options 0E3 and 0E9 determine which line voltage is
selected at the factor
115 Vac ± 10%, 47-63 Hz input.

Option No. Description

0E3: 230 Vac ± 10%, 47-63 Hz Input
0E9: 100 Vac ± 10%, 47-63 Hz Input

. The standard unit is configured for

ACCESSORY

The accessory listed below may be ordered from your local
Hewlett-Packard Sales Office either with the power suppl
separatel
address.)

HP Part No. Description

5063-9240 Rack Kit for mountin

. (Refer to the list at the rear of the manual for

one or two 3 1/2" high

supplies in a standard 19" rack

or

 IEC 1010-1(1990)/EN 61010 (1993): Safet

ments for Electrical Equipment for Measurement, Control,
and Laborator

 CSA C22.2 No.231: Safet

and Electronic Measurin

 UL 1244: Electrical and Electronic Measurin

Equipment

 EMC Directive 89/336/EEC: Council Directive entitled

Approximation of the Laws of the Member States relatin
to Electroma

 EN 55011(1991) Group 1, Class B/CISPR 11 (1990):

Limits and Methods of Radio Interference Characteristics
of Industrial, Scientific, and Medical(ISM) Radio­Frequenc

netic Compatibilit

Equipment

Use

Requirements for Electrical

and Test Equipment

Require-

and T esting

The rack mount kit is needed for rack mountin
E3620A power suppl

.

of the

ORDERING ADDITIONAL MANUALS

One manual is shipped with each power supply. (Option 910
is ordered for each extra manual.) Additional manuals ma
also be purchased separatel
sales office (see the list at the rear of this manual for
addresses). Specif
HP Part Number provided on the title pa

the model number, serial prefix, and the

for your local Hewlett-Packard

e.

SPECIFICA TIONS

Instrument specifications are listed in Table 1. These specifi­cations are performance standards or limits a
instrument is tested.

1-4

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Outline Diagram

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Figure 1 illustrates the outline shape and dimensions of the

.

suppl

Rack Mountin

This supply may be rack mounted in a standard 19-inch rack
panel either b
the ACCESSORY, pa
accessory. The rack-mounting kit includes complete installa­tion instructions.

itself or alongside a similar unit. Please see

e 1-4, for available rack mountin

INPUT POWER REQUIREMENTS

Depending on the line voltage option ordered, the supply is

to be operated from one of the power sources listed in

read
Table 1. A label on the rear heat sink shows the nominal input
volta

e set for the supply at the factory.

Power Cable

To protect operating personnel, the supply should be

rounded. This supply is equipped with a three conductor
power cable. The third conductor is the
when the cable is plu

is grounded. The power supply is equipped at the fac-

suppl

with a power cord plug appropriate for the user's location.

tor
Notif

the nearest HP Sales and Service Office if the appro-

priate power cord is not included with the suppl

ed into an appropriate receptacle, the

round conductor and

.

Before applying power to the supply, check the label on the
heat sink to make certain that the suppl
a

rees with the line voltage to be used. If the option does not
correspond to
VOLTAGE OPTION CONVERSION" in the service section
before appl

our line voltage, refer to paragraph "LINE

power.

's line voltage option

Figure 2. Front-Panel Controls and Indicators

Figure 1. Outline Diagram

OPERATING INSTRUCTIONS

INTRODUCTION

This section describes the operating controls and indicators,
turn-on checkout procedures, and other operatin
ations for the Model E3620A Dual Output Power Suppl

consider-

.

CONTROLS

Line Switch

The LINE pushbutton switch ( , Figure 2) is pushed-in to
turn the suppl

OFF.

suppl

Voltage and Current Meterin

Two meter select pushbutton switches ( and ) permit the
output volta
monitored on the VOLTS/AMPS meter. The V1 and V2 output
select pushbuttons connect the desired output to the meter-

circuit when the applicable button is pushed in.

in

Be careful that both METER pushbuttons are not released
(out-position) or pushed in simultaneousl

Voltage Controls

The V1 and V2 voltage controls ( and ) set the voltage
level of the correspondin
turn potentiometers.

ON and released (out position) to turn the

e and current of either output (V1 or V2) to be

.

output. The voltage controls are 10

1-6

TURN-ON CHECKOUT PROCEDURE

g

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y

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y

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g

g

g

g

g

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y

y

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y

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g

y

y

y

y

g

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y

The following steps describe the use of the Model E3620A
front panel controls illustrated in Fi
check that the suppl
cedure or the more detailed performance test of service infor­mation section when the instrument is received and before it
is connected to an
detailed performance test be
section if an

a. Connect line cord to power source and push LINE

switch ( ) in.

b. Push the V1 meter select pushbutton switch ( ) to in-

position to monitor suppl
load connected, var
ran

e and check that the voltmeter responds to the con

trol setting and the ammeter indicates zero.

c. Turn the V1 volta

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
nals.

d. 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 suppl
reveals a possible malfunction, see the service information
section for detailed test, troubleshootin
cedures.

is operational. Follow this checkout pro-

load equipment. Proceed to the more

difficulties are encountered.

the V1 voltage control ( ) over its

e control ( ) fully clockwise and

o

C. Remove the short from the output termi-

ure 2 and serve as a brief

inning in service information

's V1 output voltage. With no

, and adjustment pro-

OPERA TION

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

the suppl

Overload Protection Circuits

The outputs are individually protected against overload or
short circuit dama
circuits are factor
mum 1 A + 5%. The current limits are set b
the V1 suppl
dia
the output current remains below the current limit settin

round) or, the + or - terminal of either output can be

rounded to the chassis ground terminal which is located on

's front panel.

e by separate current limiting circuits. The

adjusted to limit the output current to mini-

adjusting R63 in

and R34 in the V2 supply (see the schematic

ram). No deterioration of supply performance occurs if

.

Operation Beyond Rated Output

The supply may be able to provide voltages and currents

reater 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 dama
performance can not be
above the rated output of 0 to 25 V at 1 A.

uaranteed to meet specifications

e to the supply, but

Connecting Load

Connect each load to the power supply output terminals usin
separate pairs of connecting wires. This will minimize mutual

effects between loads and takes full advantage of

couplin
the low output impedance of the suppl
of adequatel
at the load.

Make each pair of connectin
twist or shield them to reduce noise pick-up. If a shield is
used, connect one end of the shield to the power suppl

round terminal and leave the other end unconnected.
If load considerations require locatin

terminals at a distance from the power suppl
suppl
tribution terminals b
load should be connected to the remote distribution terminals
separatel

heavy gauge to maintain satisfactory regulation

wires as short as possible and

output terminals should be connected to the remote dis-

a pair of twisted or shielded wires and each

.

. Load wires must be

output power distribution

, then the power

Series Operation

The two outputs (V1 and V2) can be connected in series to
obtain a volta

le output. Each output control (V1 and V2) must be adjusted

sin
in order to obtain the total output volta
internall
capacitors a
plies are connected in series and the output is shorted.

e (up to 50 V) higher than that available from a

e. Diodes connected

across each output protect the supply's output filter

ainst reverse voltages. This could occur if the sup-

Parallel Operation

The V1 and V2 supplies can be connected in parallel to obtain a
total output current
The total output current is the sum of the output currents of the
individual supplies. The output volta
suppl

should be set to the desired output voltage, and the other
set for a slightly larger output voltage. The supply set to

suppl
the lower output volta
while the suppl
ited source, droppin
other suppl
fraction of its rated output current necessar
rent demand.

reater than that available from one supply.

e controls of one power

e will act as a constant voltage source,

set to the higher output will act as a current-lim-

its output voltage until it equals that of the

. The constant voltage source will deliver only that

to fulfill the total cur-

During the actual operation of the V1 and V2 outputs, if a load

e causes the current limit to be exceeded, the OVER-

chan
LOAD LED is li
V2 supplies will protect the load b
imum 1 A + 5%. The V1 and V2 supplies are self restorin

hted. If overload conditions occur, the V1 and

limiting the current to min-

;

that is, when the overload is removed or corrected, the output

e is automatically restored to the previously set value.

volta

LOAD CONSIDERATIONS

This section provides information on operating your suppl
with various types of loads connected to its output.

PULSE LOADING

The power supply will automatically cross over from constant-

e to current-limit operation in response to an increase in

volta
the output current over the preset limit. Althou
limit ma

1-7

be set higher than the average output current, high

h the preset

peak currents (as occur in pulse loadin

g

g

y

g

y

g

y

y

g cy

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g

y

y

g

g

g

y

g

g

g

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y

preset current limit and cause crossover to occur and
de

rade performance.

) may exceed the

REVERSE CURRENT LOADING

An active load connected to the supply may actually deliver a
reverse current to the suppl
cycle. An external source can not be allowed to pump current
into the suppl
dama
effects, it is necessar
load resistor so that the supply delivers current through the
entire operatin

without risking loss of regulation and possible

e to the output capacitor of the supply. To avoid these

cle of the load devices.

during a portion of its operatin

to preload the supply with a dumm

OUTPUT CAP ACITANCE

An internal capacitor across the output terminals of the suppl
helps to supply high-current pulses of short duration durin
constant-voltage operation. Any capacitance added exter-

will improve the pulse current capability, but will

nall
decrease the load protection provided b
circuit. A high-current pulse may damage load components
before the avera
the current limitin

e output current is large enough to cause

circuit to operate.

the current limitin

REVERSE VOL TAGE PROTECTION

A diode is connected across the output terminals with reverse

. This diode protects the output electrolytic capacitors

polarit
and the series re
reverse volta
series re
either, diodes are also connected across them. When operat­in
suppl

ulator transistors can not withstand reverse voltage

supplies in parallel, these diodes protect an unenergized

that is in parallel with an energized supply.

ulator transistors from the effects of a

e applied across the output terminals. Since

Figure 3. Reverse Current Loading Solution

1-8

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Manual Update

In order to maintain a consistent appearance across all Hewlett-Packard products, the colors on the
following instruments have been changed. This update lists the changes as a result of the color change.
This update also provide information to correct manual errors or changes. Refer to this update when
ordering replacement parts.

Manual Identification

This update is used with the Operating and Service Guide of the

DC Power Supply

. Manual Part Number: E3620-90001. Manual Print Date: August 1997 (Edition 5).

For Instruments with Serial Numbers > KR41200101

HP E3620A Dual Output Lab Bench

Change 1:

On page 1-5, Meter Accuracy Specification at the Table 1, change as follows:

From: ± 0.5 % of full scale + 2 counts at 25 °C ± 5 °C
To: ± (0.5 % of output + 2 counts) at 25 °C ± 5 °C

Change 2:

Old HP

Part Number

8120-1378 8120-8767 Power cord for STD, 0E9
8120-1689 8120-8768 Power cord for 0E3
1853-0950 1853-0590 TRANSISTOR 2N4036 SI TO-5 PD=1W

Make the following changes to the Replaceable Parts List on page A-12 to A-13.

New HP

Part Number

Part Description

Rack Mounting Kits

The part numbers for the new rack mounting kits for the E3620A are listed below.

♦

To rack mount a single instrument, order:

Adapter Kit : 5063-9240

♦

To rack mount two instruments side by side, order:

Lock-Link Kit : 5061-9694
Flange Kit : 5063-9212

♦

To rack mount one or two instruments in a sliding support shelf, order:

Shelf : 5063-9255
Slide Kit : 1494-0015
(for a single instrument, also order filler panel 5002-3999)

Ó

Copyright Hewlett-Packard Company 1999

Printed in Korea August 1999 E0899

*E3620-90092*

E3620-90092