HP E3620A User manual

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1-2
SAFETY SUMMARY
The followin
g
g
eneral safet
y
precautions must be observed durin
g
all phases of operation, service, and repair of this instrument.
Failure to compl
y
with these precautions or with specific warnin
g
s elsewhere in this manual violates safet
y
standards of desi
g
n,
manufacture, and intended use of the instrument. Hewlett-Packard Compan
y
assumes no liabilit
y
for the customer's failure to
compl
y
with these requirements.
BEFORE APPLYING POWER.
Verif
y
that the product is set to match the available line volt-
a
g
e and that the correct fuse is installed.
GROUND THE INSTRUMENT.
This product is a Safet
y
Class I instrument (provided with a
protective earth terminal). To minimize shock hazard, the
instrument chassis and cabinet must be connected to an
electrical
g
round. The instrument must be connected to the
ac power suppl
y
mains throu
g
h a three-conductor power
cable, with the third wire firml
y
connected to an electrical
g
round(safet
y
g
round) at the power outlet. An
y
interruption of
the protective(
g
roundin
g
) conductor or disconnection of the
protective earth terminal will cause a potential shock hazard
that could result in personal injur
y
. If the instrument is to be
ener
g
ized via an external autotransformer for volta
g
e reduc-
tion, be certain that the autotransformer common terminal is
connected to the neutral(earthed pole) of the ac power lines
(suppl
y
mains).
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE.
Do not operate the instrument in the presence of flammable
g
ases or fumes.
KEEP AWAY FROM LIVE CIRCUITS.
Operatin
g
personnel must not remove instrument covers.
Component replacement and internal adjustments must be
made b
y
qualified service personnel. Do not replace compo-
nents with power cable connected. Under certain conditions,
dan
g
erous volta
g
es ma
y
exist even with the power cable
removed. To avoid injuries, alwa
y
s disconnect power, dis-
char
g
e circuits and remove external volta
g
e sources before
touchin
g
components.
DO NOT SERVICE OR ADJUST ALONE.
Do not attempt internal service or adjustment unless another
person, capable of renderin
g
first aid and resuscitation, is
present.
SAFETY SYMBOLS
Instruction manual s
y
mbol; the product
will be marked with this s
y
mbol when it is
necessar
y
for the user to refer to the
instruction manual.
Indicate earth(
g
round) terminal.
The WARNING si
g
n denotes a hazard. It
calls attention to a procedure, practice,
or the like, which, if not correctl
y
per-
formed or adhered to, could result inper-
sonal injur
y
. Do not proceed be
y
ond a
WARNING si
g
n until the indicated con-
ditions are full
y
understood and met.
The CAUTION si
g
n denotes a hazard. It
calls attention to an operatin
g
procedure,
or the like, which, if not correctl
y
per-
formed or adhered to, could result in
dama
g
e to or destruction of part or all of
the product. Do not proceed be
y
ond
CAUTION si
g
n until the indicated condi-
tions are full
y
understood and met.
The NOTE si
g
n denotes important infor-
mation. It calls attention to a procedure,
practice, condition or the like, which is
essential to hi
g
hli
g
ht.
DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT.
Because of the dan
g
er of introducin
g
additional hazards, do
not install substitute parts or perform an
y
unauthorized modi-
fication to the instrument. Return the instrument to a Hewlett-
Packard Sales and Service Office for service and repair to
ensure that safet
y
features are maintained.
Instruments that appear dama
g
ed or defective should be made inoperative and secured a
g
ainst unintended
operation until the
y
can be repaired b
y
qualified service personnel.
!
or

1-3
Table of Contents
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
g
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Outline Dia
g
ram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Rack Mountin
g
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
INPUT POWER REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Power Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6
INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Line Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Volta
g
e and Current Meterin
g
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Volta
g
e Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
TURN-ON CHECKOUT PROCEDURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Overload Protection Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Operation Be
y
ond Rated Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Connectin
g
Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Series Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Parallel Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
LOAD CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7
PULSE LOADING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
REVERSE CURRENT LOADING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
OUTPUT CAPACITANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
REVERSE VOLTAGE PROTECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

1-4
GENERAL INFORMATION
DESCRIPTION
The Model E3620A Dual Output Power Suppl
y
is a compact,
constant volta
g
e/current limitin
g
suppl
y
that delivers two iso-
lated 0 to 25 V outputs rated at 1 A. It is an ideal power suppl
y
for desi
g
n and breadboard work where sin
g
le or dual volta
g
es
are required. Each output volta
g
e is continuousl
y
variable
throu
g
hout its ran
g
e and separate current limit circuits protect
each output a
g
ainst overload or short circuit dama
g
e.
Connections to the outputs are made to bindin
g
post t
y
pe ter-
minals on the front panel. The outputs can be used individu-
all
y
or in combination to satisf
y
an
y
number of output
demands. The positive or ne
g
ative terminal of each output
can be
g
rounded or each output can be left floatin
g
. A chassis
g
round terminal is located on the front panel of the suppl
y
.
The front panel also contains a line switch, output volta
g
e
controls, an autoran
g
in
g
di
g
ital voltmeter and a sin
g
le-ran
g
e
di
g
ital ammeter, and two meter select pushbutton switches.
The meter pushbuttons select both volta
g
e and current
monitorin
g
for the output V1 and V2. The suppl
y
is furnished
with a detachable, 3-wire
g
roundin
g
t
y
pe line cord. The ac
line fuse is an extractor t
y
pe fuseholder on the rear heat sink.
SAFETY CONSIDERATIONS
This product is a Safet
y
Class I instrument, which means that
it is provided with a protective earth
g
round terminal. This ter-
minal must be connected to an ac source that has a 3-wire
g
round receptacle. Review the instrument rear panel and this
manual for safet
y
markin
g
s and instructions before operatin
g
the instrument. Refer to the Safet
y
Summar
y
pa
g
e at the
be
g
innin
g
of this manual for a summar
y
of
g
eneral safet
y
information. Specific safet
y
information is located at the
appropriate places in this manual.
SAFETY AND EMC REQUIREMENTS
This power suppl
y
is desi
g
ned to compl
y
with the followin
g
safet
y
and EMC(Electroma
g
netic Compatibilit
y
) require-
ments:B
IEC 1010-1(1990)/EN 61010 (1993): Safet
y
Require-
ments for Electrical Equipment for Measurement, Control,
and Laborator
y
Use
CSA C22.2 No.231: Safet
y
Requirements for Electrical
and Electronic Measurin
g
and Test Equipment
UL 1244: Electrical and Electronic Measurin
g
and Testin
g
Equipment
EMC Directive 89/336/EEC: Council Directive entitled
Approximation of the Laws of the Member States relatin
g
to Electroma
g
netic Compatibilit
y
EN 55011(1991) Group 1, Class B/CISPR 11 (1990):
Limits and Methods of Radio Interference Characteristics
of Industrial, Scientific, and Medical(ISM) Radio-
Frequenc
y
Equipment
EN 50082-1(1992) /
IEC 801-2(1991): Electrostatic Dischar
g
e Requirements
IEC 801-3(1984): Radiated Electroma
g
netic Field
Requirements
IEC 801-4(1988): Electrical Fast Transient/Burst
Requirements
INSTRUMENT AND MANUAL IDENTIFICATION
A serial number identifies
y
our power suppl
y
. The serial num-
ber encodes the countr
y
of manufacture, the week of the lat-
est si
g
nificant desi
g
n chan
g
e, and a unique sequential
number. The letter "KR" desi
g
nates Korea as the countr
y
of
manufacture, the first one di
g
it indicates the
y
ear (4=1994,
5=1995, and so forth), and the second two di
g
its indicate the
week. The remainin
g
di
g
its of the serial number are a unique,
five-di
g
it number assi
g
ned sequentiall
y
.
If the serial number on
y
our suppl
y
does not a
g
ree with those
on the title pa
g
e of the manual, a
y
ellow Chan
g
e Sheet is
supplied with the manual to explain the difference between
y
our instrument and the instrument described b
y
this manual.
The Chan
g
e Sheet ma
y
also contain information for correct-
in
g
errors in the manual.
OPTIONS
Options 0E3 and 0E9 determine which line volta
g
e is
selected at the factor
y
. The standard unit is confi
g
ured for
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
ACCESSORY
The accessor
y
listed below ma
y
be ordered from
y
our local
Hewlett-Packard Sales Office either with the power suppl
y
or
separatel
y
. (Refer to the list at the rear of the manual for
address.)
HP Part No. Description
5063-9240 Rack Kit for mountin
g
one or two 3 1/2" hi
g
h
supplies in a standard 19" rack
The rack mount kit is needed for rack mountin
g
of the
E3620A power suppl
y
.
ORDERING ADDITIONAL MANUALS
One manual is shipped with each power suppl
y
. (Option 910
is ordered for each extra manual.) Additional manuals ma
y
also be purchased separatel
y
for
y
our local Hewlett-Packard
sales office (see the list at the rear of this manual for
addresses). Specif
y
the model number, serial prefix, and the
HP Part Number provided on the title pa
g
e.
SPECIFICATIONS
Instrument specifications are listed in Table 1. These specifi-
cations are performance standards or limits a
g
ainst which the
instrument is tested.

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1-6
Outline Dia
g
ram
Fi
g
ure 1 illustrates the outline shape and dimensions of the
suppl
y
.
Rack Mountin
g
This suppl
y
ma
y
be rack mounted in a standard 19-inch rack
panel either b
y
itself or alon
g
side a similar unit. Please see
the ACCESSORY, pa
g
e 1-4, for available rack mountin
g
accessor
y
. The rack-mountin
g
kit includes complete installa-
tion instructions.
INPUT POWER REQUIREMENTS
Dependin
g
on the line volta
g
e option ordered, the suppl
y
is
read
y
to be operated from one of the power sources listed in
Table 1. A label on the rear heat sink shows the nominal input
volta
g
e set for the suppl
y
at the factor
y
.
Power Cable
To protect operatin
g
personnel, the suppl
y
should be
g
rounded. This suppl
y
is equipped with a three conductor
power cable. The third conductor is the
g
round conductor and
when the cable is plu
gg
ed into an appropriate receptacle, the
suppl
y
is
g
rounded. The power suppl
y
is equipped at the fac-
tor
y
with a power cord plu
g
appropriate for the user's location.
Notif
y
the nearest HP Sales and Service Office if the appro-
priate power cord is not included with the suppl
y
.
Fi
g
ure 1. Outline Dia
g
ram
OPERATING INSTRUCTIONS
INTRODUCTION
This section describes the operatin
g
controls and indicators,
turn-on checkout procedures, and other operatin
g
consider-
ations for the Model E3620A Dual Output Power Suppl
y
.
Before appl
y
in
g
power to the suppl
y
, check the label on the
heat sink to make certain that the suppl
y
's line volta
g
e option
a
g
rees with the line volta
g
e to be used. If the option does not
correspond to
y
our line volta
g
e, refer to para
g
raph "LINE
VOLTAGE OPTION CONVERSION" in the service section
before appl
y
in
g
power.
Fi
g
ure 2. Front-Panel Controls and Indicators
CONTROLS
Line Switch
The LINE pushbutton switch ( , Fi
g
ure 2) is pushed-in to
turn the suppl
y
ON and released (out position) to turn the
suppl
y
OFF.
Volta
g
e and Current Meterin
g
Two meter select pushbutton switches ( and ) permit the
output volta
g
e 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 meter-
in
g
circuit when the applicable button is pushed in.
Be careful that both METER pushbuttons are not released
(out-position) or pushed in simultaneousl
y
.
Volta
g
e Controls
The V1 and V2 volta
g
e controls ( and ) set the volta
g
e
level of the correspondin
g
output. The volta
g
e controls are 10
turn potentiometers.

1-7
TURN-ON CHECKOUT PROCEDURE
The followin
g
steps describe the use of the Model E3620A
front panel controls illustrated in Fi
g
ure 2 and serve as a brief
check that the suppl
y
is operational. Follow this checkout pro-
cedure or the more detailed performance test of service infor-
mation section when the instrument is received and before it
is connected to an
y
load equipment. Proceed to the more
detailed performance test be
g
innin
g
in service information
section if an
y
difficulties are encountered.
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
y
's V1 output volta
g
e. With no
load connected, var
y
the V1 volta
g
e control ( ) over its
ran
g
e and check that the voltmeter responds to the con
trol settin
g
and the ammeter indicates zero.
c. Turn the V1 volta
g
e control ( ) full
y
clockwise and
short the +V1 output terminal ( ) to -V1 terminal ( )
with an insulated test lead. The ammeter should indi-
cate a short-circuit output current of minimum 1.0 A +
5% at 25 oC. Remove the short from the output termi-
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
y
reveals a possible malfunction, see the service information
section for detailed test, troubleshootin
g
, and adjustment pro-
cedures.
OPERATION
The dual outputs of the E3620A can be used individuall
y
, in
series, or in parallel. Each output can be floated (up to 240
volts off
g
round) or, the + or - terminal of either output can be
g
rounded to the chassis
g
round terminal which is located on
the suppl
y
's front panel.
Overload Protection Circuits
The outputs are individuall
y
protected a
g
ainst overload or
short circuit dama
g
e b
y
separate current limitin
g
circuits. The
circuits are factor
y
adjusted to limit the output current to mini-
mum 1 A + 5%. The current limits are set b
y
adjustin
g
R63 in
the V1 suppl
y
and R34 in the V2 suppl
y
(see the schematic
dia
g
ram). No deterioration of suppl
y
performance occurs if
the output current remains below the current limit settin
g
.
Durin
g
the actual operation of the V1 and V2 outputs, if a load
chan
g
e causes the current limit to be exceeded, the OVER-
LOAD LED is li
g
hted. If overload conditions occur, the V1 and
V2 supplies will protect the load b
y
limitin
g
the current to min-
imum 1 A + 5%. The V1 and V2 supplies are self restorin
g
;
that is, when the overload is removed or corrected, the output
volta
g
e is automaticall
y
restored to the previousl
y
set value.
Operation Beyond Rated Output
The suppl
y
ma
y
be able to provide volta
g
es and currents
g
reater than its rated maximum outputs if the line volta
g
e is at
or above its nominal value. Operation can be extended up to
5% over the rated output without dama
g
e to the suppl
y
, but
performance can not be
g
uaranteed to meet specifications
above the rated output of 0 to 25 V at 1 A.
Connecting Load
Connect each load to the power suppl
y
output terminals usin
g
separate pairs of connectin
g
wires. This will minimize mutual
couplin
g
effects between loads and takes full advanta
g
e of
the low output impedance of the suppl
y
. Load wires must be
of adequatel
y
heav
y
g
au
g
e to maintain satisfactor
y
re
g
ulation
at the load.
Make each pair of connectin
g
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 suppl
y
g
round terminal and leave the other end unconnected.
If load considerations require locatin
g
output power distribution
terminals at a distance from the power suppl
y
, then the power
suppl
y
output terminals should be connected to the remote dis-
tribution terminals b
y
a pair of twisted or shielded wires and each
load should be connected to the remote distribution terminals
separatel
y
.
Series Operation
The two outputs (V1 and V2) can be connected in series to
obtain a volta
g
e (up to 50 V) hi
g
her than that available from a
sin
g
le output. Each output control (V1 and V2) must be adjusted
in order to obtain the total output volta
g
e. Diodes connected
internall
y
across each output protect the suppl
y
's output filter
capacitors a
g
ainst reverse volta
g
es. This could occur if the sup-
plies are connected in series and the output is shorted.
Parallel Operation
The V1 and V2 supplies can be connected in parallel to obtain a
total output current
g
reater than that available from one suppl
y
.
The total output current is the sum of the output currents of the
individual supplies. The output volta
g
e controls of one power
suppl
y
should be set to the desired output volta
g
e, and the other
suppl
y
set for a sli
g
htl
y
lar
g
er output volta
g
e. The suppl
y
set to
the lower output volta
g
e will act as a constant volta
g
e source,
while the suppl
y
set to the hi
g
her output will act as a current-lim-
ited source, droppin
g
its output volta
g
e until it equals that of the
other suppl
y
. The constant volta
g
e source will deliver onl
y
that
fraction of its rated output current necessar
y
to fulfill the total cur-
rent demand.
LOAD CONSIDERATIONS
This section provides information on operatin
g
y
our suppl
y
with various t
y
pes of loads connected to its output.
PULSE LOADING
The power suppl
y
will automaticall
y
cross over from constant-
volta
g
e to current-limit operation in response to an increase in
the output current over the preset limit. Althou
g
h the preset
limit ma
y
be set hi
g
her than the avera
g
e output current, hi
g
h

1-8
peak currents (as occur in pulse loadin
g
) ma
y
exceed the
preset current limit and cause crossover to occur and
de
g
rade performance.
REVERSE CURRENT LOADING
An active load connected to the suppl
y
ma
y
actuall
y
deliver a
reverse current to the suppl
y
durin
g
a portion of its operatin
g
c
y
cle. An external source can not be allowed to pump current
into the suppl
y
without riskin
g
loss of re
g
ulation and possible
dama
g
e to the output capacitor of the suppl
y
. To avoid these
effects, it is necessar
y
to preload the suppl
y
with a dumm
y
load resistor so that the suppl
y
delivers current throu
g
h the
entire operatin
g
c
y
cle of the load devices.
Fi
g
ure 3. Reverse Current Loadin
g
Solution
OUTPUT CAPACITANCE
An internal capacitor across the output terminals of the suppl
y
helps to suppl
y
hi
g
h-current pulses of short duration durin
g
constant-volta
g
e operation. An
y
capacitance added exter-
nall
y
will improve the pulse current capabilit
y
, but will
decrease the load protection provided b
y
the current limitin
g
circuit. A hi
g
h-current pulse ma
y
dama
g
e load components
before the avera
g
e output current is lar
g
e enou
g
h to cause
the current limitin
g
circuit to operate.
REVERSE VOLTAGE PROTECTION
A diode is connected across the output terminals with reverse
polarit
y
. This diode protects the output electrol
y
tic capacitors
and the series re
g
ulator transistors from the effects of a
reverse volta
g
e applied across the output terminals. Since
series re
g
ulator transistors can not withstand reverse volta
g
e
either, diodes are also connected across them. When operat-
in
g
supplies in parallel, these diodes protect an unener
g
ized
suppl
y
that is in parallel with an ener
g
ized suppl
y
.

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ü

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 HP E3620A Dual Output Lab Bench
DC Power Supply . Manual Part Number: E3620-90001. Manual Print Date: August 1997 (Edition 5).
For Instruments with Serial Numbers > KR41200101
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: Make the following changes to the Replaceable Parts List on page A-12 to A-13.
Old HP
Part Number New HP Part Number Part Description
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
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)
*E3620-90092*
E3620-90092
Ó Copyright Hewlett-Packard Company 1999
Printed in Korea August 1999 E0899