Agilent E3630A 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

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

ized via an external autotransformer for voltage reduc­tion, be certain that the autotransformer common terminal is
connected to the neutral(earthed pole) of the ac power lines

mains).

(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

erous voltages may exist even with the power cable

removed. To avoid injuries, alwa

e circuits and remove external voltage sources before

char
touchin

components.

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

SAFETY SYMBOLS

Instruction manual s
will be marked with this s

Class I instrument (provided with a

round. The instrument must be connected to the

mains through a three-conductor power

connected to an electrical

rounding) conductor or disconnection of the

. If the instrument is to be

personnel must not remove instrument covers.

qualified service personnel. Do not replace compo-

s disconnect power, dis-

!

or

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

for the user to refer to the

round) terminal.

. Do not proceed beyond a

n until the indicated con­ understood and met.

e to or destruction of part or all of

n until the indicated condi-

understood and met.

n denotes important infor-

hlight.

mbol; the product

mbol when it is

n denotes a hazard. It

per-

n denotes a hazard. It

procedure,

per-

ond

DO NOT SERVICE OR ADJUST ALONE.

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

first aid and resuscitation, is

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

er of introducing additional hazards, do

unauthorized modi-

features are maintained.

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

INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

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

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

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

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

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

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

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

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

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

INITIAL INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Mechanical Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Electrical Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

INSTALLATION DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Location and Coolin
Outline Dia
Rack Mountin

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

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

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

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

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

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

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

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

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

Trackin

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

Operation Be
Connectin

Parallel Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Series Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Ratio Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

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

Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

LOAD CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8

PULSE LOADING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

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

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

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

1-3

GENERAL INFORMATION

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INTRODUCTION

This section contains general information concerning the
E3630A triple output power suppl
siderations, safet
manual identification, option and accessor
instrument description, and specifications.

and EMC requirements, instrument and

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
be

inning of this manual for a summary of general safet
information. Specific safety information is located at the
appropriate places in this manual.

markings and instructions before operatin

SAFETY AND EMC REQUIREMENTS

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

 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): Lim-

its and Methods of Radio Interference Characteristics of
Industrial, Scientific, and Medical(ISM) Radio - Fre­quenc

 EN 50082-1(1992) /

IEC 801-2(1991): Electrostatic Dischar

IEC 801-3(1984): Radiated Electroma

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

Use

netic Compatibilit

Equipment

ments

Requirements

Requirements

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
4=1994, and so forth), and the second two di
week. The remainin

it number assigned sequentially.

five-di

If the serial number on
on the title pa
supplied with the manual to explain the difference

e of the manual, a yellow Change Sheet is

of manufacture, the week of the lat-

digits of the serial number are a unique,

our supply does not agree with those

. Included are safety con-

information,

round terminal. This ter-

Require-

Requirements for Electrical

and Test Equipment

and T esting

e Require-

netic Field

nates Korea as the country of
it indicates the year (3=1993,

its indicate the

between
manual. The Chan
correctin

our instrument and the instrument described by this

e Sheet may also contain information for

errors in the manual.

OPTIONS

Options OE3 and OE9 determine which line voltage is
selected at the factor
Vac ± 10%, 47-63 Hz input.

Option No. Description

OE3: 230 Vac ± 10%, 47-63 Hz Input
OE9: 100 Vac ± 10%, 47-63 Hz Input
910: One additional operatin

. The standard unit is configured for 115

and service manual

shipped with the power suppl

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

5063-9767 Rack Kit for mountin

The rack mount kit is needed for rack mountin
E3630A power suppl

. (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

of the

DESCRIPTION

This constant-voltage/current-limiting triple output power sup-

combines two 0 to ±20V tracking outputs rated at 0.5

pl
amps with an additional sin
volts and 2.5 amps. The +20V and -20V trackin
also be used in series as a sin
Connections to the suppl
made to bindin
outputs share a common output terminal, which is isolated
from chassis

rounded.

All outputs are protected a
dama

e. The ±20V outputs are protected by circuits that limit
the output current to 110% of its nominal maximum. The over­load protection circuit for the +6V output has a current fold­back characteristic that reduces the output current as an
overload increases until onl
cuit. The 6V output current limit depends on the output termi­nal volta
and 1 amp at zero volts.

All controls, di
front panel. One volta
sets the volta
taneousl

providing a tracking ratio control in addition to the usual volt-

b
a

e control. With the tracking ratio control turned fully clockwise
to its "fixed" position, the dual outputs have a fixed 1:1 trackin
ratio. As the ±20V voltage control is adjusted, the voltage of the
ne

ative supply tracks the positive output within ±1%. Turnin
the tracking ratio control away from its fully clockwise position
switches the dual trackin

posts on the front panel. The supply's three

round so that any one output terminal can be

e and varies linearly between 2.75 amps at 6 volts

ital meter, and output terminals are located on the

es of the 0 to +20V and 0 to -20V outputs simul-

. These dual tracking outputs are made more versatile

le output that is rated at 0 to 6

outputs can

le 0 to 40V 0.5-amp output.

's output and to chassis ground are

ainst overload and short-circuit

1 amp flows through a short cir-

e control sets the 0 to 6V and another

outputs into a variable tracking ratio

1-4

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INSTALLATION

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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 an
have occurred in transit. Save all packing materials until the
inspection is completed. If dama
be filed with the carrier. The Hewlett-Packard 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

Perform the TURN-ON CHECKOUT PROCEDURE in the fol-

paragraph to confirm that the supply is operational.

lowin
Alternatel
MANCE TEST in the service information section.

, check the supply more fully using the PERFOR-

damage that ma

e is found, a claim should

cord plu
est HP Sales and Service Office if the appropriate power cord
is not included with the suppl

appropriate for the user's location. Notify the near-

.

INST ALLATION DATA

The instrument is shipped ready for bench operation. Before
appl
POWER REQUIREMENTS para

power to the supply, please read the INPUT

raph.

Location and Coolin

This instrument is air cooled. Sufficient space should be
allowed so that a free flow of coolin
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

o

C.

air can reach the sides

Outline Diagram

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.

Figure 1. Outline Diagram

OPERATING INSTRUCTIONS

INTRODUCTION

The following steps describe the use of the front panel con­trols and indicators 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

is operational. Follow this checkout pro-

load equipment.

ure 2 and serve as a brief

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.

suppl

The power suppl

ed into an appropriate receptacle, the

is equipped at the factory with a power

round conductor and

Figure 2. Front-Panel Controls and Indicators

1-6

Before applying power to the supply, check the label on the

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heat sink to make certain that the suppl
a

rees with the line voltage to be used. If the option does not

correspond to

our line voltage, refer to paragraph "LINE

's line voltage option

VOLTAGE OPTION CONVERSION" in the service section
before appl

power.

TURN -ON CHECKOUT PROCEDURE

a. Connect line cord to power source and turn LINE

switch on.

b. Push +6V METER switch and, with no load con-

nected, var
and check that the voltmeter responds to the control
settin

c. Set the +6V VOLTAGE control to 6 volts and short the

+6V output terminal to COM (common) terminal

with an insulated test lead. The ammeter should

indicate a short-circuit output current of approximatel

1.0 A. Remove the short from the output terminals.

d. Push the +20V METER switch and turn Trackin

Ratio control full
With no load connected, var

over its ran
responds to the control settin
cates zero.

e. Set the ±20V VOLTAGE control to 20 volts and

short the +20V output terminal to the COM terminal

with an insulated test lead. The ammeter should
indicate a short-circuit output current of 0.55 A ± 5%.
Remove the short from the output terminals.

f. Repeat steps (d) and (e) for -20 V output.

. Adjust the +20V output to 20 volts. Then push -20V

METER switch and check the effect of the Trackin
Ratio control on the volta
20V output should be adjustable from less than 0.5
volts to a maximum of 19 to 21 volts.

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.

+6V VOLTAGE control over its range

and the ammeter indicates zero.

clockwise to the Fixed position.

±20V VOLTAGE control

e and check that the voltmeter

and the ammeter indi-

e of the -20V output. The -

, and adjustment pro-

OPERA TION

This power supply can be operated individually or in parallel
or series with another suppl
tion para

round. The ±20V and +6V outputs use a single common out­put terminal. This common (COM) terminal or an
other output terminals ma
front panel
be left floating. Loads can be connected separately between
each of the 0 to ±20V output terminals and the COM terminal,
or between the -20V and the +20V terminals for a 0 to 40V
output. Each output volta
for monitorin

raphs). All output terminals are isolated from

round terminal ( in Figure 2), or all outputs ma

with the push-button meter switches. To moni-

(see Parallel and Series Opera-

one of the

be grounded to the chassis at the

e or current can be quickly selected

tor the 0 to 40V output volta
the +20V and -20V output and use either the +20V or the ­20V meter to measure the current.

e, add the voltmeter readings of

Tracking Ratio Control

With the Tracking Ratio control in the Fixed position, the volt­a

e of the -20V supply tracks that of the +20V supply within
1% for convenience in var
needed b
anced positive and ne

Turn the Trackin
Fixed position to set the volta
that of the +20V suppl
a minimum of less than 0.5 volts to a maximum within 5% of
the +20V suppl
control still controls both outputs and maintains a constant
ratio between their volta

operational amplifiers and other circuits using bal-

ative inputs.

Ratio control counter clockwise out of the

. The negative supply can be set from

's output. Once this is done, the ±20V voltage

the symmetrical voltages

e of the -20V supply lower than

es.

Overload Protection Circuits

±20-Volt Current Limit.

protected against overload or short circuit damage b

viduall
separate current limit circuits to limit the output current to 0.55
A ± 5%. (This is 110% of the maximum rated output.) If a sin-

le load is connected between the +20V and -20V outputs,
the circuit set for the lesser current limit will limit the output.
No deterioration of suppl
current remains below the current limit settin

+6V Current Foldback.

tection circuit for the +6V output reduces the output current
limit as the output terminal volta
region of the +6V output is enclosed by heavy lines in Figure

4.) The maximum rated output current is 2.5 A and the current
limit is factor
output is 6 volts. At lower output volta
the maximum obtainable output current linearl
15% flows when the output is shorted. The short-circuit cur­rent can not be adjusted.

-adjusted to operate at 2.75 A ± 5% when the

During the actual operation of the ±20V and +6V outputs, if a
load chan
LED is li

e causes the current limit to be exceeded, the OL

hted. If overload conditions occur, the ± 20V supplies
will protect the load b
+6V suppl

will protect the load by reducing both voltage and
current simultaneousl
Fi

ure 4. The ±20V and +6V supplies are self restoring; that

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

e is automatically restored to the previously set value.

volta

The +20V and -20V outputs are indi-

performance occurs if the output

.

The overload and short-circuit pro-

e decreases. (The operatin

es, the circuit reduces

until 1 A ±

limiting the current to 0.55 A and the

along the foldback locus as shown in

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

uaranteed to meet specifications in

e to the supply, but

1-7

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necessar

to fulfill the total current demand.

Series Operation

Series operation of two or more power supplies can be
accomplished up to the output isolation ratin

to obtain a higher voltage than that available from a single

pl
suppl

. Series connected supplies can be operated with one

load across both supplies or with a separate load for each

. The power supply has a reverse polarity diode con-

suppl
nected across the output terminals so that if operated in
series with other supplies, dama
short-circuited or if one suppl
series partners. When this connection is used, the output volt­a

e is the sum of the voltages of the individual supplies. Each
of the individual supplies must be adjusted in order to obtain
the total output volta

e.

e will not occur if the load is

is turned on separately from its

of any one sup-

LOAD CONSIDERATIONS

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

Figure 3. Current Limit Characteristic of the 6V Suppl

this region. If the line voltage is maintained in the upper end
of the input volta
operate within its specifications

e range, however, the supply probably will

Connecting Load

Each load should be connected to the power supply output
terminals usin
minimize mutual couplin
advanta
wires must be of adequatel

regulation at the load.

factor

Each pair of connectin
and twisted or shielded to reduce noise pick-up. If a shield is
used, connect one end to the suppl
leave the other end unconnected.

If load considerations require locatin
tion terminals at a distance from the power suppl
power suppl
remote distribution terminals b
wires and each load should be connected to the remote distri­bution terminals separatel

separate pairs of connecting wires. This will

effects between loads and takes full

e of the low output impedance of the supply. Load

heavy gauge to maintain satis-

wires should be as short as possible

round terminal and

output power distribu-

, then the

output terminals should be connected to the

a pair of twisted or shielded

.

Parallel Operation

Two or more supplies can be connected in parallel to obtain a
total output current

. The total output current is the sum of the output currents

pl
of the individual supplies. The output volta
power suppl
the other suppl

set to the lower output voltage will act as a constant

suppl
volta

e source, while the supply set to the higher output will
act as a current-limited source, droppin
until it equals that of the other suppl
source will deliver onl

reater than that available from one sup-

e controls of one

should be set to the desired output voltage, and

set for a slightly larger output voltage. The

its output voltage

. The constant voltage

that fraction of its rated output current

PULSE LOADING

The power supply will automatically cross over from constant­volta

e to current-limit operation in response to an increase in
the output current over the preset limit. Althou
limit ma
peak currents (as occur in pulse loadin
preset current limit and cause crossover to occur and
de

be set higher than the average output current, high

rade performance.

h the preset

) 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 exter­nall

will improve the pulse current capability, but will
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

1-8

Figure 4. Reverse Current Loading Solution

1-9

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Manual Update

The information in this manual update is provided to correct manual errors and to adapt the manual
to instruments containing changes after the manual print date.

Manual Identification

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

Bench DC Power supply

For Instruments with Serial Numbers > KR71810198

Change 1:

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

; Manual Part Number: 5959-5329, Manual Print Date: August 1999 (Edition 6)

E3630A Triple Output Lab

.

Ó

Copyright Hewlett-Packard Company 1999

Printed in Korea August 1999 E0899

*E3630-90092*

E3630-90092