HP 6236A, 6237A Operating And Service Manual

HP Archive

This vintage Hewlett Packard document was

preserved and distributed by

www.hparchive.com

Please

visit

us

on the web !

Scanned by on-line curator: Tony Gerbic

** For FREE Distribution Only ***

HP

Part No. 5950-1737

TRIPLE

OUTPUT

POWER

SUPPLY

MODELS

6236A

AND

6237

A

OPERATING

AND

SERVICE

MANUAL

FOR;

MODEL 6236A, SERIALS 1507A-00141

AND

ABOVE

MODEL 6237A, SERIALS 1507A-00101

AND

ABOVE

*

For Serials above 1507A-00141or1507A-00101,

a change page may be included.

Hewlett-Packard

Printed: February 1975

tions

in additiolatothe

standard

104-127Vac

47-63Hz

unit

andisfurnished

withapermanently

attached

5-foot

3-wire

grounding-type

line

cord.

1-8 SPECIFICATIONS

1-9

Table

1-1

lists

detailed

specifications

for

the

power

supply.

SECTION I

GENERAL

INFORMATION

I

INTRODUCTION

1-1

1-2 This manual covers

two

triple

output

power

supply

models,

the

6236A

and

the

6237

A. Both models are

com-

pact

general

purpose

bench

supplies

that

are

particularly

useful for

powering

developmentalICcircuits,

both

linear

and

digital. Unless

one

modelorthe

otherisspecifically

identified,

all

informationinthis

manual appliestoboth

the

6236A

and

the

6237

A.

1-10 OPTIONS

---

CAUTION

---

Carefully read SectionsIIand

IIIofthis

manual before

attempting

to operate the

power

supply.

1-11

Options

are

factory

modificationsofa

standard

instrument

that

are

requestedbythe

customer.

The

follow-

ing

options

are available

for

the

instrument

coveredbythis

manual.

OPTION NO.

OESCR

IPTION

---CAUTION---

1-13 ACCESSORIES

The

user can

convertaninstrument

from

one

line voltage

optiontoanother

by following

the

instructionsinPara-

graph 3-4.

1-12 Before

the

supplyisshipped

from

the

factory,

an

internal line voltage

selector

switchisset

and

the

proper

fuse installed

for

the

line voltage specifiedonthe

order.

A

label

on

the

rear

heat

sink identifies this line voltage

option.

Input

Power:

87-106Vac,47-63Hz,
single-phase.
Input

Power:

191-233Vac,47-63Hz,
single-phase.
Input

Power:

208-250Vac,

47-63Hz,

single-phase.

220

240

100

Before

applying

powertothe supply, make cer-

tain

that

its line voltage selector switch (S3)

is

set

for

the line voltage to be

used.

(See

CA UTION

notice

in Paragraph 3-2

for

additional

information

on S3).

1-5

All

controls,

meters,

and

output

terminals

are loca-

tedonthe

front

panel.

Two

single-turn

potentiometers

con-

trol

the

+6V

(or

+18V)

and

±20V

outputs.Athree-position

meter

switch selects

oneofthe

supplies for displayofits

voltage

and

currentontwo

dual-range meters.

The

+6V

(or +18V)

and

±20V

outputs

share a

common

output

ter-

minal which

is

isolated

from

chassis

ground.

1-3 DESCRIPTION

1-4 Both models have a dual

outputof0to±20

volts

at0to

0.5amps.

The

voltagesofthe

two

20-volt

outputs

are

adjusted

by asingle

front-panel

control

and

track

one

another

within1%.

The

+20V

and

-20V

outputs

can

also be

used

in

series for a single 0to40V

0.5A

output.

The

third

output

differsinthe

two

models

andis0to+6 voltsatup

to

2.5ampsinthe

6236A

and0to

+18

voltsat0to1

amp

in

the

6237

A /

1-6

All

outputs

are

protected

against

overloadorshort-

circuit

damage.

The

+18V

outputinthe

6237Aand

the

±20V

outputsinboth

models are

protectedbycircuits

which limit

output

currentto110%ofits nominal

maximum.

The overload

protection

circuit

for

the

+6V

outputinthe

6236A

has a

current

foldback

characteristic

which

reduces

the

output

current

as an overload increases until only 1A

flows

throughashort

circuit.

For

this

output,

the

current

limit

dependsonthe

output

terminal

voltage

and

varies

linearly

between

2.75Aat6V

and1Aat

zero

volts.

1-7 The

instrumentisavailableinthree

line voltage op-

1-14

The

accessories listed

below

maybeordered

from

your

local

Hewlett-Packard

field sales

office

either

1-1

with

the

power

supplyorseparately.

(Refertothe

list

at

the

rearofthe

manual

for

addresses.)

HP

PART

NO.

14513A

14523A

DESCRIPTION

Rack

Mounting

Kit

for

mounting

one

3

1/2"

high

supply

in a

standard

19"

relay rack.

Rack

Mounting

Kit

for

mounting

two

3

1/2"

high

supplies

sidebysideina

standard

19"

relay rack.

ture.

The

first

two

digits

indicate

the

year

(10=1970,

11

=

1971,

etc.)

the

second

two

digits

indicate

the

week,

and

the

letter"

A"

designates

the

U.S.A. as

the

countryofmanufac-

ture.

The

second

partisthe

power

supply

serial

number;

a

different

sequential

numberisassignedtoeach

power

sup-

ply,

starting

with

001

01.

1-17

If

the

serial

numberonyour

instrument

does

not

agree

with

thoseonthe

title

pageofthe

manual,

Change

Sheets

supplied

with

the

manualorManual Backdating

Changes

define

the

difference

between

your

instrument

and

the

instrument

describedbythis

manual.

1-15

INSTRUMENT AND

MANUAL

IDENTIFICATION

1-18 ORDERING

ADDITIONAL

MANUALS

1-16

Hewlett-Packard

power

supplies

are

identifiedbya

two

part

serial

number.

The

first

partisthe

serial

number

prefic, a

number-letter

combination

that

denotes

the

date

ofasignificant

design

change

and

the

countryofmanufac-

1-19

One

manualisshipped

with

each

power

supply.

Additional

manuals

maybepurchased

from

your

local Hew--

lett-Packard field

office

(see

the

listatthe

rearofthis

manual

for

addresses).

Specify

the

model

number,

serial

number

prefix,

and

theHPPart

number

providedonthe

title

page.

NOTE

Table

1-1.

Specifications,

Models

6236A

and

6237

A

TRACKING:

The

+20V

and

-20V

outputs

track

within1%.

Specifications

applytoboth

models

unless otherwise indicated.

INPUT POWER:

Standard

Option:

104:127Vac

(120Vac

nominal),

47-

63Hz,

single-phase, 112W,

140VA

(Other

line voltage

options

are listed in Paragraph 1-11.)

DC

OUTPUT

AND

OVERLOAD

PROTECTION:

o

to

±20V

Outputs:

Maximum

rated

output

current

is

0.5A.

Short

circuit

output

currentis0.55A

±5%

and

a

fixed

current

limit

circuit

limits

the

outputofeach

sup-

ply

to

this

maximumatany

output

voltage

setting.

Unbal-

anced

loads

within

current

rating are

permitted.

Model

6236A

o

to

+6V

Output:

Maximum

rated

output

currentis2.5A

at

6V.

The

maximum

available

output

current

decreases

with

the

output

voltage

setting.Acurrent

foldback

current

limits

the

outputto2.75A

±5%at6 volts and,

with

decreasing

voltage,

reduces

the

current

limit

linearlyto1A ±15%atzero

volts

(short

circuited).

Model

6237A

o

to

+18V

Output:

Maximum

rated

output

current

is

1.0A.

Short

circuit

output

currentis1.1 A ±5%

andafixed

current

limit

circuit

limits

the

outputtothis

maximum

at

any

output

voltage

setting.

1-2

LOAD

EFFECT

(Load

Regulation):

All

Outputs:

Less

than

0.01 % plus

2mV

for

a full

load

tonoload

changeinoutput

current.

SOURCE

EFFECT

(Line

Regulation):

All

Outputs:

Less

than

0.01%

plus

2mV

for

any

line

voltage

change

within

rating.

PARD

(Ripple

and

Noise):

All

Outputs:

Less

than

0.35mV

rms

and

1.5mV

p-p

(20

Hito20

MHz).

DRIFT

(Stability):

All

Outputs:

Less

than

0.1 % plus

5mV(0to20Hz)

during8hoursatconstant

line,

load,

and

ambient

after

an

initial

warm-up

timeof30

minutes.

LOAD

TRANSIENT

RECOVERY

TIME:

All

Outputs:

Less

than

50psec

for

output

recovery

to

within

15mVofnominal

output

voltage

following

a load

change

from

full

loadtohalf load (or vice versa).

OUTPUT

VOLTAGE

OVERSHOOT:

All

Outputs:

During

turn-onorturn-offofac

power,

output

plus

overshoot

will

not

exceed

1V if

the

output

controlisset

for

less

than1V.Ifthe

controlisset

for

1V

or

higher,

thereisno

overshoot.

Table 1-1. Specifications, Models

6236A

and

6237A

(Continued)

TEMPERATURE

COEFFICIENT:

All

Outputs:

Less

than 0.02% plus 1mVvoltage change

per degree Celsius over the operating

range

from0to

40°C

after 30 minutes warm-up.

*OUTPUT

IMPEDANCE

(typical):

o

to

+20V

Output:

0.5mn

plus 1.5/lH

o

to

-20V

Output:

0.5mn

plus 1.5/lH

Model

6236A

o

to

+6V

Output:

0.3mn

plus 1/lH

Model

6237A

o

to

+18V

Output:

0.3n

plus 1.5/lH

* Operating characteristics listed

as

typical

are

provided

for

the user's

information

only

and

are

not

warranteed specifi-

cations.

RESOLUTION:

(Minimum

output

voltage change obtainable using

front

panel voltage

control)

o

to

±20V

Outputs: 70mV

Model

6236A

o

to

+6V

Output:

20mV

Model

6237A

o

to

+18V

Output:

70mV

1-3

TEMPERATURE

RANGES:

Operating: 0

to

+40°C ambient.Athigher temperatures,

output

currentisderated linearlyto50%

at 55°C.

Storage:

-40°Cto

+75°

C.

METER RANGES:

o

to

+20V

Output:

0-25V,O-0.6A

o

to

-20V

Output:

0-25V,O-0.6A

Model

6236A

o

to

+6V

Output:

0-7V,

0-3A

Model

6237A

o

to

+18V

Output:

0-21

V, 0-1.2A

METER

ACCURACY:

±4%offull

scale

DIMENSIONS:

3

15/32

H x

87/32

W x

129/16

D

(88mm H

x 208mm W x 319mm D)

WEIGHT:

9.5 Ib (4.3kg)

SECTION II

INSTALLATION

2-1

INITIAL

INSPECTION

2-2 Before

shipment,

this

instrument

was

inspected

and

foundtobe freeofmechanical

and

electrical

defects.

As

soonasthe

instrumentisunpacked,

inspect

for

any

damage

that

may

have

occurredintransit.

Save all

packing

materials

until

the

inspectioniscompleted.Ifdamageisfound,

file

claim

with

carrier

immediately.

The

Hewlett-Packard

Sales

and

Service

office

shouldbenotifiedassoon

as possible.

2-3 Mechanical Check

2-4 This

check

should

confirm

that

there

arenobroken

knobsorconnectors,

that

the

cabinet

and

panel surfaces are

free

of

dents

and

scratches,

and

that

the

meterisnot

scratch-

edorcracked.

NOTE:

ACCESSORY

KITS

FOR19INCH

RACK

IIOUNTIIG

AIlE:

HI'

IIOOEL

1451~

FOR

CIlE

SUI'l\.Y

HP

lOlELl4523A RJlTlI09..PPL£S

$10£

VIEW

2-5 Electrical Check

Figure 2-1. Outline Diagram

2-6

The

instrument

shouldbechecked

against

its elec-

trical

specifications.

Section

V includes an

"in-cabinet"

per-

formance

checktoverify

proper

instrument

operation.

2-7

INSTALLATION

DATA

2-8

The

instrumentisshipped

ready

for

bench

opera-

tion.

Before

applying

powertothe

instrument,

see

the

CAUTION

notice

in Paragraph 3-2.

2-9 Location

2-11

Outline Diagram

2-12

Figure

2-1

illustrates

the

outline

shape

and

dimen-

sionsofthis

supply.

Figure 2-2. Rack

Mounting,

One

Unit

Figure 2-3. Rack

Mounting,

Two

Units

Rack Mounting

2-10

This

instrumentisair

cooled.

Sufficient

space

shouldbeallottedsothat

a free

flowofcooling

air

can

reach

the

rearofthe

instrument

whenitisinoperation.

It

shouldbeusedinan

area

where

the

ambient

temperature

does

not

exceed

40°C

(upto55°C

with

derating).

2-13

2-14

This

instrument

mayberack

mountedina

standard

19-inch

rack

panel

either

by itselforalongside a similar

unit.

Figures 2-2

and

2-3

show

the

componentsofthe

rack

mount-

ing kits available

for

this

power

supply.

Ordering

informa-

tion

for

rack

mounting

accessoriesisgiven in Paragraph 1-13.

2-1

2-15

Input

Power Requirements

2-16 Dependingonthe

line voltage

option

ordered,

the

supplyisreadytobe

operated

from

oneofthe

power

sources

listed in

Table

2-1.

The

input

voltage range,

and

the

input

current

and

powerathigh line voltage

and

full loadislisted

for

each

option.

A labelonthe

rear

heat

sink

identifies

the

line voltage

optionofyour

supply.

All

optionsofthis

model

operate

froma47-63Hzsingle-phase line.

2-17

If

desired,

the

user

can

easily

convert

the

unit

from

anyofthese

optionstoanother

by following

the

instructions

in Paragraph 3-4. A

unitisconvertedbyresetting

an internal

line voltage

selector

switch,

replacing

the

fuse,

and

changing

the

line voltage tag.

2-20

To

preserve

the

protection

feature

when

operating

the

instrument

fromatwo-contact

outlet,

use a

three-prong

to

two-prong

adapter

(if

permitted

by local regulations) and

connect

the

green leadonthe

adaptertoground.

2-21 Model

6236A

and

6237

A supplies are

equipped

at

the

factory

withapower

cord

plug

appropriate

for

the

user's

location.

Figure 2-4 illustrates

the

standard

configu-

rations

of

power

cord

plugs used by HP. Above each draw-

ing

is

theHPoption

number

for

that

configurationofpower

connector

pins. Below each drawingistheHPpart

number

for a

replacement

power

cord

equipped

with

a plugofthat

configuration.

Notify

the

nearest

HP Sales

and

Service

Office if

the

appropriate

power

cordisnot

included

with

the

instru

ment.

2-22 Repackaging

for

Shipment

--

CAUTION

--

If

the

supply

might

possibly have been

converted

to a line voltage

option

other

than the one

marked

on its

identifying

label

without

being relabeledinsome way,

check the setting

of

the line voltage selector

switch

and

the fuse rating before

applying

power.

(See

CAUTIONinParagraph 3-2)

2-23

To

insure safe

shipmentofthe

instrument,itis

recommended

that

the

package designed

for

the

instrument

be used.

The

original packaging materialisreusable. If it

is

not

available,

contact

your

local Hewlett-Packard field

office

to

obtain

the

materials. This office will also furnish

the

addressofthe

nearest

service officetowhich

the

instru-

ment

canbeshipped

and

provide

the

Authorized

Return

label necessarytoexpedite

the

handlingofyour

instrument

return.Besuretoattach

a tagtothe

instrument

which

specifies

the

owner,

model

number,

full serial

number,

and

service

required,ora brief

descriptionofthe

trouble.

2-18 Power Cable

8120-0050

OPTION

903

8120-1691

OPTION

902

8120-1369

OPTION

901

Figure 2-4.

Power

Cord

Configurations

8120-1351

OPTION

900

2-19

To

protect

operating

personnel,

the

National

Electrical

Manufacturers

Association (NEMA)

recommends

that

the

instrument

panel

and

cabinetbegrounded.

"This

instrumentisequipped

withathree

conductor

power

cable.

The

third

conductoristhe

ground

conductor

and

when

the

cableisplugged

intoanappropriate

receptacle,

the

instru-

mentisgrounded.

The

offset

pinonthe

power

cable

three-

prong

connectoristhe

ground

connection.

Innoevent

shall

this

instrumentbeoperated

withoutanadequate

cabi

net

ground

connection.

Table

2-1.

Input

Power

Requirements

Option

Line Voltage Range

Input

Current

Input

Power

100

(100

Vac)

87-106

Vac

1.3A

140

VA

Standard

(120

Vac)

104-127

Vac

1.1A

140

VA

220

(220

Vac)

191-233

Vac

0.6A

140

VA

240

(240

Vac)

208-250

Vac

0.55A

140

VA

2-2

SECTION

III

OPERATING INSTRUCTIONS

3-1

m

=~=::

OU~https://manualmachine.com/~~2~:

"If"

_---

........

1

Figure 3-1. Controls and Indicators

TURN-ON CHECKOUT PROCEDURE

a.

Connect

line

cordtopower

source

and

turn

LINE

switch

G)

on.

LINE ON

indicator

® will light.

b.

Set

METER

switch

®

to

the

+6V

position

and,

with

no

load

connected,

vary

+6V

VOLTAGE-control

@ over

its range

and

check

that

the

voltmeter

respondstothe

con-

trol

setting

and

the

ammeter

indicates

zero.

c.

Set

the

+6V

VOLTAG E

control

fora6-volt

meter

indication

and

short

the

+6V

output

terminaltoCOM

(common)

terminal

®

withaninsulated

test

lead.

The

ammeter

should

indicateashort-circuit

output

current

of

approximately

1.0A

(1.1Ainthe

6237A).

Remove

the

short

from

the

output

terminals.

d.

Set

the

METER

switchtothe

+20V

position

and,

withnoload

connected,

vary

±20V

VOLTAGE

control

®

over its range

and

check

that

the

voltmeter

respondstothe

control

setting

and

the

ammeter

indicates

zero.

3-2

The

following

steps

describe

the

useofthe

Model

6236Aor6237Afront

panel

controls

and

indicators

illus-

trated

in Figure 3-1

and

serve as a

brief

check

that

the

sup-

plyisoperational.

This

checkout

procedureorthe

more

detailed

performance

testofParagraph 5-6

should

be follow-

ed

when

the

instrumentisreceived

and

beforeitis

connect-

edtoany

load

equipment.

Proceedtothe

more

detailed

procedures

beginning in Paragraph 5-6 if

any

difficulties

are

encountered.

--

CAUTION--

e.

Set

the

±20V

VOLTAGE

control

fora20-volt

meter

indication

and

short

the

+20V

output

terminaltothe

com-

mon

terminal

withaninsulated

test

lead.

The

ammeter

should

indicateashort-circuit

output

currentofO.55A

±5%.

Remove

the

short

from

the

output

terminals.

f.

Repeat

steps

(d)

and

(e),

but

substitute

the

-20V

positionofthe

METER

switch

and

the

-20V

output

ter-

minal.

Figure 3-2. Line Voltage Selector (Set for

120

Vac)

Before applying power to the supply, make certain
that its line voltage selector switch

(53)

is

set

for

the line voltage to be used. This switch

is

mounted

on the circuit board behind the voltmeter and

is
visible through the perforations in the top cover.
The positions

of

the two white marks on the switch

indicate the switch setting

(see

Figure 3-2).Ifthe

switch setting does

not

correspond to the intended

power source, proceed to

Paragraph

3-4 before

applying power.

.r--

240----,

(

r-

220

----,

0_

0

L-,OO--.J

'---120

---J

t

FRONT

OF

SUPPLY

NOTE

For the Model 6237A, substitute. +18V

for +6V in the following steps.

3-1

3-3

If

this

brief

checkout

procedureorlater

useofthe

supply

reveals a possible

malfunction,

see

SectionVof

this

manual

for

detailed

test,

troubleshooting,

and

adjustment

procedures.

3-4

LINE

VOLTAGE

OPTION CONVERSION

3-5

To

convert

the

supply

from

one

line voltage

option

to

another,

the

following

three

steps

are necessary:

1.

After

making

certain

that

the

line

cordisdiscon-

nected

fromasourceofpower,

remove

the

top

cover

from

the

supply

and.

set

the

two

sectionsofthe

li:1e

voltage selec-

tor

switch

for

the

desired

line voltage (see Figure 3-2),

2.

Check

the

ratingofthe

installed fuse

and

replace

it

with

the

correct

value, if necessary.

For

Options

100

or

120,

use a

normal

time-constant

2-amp

fuse (HP

Part

No.

2110-0002);

for

Options

220or240,

use a

normal

time-

constant

1-amp

fuse (HP

Part

No.

2110-0001).

3. Mark

the

instrument

clearly

withatagorlabel

indicating

the

correct

line voltagetobe used.

3-6

OPERATION

3-7 This

power

supply

canbeoperated

individually

or

in parallel

with

another

supply

(see Paragraph

3-17).

All

output

terminals

are

isolated

from

ground.

The

±20V

and

+6Vor+18V

outputs

use a single

common

output

terminal.

This

common

(COM)

terminaloranyoneofthe

other

output

terminals

maybegroundedtothe

chassisatthe

front

panel

ground

terminal

(

G)

in Figure

3-1),orall

outputs

may

be

left

floating. Loads can be

connected

separately

between

eachofthe0to

20V

output

terminals

and

the

COM ter-

minal,

or

between

the

-20V

and

the

+20V

terminals

for

a

o

to

40V

output.

3-8 Overload Protection Circuits

3-9

±20-Volt

Current

Limit.

The

+20V

and

-20V

outputs

are individually

protected

against

overloadorshort-

circuit

damagebyseparate

current

limit

circuits

which

are

adjustedatthe

factorytolimit

the

output

currentto0.55A

±5%. (Thisis110%ofthe

rated

maximum

outputof0.5A.)

The

current

limits can be

setbyadjusting

resistor R6

for

the

+20V

output

and

R26

for

the

-20V

output.

(See Paragraph

5-47

for

current

limit

calibration

instructions.)

No

deteri-

orationofsupply

performance

occursifthe

output

current

remains

below

the

current

limit

setting.

If a single load

is

connected

between

the

+20V

and

-20V

outputs,

the

circuit

set

for

the

lesser

current

limit

will

limit

the

output.

3-10

+6V

Current

Foldback

(Model

6236A).

The

over-

load

and

short-circuit

protection

circuit

for

the

+6V

output

of

the

Model

6236A

reduces

the

output

current

limitasthe

output

terminal

voltage decreases.

(The

operating

region

of

the

+6V

outputisenclosedbyheavy lines in Figure 3-3).

The

maximum

rated

output

currentis2.5A

and

the

current

limitisfactory-adjustedtooperateat2.75A

±5%

when

the

3-2

outputis6 volts.

At

lower

output

voltages,

the

circuit

reduces

the

maximum

obtainable

output

current

linearly

until 1A

±15%

flows vvhen

the

outputisshorted.

The

short-

circuit

current

cannotbeadjusted,

but

R46

canbeset

to

limit

the

maximum

currentat6Vto2.75A

±5%. (See Para-

graph

5-47

for

current

limit

calibration

instructions.)

3-11

+18-Volt

Current

Limit

(Model

6237

A).

The

+18-

volt

outputofthe

Model

6237Ais

protectedbya

fixed

cur-

rent

limit

circuit

which

operatesat1.1 A

(110%ofits max-

imum

rated

outputof1.0A).

The

circuitissimilartothe

onesinthe

±20-volt

supplies. (See Paragraph 5-47

for

cal ibrationi

nstructi

ons.)

3-12 Operation Beyond Rated

Output

3-13

The

supply

maybeabletoprovide

voltages

and

currents

greater

than

its

rated

maximum

outputsifthe

line

voltage

isator

above

its

nominal

value.

Operation

can

ex-

tend

into

the

shaded

areasonthe

meter

faces

without

dam-

agetothe

supply,

but

performance

cannotbeguaranteed

to

meet

specifications.Ifthe

line voltageismaintainedinthe

upper

endofthe

input

voltage range,

however,

the

supply

probably

will

operate

within

its

specifications.

3-14 Connecting Loads

3-15

Each

load

shouldbeconnectedtothe

power

supply

output

terminals

using

separate

pairsofconnecting

wires.

This

minimizes

mutual

coupling

between

loads

and

takes

full

advantageofthe

low

output

impedanceofthe

power

supply.

Connecting

wirestothe

load

mustbeof

adequately

heavy gagetomaintain

satisfactory

regulationatthe

load.

Each pair

of

connecting

wires

should

be as

short

as possible

and

twistedorshieldedtoreduce

noise

pickup.Ifshielded

wireisused,

connect

one

endofthe

shieldtothe

power

supply

ground

terminal

and

leave

the

other

end

unconnect-

ed.

3-16

If

load

considerations

require

that

the

output

power

distribution

terminalsberemotely

located

from

the

power

supply,

then

the

power

supply

output

terminals

should

be

connectedtothe

remote

distribution

terminalsbya

pair

of

twistedorshielded

wires

and

each

load

separately

connect-

edtothe

remote

distribution

terminals.

3-17 Parallel Operation

3-18

Twoormore

power

suppl

ies

canbeconnected

in

parallel

to

obtainatotal

output

current

greater

than

that

available

from

one

power

supply.

The

total

output

current

is

the

sumofthe

output

currentsofthe

individual

power

supplies.

The

output

voltage

controlsofone

power

supply

should

be

settothe

desired

output

voltage,

and

the

other

power

supply shouldbeset

for

a slightly larger

output

volt-

NOTE:

THE LOWER END - POINT

OF

THE

CURRENT

LIMIT

LINEISNOT

AD-

JUSTABLE;

THE UPPER END-POINT

IS SET AT THE FACTORY

FOR

2.75A

±

5%.

BETWEEN ITS

END-

POINTS,

THE ACTUAL CURRENT

LIMITISA

STRAIGHT-LINE FUNCTION.

OPERATING

REGION

+6V

SUPPLY,

MODEL

6236A

2V

IV

5V

~-----+------+------+------+---~~-,4

__

--------4

4V

~-----+------+-----+------+-~~-+-"---+-------4

3V

OUTPUT

TERMINAL

VOLTAGE

6V

OUTPUT

CURRENT (AMPERES)

o

0.5

t

1.0

\

0.85A

115A

SHORT

CIRCUIT CURRENT

MAY

VARY

±15%

FRav1

UNITTOUNIT.

1.5

2.0

2.5

3.0

Figure

3-3:

Current

Limit

Characteristicsofthe6VSupply

(Model

6236A)

3-21

Output

Capacitance.

An internal

capacitor

across

the

output

terminalsofthe

power

supply

helpstosupply

high-current

pulsesofshort

duration

during

constant

volt-

age

operation.

Any

capacitance

added

externally

will im-

prove

the

pulse

current

capability,

but

will decrease

the

load

protection

provided by

the

current

limiting circuit. A

3-20

Pulse Loading.

The

power

supply

will

automati-

cally cross over

from

constant

voltagetocurrent

limit

operationinresponsetoan increaseinthe

output

current

over

the

preset

limit.

Although

the

preset

limit

maybeset

higher

than

the

average

output

current,

high

peak

currents

as

occurinpulse loading

may

exceed

the

preset

current

limit

and cause crossover

to

occur

and

degrade

performance.

age.

The

supply

settothe

lower

output

voltage will

act

as

a

constant

voltage

source,

while

the

supply

settothe

higher

output

will

act

as a

current-limited

source,

dropping

its

out-

put

voltage untilitequals

thatofthe

other

supply.

The

constant

voltage

source

will deliver

only

that

fraction

of

its

total

rated

output

current

whichisnecessarytofulfill

the

total

current

demand.

3-19 Special Operating Considerations

high-current

output

pulse

may

damage load

components

before

the

average

output

currentislarge

enoughtocause

the

current

limiting

circuittooperate.

3-22

Reverse

Current

Loading. An active load

connect-

edtothe

power

supply

may

actually

deliver a reverse cur-

renttothe

power

supply

duringaportionofits

operating

cycle. An

external

source

cannot

be allowedtopump

cur-

rent

into

the

supply

without

lossofregulation

and

possible

damage

to

the

output

capacitor.Toavoid

these

effects,

it

is

necessarytopreload

the

supply

withadummy

load

resistor so

that

the

power

supply

delivers

current

through

the

entire

operating

cycleofthe

load device.

3-23

Reverse Voltage

Protection.

Internal

diodes

con-

nected

with

reverse

polarity

across

the

output

terminals

protect

the

output

electrolytic

capacitors

and

the

driver

transistors

from

the

effectsofa reverse voltage applied

across a

supply

output.

Since series

regulator

transistors

cannot

withstand

reverse voltage

either,

diodes

are also

connected

across

them.

When

operating

supplies in parallel,

these

diodes

protectanunenergized

supply

thatisin para-

llel

with

an energized

supply.

3-3

SECTION

IV

PRINCIPLES OF OPERATION

4-1

OVERALL

DESCRIPTION

4-2 This section presents

the

principlesofoperation

of

the

Models

6236A

and

6237

A Triple

Output

Power

Supply.

Throughout

this

section

refertothe

combined

schematic

diagram

of

Figure 7-1.

NOTE

All information in this section applies to

both

models unless otherwise indicated.

4-3 The

two

primary

windingsofthe

power

transformer

are

connectedinoneoffour

different

ways by setting

the

two

slide switches

mountedonthe

circuit

board. These

switches select

oneofthe

nominal ac

input

voltages

for

which

the

supplyisdesigned:

100V,

120V,

220V,or240V.

4-4 The

transformer

secondaries,

together

with

recti-

fiers

and

capacitor

filters, provide rawdcfor

the

three

out-

put

regulator circuits and for

another

regulator which pro-

vides reference and bias voltagestothe

output

regulators.

4-5

By

comparing

its

outputtoa high-stability refer-

ence,

the0to

+6-volt regulator (6236A)or0to+18-volt

regulator

(6237

A) holds its

output

voltageatthe

value

determined

by a

front

panel

control.

Any

errorinthe

actual

outputascomparedtothe

desired

output

is

am-

plified by an operational amplifier

and

applied as

fe~dback

to

control

the

conductionofa series

regulator

transistor.

As

a result,

the

voltage across

the

series

transistor

varies so

astohold

the

output

voltage

constantatthe

desired level.

The high gain

of

the

voltage

comparison

amplifier

and

the

stabilityofthe

reference voltage ensure

that

input

voltage

or load

current

variations have Iittle

effectonthe

output

voltage.

4-6

The0to

+6-volt

outputinthe

Model

6236A

is

protected

by a

current

foldback

limiter which minimizes

dissipation in

the

series regulator

transistor

during

overloads.

Inacurrent

foldback

circuit,

the

current

limit

depends

on

the

output

terminal voltage

and

in this

regulator

ranges

from 2.

75A

±5%at6 voltsto1A ±15%

with

the

output

short-

ed. (An

outputof2.

75Ais110%ofthe

rated

maximum

of

2.5Aat6 volts.)

The

operating regionofthe

+6-volt regu-

lator

outputisenclosed by a heavy lineinFigure 3-3.

If

the

operating

point

reaches

the

diagonal

current

limit line,

a decrease in load resistance moves

the

operating

point

4-1

down

the

line, reducing

the

output

voltage

and

current.

Current

foldbackiscontrolledbya

second

operational

amplifier in

the

regulator which

monitors

thedcoutput

current.

This

current

comparison

amplifier

takes

control

of

the

'output

away

from

the

voltage

comparison

amplifier

when

the

current

reaches

the

design limit. Removing

the

overload restores

constant

voltage

operation

automatically.

4-7

The

+20-volt regulator has a fixed

current

limit

at

110%ofits

0.5

amp

maximum

rated

output

butisotherwise

similartothe

+6-volt regulator.

4-8

The0to

-20-volt

regulator is,inturn,

similartothe

+20-volt regulator

except

that

it resembles a

complementary

mirror

imageofthe

latter.

The

output

voltagesofthe

+20-

volt

and

-20-volt

supplies are

both

setbythe

same

front

panel

control

and

track

each

other

within

1%. Precise track-

ing

of

the

two

outputsisachievedbycontrolling

the

positive

output

conventionally

and

using

that

outputasthe

reference

voltage

for

the

negative

output.

4-9

The0to

+18-volt regulator in

the

Model

6237

A

is

similartothe

+20-volt regulator. It has a fixed

current

limitat110%ofits

1.0

amp

output.

4-10

The

reference

and

bias

supply

provides reference

and

bias voltages

for

the

output

regulators.

4-11

The

turn-onlturn-off

control

circuit

prevents

out-

put

transients

when

the

supplyisturnedonor

off. It does

this by delaying

the

applicationofcertain

bias

and

reference

voltages

at

turn-on

and

removing

them

shortly

after

turn-off.

4-12

A

three-position

meter

switch selects whichofthe

supplies has its

output

voltage

and

current

indicatedonthe

front

panel meters.

The

proper

rangeofthe

dual-range

metersisselected

automatically.

4-13

DETAILED

CIRCUIT

DESCRIPTION

4-14 0 To

+20-Volt

Regulator

4-15

Voltage

Comparison

Amplifier.

The

voltage

com-

parison amplifier in

the

+20-volt

supply

controls

the

conduc-

tionofseries regulator

transistorQ1so

that

the

voltages

at

the

two

inputsofthe

amplifier remain equal. A fixed volt-

age divider holds its inverting

input

(U1-2)at-16mV.

Its

non-inverting

input

(U1-3)

monitors

the

output

voltage in

series

with

the

voltage across R1. Since R2isconnected

between

the

-6.2V

reference

supply

andapoint

which feed-

back

action

holds near

-16mV,

its

current

remains

constant.

This

current

flows

throughR1to

produce

a voltage

drop

acrossR1proportionaltoits resistance setting,

thus

the

output

voltageofthe

supplyisproportionaltothe

resistance

settingofR1.Atthe

outputofthe

voltage

comparison

amplifier (U1-1), a positive voltage change

correspondstoa

decrease in

the

conductionofQ1.

4-16

CR2

and

CR3

protect

the

inputofthe

amplifier

against

transient

overloads, C2

andR4speeduploop

re,.

sponse

time,

andC4and

R12 stabilize

the

supply's

high

frequency

characteristics.

4-17

OR-Gate.

To

permit

either

the

voltage

comparison

amplifierorthe

current

comparison

amplifiertocontrol

the

series regulator

transistor,

the

outputsofboth

amplifiers

are

connectedtothe

baseofdriverQ2through

an OR-gate

composedofCR5

and

CR6.

CR5isnormally reverse

biased by a negative

output

from

the

current

comparison

amplifier,

permitting

the

voltage

comparison

amplifier

to

driveQ2through

CR6. An overload drives

the

output

of

the

current

comparison

amplifier positive,

forward

biasing

CR5

and

reducing

the

supply

output.

When

the

overload

is

removed,

CR5isreverse biased again

and

the

voltage

com-

parison amplifier resumes

controlofthe

output.

4-18

Driver

and

Series Regulator.

The

-12.4Voutput

of

the

bias

supply

provides

the

turn-on

bias

for

series regu-

lator

transistor

Q1. Its

complete

current

path

includes

Q15,

CR59,

R14,

and

Q1,

and

returnstocommon

through

current

monitoring

resistor R8. (Itisbecause this bias

current

flows

throughR8that

the

output

ammeter

requires

the

zero

off-

set

bias

circuit

describedinparagraph 4-43.)

Through

the

OR-gate,

either

the

voltageorthe

current

comparison

ampli-

fier

controls

the

conductionofdriver Q2, which regulates

the

flowofturn-off

bias

through

Q1's

base-emitter

circuit.

The

algebraic sumofthe

nearly

constant

turn-on

bias

through

R14

and

the

variable

turn-off

bias

throughQ2controls

the

conductionofseries

regulator

transistor

Q1.

4-19

Current

limit

Circuit.Inthe

+20-volt regulator,

the

current

comparison

amplifier

compares

the

voltage

across

current

monitoring

resistor R8tothe

fixed voltage

across

partofcurrent

limit

adjust

potentiometer

R6.

The

current

limit

adjustmentissetsothat

the

input

voltage

to

the

current

comparison

amplifierisnegative in

the

normal

operating

region,

but

becomes zero

when

the

output

current

increasesto0.55

amps. When

the

amplifier's

input

voltage

reaches zero, it

takes

controlofthe

regulator

output

voltage

and

reduces it as necessarytokeep

the

output

current

from

exceeding

0.55

amps. When

the

overloadisremoved,

the

outputofthe

current

comparison

amplifier goes negative,

reverse biasing

CR5

and

returning

controltothe

voltage

4-2

comparison

amplifier.

4-20

Turn-On/Turn-Off

Control.

When

the

power

supply

is

turnedonor

off,

Q15inthe

turn-on

control

circuit

with-

holds

turn-on

bias

fromQ1while

the

regulator

bias voltages

are

too

low. This prevents an

output

voltage

transient

from

occurring before

the

amplifiers are

properly

biased.

The

outputofthe

-6.2V

reference

supplyisalso

temporarily

heldata low voltage by

Q14,

which

conductstoshort

that

output.

4-21 Circuit

Protection

Components.

Diodes CR1,

CR7,

and

CR9

each

protect

the

+20-volt

supply

from

spe-

cific hazards.

Output

diode

CR1

protects

the

supply

com-

ponents

if a reverse voltageisappliedtothe

output

terminals.

A

common

way

for

thistooccurisfor

an unenergized

supply

tobeconnectedinseries

with

another

thatisenergized.

If

the

output

voltageisturned

down

quickly

while a large

capacitorisconnected

across

the

output,

CR7

protects

driverQ2from

excessive dissipationbyshunting

someofits

base

currenttocommon.

The

series

regulator

diode,

CR9

protects

the

series regulator

transistor

from

reverse voltage.

Series regulator voltage

could

occur

if a deenergized sup-

ply were

connectedinparallel

with

an energized one.

4-22 0 To

-20-Volt

Regulator

4-23 Insteadofusing an

NPN

driver

and

a

PNP

series

regulator in

the

negative

output

line asinthe

+20-volt regu-

lator,

the

-20-volt

regulator uses a

PNP

driver

and

an

NPN

series regulator in

the

positive

output

line.

The

-20-volt

regulator

circuitisthe

complementary

equivalentofthe

+20-volt

circuitinother

respects, as well.

Their

current

limit

circuits

operate

similarly.Atthe

outputsofthe

current

and

voltage

comparison

amplifiers in

the

-20-volt

circuit, a neg-

ative voltage change

correspondstoa decreaseinseries regu-

lator

conduction.

The

turn-on

bias

for

its series regulator

transistor,

Q3,issupplied

from

a positive voltage source,

the

+7.5V bias

supply,

andisswitchedonand

offbyQ13

in

the

turn-on

control

circuit.

4-24

The

-20-volt

supply

uses

the

outputofthe

+20-volt

supply

as

its reference voltage. As a result,

both

outputs

are

set

by a single

front

panel

control

and

track

each

other

with-

in

1%.Two

resistorsinresistor

networkZ1are

connected

in

series

between

the

+20-volt

and

-20-volt

outputs.

These

resistors are closely

matchedinresistance

and

temperature

coefficientsothat

the

voltage across eachisexactly

half

of

the

total.

The

midpointofthis dividerisconnectedtothe

non-inverting

inputofthe

-20-volt

supply's

voltage com-

parison amplifier.

The

amplifier's inverting

inputisconnect-

edtocommon

through

R32tohold itatzero volts.

The

amplifier keeps its differential

input

voltageatzerobymatch-

ing

the

output

voltageofthe

-20-volt

supplytothatofthe

+20-volt

supply.

4-25 0 To +6-Volt Regulator (Model 6236A)

4-26 Except

for

differing

component

designations and

values, paragraphs

4-15

through

4-18,4-20,

and 4-21,

which

describe the voltage comparison

amplifier,

OR-gate, driver,

series regulator,

turn-on

control,

and

circuit

protection

componentsofthe

+20-volt

regulator

circuit,

also apply

to

the

+6-volt

regulator. The

only

difference in

circuit

opera-

tion

lies in the

controlofthe

current

comparison

amplifier,

and thus the

typeofcurrent

limit

the

supply

has.

4-27

Current

Foldback

Circuit.

(For

this discussion refer

to

the Figure

7-1

schematic andtoFigure 4-1.) The

differ-

ential

input

signaltothe

current

comparison

amplifieristhe

algebraic sum

of

three

circuit

voltages:

1.

The voltage across R49. ER49 remains constant

at

-305mV.

2.

The voltage across the

lower

partofR46

(see

Figure

4-1). E

R46

is

proportionaltothe regulator

output

voltage and equals

440mV

when the supply

output

is

6 volts.

3. The voltage across

current

monitoring

resistor R48.

E

R48

is

proportionaltothe sumofthe regulator

output

current

and the

0.22A

bias

current

that

flows

through

R54 and R48.

-12.4V

Z1

- 1

-305mV

30K

g~~~~~TSON

~t---_5"-i+

AMPLIFIER

put.

When this happens, the

outputofthis

amplifier

goes

positive and

forward

biases CR45. Since the

current

through

CR45

tendstoreduce the

outputofthe supply, the

output

of

the voltage comparison

amplifier

goes

negative in oppo-

sition

to

this change and reverse

biases

CR46toleave the

current

comparison

amplifierincontrolofthe

output.

Now

that

the

current

comparison

amplifierisin

control

and

for

as

longasthe overload remains, the supply's

output

voltage

and

current

varysoastomaintain this

amplifier's

differen-

tial

input

signal near zero volts. This results in the

output

current

limit

characteristics shown in Figure 3-3.

4-29

Ifweassume

for

example

that

the voltage

control

is

set

for

5 volts and the load resistanceisslowly

decreased,

the supply

goes

into

current

limitatabout

2.47 amps. Here

is

whyitoccurs at

that

value.Ata

5-volt

supply

output,

E

R46

is

5/6of440mV,or367mV.

In order

for

the algebraic

sum

of

E

R46

and E

R48

togoas

far

negativeas-305m

V and

drive the

amplifier

output

positive, E

R48

must reach

-672mV.

Once E

R48

reaches this value, the

current

com-

parison

amplifier

controls the series regulator transistor

so

astoprevent ER48 (and thus the supply's

output

current)

from

increasing

further.

At

0.25

ohms, R48 develops

-672mVat2.69 amps. Since 0.22 ampsofthe

current

through

R48isbias

current

for

Q7, the nominal

current

limit

correspondingtoa 5-volt

outputis2.69 amps minus

0.22

amps,orabout

2.47 amps.

4-30

If

the load resistance continuestodecrease,itpulls

the

output

voltage lower. This reduces E

R46

until

at a zero

output

voltage ER46 becomes zero, leaving ER48 equal in

magnitude

to

E

R49

. This

-305mV

drop

across

R48

corre-

sponds

to

a 1.22-amp

current

through

R48 and a 1-amp short-

circuit

currentatthe

outputofthe supply.

CR45

U3

CR44

+--looT

6

R49

750

+

R47

23K

R48

_

0.25

+

R46

3K

CURRENT

+}

LIMIT _ E

R46

ADJ.

+--

lOUT

+0.22A07BIAS

0.22A07BIAS

Figure 4-1. Foldback

Current

Limit

Circuitin6V

Supply

4-31 In the

+6-volt

regulator,asin the

+20-volt

regulator,

the

turn-on

bias

current

for

the series regulator transistor

is

switched on and

offbyQ15

in the

turn-on

control

circuit

to

prevent

output

voltage transients.

4-28 When the supply's

output

currentisbelow

the cur-

rent

limit

that

correspondstoits

output

terminal

voltage

(see

Figure 3-3), the

inv~rting

input

(U3-6)ofthe

current

• comparison

amplifierismore positive than its non-inverting

input

(U3-5),

whichisheldat-305mV.

The negative am-

plifier

output

which

resultsisclampedbyCR44 and reverse

biases

OR-gate diode CR45, leaving the voltage comparison

amplifierincontrolofthe supply's

output.Ifthe load

resis.:

tanceisdecreased, the higher

output

current

increases ER48

until

the algebraic sumofE

R48

and E

R46

makes the cur-

rent comparison

amplifier's

inverting

input

slightly

more

negative than the

-305mV

potential on its non-inverting in-

4-32 0 To +18-Volt Regulator (Model 6237A)

4-33 Except

for

differing

component

designations and

values, paragraphs

4-15

through

4-21,

which

describe the

voltage comparison

amplifier,

OR-gate, driver, series regu-

lator,

current

limit

circuit,

turn-on

control,

and

circuit

protection

componentsofthe

+2o-volt

regulator

circuit,

also

applytothe

+18-volt

regulator. In the

+18-volt

regulator,

as

in the

+20-volt

regulator, the

turn-on

bias

current

for

the

series regulator transistor

is

switched on and

offbyQ15

in

the

turn-on

control

circuittoprevent

output

voltage

transients.

4-3

4-34 Reference and

Bias

Supply

4-35

The reference

and

bias supply powers

the

operation-

al

amplifiers and provides

the

bias

and

reference voltages used

throughout

the

supply. A

shunt

zener regulates its +7.5V

output.

A series transistor regu lates its

-12.4Voutput,

using 6.2-volt zener VR1asits voltage reference.

The

-12.4V

output

provides a

constant

currenttoVR 1, whichisthe

pri-

mary voltage reference for

the

entire supply.

4-36

Two

equal resistors are

connectedinseries across

the

-12.4V

output.

To

regulate this

output,

voltage com-

parison amplifierU4compares

the

voltage across

one

of

these resistorstothe

-6.2V

reference and controls

the

con-

ductionofseries regulator

011

through driver

012.

The

voltage

drop

across

011iscontrolled by feedback so

that

the

voltagesatthe

two

inputsofU4

remain equal. Driver

012

controls

011

by shunting

partofthe

base bias supplied

by R68.

4-37 During turn-on,

the

-6.2V

reference supply

is

temporarily

shortedby014inthe

turn-on control circuit.

By

tryingtomatch this low reference,

011isinitially

turned

off. While

011isturned

off, R69 bypasses

currenttothe

-12.4V

output

until

the

output

reaches-9volts and

the

turn-on control circuit removes

the

short

from

the

reference

and enables

the

-12.4-volt

regulatortooperate

normally.

4-38

Turn-On/Turn-Off

Control

Circuit

4-39 Immediately

after

the

supplyisenergized and until

the

outputofthe

-12.4-volt

regulator reaches

about

-9

volts,

the

turn-on control circuit withholds turn-on bias

from series regulator transistors

01,

03,

and07and holds

4-4

the

-6.2V

referenceata low value. This prevents an

out-

put

voltage

transient

by ensuring

that

the

operational am-

plifiers are energized and

other

essential bias voltages are

present before

the

series regulator transistors are

turned

on.

The circuit also prevents an

output

transient when

the

sup-

plyisturned

off

by removing

the

turn-on bias from

the

se-

ries regulators and shorting

the

-6.2V

reference supply

as

the

voltageofthe

-12.4

V supply falls below-9volts.

4-40

013

switches

the

biastothe

-20-volt

regulator

on

and off,

014

switches

the

short

across

the

-6.2-volt

refer

...

ence supply, and

015

switches

the

biastothe

+20-volt

and

+6-voltor+18-volt regulators.

015

remains

turned

off

until

VR2

conductsat9 voltstoswitch it on. While

015isoff,

it holds

013

biased

off

and

014

on;

when

015

conducts,

it

turns

013

and

014

off.

4-41 Meter Circuits

4-42

Voltmeter.

Twoofthe

resistors in resistor

network

Z1

are range resistors for

the

voltmeter. The accurate ratio

of these resistors permits a single calibration

potentiometer,

R58toadjust

both

ranges simultaneously.

4-43

Ammeter.

The range switch

connects

the

ammeter

across the

current

monitoring resistorofa supply: R48

in

the

+6-voltor+18-volt supply, R8inthe

+20-volt supply,

or

R28inthe

-20-volt

supply. Eachofthese resistors con-

ducts a

constant

bias

current

for its series regulator transistor

in

additiontothe

supply's

output

current.Ifno compen-

sation were used, this additional

current

would raise

the

indicated

output

by upto8%offull scale.

The

resistor net-

works

connectedtoeach rangeofthe

ammeter

selector

switch apply a biastothe

metertooffset

this error. R59

calibrates

all

ammeter

ranges.

5-1

INTRODUCTION

SECTION V

MAINTENANCE

5-5

Table

5-1

lists

the

test

equipment

requiredtoper-

form

the

various

procedures

describedinthis

section.

5-2

Upon

receiptofthe

power

supply,

the

performance

testofParagraph 5-6 can be

made.

This

testissuitable

for

incoming

inspection.

Section

III

containsaquick

but

less

comprehensive

checkout

procedure

which

can

be used in

lieu

of

the

performance

test

if desired.

5-3 If a

faultisdetectedinthe

power

supply

while

making

the

performance

testorduring

normal

operation:

proceedtothe

troubleshooting

procedure

in Paragraph 5-32.

After

troubleshooting

and

repair,

repeat

the

performance

testtoensure

that

the

fault

has

been

properly

corrected

and

thatnoother

faults

exist. Before

performing

any

mainte-

nance

checks,

turnonthe

power

supply

and

allow

a half-

hour

warm-up.

5-4 TEST EQUIPMENT

REQUIRED

5-6 PERFORMANCE TEST

5-7

The

following

test

canbeusedasan

incoming

in-

spection

check

and

appropriate

portionsofthe

test

can

be

repeatedtocheck

the

operationofthe

instrument

after

repairs. If

the

correct

resultisnot

obtained

foraparticular

check,

proceedtothe

troubleshooting

procedures

of

Para~

graph

5-32.

--

CAUTION--

Before

applying

power

to the supply, make

certain

that

its line voltage selector

switch

(S3)

is

set

for

the line voltage to be

used.

(See

CA

UTION

noticeinParagraph 3-2

for

addi-

tional

information

on S3.)

Table

5-1.

Test

Equipment

Required

REQUIRED

RECOMMENDED

TYPE

CHARACTERISTICS

USE

MODEL

,

Digital

Sensitivity:

100J1V fyll scale Measure DC voltages: HP

3450A

Voltmeter

(min.).

Input

impedance:

calibration

procedures

10

megohms

(min.'.

Variable

Range:

90-130

Vac Vary AC

input

------

Voltage

Equipped

with

voltmeter

Transformer

accurate

within1volt

Oscilloscope

Sensitivity:

100J1V/cm.

Display

transient

re- HP

180A

with

1821A,

Differential

input.

sponse

and

ripple

and

and

1801Aor1803A

noise

waveforms.

plug-ins.

Repetitive

Rate:

60

Hz,

2J1sec.

Measure

transient

See Figure 5-5.

Load Sw.

rise

and

fall

time

response.

Resistive

Val ue: See Paragraph 5-11.

Power

supply

load

James

G. Biddle

Loads

Tolerance:

±5%

resistor (fixed resistor

("Lubri-Tact"

or

rheostat).

Rheostat)

Current

Value:

See Paragraph 5-13.

Measure

output

current

Simpson

Portable

Sampling

Accuracy:

1%

(minimum)

Shunt,

06703.

Resistor

(Shunt)

5-1

5-8 General Measurement Techniques

5-9

Connecting

Measuring Devices.

To

achieve valid

results

when

measuring

the

load

effect,

PARD (ripple

and

noise),

and

transient

recovery

timeofthe

supply,

measuring

devices

mustbeconnected

as closetothe

output

terminals

as

possible. A

measurement

made

across

the

load includes

the

impedanceofthe

leadstothe

load.

The

impedance

of

the

load leads can easily be several

ordersofmagnitude

greater

than

the

supply

impedance

and

thus

invalidate

the

measurement.

To

avoid

mutual

coupling effects, each

measuring device

mustbeconnected

directlytothe

output

terminals by separate pairsofleads.

5-10 When

measurements

are

madeatthe

front

panel

terminals,

the

monitoring

leads

mustbeconnectedatpoint

A,asshowninFigure 5-1,

and

notatpointB.Connecting

the

measuring deviceatpointBwould

resultina measure-

ment

that

includes

the

resistanceofthe

leads

between

the

output

terminals

and

the

pointofconnection.

LOAD LEAD

Figure 5-1.

Front

Panel Terminal

Connections

5-11 Selecting Load Resistors. Power

supply

specifica-

tions

are

checked

with

a full load resistance

connected

across

the

supply

output.

The

resistance

and

wattage

of

the

load resistor,

therefore,

must

permit

operationofthe

supplyatits rated

output

voltage

and

current.

For

example,

a

supply

ratedat20

volts

and

0.5

amperes

would

require a

load resistance

of40ohmsatthe

rated

output

voltage.

The

wattage

ratingofthis resistor

would

havetobeatleast

10

watts.

5-12 Either a fixed

or

variable resistor (rheostat) can be

used as

the

load resistance. Using a

rheostat

(aloneorin

series

with

a fixed resistor)isoften

more

convenient

than

using fixed resistors as loads because

the

latter

maybemore

difficulttoobtaininthe

exact

resistance required. A sup-

plier

of

rheostats

appropriate

for

testing

these

supplies

is

listedinTable 5-1.

5-13

Output

Current

Measurements.

For

accurate

out-

put

current

measurements,acurrent

sampling resistor

should

be inserted

between

the

load resistor

and

the

output

of

the

supply. An

accurate

voltmeteristhen

placed across

the

sampling resistor

and

the

output

current

calculated

by

5-2

dividing

the

voltage across

the

sampling resistorbyits

ohmic

value.

The

total

resistanceofthe

series

combination

should

be equaltothe

full load resistance as

determined

in

the

preceding paragraphs.Ofcourse,ifthe

valueofthe

sampling resistorisvery low

when

comparedtothe

full

load resistance,

the

valueofthe

sampling resistor

may

be

ignored.

The

meter

shunt

recommendedinTable 5-1,

for

example,

has a resistanceofonly

1 milliohm

and

can be

neglected

when

calculating

the

load resistanceofthe

sup-

ply.

5-14 Figure 5-2 shows a

four

terminal

meter

shunt.

The

load

current

throughashunt

must

be fedtothe

extremes

of

the

wire leadingtothe

resistor while

the

sampling con-

nections are

made

as close as possibletothe

resistance

portion

itself.

CURRENT

SAMPLING

TERMINALS

TO UNGROUNDED

TO

GROUNDED

TERMINAL

OF

"-.JV.'(/\r---~\/v\,,-I(",l--'"

TERMIN

AL OF

POWER

SUPPLY

POWER

SUPPLY

Figure 5-2.

Current

Sampling

Resistor

Connections

NOTE

All

instructions in this section apply to Models

6236A

and

6237

A unless otherwise indicated.

5-15 Rated

Output,

Tracking, Meter Accuracy,

and

Current

limit

5-16

To

check

that

all supplies will furnish

their

maxi-

mum

rated

output

voltage

and

current,

that

the

±20V

out-

puts

track

each

other,

that

the

front

panel meters are accu-

rate,

and

that

the

current

limit circuits

function,

proceed

as follows:

Voltmeter

Accuracy

a. Withnoloads

connected:

energize

the

supply,

con-

nect

a digital

voltmeter

between

the

+6V terminal (+18V

in

Model

6237A)and

common

(COM),

and

set

the

+6V

(+18V) VOLTAGE

controlsothat

the

DVM indicationisas

near

as

possibleto6 volts

(18

volts).

b.

Set

the

METER switchtothe

+6V (+18V) range

and

check

the

front

panel

voltmeter

indication. It

should

be

within 4%

of

the

DVM indication.

c. Check

the

+20V

and

-20V

rangesofthe

panel volt-

meter

similarly by

connecting

the

DVMtoeachofthese

outputsinturn,

setting

the

±20V

VOLTAGE

control

for

a

20V

DVM

indication,

and

verifying

that

the

panel

meter

is

accurate

within

4%.

Tracking

d.

Connect

the

DVMtothe

+20V

output,

set

the

±20V

VOLTAGE

control

for

a DVM

indicationof20

volts,

and

reconnect

the

DVMtothe

-20V

output

without

disturbing

the

voltage

control.

The

voltageatthe

-20V

output

should

be

within1%of

the

+20V

output.

Rated

Output

and

Ammeter

Accuracy

e.

Connect

40[2

10W load resistors across

bothofthe

20V

outputsofthe

supply

and

set

the

±20V

vaL

TAG

E

control

fora±20V

output.

(All

three

supplies

must

be

fully

loaded

while

checking

the

rated

output

voltage

and

currentofeach

supply.)

f.

Connect

the

test

setup

showninFigure 5-3tothe

+6V

(or

+18V)

output.

Make

the

total

resistanceofRL

and

the

current

sampling resistor

2.4

ohms

for

the

Model

6236A

(or

18

ohms

for

the

6237A)to

permit

operating

the

output

at

full load. RLshould

have a

power

ratingofat

least20watts.

g.

Close

the

switch

and

set

the

+6V

(+18V)

VOLTAGE

controlsothat

the

DVM indicates a voltage

drop

across

the

current

sampling resistor

that

correspondstoa

current

of

2.5

amps

(6236A)or1.0

amp

(6237

A).

h.

Set

the

METER

switchtothe

+6V (+18V) range

and

verify

that

the

front

panel

ammeter

indicationiswithin

4%

of

2.5

amps

((6236A)or1.0

amps

(6237

A).

i.

Connect

the

DVM

directly

across

the

output

terminals

of

the

+6V

(+18V)

supply,

record

the

DVM reading,

and

then

open

the

switchinthe6V(18V)

load

circuit

without

disturbing

the

supply's

output

terminals.

The

DVM indica-

tion

should

not

changebymore

than

2.6mV

(6236A)

or

3.8mV

(6237

A).

j.

Check

the

rated

output

and

ammeter

accur'!cyofthe

+20V

and

-20V

supplies similarlybyconnecting

the

test

setupofFigure 5-3toeach

outputinturn.

For

each

20V

supply:

make

the

total

resistanceofRL

and

the

current

sampling resistor40ohms,

set

the

±20V

VOLTAGE

con-

trol

foracurrent

indicationonthe

DVMof0.5A,

check

that

the

panel

meter

indicationiswithin4%of

0.5A,

connect

the

DVMtothe

fully loaded

output

terminals,

and

compare

the

output

voltage

before

and

after

the

load

circuitisopened.

The

voltage

should

not

changebymore

than

4mV.

While

checking

each

supply,

the

other

two

must

be fully

loaded.

Current

Limit

k.

Disconnect

all loads

from

the

supply.

I.

Connect

the

test

setup

showninFigure 5-3tothe

+20-

volt

output.

Substituteashort

forRLand

leave

the

load

circuit

switch

open.

m.

Set

the

voltageofthe

:t20V

suppliesto20

volts.

n. Close

the

load

switch

and

determine

the

current

flow

through

the

current

sampling resistor

(meter

shunt)

by

measuring its voltage

drop

with

the

DVM.

The

current

5-3

shouldbe0.55A

±5%.

o. Check

the

current

limitofthe

-20V

supplyinthe

same way. Its

short-circuit

current

should

also be

0.55A

±5%.

p. (Model

6237A

only).

Check

the

current

limitofthe

+18V

supply

similarly by

setting

its

output

for18volts

and

using a DVMtomeasure

the

current

which flows

through

a low-resistance

current

sampling resistor.

The

short-circuit

currentofthe

+18V

supply

should

be 1.1 A ±5%.

q. (Steps (q)

through

(s)

applytothe

6236A

only.)

Connect

the

test

setup

shown

in Figure 5-3tothe

+6V

out-

put.

Close

the

switch,

set

the

total

resistanceofR

Land

the

current

sampling resistortoan

initial valueof2.4

ohms

or

greater,

and

set

the

output

voltageto6 volts.

r.

Reduce

the

valueofRL

gradually

while observing

the

output

current

indicatedbythe

DVM.

The

current

should

increasetoa

maximumof2.75A

±5%

before

it begins

to

decrease.

s.

Connectashort

across RL

and

then

recheck

the

current

indicatedbythe

DVM.

The

short-circuit

currentofthis

output

should

be 1A ±15%.

Disconnect

the

test

setup

from

the

supply.

5-17 Load

Effect

(Load Regulation)

Definition:

The

change

~EOUT

in

the

static

valueofdc

output

voltage resulting

from

a change in load

resistance

from

open

circuittoa value which yields maxi-

mum

rated

output

current

(or vice versa).

5-18

To

check

the

load

effect:

a.

Connect

a full load resistance

and

a digital

voltmeter

across

the

outputofthe

+20V

supply.

b.

Turnonthe

supply

and

adjust

its voltagetoits

maxi-

mum

rated

value.

c.

Record

the

voltage

indicatedonthe

DVM.

d.

Disconnect

the

load resistance

and

recheck

the

DVM

indication.Itshouldbewithin

.01% plus

2mVofthe

read-

ing

in

step

(c).

e.

Repeat

steps

(a)

through

(d)

for

eachofthe

remain-

ing

supply

outputs.

POWER

SUPPLY

UNDER TEST

-

COM.

+

R

L

0

()

("\.

)'

TV

1

DIGITAL

(RHEOSTAT)

VOLTMETER

CURRENT

+ - G

SAMPLING

(

(l9

RESISTOR

~

-

f'

.~

-

(SHUNT)

Figure 5-3.

Output

Current,

Test

Setup

5-19 Source

Effect

(Line Regulation)

Definition:

The

change,

b.

E

OUT

' in

the

static

valueofdc

output

vcltage resulting

fromachange

in ac

input

voltage over

the

specified range

from

low line (typi-

cally

104

Vac)tohigh line (typically

127

Vac),orfrom

high linetolow line.

rectification),

an oscilloscope display showing a

120

Hz

fundamental

componentisindicativeofa

"c1ean"

measure-

ment

setup,

while

the

presenceofa60Hz

fundamental

usually

means

thatanimproved

setup

will resultina

more

accurate

(and lower) valueofmeasured

ripple.

5-24 Figure

5-48

shows a

correct

methodofmeasuring

the

output

rippleofa

constant

voltage

power

supply

using

a single-ended

scope.

The

ground

loop

pathisbroken

by

floating

the

power

supply

output.

To

ensure

thatnopoten-

tial

difference

exists

between

the

supply

and

the

oscilloscope,

it

is

recommended

that

they

both

be plugged

into

the

same

ac

power

bus.Ifthe

same bus

cannot

be used,

both

ac

grounds

mustbeat

earth

ground

potential.

5-20

To

test

the

source

effect:

a.

Connect

a variable

autotransformer

between

the

in-

put

power

source

and

the

power

supply

line plug.

b.

Connect

a full load resistance

and

a digital

voltmeter

across

the

outputofthe

+20V

supply.

c.

Adjust

the

autotransformer

for

a low line

input.

d.

Turnonthe

power,

adjust

the

outputofthe

supply

to

its

maximum

rated

voltage,

and

record

the

DVM indica-

tion.

e.

Adjust

the

autotransformer

for

a high line

input

and

recheck

the

DVM

indication.Itshouldbewithin

.01 %plus

2mVofthe

readinginstep

(d).

f.

Repeat

steps (b)

through

(e)

for

eachofthe

remaining

supply

outputs.

POWER SUPPLY CASE

•

OSCILLOSCOPE CASE

Figure 5-4. Ripple

and

Noise,

Test

Setup

AC-+--­ACC
GND

,..---f-..,.,....,~

AC

ACC
GND

I

I

I

VERTICAL I

.xr-+----~~G

INPUT I

:--~~EG

I

L

~_~~

__

---_J

A.

INCORRECT METHOD - GROUND CURRENTIGPRODUCES

60

CYCLE

DROPINNEGATIVE LEAD WHICH

ADDSTOTHE

POWER

SUPPLY

RIPPLE

DISPLAYED

ON SCOPE.

POWER

SUPPLY

CASE

OSCILLOSCOPE CASE

AC

f,C

ACC

ACC

GND

GND

+

+

- VERTICAL

G

G

INPUT

POWER

SUPPLY CASE

OSCILLOSCOPE CASE

AC

AC

ACC

ACC

GND

GND

+

+

- VERTICAL

G

G

INPUT

B.

A CORRECT

METHOD

USING A

SINGLE

-ENDED

SCOPE.

OUTPUT FLOATED TO

BREAK

GROUND CURRENT LOOP,

TWISTED

PAIR

REDUCES

STRAY

PICKUPONSCOPE

LEADS.

C.

A CORRECT METHOD USING A

DIFFERENTIAL

SCOPE WITH

FLOATING INPUT. GROUND CURRENT PATH

IS

BROKEN;

COMMON MODE REJECTION

OF

DIFFERENTIAL

INPUT

SCOPE

IGNORES DIFFERENCE IN GROUND

POTENTIAL

OF POWER

SUPPLY 8 SCOPE, SHIELDED TWO WIRE FURTHER

REDUCES

STRAY PICKUPONSCOPE LEADS.

5-21 PARD (Ripple and Noise)

Definition:

The

residual ac voltage whichissuper-

imposedonthedcoutputofa regulated

power

supply.

Ripple

and

noise

may

be specified

and

measuredinterms

of

its rmsorpeak-to-peak

value.

5-22

Measurement

Techniques.

Figure 5-4A

shows

an

incorrect

methodofmeasuring

Pop

ripple. Note

that

a con-

tinuous

ground

loop

exists

from

the

third

wireofthe

input

power

cordofthe

supplytothe

third

wireofthe

input

power

cordofthe

oscilloscope via

the

grounded

power

sup-

ply case,

the

wire

between

the

negative

output

terminal

of

the

power

supply

and

the

vertical

inputofthe

scope,

and

the

grounded

scope

case.

Any

ground

current

circulating

in this

loop

as a resultofthe

differenceinpotential

E

G

between

the

two

ground

points

causes an IR

drop

which

isinseries

with

the

scope

input.

This IR

drop,

normally

having a60Hz

Iine

frequency

fundamental,

plus

any

pick-

uponthe

unshielded

leads

interconnecting

the

power

sup-

ply

and

scope,

appearsonthe

faceofthe

CRT.

The

magni-

tudeofthis

resulting signal can easily be

much

greater

than

the

true

ripple

developed

between

the

plus

and

minus

out-

put

terminalsofthe

power

supply

and

can

completely

in-

validate

the

measurement.

5-23

The

same

ground

current

and

pickup

problems

can

exist

if an rms

voltmeterissubstitutedinplaceofthe

oscil-

loscope

in

Figure 5-4. However,

the

oscilloscope display,

unlike

the

true

rms

meter

reading, tells

the

observer imme-

diately

whether

the

fundamental

periodofthe

signal dis-

playedis8.3

milliseconds

(1/120

Hz)or16.7

milliseconds

(1/60

Hz). Since

the

fundamental

ripple

frequency

present

on

the

outputofan HP

supplyis120Hz(duetofull-wave

5-4

c.

Repeat

for

the

remaining

supply

outputs.

OSCILLOSCOPE

RT

(NOTE

4)

NOTES:

I.

THIS

DRAWING

SHOWS

A

SUGGESTED METHOD

OF
BUILDING A LOAD SWITCH.
HOWEVER. OTHER
METHODS

COULD BE USED;
SUCH AS A TRANSISTOR
SWITCHING NETWORK.
MAXIMUM

LOAD RATINGS

OF

LOAD SWITCH ARE:

5AMPS.500V,

250W

(NOT

2500W

l.

2.

USE

MERCURY RELAY

CLARE TYPE HGP

1002

OR

W.E. TYPE

276B.

3.

SELECT CONTACT

PRO­TECTION NETWORK
ACCORDINGTOMERCURY

RELAY MANUFACTURERS
INSTRUCTIONS

4.

EACH RTIS

EQUAL TO

TWICE THE

NORMAL

FULL

LOAD RESISTANCE

(2

XRL)

USED IN PREVIOUS TESTS.

CONTACT

PROTECTION

NETWORK

r-

(NOTE

3)------

r----

-----

I N.C.

I

I

I

I

-,

I

:t :

I N.C. I

I I

I

I

I

I

I

I

I I

I

REPETITIVE

I

~~~

~W~~_(!::02.E~)

__

.J

+

POWER SUPPLY

UNDER TEST

Figure 5-5. Load

Transient

Recovery

Time,

Test

Setup

5-29 Load Transient Recovery Time

Definition:

The

time

"x"

for

output

voltage

recovery

to

within

"Y"

millivoltsofthe

nominal

output

voltage following a

"Z"

amp

step

changeinload

current,

where:

"X"

equals 50J,lsec,

"Y"

equals

15mV,

and

"z"

is

the

specified load

current

change,

equaltohalfofthe

cur-

rent

ratingofthe

supply.

The

nominal

output

voltage

is

definedasthedclevel

halfway

between

the

static

output

voltage

before

and

after

the

imposed

load change.

5-30

Measurement

Techniques.

Care

mustbetaken

in

switching

the

load resistanceonand

off. A

hand-operated

switchinseries

with

the

loadisnot

adequate

since

the

re-

sulting

one-shot

displays are

difficulttoobserveonmost

oscilloscopes

and

the

arc

energy

occurring

during

switching

completely

masks

the

display

with

a noise burst.

Transistor

load

switching

devices are expensive if

reasonably

rapid load

current

changes aretobe achieved. Instead, a

mercury-

wetted

relay

should

be used

for

loading

and

unloading

the

supply.

Connect

it in

the

load switching

circuit

shown

in

Figure 5-5. When

this

load

switchisconnectedtoa60Hz

ac

input,

the

mercury-wetted

relay will

open

and

close

60

times

per

second.

The

25K

control

adjusts

the

duty

cycle

of

the

load

current

switchingtoreduce

jitterinthe

oscillo-

scope display. This relay

may

also be used

witha50

Hz

ac

input.

5-25

Eitheratwisted

pair

or,

preferably,

a shielded

two-wire cable

should

be usedtoconnect

the

output

termin-

alsofthe

power

supplytothe

vertical

input

terminals

of

the

scope. When using a

twisted

pair, care

mustbetaken

that

oneofthe

two

wiresisconnectedtothe

grounded

in-

put

terminalofthe

oscilloscopetoensure

that

the

supply

outputissafely

grounded.

When using shielded two-wire,

it

is

essential

for

the

shieldtobe

connectedtoground

at

one

end

onlytoprevent

ground

current

flowing

through

this shield

from

inducing a signal in

the

shielded leads.

5-27

In

most

cases,

the

single-ended

scope

method

of

Figure 5-4B will be

adequatetoeliminate

non-real

compon-

entsofripple so

thatasatisfactory

measurement

may

be

obtained.

However,inmore

stubborn

cases (or if high

frequency

noiseupto20MHz

mustbemeasured),itmay

be necessarytouse a differential

scope

with

floating

input

as

showninFigure 5-4C. If desired,

two

single-conductor

shielded cables

maybesubstitutedinplaceofthe

shielded

two-wire cable

with

equal success. Becauseofits

common

mode

rejection, a

differential

oscilloscope displays

only

the

difference

in signal

between

its

two

vertical

input

terminals,

thus

ignoring

the

effectsofany

common

mode

signal pro-

ducedbythe

differenceintheacpotential

between

the

power

supply

case

and

scope

case. Before using a differen-

tial

input

scopeinthis

manner,

however, itisimperative

that

the

common

mode

rejection

capabilityofthe

scope'

be verifiedbyshorting

together

its

two

input

leadsatthe

power

supply

and

observing

the

traceonthe

CRT.itthis

traceisa

straight

line,

then

the

scopeisproperly

ignoring

any

common

mode

signal

present.Ifthis

traceisnot

a

straight

line,

then

the

scopeisnot

rejecting

the

ground

signal-and

must

be realignedinaccordance

with

the

manu-

facturer's

instructions

until

proper

common

mode

rejection

is

attained.

5-26

To

verify

that

the

oscilloscopeisnot

displaying

ripple

thatisinducedinthe

leadsorpickedupfrom

the

grounds,

the

(+)

scope

lead

shouldbeshortedtothe

(-)

scope leadatthe

power

supply

terminals.

The

ripple value

obtained

when

the

leads are

shorted

shouldbesubtracted

from

the

actual

ripple-measurement.

5-28

Measurement

Procedure.

To

measure

the

ripple

and

noiseoneach

supply

output,

follow

the

steps

below,

If

a high

frequency

noise

measurementisdesired, an oscil-

loscope

with

sufficient

bandwidth

(20 MHz)

must

be used.

Ripple

and

noise

measurements

canbemadeatany

input

ac line voltage

combined

with

anydcoutput

voltage

and

load

current

within

rating.

a.

Connect

an oscilloscopeorrms

voltmeter

across an

outputofthe

supplyasshowninFigures 5-4Bor5-4C.

b.

Energize

the

supply

and

observe

the

oscilloscope

or

meter

indication.

The

ripple

and

noise

should

not

be

greater

than

0.35mV

rmsor1.5mV

peak-to-peak.

5-5

5-31

Measurement

Procedure.

To

measure

the

load

transient

recovery

time,

follow

the

steps

below

for

each

supply

output.

Transient

recovery

time

maybemeasured

at

any

input

line voltage

and any

output

voltage

within

rating.

For

this

supply

the

specified load changeisbetween

half load

and

full load.

a.

Connect

the

test

setup

showninFigure 5-5. Both

load resistors (RT) are

twice

the

normal valueofa full load

resistance.

b.

Turnonthe

supply

and

close

the

line switchonthe

repeti+ive load switch.

c.

Set

the

oscilloscope

for

internal

sync

and

lock

on

either

the

positiveornegative load

transient

spike.

d.

Set

the

vertical

inputofthe

oscilloscope

foraccoup-

ling so

that

smalldclevel changesinthe

output

voltage

of

the

power

supply

will

not

cause

the

displaytoshift.

e.

Adjust

the

horizontal

positioning

controlsothat

the

trace

startsata

point

coincident

withamajor

graticule

division. This

point

then

represents

time

zero.

f.

Adjust

the

vertical

centeringofthe

scopesothat

the

tail

endsofthe

no-load

and

full-load

waveforms

are

symmet-

rically displaced

about

the

horizontal

center

lineofthe

oscil-

loscope. This

center

line

now

represents

the

nominal

output

voltage

definedinthe

specification.

g.

Increase

the

sweep rate so

that

a single

transient

spike

canbeexaminedindetail.

h.

Adjust

the

sync

controls

separately

for

the

positive

and

negative going

transientssothat

not

only

the

recovery

waveshape

but

also as

much

as possibleofthe

rise

time

of

the

transientisdisplayed.

i.

Starting

from

the

major

graticule division representing

time

zero,

counttothe

right

50psec

and

vertically

15mV.

Recovery

shouldbewithin

these

tolerances,

as illustrated

in

Figure 5-6.

5-32 TROUBLESHOOTING

5-33 Before

attemptingtotroubleshoot

this

instrument,

ensure

that

the

faultisin

the

instrument

itself

and

notinan

associated piece

of

equipment.

You can

determine

this

with-

out

removing

the

covers

from

the

instrument

by using

the

appropriate

portionsofthe

performance

testofParagraph

5-6.

5-34 A

good

understandingofthe

principlesofopera-

tionisa helpful aidintroubleshooting,

and

the

reader

is

advisedtoreview

SectionIVof

the

manual

before

begin-

ning

detailed

troubleshooting.

Once

the

principlesofoper-

ation

are

understood,

proceedtothe

initial

troubleshoot-

ing

procedures

in Paragraph 5-35.

--

CAUTION--

Before

applying

power

to the supply, make

certain

that

its line voltage selector switch (S3)

is

set

for

the line voltage to be

used.

(See

CAUTION

noticeinParagraph 3-2

for

additional

information

on S3.)

5-35

Initial

Troubleshooting Procedure

5-36 If a

malfunctionisfound,

follow

the

steps below:

a.

Disconnect

input

power

from

the

supply

and

remove

all

loads

from

the

output.

b.

Table

5-2 lists

the

symptoms

and

probable

causes

of

several possible

troubles.Ifthe

symptomisoneofthose

listed,

make

the

recommended

checks.

c. If

noneofthe

symptomsofTable 5-2

apply,

proceed

to

Table

5-3. This

table

provides an initial

troubleshooting

procedure

that

also

directs

youtothe

more

detailed

pro-

cedures

which

follow

it.

Figure 5-6. Load

Transient

Recovery

Time

Waveforms

POSITIVE

OUTPUT-UNLOADING TRANSIENT LOADING TRANSIENT

NEGATIVE OUTPUT-LOADING TRANSIENT UNLOADING TRANSIENT

Open

Fuse

Troubleshooting

5-38

5-37

The

numbered

test

points

referredtoin

the

trouble-

shooting

procedures

are

identifiedonthe

circuit

schematic

andonthe

component

location

diagramatthe

rearofthe

manual.

5-39

Although

transientsorfatigue

can

cause a fuse

to

blow,itisagood

ideatoinspect

the

unit

for

obvious

shorts

such as

damaged

wiring,

charred

components,orextraneous

metal

partsorwire clippingsincontact

with

circuit

board

conductors

before

replacing

the

fuse.

The

ratingofthe

correct

replacement

fuse

dependsonthe

line voltage

option

of

the

instrument:

for

Options

100or120,

use a normal

time-constant

2-amp fuse (HP

Part

No.

2110-0002);

for

Options

220or240,

use a

normal

time-constant

1-amp

fuse (HP

Part

No.

2110-0001).

v

15MV

~

14----.~--

50",

SECONDS

E

NOM

-r--,---------

50",

SECONDS

15

MV

T

5-6

Table 5-2. Miscellaneous

Troubles

SYMPTOM

CHECK - PROBABLE CAUSE

High ripple

a.

Check

operating

setup

for

ground

loops (see Paragraph 5-22).

b. Check main rectifiers (CR11,

CR12,

CR31,

CR32,

CR51,

CR52)

for

open.

c.

Supply

may be

operatingincurrent

limit mode. Check

current

limit

adjustment,

Paragraph 5-16, steps (k)

thru

(s).

Will

not

current

limit

Check

for

open

OR-gate diodes (CR5,

CR25,

CR45)ordefective

current

limit amplifier (U1, U2, U3).

Poor

loadorline regulation

a.

Check bias

and

reference voltages, Table 5-4.

b.

Check main rectifiers

and

filters

for

opens.

Oscillation

or

poor

transient

a.

High

frequency

oscillations (above50KHz) can be caused by an

recovery

time

open

C4, C14,orC24.

b.

A defective

output

capacitor

(C1, C11,orC21) can cause

oscillations

in

oneofmany

frequency

ranges.

c.

Oscillation

onlyinthe

current

limiting

mode

can be caused

by an

open

C3, C13,orC23.

Transient

voltage

overshoot

a.

Overshoot

onlyinthe

-20V

supply

can be caused by a

at

turn-onorturn-off.

shorted

013.

b.

Overshootinall

three

supply

outputs

can

be caused by an

open

014ora

shorted

015.

/

..

Table 5-3. Initial

Troubleshooting

Procedure

STEP

ACTION

RESPONSE

NEXT ACTION

1

Check

output

voltageof+20V

q.

Normal

a.

Proceed

to

step

(2).

supply.

b.

Zero

volts

b.

Check ac line fuse (F1).

If

blown,

proceed

to

Paragraph

5·38.Ifnot

blown,

check

bias

and

reference voltages (Table 5-4).

c.

Output

voltage lower

c.

Check bias

and

reference voltages

or

higher

than

rating.

(Table 5-4).

2

Check

output

voltageof-20V

a.

Normal

a.

If

+20V

and

-20V

outputs

are

both

supply.

normal

with

no load, a

supply

might

be

current

limiting

under

load.

To

check

this

adjustment

see Paragraph 5-16,

steps (k)

thru

(0).

b.

High, low,

or

zero

b.

Proceed

to

-20V

supply

troubleshooting,

output

voltage.

Table 5-6.

5-7

Table 5-3.

Initial

Troubleshooting Procedure (Continued)

STEP

ACTION

RESPONSE

NEXT

ACTION

3

Check

outputof+6V

supply

a.

Normal

a.

If

the

outputofthis supplyisnormal

(Model

6236A)

unloaded

but

its voltage falls when

or

+18V

supply

loaded, check the current

limit

adjust-

(Model 6237 A).

ment, Paragraph 5-16, steps (p)

thru

(s).

b.

High, low,orzero

b.

ProceedtoTable 5-7.

output

voltage.

Table 5-4.

Bias

and Reference Voltage Check

STEP

ACTION

RESPONSE

PROBABLE CAUSE

1

Check +7.5V bias,

TP1

to

a.

Normal

a.

Proceedtostep (2).

common

(+7.5V ±5%)

b.

Voltage high

b.

Check

VR3

for

open.

c.

Voltage

low

c.

Check

VR3

for

short.

Note: A short

within

U1, U2, U3,orU4

can

cause

low

+7.5Vor-12.4V

bias voltages.

2

Check

-6.2V

reference,

a.

Normal

a.

Proceedtostep (3).

TP2

to

common

(-6.2V

±5%)

b.

Voltage high

b.

Check V R1

for

open.

c.

Voltage

low

c.

Check VR1 and Q14

for

short,

VR2

and Q15

for

open.(Ashort

within

U4

could reduce this voltage.)

3

Check

-12.4

V bias,

a.

Normal

a.

Proceedto+20V

supply troubleshooting.

TP3

to

common

(-12.4V

±5%)

Table 5-5.

b.

High voltage

b.

Check

Q11

for

short, Q12

for

open,

and

Z1

for

open between pins 3 and

5.

c.

Low

voltage

c.

Check

Q11

for

open, Q12

for

short,

and

Z1

for

open between pins 1 and 3.

5-8

Table 5-5.

+20V

Supply

Troubleshooting

SYMPTOM

High

output

voltage

(higher

than

rating)

Low

output

voltage

(lower

than

rating)

STEP

- ACTION

1.

Attempttoturn

down

loopbyshorting

015

emitter-

to-base

2. Measure voltage

at

OUt-

putofOR-gate (TP4).

1. Measure voltage

at

out-

putofOR-gate (TP4).

2. Measure voltage

at

TP8.

3. Measure voltage

at

TP7.

4. Measure voltage

at

TP13.

/

RESPONSE - PROBABLE CAUSE

a.

If

output

voltage remains high,

check

01,

015,

and

CR9

for

short.

b.

If

output

voltage fallstonear zero, remove

short

from

015

and

proceedtostep

(2).

a.IfTP4isapprox.

-0.7V,

check

for

open

CR6

or

R1,

and

defective U1.

b.

:f

TP4isapprox.

+0.7V,

check

for

defective

02.

a.

If

TP4isbetween

zero

and

-0.

7V,

check

for

open

01,

015,R14,orCR59,

and

defective

02.

b.

If

TP4isapprox.

+0.7V,

proceedtostep

(2).

a.

If

voltageatTP8ispositive,

check

Z1

for

open

between

pins 5

and

13,

check

R8 for

open,

and

check

for

defective R6orU1.

b.

If

TP8isapprox.

-0.7V,

proceedtostep

(3).

a.

If

TP7isapprox.

+0.7V,

check

CR6

for

short.

b.

If

TP7isapprox.

+1.4V,

proceedtostep

(4).

a.

If

TP13isapprox.

-0.7V,

replace U1.

b.

If

TP13iszero

volts,

check

for

open

R10,

and

shorted

CR2orCR3.

c.

If

TP13isapprox.

+0.7V,

check

for

open

R2,

shorted

R1,orleakyorshorted

C2.

.

Table 6-6.

-20V

Supply

Troubleshooting

SYMPTOM

STEP

- ACTION

RESPONSE - PROBABLE CAUSE

NOTE:

The

+20V

supply

must

operate

properly

before

troubleshooting

the

-20V

supply.

High

output

vo1tage

1.

Attempttoturn

down

a.

If

output

voltage remains high,

check

03,

CR29,

(more

than

1% greater

loop

by

shorting

013

and

013

for

short.

than

+20V

supply)

emitter-to-base.

b.

If

output

fallstonear zero, remove

short

from

013

and

proceedtostep

(2).

2.

Measure voltage

at

out-

putofOR-gate (TP5)

a.

If

voltageatTP5iszeroornegative,

check

for

defective

04.

b.IfTP5ispositive,

proceedtostep

(3)

5-9

Table 5-6.

-20V

Supply

Troubleshooting

(Continued)

SYMPTOM

STEP

- ACTION

RESPONSE - PROBABLE CAUSE

3.

Measure voltage

at

TP14.

a.

If

TP14isapprox.

-O.7V,

check

for

open

CR26

or

defective U2.

b.

If

TP14isapprox.

+0.7V,

checkZ1for

open

from

pin 7to12orfor

short

from

pin 6

to

1~.

Low

output

voltage

1.

Measure voltage

at

TP5.

a.

If

voltageatTP5iszeroorpositive,

check

for

open

(more

than

1% lower

Q3,

Q13,orR34,

and

defective Q4.

than

+20V

supply)

b.

If

TP5

voltageisapprox.

-0.7V,

proceedtostep

(2).

2.

Measure voltageatTP9.

a.

If

TP9isnegative,

check

for

openZ1between

pins 5

and

15,

open

R28,

and

defective R26orU2.

b.

If

TP9isapprox.

+0.7V,

proceedtostep

(3).

3. Measure voltage

at

TP10.

a.

If

TP10isapprox.

-0.7V,

check

CR26

for

short.

b.

If

TP10is-1.0

to

-1.4V,

proceedtostep

(4).

4.

Measure voltageatTP14.

a.

If

TP14isapprox.

+0.7V,

replace U2.

b.

If

TP14iszero

volts,

check

for

shorted

CR22

or

CR23.

c.IfTP14isapprox.

-0.7V,

check~1for

open

between

pins 6

and12or

short

between

pins 7

and

12,

and

check

for

leakyorshorted

C12.

Table 5-7. +6V

or

+18V

Supply

Troubleshooting

SYMPTOM

STEP

- ACTION

RESPONSE - PROBABLE CAUSE

.

High

output

voltage 1.

Attempttoturn

down

loop

a.

If

output

voltage remains high,

check

Q7,

Q15,

(higher

than

rating)

by

shorting

Q15

emitter-to-base.

and

CR49

for

short.

b.

If

output

voltage fallstonear zero, remove

short

from

Q15

and

proceedtostep

(2).

2.

Measure voltage

at

output

a.

If

TP6isapprox.

-0.7V,

check

for

open

CR46

or

of

OR-gate (TP6).

R41,

and

defective U3.

b.

If

TP6isapprox.

+0.7V,

check

for

defective Q8.

Low

output

voltage

1. Measure voltage

at

output

a.

If

TP6isbetween

zero

and

-0.

7V,

check

for

open

(lower

than

rating)

of

OR-gate (TP6).

Q7,

Q15,

R54,orCR59,

and

defective Q8.

b.

If

TP6isapprox.

+0.7V,

proceedtostep

(2).

5-10

Table 5-7.

+6Vor+18V

Supply

Troubleshooting

(Continued)

SYMPTOM

STEP

- ACTION

RESPONSE - PROBABLE CAUSE

2.

Measure voltageatTP12.

a.

If

voltageatTP12ispositive,

check

for

shorted

R49,

open

R48,

openZ1between

pins 5

and

14,

and

defective R46orU3.

b.

If

TP12

is

a~prox.

-0.7V,

proceedtostep

(3).

3.

Measure voltageatTP11

..

a.IfTP11isapprox.

+0. 7V,

check

CR46

for

short.

b.

If

TP11isapprox.

+1.4V,

proceedtostep

(4).

4.

Measure voltage

at

TP15.

a.

If

TP15isapprox.

-0.7V,

replace U3.

b.

If

TP15iszero

volts,

check

for

open

R50, and

shorted

CR42orCR43.

c.

If

TP15isapprox.

+0.7V,

check

for

shorted

R41,

open

R42,orleakyorshorted

C22.

5-40

REPAIR

AND

REPLACEMENT

becauseofinclusion in this table.

Series

Regulator Replacement

5-46

ADJUSTMENT

AND

CALIBRATION

5-42

To

remove

and

replace a series regulator

transistor:

a.

Remove

the

top

and

bottom

covers from

the

instru-

ment.

b.

Remove

the

collector

screws

and

unsolder

the

base

and

emitter

leads from

the

boardtoremove

the

transistor.

c.

To

replace

the

transistor,

follow

the

below reassembly

order,asviewed

from

the

bottomofthe

heat

sink:

collector

screws,P.C.

board,

heat

sink,

two

insulating bushiflgs (in

collector

screw holes in

heat

sink), silicon grease

(Dow

DC-3

or

HP6040-0209),

mica insulator,

another

coatingofsilicon

grease,

transistor,

lock-washers,

and

hex-nuts.

d. Resolder

the

emitter

and

base pinstothe

circuit

board.

5-43 Semiconductor Replacement

5-44 Table 5-8

contains

replacement

data

for

the

semi-

conductors

usedinthis

power

supply.

When replacing a

semiconductor,

use

the

listed Hewlett-Packard

partorexact

commercial

replacementifthese

are available.Ifneither

of

these are

immediately

available

andapartisneeded

without

delay

for

operationortroubleshooting

verification,

the

parts

listed in

the

Alternate

column

canbetried

with

a high

probabilityofsuccess.

5-45 Notice

that

both

the

commercial

and

alternate

re-

placements

listed in Table 5-8

apply

onlytotheHPpower

supplies covered by this manual

and

their

useinany

other

Hewlett-Packard

instrumentisnot

necessarily

recommended

5-11

5-47 Current

Limit

Adjustment

5-48

±20V

Supplies. Perform

the

following steps

to

adjust

the

current

limit

circuitinthe

+20Vor-20V

supply.

Potentiometer

R6 sets

the

+20V

and

R26

the

-20V

current

limit.

a.

Turn

the

current

limit

adjustment

pot

(R6orR26)

fully

counterclockwisetoits

minimum

setting.

b.

Connect

the

test

circuitofFigure 5-3tothe

output

of

the

supplytobe

adjusted.

Use a

40n

10W resistor

for

RL·

-c.

Turnonthe

supply

and

set

the

±20V

VOLTAGE

control

for

maximum

output

(fully clockwise).

d.

Turn

the

current

limit

pot

(R6orR26) slowly

clockwise until

the

DVM indicates a voltage

drop

across

the

shunt

correspondingtoa

currentof0.55A

±5%.

5-49

+6V

Supply

(Model

6236A).

To

adjust

the

current

limit

circuitinthe

+6V

supply,

proceedasfollows:

a. Check

the

settingofthe

current

limit by

performing

steps (q)

and

(r)ofParagraph 5-16. (Be suretoset

the

output

voltageto6 volts.)Ifreducing

the

load resistance

permits

the

currenttoexceed

2.9A,

stop,

turn

R46 slightly

clockwise,

and

repeat

the

test. If, instead,

the

cur-

rent

beginstofall

before

it reaches

2.6A,

turn

R46 slightly

counterclockwise

and

repeat

the

test.

b. Recheck

the

setting

and

readjust R46 until

the

test

shows

that

the

current

limit

circuit

beginstoreduce

the

current

when

a decreasing load resistance increases 'it

to

2.75A

±5%.

Table 5-8.

Semiconductor

Replacement

Data

Reference

HP

Exact

Designator

Part

No.

Commercial

Alternate

Replacement

CR1, 9,

11-12,21,28-29,

1901-0327

1

N5059

31-32, 55-56,

59

CR2-7 ,22-26,42,43,45-47

1901-0033

lN485B

CR41,

49,

51-52

1901-0416

lN4999

CR44,57

1901-0460

STB523

01,

7

1853-0063

SJ1528

02,

12,

15

1854-0448

SSl147

Mot

03,8

1854-0563

2N3055

04

1853-0012

2N2904A

011

1853-0052

2N3740

.

013

1853-0041

2N4036

014

1854-0027

2N2714A

Ul-3

1826-0092

CA

3458T

RCA

U4

1820-0223

LM

301AH

Nat

VRl

1902-1221

lN825

VR2

1902-3149

lN4353B

VR3

1902-0650

1N5343B

5-50

+18V

Supply

(Model

6237A).

To

adjust

the

current

limit circuit in

the

+18V supply, proceed as follows:

a. Turn

current

limit

adjustment

pot

(R46) fully clock-

wise

to

its minimum setting.

b.

Connect

the

test

circuitofFigure 5-3tothe

output

of

the

+18V supply.

Usean18n

20W resistor for RL.

c. Turn on

the

supply and set

the

+18V VOLTAGE

control

for

maximum

output

(fully clockwise).

d.

Turn

current

limit

pot

(R46) slowly counterclockwise

until

the

DVM

indicates a voltage

drop

across

the

shunt

correspondingtoa

currentof1.1 A ±5%.

5-51 Meter Calibration

5-52

Panel

Voltmeters.

Check

the

accuracyofthe

panel

voltmeter

by performing steps (a), (b),

and

(c)ofthe

pro-

cedure

in

Paragraph 5-16. Since

the

same range resistors are

used

in

both

20-volt ranges,

their

accuracy will be

the

same.

Adjust R58 so

that

the

percentage

errorinthe

+6V range

(or +18V range)

is

equaltothe

errorinthe

20-volt ranges.

Turn

R58 clockwisetoincrease

the

indicationsorcounter-

clockwisetodecrease

them.IfR58

cannot

calibrate

all

voltmeter

rangestowithin

the

±4% specification,

check

the

valuesofthe resistorsinthe

voltmeter

circuit.

5-53 Panel

Ammeter.

Check and calibrate

the

panel

ammeter

by following

the

steps below.

a.

Connect

the

test

setup

showninFigure 5-3tothe

+6V

(or +18V)

output.

Make

the

total

resistanceofRL and

the

current

sampling resistor 2.4

ohms

(Model

6236A)or18

ohms (6237A)to

permit

operating

the

supplyatits full

rated

output.

RL should have a

power

ratingofat

least

20

watts.

b. Close

the

switch and

set

the

+6V (+18V) VOLTAGE

controlsothat

the

DVM

indicates an

outputof2.5A

(6236A)or1.0A

(6237A).

c. Check

and

record

the

panel

ammeter

accuracyonthe

+6Vor+18V range.

d. Check each

of

the

20-volt

ammeter

ranges similarlY,

using

the

same

test

setup

but

making RL a

40n

lOW resistor

and setting

the

voltage

control

for a

0.5A

output

current.

Record

the

panel

ammeter

accuracyoneach 20-volt range.

e.

Turn

R59 clockwisetoincrease

the

indicatio~s

on

all

three

rangesorcounterclockwisetodecrease

them.

f.IfR59

cannot

calibrate

all

three

ammeter

ranges

to

within

the

±4% specification, check

the

valuesofthe

resis-

tors in

the

circuit, including

current

monitoring resistors

R8, R28, and R48.

5-12

SECTION

VI

REPLACEABLE

PARTS

6-'

INTRODUCTION

Table 6-1. Reference Designators

(Continued)

Table 6-1. Reference Designators

6-3 ORDERING INFORMATION

6-2 This section contains

information

for

ordering

re-

placement parts. Table 6-4 lists parts in alpha-numeric

order

by

reference designators and provides the

following

informa-

tion:

/

6-4

To

order a replacement part, address order''6r in-

quiry

to

your

local Hewlett-Packard

sales

office

(s~~

lists at

rear

of

this manual

for

addresses). Specify

the

following

information

for

each

part:

Model,

complete

serial number,

and any

Option

or

special

modification

(J)

numbers

of

the

instrument;

Hewlett-Packard

part

number;

circuit

reference

designator; and description.

To

order a

part

not

listed

in

Table 6-4, give a

complete

description

of

the part, its func-

tion,

and its

location.

v

= vacuum tube,

neon bulb,
photocell,

etc.

VR

= zener diode

X = socket

Z

= integrated cir-

cu

it

or

network

Table 6-2.

Description

Abbreviations

= plug
= transistor
= resistor

= switch
=

transformer

= terminal

block

= thermal

switch

P

o

R

S

T

TB
TS

A

= ampere

mod. =

modular

or

ac

= alternating

current

modified

assy.

= assembly

mtg

=

mounting

bd = board

n

= nano = 10-

9

bkt

= bracket

NC =

normally

closed

°c

= degree Centigrade

NO =

normally

open

cd

= card

NP

= nickel-plated

coef

=

coefficient

n

=

ohm

comp

=

composition

obd =

order

by

CR.T

= cathode-ray tube

description

CT

= center-tapped

OD

= outside

diameter

dc

=

direct

current

p

=

pico

= 10-

12

DPDT=

double

pole,

P.C.

=

printed

circuit

double

throw

pot. =

potentiometer

DPST=

double

pole,

POp

= peak-to-peak

single

throw

ppm

= parts per

million

elect =

electrolytic

pvr

= peak reverse

encap= encapsulated

voltage

F

= farad

rect =

rectifier

OF

= degree Farenheit rms

=

root

mean square

f~d

=

fixed

Si

= silicon

Ge

= germanium

SPDT= single pole,

H

=

Henry

double

throw

Hz

=

Hertz

SPST = single pole,

IC

= integrated

circuit

single

throw

ID

= inside

diameter

SS

= small signal

incnd = incandescent T =

slow-blow

k

=

kilo

=

10

3

tan. =

tantulum

m

=

milli

= 10-

3

Ti

=

titanium

M

= mega = 10

6

V

=

volt

J1

=

micro

= 10-

6

var = variable

met. = metal

ww

=

wirewound

mfr

=

manufacturer

W

=

Watt

= miscellaneous

electronic

part
= fuse
= jack,

jumper
= relay
=

inductor

= meter

E

F

J

K

L

M

A = assembly

B =

blower

(fan)

C = capacitor
CB

=

circuit

breaker

CR =

diode

DS = device, signal ing

(lamp)

a.

Reference Designators. Refer

to

Table 6-1.

b. Description. Refer

to

Table 6-2

for

abreviations.

c.

Total

Ouantity

(TO).

Given

only

the

first

time

the

part

number

is

Iisted except in instruments

containing

many sub-modular assembl

ies,

in

which

case

the

TO

appears

the

first

time

the

part

number

is

listed in

each

assembly.

d. Manufacturer's Part

Number

or

Type.

e.

Manufacturer's Federal

Supply

Code

Number.

Refer

to

Table 6-3

for

manufacturer's name and address.

f. Hewlett-Packard Part

Number.

g.

Recommended Spare Parts

Quantity

(RS)

for

complete maintenance

of

one

instrument

during

one year

of

isolated service.

h. Parts

not

identified

by

a reference designator

are

listed at the end

of

Table 6-4 under Mechanical

and/or

Miscellaneous. The

former

consists

of

parts belonging

to

and

grouped

by

individual assemblies; the

latter

consists

of

all

parts

not

immediately

associated

with

an

assembly.

6-1

Table 6-3. Code

ListofManufacturers

CODE

MANUFACTURER

ADDRESS

CODE

MANUFACTURER

ADDRESS

00629
00656
00853

01121
01255
01281

01295
01686
01930
02107
02114
02606
02660
02735

Q3508

03797

03877

03888

04009

04072
04213

04404

04713

05277

05347
05820

06001

06004

06486

06540

06555

06666
06751

06776

06812

EBY

Sales

Co., Inc. Jamaica, N.Y.

Aerovox Corp. New Bedford,

Mass.

Sangamo Electric Co.

S.

Carolina Div. Pickens,

S.C.

Allen Bradley Co. Milwaukee,

Wis.

Litton

Ind. Beverly Hills, Calif.

TRW Semiconductors, Inc.

Lawndale, Calif.

Texas Instruments, Inc. Dallas, Texas

RCL Electronics, Inc. Manchester, N.H.
Amerock Corp. Rockford, III.
Sparta Mfg. Co. Dover,

Oh

io
Ferroxcube Corp. Saugerties, N.Y.
Fenwal Laboratories

Morton

Grove, III.

Amphenol Corp. Broadview, III.

Radio Corp.

of

America, Solid State

and

Receiving Tube Div. Somerville, N.J.

G.E. Semiconductor Products Dept.

Sy

racuse,

N.Y.

Eldema Corp. Compton,

Cal

if.

Transitron Electronic Corp.

Wakefield,

Mass.

Pyrofilm

Resistor Co., Inc.

Cedar Knolls, N.J.

Arrow,

Hart

and

Hegeman Electric Co.

Hartford,

Conn.

ADC Electronics, Inc. Harbor

City,

Calif.

Caddell

& Burns Mfg.

Co.

Inc.

Mineola, N.Y.

*Hewlett-Packard Co. Palo

Alto

Div.

Palo

Alto,

Calif.

Motorola Semiconductor Prod. Inc.

Phoenix, Arizona

Westinghouse Electric Corp.

Semiconductor Dept. Youngwood,

Pa.

Ultronix,Inco

Grand

Junction,

Colo.

Wakefield Engr. I

nco

Wakefield,

Mass.

General Elect. Co. Electronic

Capacitor

& Battery Dept. Irmo,

S.C.

Bassik

Div. Stewart-Warner Corp.

Bridgeport, Conn.

I

RC

Div.ofTRW Inc.

Semiconductor Plant Lynn,

Mass.

Amatom

Electronic Hardware Co. Inc.

New Rochelle, N.Y.

Beede

Electrical Instrument Co.

Penacook, N.H.

General Devices Co. Indianapolis, Ind.
Semoor Div. Components, h;c.

Phoenix, Arizona

Robinson N,ugent, Inc.'New Albany,

N.Y.

Torrington Mfg. Co. Van Nuys, Calif.

07137

07138
07263

07387
07397

07716

07910

07933

08484
08530
08717
08730

08806

08863
08919

09021

09182

09213

09214

09353
09922

11115

11236
11237

11502
11711
12136
12615
12617
12697
13103
14493
14655

14936

15801
16299

Transistor Electronics Corp.

Minneapolis, Minn.

Westinghouse Electric Corp. Elmira, N.Y.

Fairchild Camera and Instrument

Mountain View, Calif.

Birtcher Corp., The

Los

Angeles, Calif.

Sylvania Electric Prod. Inc.

Mountainview, Calif.

IRC Div.

of

TRW Inc. Burlington, Iowa

Continental Device Corp.

Hawthorne, Calif.

Raytheon Co. Components Div.

Mountain View, Calif.

Breeze

Corporations, Inc. Union, N.J.

Reliance Mica Corp.

Brooklyn,

N.Y.

Sloan Company, The

Sun

Valley, Calif.

Vemaline Products Co. Inc.

Wyckoff,

N.J.

General Elect. Co. Minature

Lamp Dept. Cleveland, Ohio

Nylomatic

Corp. Norrisville,

Pa.

RCH

Supply Co. Vernon, Calif.

Airco

Speer Electronic Components

Bradford,

Pa.

*Hewlett-Packard Co. New Jersey Div.

Rockaway, N.J.

General Elect. Co. Semiconductor

Prod. Dept. Buffalo, N.Y.

General Elect. Co. Semiconductor

Prod. Dept.

Auburn,

N.Y.

C

& K Components Inc. Newton,

Mass.
Burndy Corp. Norwalk, Conn.
Wagner

Electric

Corp.

Tung-Sol Div. Bloomfield, N.J.

CTS

of

Berne, Inc. Berne, Ind.

Chicago TelephoneofCal. Inc.

So.

Pasadena,

Calif.

IRC Div.

of

TRW Inc. Boone, N.C.

General Instrument Corp. Newark, N.J.
Philadelphia Handle Co. Camden, N.J.
U.S. Terminals, Inc. Cincinnati, Ohio
Hamlin Inc. Lake Mills, Wisconsin
Clarostat Mfg. Co. Inc. Dover, N.H.
Thermalloy Co. Dallas, Texas

*Hewlett-Packard Co. Loveland, Colo.

Cornell-Dubilier Electronics Div.

Federal Pacific Electric Co.

Newark, N.J.

General Instrument Corp. Semicon-

ductor

Prod. Group Hicksville,

N.Y.

Fenwal Elect. Framingham,

Mass.

Corning

Glass

Works Raleigh, N.C.

*Use Code

28480

assignedtoHewlett-Packard Co., Palo

Alto,

California

6-2

Table 6-3. Code

ListofManufacturers

CODE

MANUFACTURER

ADDRESS

CODE'

MANUFACTURER

ADDRESS

Globe-Union Inc.

Fullerton, Calif.

Fenwal, Inc. Ashland,

Mass.

Hughes

Aircraft

Co. Electron

Dynamics Div. Torrance, Calif.

Amperex Electronic

Hicksville,

N.Y.

Bradley Semiconductor Corp.

New Haven, Conn.

Carling Electric, l!lc.

Hartford,

Conn.

Federal Screw Products, Inc.

Chicago, III.
Heinemann Electric Co. Trenton, N.J.
Hubbell Harvey I

nco

Bridgeport, Conn.

Amphenol Corp. Amphenol RF Div.

Danbury, Conn.

E.F. Johnson Co.

Waseca,

Minn.

Thomas and Betts Co. Philadelphia,

Pa.

Union Carbide Corp. New

York,

N.Y.

Ward Leonard Electric Co.

Mt.

Vernon, N.Y.

Amperite Co. Inc. Union

City,

N.J.

Beemer Engrg Co.

Fort

Washington,

Pa.
Belden Corp. Chicago, III.
Bud Radio, Inc. Willoughby, Ohio

Cambridge Thermionic Corp.

Cambridge,

Mass.

Bussmann Mfg. Div.of McGraw &

Edison Co. St. Louis, Mo.

CTS Corp. Elkhart, Ind.

I.T.T. Cannon Electric Inc.

Los

Angeles, Calif.

Milwaukee,

Wis.

General Cable Corp. Cornish

Wire Co. Div. Williamstown,

Mass.

Coto Coil Co. Inc. Providence, R.I.

Chicago Miniature Lamp Works

Chicago, III.

Cinch Mfg. Co. and Howard

B.

Jones Div. Chicago, III.
Dow Corning Corp. Midland, Mich.
Electro Motive Mfg. Co. Inc.

Willimantic, Conn.

Dialight Corp.

Brooklyn,

N.Y.

General Instrument Corp. Newark, N.J.
Drake Mfg. Co. HarwoOd Heights, III.
Elastic Stop

Nut

Div.

of

Amerace

Esna

Corp. Union, N.J.

Erie Technological Products

Erie,

Pa.

Hartford,

Conn.

Hart

Mfg. Co.

Beckman Instruments

71785

73096
73138

73445

72619

72699
72765
72962

71450
71468

71400

70903
71218
71279

71984
72136

72982

73168
73293

70563
70901

59730
61637
63743

73506

73559
73734

74193
74545
74868

71700

74970

71707
71744

·71590

Delco Radio Div.

of

General Motors

Corp.

Kokomo,

Ind.

Atlantic

Semiconductors, Inc.

Asbury Park, N.J.

Fairchild Camera

and

Instrument Corp.

Mountain View, Calif.

Daven Div. Thomas A. Edison Industries

McGraw-Edison Co. Orange, N.J.

Signetics Corp. Sunnyvale, Calif.

Bendix Corp. The Navigation and

Control Div. Teterboro, N.J.

Electra/Midland Corp.

Mineral Wells, Texas

Fansteel Metallurgical Corp.

No. Chicago, III.

Union Carbide Corp. Electronics Div.

Mountain View, Calif.

UID

Electronics Corp.

Hollywood,

Fla.

Pamotor, Inc. Pampa, Texas

General Electric Co. Schenectady,

N.Y.

General Electric Co.

Nela Park, Cleveland, Ohio

General Radio Co.

West

Concord,

Mass.

LTV

Electrosystems Inc. Memcor/Com-

ponents Operations

Huntington,

Ind.

Dynacool Mfg.

Co.

Inc. Saugerties, N.Y.

National Semiconductor Corp.

Santa Clara, Calif.

Hewlett-Packard Co. Palo

Alto,

Calif.

Heyman Mfg. Co.

Kenilworth,

N.J:
IMC Magnetics Corp. Rochester,.!J.H.
SAE Advance Packaging, Inc.

Santa Ana, Calif.
Budwig Mfg. Co. Ramona, Calif.
G.E. Co. Tube Dept. Owensboro,

Ky.

Lectrohm, Inc. Chicago, III.

P.R. Mallory

& Co. Indianapolis, Ind.

Muter Co. Chicago, III.
New Departure-Hyatt Bearings Div.

General Motors Corp.

Sandusky, Ohio
Ohmite Manufacturing Co. Skokie, III.
Penn

Engr. and Mfg. Corp.

Doylestown,

Pa.

Polaroid Corp. Cambridge,

Mass.

Raytheon Co. Lexington,

Mass.

Simpson Electric Co.

Div~

of

American

Gage

and

Machine Co. Chicago, III.

Sprague Electric Co.

North

Adams,

Mass.
Superior Electric Co. Bristol, Conn.
Syntron Div.

of

FMC Corp.

Homer

City,

Pa.

22753
23936
24446
24455

58474
58849

22229

44655

46384

28480
28520
28875
31514

56289

31827
33173
35434
37942

42190
43334

21520

47904

49956

55026

16758

17870

17803

19701

24655
24681

17545

18324

19315

26982
27014

6-3

Table 6-3. Code ListofManufacturers

CODE

MANUFACTURER

ADDRESS

75042

IRC Div.

of

TRW, Inc. Philadelphia,

Pa.

75183

*Howard

B.

Jones Div.ofCinch

Mfg. Corp.

New

York,

N.Y.

75376 Kurz and Kasch, Inc.

Dayton, Ohio

75382 Kilka Electric Corp.

Mt.

Vernon, N.Y.

75915 Littlefuse, Inc.

Des

Plaines, III.

76381

Minnesota Mining

and

Mfg. Co.

St. Paul, Minn.

76385 Minor Rubber

Co.

Inc.

Bloomfield, N.J.

76487

James

Millen Mfg. Co. Inc.

Malden,

Mass.

76493

J.W.

Miller

Co. Compton, Calif.

76530 Cinch

CityofIndustry, Calif.

76854

Oak

Mfg. Co. Div.ofOak

Electro/

Netics Corp. Crystal Lake, III.

77068 Bendix Corp., Electrodynamics Div.

No.

Hollywood,

Calif.

77122 Palnut

Co.

Mountainside, N.J.

77147

Patton-MacGuyer Co.

Providence,

R.1.

77221

Phaostron Instrument

and

Electronic Co.

South

Pasadena,

Calif.

77252

Philadelphia Steel

and

Wire Corp.

Philadelphia,

Pa.

77342

American Machine

and

Foundry Co.

Princeton, Ind.

77630 TRW Electronic Components Div.

Camden, N.J.

77764

Resistance Products Co.

Harrisburg,

Pa.

78189

Illinois Tool Works Inc.

Elgin, III.

78452

Everlook Chicago, Inc. Chicago, III.

78488 Stackpole Carbon Co.

St. Marys,

Pa.

78526

Stanwyck Winding Div.

San

Fernando

Electric Mfg. Co. Inc. Newburgh, N.Y.

78553

Tinnerman Products, Inc. Cleveland, Ohio

78584 Stewart Stamping Corp. Yonkers, N.Y.

79136

Waldes

Kohinoor, Inc.

L.I.C., N.Y.

79307 Whitehead Metals Inc. New

York,

N.Y.

79727 Continental-Wirt Electronics Corp.

Philadelphia,

Pa.

79963

Zierick Mfg. Co.

Mt.

Kisco, N.Y.

80031 Mepco

Morristown, N.J.

80294

Bourns, Inc.

Riverside, Calif.

81042

Howard Industries

Racine, Wisc.

81073

Grayhill, Inc.

La

Grange, III.

81483

International Rectifier

EI

Segundo, Calif.

817'51

Columbus Electronics

Yonkers, N.Y.

82099

Goodyear Sundries

& Mechanical Co. Inc.

New

York,

N.Y.

82142

Airco

Speer

Electronic Components

Du Bois,

Pa.

82219

Sylvania Electric Products Inc.

Emporium,

Pa.

82389

Switchcraft, Inc.

Chicago, III.

82647

Metals and Controls Inc.

Attleboro,

Mass.

*Use Code 71785

assignedtoCinch Mfg. Co., Chicago, III.

6-4

CODE

MANUFACTURER

ADDRESS

82866

Research

Products Corp.

Madison, Wisc.

82877

Rotron Inc.

Woodstock, N.Y.

82893

Vector Electronic Co.

Glendale, Calif.

83058

Carr Fastener Co.

Cambridge,

Mass.

83186

Victory

Engineering

Springfield, N.J.

83298

Bendi x Corp.

Eatontown, N.J.

83330

Herman H. Smith, Inc.

Brooklyn,

N.Y.

83385

Central Screw

Co.

Chicago, III.

83501

Gavitt Wire

and

Cable

Brookfield,

Mass.

83508 Grant Pulley

and

Hardware Co.

West

Nyack, N.Y.
83594 Burroughs Corp. Plainfield, N.J.
83835

U.S. Radium Corp.

rvi'orristown, N.J.

83877

Yardeny Laboratories New

York,

N.Y.

84171

Arco Electronics, Inc.

Great Neck, N.Y.

84411

TRW Capacitor Div.

Ogallala, Neb.

86684

RCA Corp.

Harrison, N.J.

86838

Rummel Fibre Co.

Newark, N.J.

87034 Marco

& Oak Industries

Anaheim, Calif.

87216

Phi

Ico Corp.

Lansdale,

Pa.

87585

Stockwell Rubber Co.

Philadelphia,

Pa.

87929

Tower-Olschan Corp.

Bridgeport, Conn.

88140 Cutler-Hammer Inc.

Lincoln, III.

88245

Litton

Precision Products Inc, USECO

Van Nuys, Calif.

90634

Gulton Industries Inc.

Metuchen, N.J.

90763

United-Car Inc.

Chicago, III.

91345

Miller

Dial

and

Nameplate Co.

EI

Monte, Calif.

91418 Radio Materials Co.

Chicago, III.

91506

Augat, Inc.

Attleboro,

Mass.

91637

Dale

Electronics, Inc.

Columbus, Neb.

91662 Elco Corp.

Willow Grove,

Pa.

91929

Honeywell Inc.

Freeport, III.
92825 Whitso, Inc. Schiller Pk., III.
93332 Sylvania Electric Prod.

Woburn,

Mass.

93410

Essex

Wire Corp.

Mansfield, Ohio

94144

Raytheon Co.

Quincy,

Mass.

94154

Wagner Electric Corp. Livingston, N.J.

94222 Southco Inc.

Lester,

Pa.

95263

Leecraft Mfg. Co. Inc.

L.I.C., N.Y.

95354 Methode Mfg. Co.

Rolling Meadows, III.

95712 Bendix Corp.

Franklin, Ind.

95987

Weckesser

Co. Inc.

Chicago, III.

96791

Amphenol Corp.

Janesville,

Wis.

97464

Industrial Retaining Ring Co.

Irvington, N.J.

97702

IMC Magnetics Corp.

Westbury, N.Y.

98291

Sealectro Corp.

Mamaroneck, N.Y.

98410

ETC Inc.

Cleveland,

Oh

io

98978

International Electronic

Research

Corp.

Burbank, Calif.

99934

Renbrandt, Inc.

Boston,

Mass.

Table 6-4. Replaceable

Parts

REF.

MFR.

DESIG.

DESCRIPTION

TQ*

MFR. PART NO.

CODE

HP

PART NO.

RS

Printed Circuit Board Assy.

Cl

fxd, elect 180pF 50V

2/3

28480

0180-0634

1

C2

fxd, tant 6.8pF

35V

3

150D685X9035B2

56289

0180-0116

1

C3,4

fxd, mylar .0022pF 200V

2

292P22292-PTS

56289

0160-0154

1

C7

fxd, elect 1450pF

45V

2

(Type 68D) D39532 56289

0180-1893

1

C8,9

fxd, cer .05pF 400V

6/4

33C17A3-CDH

56289

0150-0052

1

Cll

fxd, elect 180pF 50V

28480

0180-0634

C12

fxd, tant 6.8pF 35V

150D685X9035B2

56289

0180-0116

C13

fxd, mylar .01pF 200V

2

292Pl0392-PTS

56289

0160-0161

1

C14

fxd, mylar .0033pF 200V

1 292P33292-PTS

56289

0160-0155

1

C17

fxd, elect 1450pF

45V

(Type 68D) D39532 56289

0180-1893

C18,19

fxd, cer .05pF

400V

33C17A3-CDH

56289

0150-0052

C21

6236A

fxd, elect 1000pF 12V

1

28480

0180-0633

1

6237A

fxd, elect 180pF 50V

28480

0180-0634

C22

fxd, tant 6.8pF 35V

150D685X9035B2

56289

0180-0116

C23

fxd, cer .005pF 100V

1

C023B

101

E502MS27 56289

0160-2639

1

C24

fxd, mylar .01pF 200V

292Pl0392-PTS

56289

0160-0161

C27

6236A

fxd,

elect 5600pF 25V

1

(Type 32D) D40018 56289

0180-1921

1

6237A

fxd, elect 3000pF

40V

1

32D5278-DOB

56289

0180-1899

1

C28,

29

6236A

fxd, cer .05pF

400V

33C17A3-CDH

56289

01.50-0052

6237A

Not

used

C30

6236A

Not

used

6237A

fxd, cer O.lpF 500V

1

41

C92B5-CDH 56289

0160-0269

1

C31

6236A

fxd, tant 0.47pF

35V

/

1

150D474X9035A2

56289

0180-0376

1

6237A

fxd, elect 0.15pF

35V

'"

1

Tll0A

154K035AS

61637

0180-0218

1

C32

fxd, mica 330pF 500V

1 obd

72136

0160-2012

1

C33

fxd, elect 490pF 85V

1

(Type 68D) D38618 56289

0180-1888

1

C34

fxd,

mylar O.lpF 250Vac

1

28480

0160-4065

1

CRl

Diode,Si1A 200V

13/15

lN5059

28480

1901-0327

7

CR2-7

Diode,

Si

17

lN485B

28480

1901-0033

7

CR9,11,12,21

Diode,

Si

1A 200V

lN5059

28480

1901-0327

CR22-26

Diode,

Si

1N485B

28480

1901-0033

CR28,29,31,32

Diode,

Si

1A 200V

1N5059

28480

1901-0327

CR41

Diode,Si1.5A 200V

3

1N4999

28480

1901-0416

3

CR42,43

Diode,

Si

1N485B

28480

1901-0033

CR44

Diode, stabistor 150mA 15V

2

STB523

03508

1901-0460

2

CR45-47

Diode,

Si

1N485B

28480

1901-0033

CR49

Diode,

Si

1A 200V

1N5059

28480

1901-0327

CR51,52

Diode,Si1.5A 200V

1N4999

28480

1901-0416

CR53,54

6236A

Not

used

6237A

Diode,Si1A 200V

lN5059

28480

1901-0327

CR55,56

Diode,Si1A 200V

1N5059 28480

1901-0327

CR57

Diode, stabistor 150mA 15V

STB523

03508

1901-0460

CR59

Diode,

Si

1A 200V

1N5059

28480

1901-0327

*6236A/6237A

6-5

Table 6-4. Replaceable

Parts

(Continued)

REF.

MFR.

DESIG.

DESCRIPTION

TQ*

MFA.

PART NO.

CODE

HP

PART NO.

RS

CR60

Diade,5i

1N485B

28480

1901-0033

L1,2

Inductar, ferrite

bead

2

56-590-65/4A6

02114

9170-0894

1

Q2

55

NPN

5i

3

28480

1854-0448

3

Q4

55

PNP

5i

1

2N2904A

04713

1853-0012

1

Q11

Pawer

PNP

5i

1

2N3740

04713

1853-0052

1

Q12

55

NPN

5i

28480

1854-0448

Q13

55

PNP

5i

1 2N4036

28480

1853-0041

1

Q14

55

NPN

5i

1

2N2714A

28480

1854-0027

1

Q15

55

NPN

5i

28480

1854-0448

R2

fxd,

film

2.61k1%1/8W 1

Type MF4C, T-9

19701

0698-0092

1

R3

fxd,

ww

0.1

10%

3W

2

K46505

14841

0811-1827

1

R4

fxd,

camp 185%1/2W

3

EB1805

01121

0686-1805

1

R6

var.

ww

3k

3

Type

11

0-F4

71450

2100-1823

1

R8

fxd,

ww

1.251/2%

5W

2

28480

0811-3384

1

R9

fxd,

film

5.49k 1% 1/8W

1

Type MF4C,T-0

19701

0698-3382

1

R10

fxd,

film

1.5k 1% 1/8W

1

Type MF4C,T-0

19701

0757-0427

1

R11

fxd,

film11Ok

1% 1I8W

2

Type MF4C,

T-O

19701

0757-0466

1

R12

fxd,

film

139 1% 1/8W

3

Type CEA,

T-O

07716

0698-4099

1

R13

fxd, camp 15k

5%

1/2W

1

EB1535

01121

0686-1535

1

R14

fxd, camp 510

5%

1W

1

GB5115

01121

0689-5115

1

R15

fxd, camp 10k

5%

1/2W

2

EB1035

01121

0686-1035

1

R23

fxd,

ww

0.25

10%

3W

1

K46593

14841

0811-1829

1

R24

fxd,

camp 185%1/2W

EB1805

01121

0686-1805

R26

var. ww

3k

Type 110-F4

71450

2100-1823

R28

fxd,

ww

1.25 1/2%

5W

28480

0811-3384

R32

fxd,

film

1391%

1/8W

Type CEA,

T-O

07716

0698-4099

R33

fxd,

film

15k 1% 1/8W

2

Type MF4C,

T-O

19701

0757-0446

1

R34

fxd, camp

5105%

1/2W

1

EB5115

01121

0686-5115

1

R35

fxd, camp 10k

5%

1/2W

EB1035

01121

0686-1035

R42

-

6236A

fxd,

film

8.66k 1% 1/8W

1

Type MF4C, T-9

19701

0698-8076

1

6237A

fxd,

film

2.87k 1% 1/8W

1

Type MF4C-1

19701

0698-7631

1

R43

fxd,

ww

0.1

10%

3W

K46505

14841

0811-1827

R44

fxd, camp 18

5%

1/2W

EB1805

01121

0686-1805

R45

6236A

Nat

used

6237A

fxd,

film

2k 1%1/8W

1

CEA993

07716

0757-0283

1

R46

var.

ww

3k

Type110-F4

71450

2100-1823

R47

6236A

fxd,

film

23k 1%1/8W

1

Type MF4C,

T-O

19701

0698-3269

1

6237A

Nat

used

R48

6236A

fxd,

ww

0.25 1/2%

5W

1

28480

0811-3383

1

6237A

fxd,

ww

0.625 1/2%

5W

1

28480

0811-3395

1

R49

6236A

fxd,

film

750 1%1/8W

1

Type MF4C,

T-O

19701

0757-0420

1

6237A

Nat

used

6-6

Table 6-4. Replaceable

Parts

(Continued)

REF.

MFR.

DESIG.

DESCRIPTION

TQ*

MFR. PART NO.

CODE

HP

PART NO.

RS

R50

6236A

fxd,

film

330 1%1/8W

1

Type MF4C, T-9

19701

0698-5663

1

6237A

fxd,

film

3.83k 1%1/8W

1

Type MF4C·1

19701

0698-3153

1

R51

fxd,

film

110k1%1/8W

Type MF4C,

T-O

19701

0757-0466

R52

fxd,

film

139 1% 1/8W

Type CEA,

T-O

07716

0698-4099

R53

fxd, comp

7.5k5%

1/2W

1

EB7525

01121

0686-7525

1

R54

6236A

fxd,

ww505%

10W

1

Type 247E 56289

0811-1902

1

6237A

fxd,

ww

1355%

10W

1

Type 247E 56289

0811-1905

1

R55

6236A

fxd,

comp 2.2k5%1/2W

1

EB2225

01121

0686-2225

1

6237A

fxd,

comp11k5%1/2W

1

EB1135

01121

0686-1135

1

R56

fxd,

film

270 1%1/8W

1

Type CEA,

T-O

07716

0757-0269

1

R57

fxd,

film

221

k 1% 1/8W

1

Type MF4C,

T-O

19701

0757-0473

1

R58,59

var.

ww

250

2

Type 110

71450

2100-0439

1

R60

fxd,

film

15k 1% 1/8W

Type MF4C,

T-O

19701

0757-0446

R61

fxd,

comp 2405%1/2W

1

EB2415

01121

0686-2415

1

R62

fxd,

film11k 1% 1/8W

2

Type MF4C,

T-O

19701

0757-0443

1

R63

fxd,

film

3.6k2%1/8W

1

Type MF4C,

T-O

19701

0757-0937

1

R64

fxd,

film

11k1%1/8W

Type MF4C,

T-O

19701

0757-0443

R65

fxd,

film

16.2k 1%1/8W

1

Type MF4C,

T-O

19701

0757-0447

1

R66

fxd,

film

470 1%1/4W

1

Type MF52C,

T-O

19701

0698-3506

1

R67

6236A

fxd,

ww

1355%3W

1

Type 242E

56289

0812-0112

1

6237A

fxd,

ww

2205%2W

1

Type

BWH

75042

0811-1763

1

R68

6236A

fxd,

ww

2505%3W

1

Type 242E 56289

0811-1219

1

6237A

fxd,

ww490

5%

3W

1

Type 242E

56289

0811-1801

1

R69

/

'"

6236A

fxd,

ww

1005%10W

1

Type 247E 56289

0811-1903

1

6237A

fxd,

ww

1505%10W

1

Type 247E

56289

0811-1906 1

R70

6236A

fxd,ww405%5W

1

Type 243E

56289

0812-0083

1

6237A

fxd,ww75

5%

5W

1

Type 5XM

14841

0812-0097 1

R71

fxd,

film

471

1%

1!8W

1

Type CMF-55-1,

T-1

91637

0698-5514

1

R72

fxd, comp 33k

5%

1/2W

1

EB3335

01121

0686-3335

1

R73

6236A

Not

used

6237A

fxd, comp

1.1m5%

112W

1

EB1155

01121

0686-1155 1

R74

6236A

(jumper installed)

6237A

fxd,

film

6.98k 1%1/8W

1

Type

CM

F-55-1,

T-1

91637

0698-4470

1

53

sl

ide switch, dual DPDT

1

28480

3101-1914

1

T1

Power Transformer

28480

06236-80091

U1-3

Dual op amp,

IC

3

28480

1826-0092

3

U4

Operational amp, IC

1

LM301AH 27014

1820-0223

1

VR1

Diode, zener 6.2V

1 1N825

28480

1902-1221

1

VR2

Diode, zener 9.09V

1 1N4353B

28480

1902-3149

1

VR3

Diode, zener 7.5V

1

28480

1902-0650

1

Z1

Resistor network

1

28480

1810-0217

1

6-7

Table 6-4. Replaceable Parts (Continued)

REF.

MFR.

DESIG.

DESCRIPTION

TQ*

MFR.

PART

NO.

CODE

HP

PART NO.

RS

Front

Panel

- Electrical

OS1

Indicator light, LINE ON

1

599-237-WHITE

72765

1450-0419

1

M1

6236A

Voltmeter 1

28480

1120-1380

1

6237A

Voltmeter

1

28480

1120-1382

1

M2

6236A

Ammeter

1

28480

1120-1381 1

6237A

Ammeter

1

28480

1120-1383 1

S1

Toggle Switch, LINE

ON

1

7318-PHI

09353

3101-1694

1

S2

3-position rotary switch, METE R

1

28480

3100-1943

1

R1,

R41

var.

10k

2

Series

43

12697

2100-1854 1

Rear

Heat

Sink·

Electrical

F1

Fuse,2A250V (Std. Option

and

Option 100)

1 312002

75915

2110-0002

5

F1

Fuse,

1A 250V (Options 220

and

240)

1 312001

75915

2110-0001

5

01,7

Power

PNP

Si

2

SJ1528

04713

1853-0063

2

03,8

Power

NPN

Si

2

28480

1854-0563

2

Circuit

Ebard

. Mechanical

Heat Oissipator (CR51, 52,

02

in

6236A;02in 6237A) 3/1

207-CB

05820

1205-0033

Heat Sink

(011)

1

28480

5000-6025

Spacer

(for 011 heat sink) 2

28480

0380-0716

Rubber bumper

4

28480

0403-0086

Front

Panel· Mechanical

Binding Post,

red

4

28480

1510-0091

Binding Post, black

1

28480

1510-0107

Hex

nut, nylon,

3/8

-32

5

28480

2950-0144

Meter

bezel

2

28480

4040-0571

Spring, compression (meter mount) 8

28480

1460-0720

Retainer, push-on

(for

OSI)

1

28480

0510-0509

Knob (R1, R41,

S2)

3

28480

0370-1099

Miscellaneous

Bushing, transistor insulator

8

28480

0340-0168

Transistor insulator, mica

4

28480

0340-0174

Fuse

holder

1 342014

75915

1400-0084

Lockwasher, fuseholder

1

28480

2190-0054

Nut, nylon

1/2

- 24

1

28480

2950-0131

Foot, rubber

4

28480

0403-0088

Line cord strain relief

1

28480

0400-0013

Line cord

1

see

par.

2-21

Chassis

assembly,

left

1

28480

5060-7955

Chassis

assembly, right

1

28480

5060-7956

Front

panel (6236A)

1

28480

06236-60001

Front

panel (6237A)

1

28480

06236-60001

Heat sink,

rear

1

28480

5020-8423

Cover,

top

and

bottom

2

28480

5000-9424

Packing carton

1

28480

9211-0848

Floater pad, packing carton

2

28480

9220-1218

6-8

SECTION

VII

CIRCUIT

DIAGRAMS

7-1

COMPONENT

LOCATION

DIAGRAM

7-3

SCHEMATIC

DIAGRAM

7-2

The

component

location

diagram

for

power

supply

Models

6236A

and

6237Ais

given

below.

The

illustration

shows

the

physical

locations

and

reference

designations

of

parts

mountedonthe

printed

circuit

card.

(Notall

parts

are

usedinboth

models.)

7-4 Figure 7-1isa

combined

schematic

diagramofthe

6236A

and

'6237A.The

test

points

(circled

numbers)

shown

on

the

schematic

correspondtothoseonthe

component

location

diagram

andinthe

troubleshooting

procedure

in

Section

V.

The

tinted

areasonthe

schematic

indicate

components

and

jumpers

usedinone

model

only.

Models

6236A

and 6237A,Componen;t Locations

II.

PIN

LOCATIONS

FOR

TRANSISTORS

ARE

SHONN

BELOW:

(TOP VIEWS)

12.

PIN

LOCATIONS

FOR

INTEGRATED CIRCUITS

AND

THE

RESISTOR

NETWORK

ARE

SHOWN

BELOW:

SCHEMATIC NOTES

I.

ALL

COMPONENTS

ARE

LOCATEDONP.C.

BOARD, UNLESS

OTHERWISE

INDICATED.

2.tDENOTES

CHASSIS MOl.tITED

COMPONENTS.

3.

-----

DENOTES

CONSTANT VOLTAGE FEEDBACK

PATH.

4.

---

DENOTES

CURRENT LIMIT

FEEDBACK

PATH.

5.

ALL

RESISTORSINOHMS,

I/BW

1%, UNLESS OTHERWISE INDICATED.

6.

THE

SQUARE

PLATED

PADSONTHE

P.C.

BOARD

INDICATE

ONEOFTHE

FOLLOWING;

A.PIN

1

OFANI.C.ORTRANSFORMER.

B.

POSITIVE

ENDOFA

POLARIZED

CAPACITOR.

C.

CATHOOEOFA

DIODE OR

EMITTEROFA TRANSISTOR.

7.

IN

RESISTOR

NETWORK

Zi:

Z1-J

AND

ZI-K

ARE

MATCHEDTOWITHIN 1%,

AND

Z1-L

AND

Z1-M

ARE

MATCHEDTOWITHIN

0.5%

AND

TRACK

WITHIN

±50

PPM/oC.

8.

FOR

l00VOR120V

OPERATION

USE

A 2A FUSE,HPPART

NO.

21'

0-0002;

FOR

220VOR240V

OPERATION

USE

A 1A FUSE,HPPART

NO.

211

0 -

0001.

9. THE LOCATION

AND

PART

NO.OFR46

IS THE SAME

FOR

MODELS

6236A

AND

6237A

BUT

ITS

ORIENTATIONONTHE BOARD DIFFERS.

'0.

THE TINT

AREASONTHE SCHEMATIC INDICATE COMPONENTS

AND

JUMPERS

THAT

ARE

USED

IN ONE MODEL

ONLY.

7-1

O

B

OC

CO

eE

TO-3

-

-,8l

.2

6-

.3~5.

Ul-U4

(TOP

VIEWS)

m

\:7

PL-5

ZI

~

~

TO-5

TURN-ON/TURN-

OFF

,~----,REFERENCE

AND

BIAS

SUPPLY-----

.......

,,---

CONTROl.

CIRCUIT~

+20V

....

~-

CR41

R43

0.1

10%

3W

C21

+

SEE

TABLE

NOTE

10

FOR
6237A
ONLY

C

22

+ t

fjccw,

fVO[fAGEl

6.8/

R41

~

R5035 V

~~K

OR

SEE 18,5%

VOLTAGE

TABLE 1/2W

+18V

~

R43

R42

CR42

i~~LE

-6.2V

C

Z~

:~~_~

12AV

Q)jD

+7.5V

- -

6.2V

LQJ

~

R62
11K

~

R63

3.6K

VR2

2%,1/8W

VA

9V

R65

16.2K

CR.9

r:;:

R61

R64

240

11K

M

013

vB

R60

015

SD

15K

12.4V

+

C31

;;::
SEE
TAElE

NOTE

NOTE

10

R45

10

FOR

R49

2t<

6237A

6236A

750

ONLY

ONLY

t

R48

I,

SEE

TABLE

r

~ZI-K

1 IIOK
L

;I~W

1

r

lZ1-J

1 IIOK

L

J5%

31/8W

NOT[

7

VRI

62V

R66
470

1/4W

VR3

7.5V

CR461

\.S)

-l

~~5

CR~~

f~OOV

/l~E-~

FYO

U3

12

CUR.COMP

AMPL.

1

~55~

-12.4V P/O

U3

I~iw

1

VOLT.

COMP.

CP5

............

---JI/\/\r---~

AMPL.

yA3

-

--II~51

C24

8 2 1I0K

01

-124V

200VT+75V

R52
139

R47

23K

1

W

JI

R46

~6

...

..--

....,~

~TE"-----"""

[

II

9

~~~

J3

-

~

NOTE

5

cw

9

CR47

CR49

R70
SEE
TABLE

R54
SEE

TABL£

08

'---

DRIVER

'~v.-'A---------O

TO

'1-20 VOLT

REGULATOR----------~,

R55
SEE

TABLE

+C33

~

i'

490

3~3p2F

85V

500V

7~

QI2

CR,5768'

+1,

0--

R67

U4

N~2

----

...

!

SEE

TABLE

~:~~

b,.QII

TABLEf

.

(f

\)

'Y--._--..-..------....--..--

..........

--.+-------4--......L--------

CR51

~

~

TABLE

~

0TO1-6

VOLT

REGULATOR f6236AJ

.......

, J;©

'VA

0TO1-18

VClTREGULATOR

(6237AJ

GYl

......

------1---.~-

....

------------------____1----

....-.....

----____1-~a

OR

~

CR!50

CR52

CR56

"

C30

~V

~R53~+~~~~

6237A

TAB...E

OR.Y

C28

J4

.05

/~

4fX:N

NOTE

10

II'

NOTE
10

C29

FOR

.05

6236A

4(X)J

ONLY

I

1

TI

7

r-=-I

R72
33K

L~

6

5%

C34

J

1/2W

8

,,-.0.1

250V

9;"

I

2

9

3

ZI-A

612

0.5%,1/8W

r--_---:.:..

17

1J1Nr.--'v-',...:.4__-.

Zl-G

~~:

3.26K

TABLE' 1%,1I8W

9---,10

~

-O~O+6V

S~A

(OR+18V)

I

OTO

+20V S2ARI

02

/o----~-flJ

......

o

TO

~

R58

~

VOLTMETER

Zl-H

3

250

WAOJUST

12.26K

""',l/ew

R71

R56

......-__8:=-="

471

270

-20V

....

-------<1'1

6

+6V

OR

+18V

S3

LINE

VOLTAGE

SELECTOR SWITCH

,..---

240V-----,

r--

220V----,

r--120V-----,

r-IOOV....,

L.......o

5

V'D-

S

_

2AR2

-----'

-

,.----METER

CIRCUIT·-----

.....,

+

V MI t

R73

SEE

TABLE

+7.5V

......

--~I\r---

.....

Zl-E

5.!3!~4

-12

.4V

....

-----<~~--

....

1%,I';ew

ZI-B

OT025A

612

(OR

IA)

S2B

.5%,1/8W

0

TO

1

......-_....:..7=--=--=16

r+

O

5A

32

V S2BRI

CR60

:i,~

96.~:f

-12.4V

--+...

I

J

3

--

flJ

CW

R59

~

AMMETER

250

UAOJUST

CRII

RI5
10K
5%
112W

RI4

510

5-.4

IW

-6.2V

R3

0.1
10%
3W

CRI

J1

~-----4.....,J

[2

~

-o5o

V S2BR2

Z~~2C

6

,-

.5%,1/8W

.....--

__

17-+r.N-V\,...,~2--

....

C9

.05

400V

CRI2

..i

CI

T

180
50V

1

Zl-F

251K

1%,1/8W

+

7.5V....

_...;.;8::...+=I\I~VV-:....=2=--_~

CR21

R23

0.25
10%
3W

R28

'3

1.25

t

~~%

[£Q0

)p-

.....

4----------_-~~~~~flJ-C""'URN

..........

P-----

......

~--t---,...-

......

~O

r--~.------..._-_+__1~'MIT

ADJ. W 6

~

'~l

-12.4V

6

fW

r

~Z'-N

r

~~6:

CR24

200~

7 • -

m~

~I:~.

l

,{~~

c.!CII

AMPL. I~1/8W

7

rl'180

1 9 8 + 5

-12.4V

50V

....---,

+7.5V

EJR22

CR23

~5

~~RRITE

5 1

~60~332~~~

5%

BEAD

CR25

~

200V

-

1/2W CR26 1 ,

fJ

~}'

04

~'i'

R33J

GJ7E

10

+~3_-------.._---_.

DRIVER CR28

15K

f ® P/O U2

~24

I~

Z'-L

t7.5V

V~~~p.

CI2

+

r;~W

: I

~~K

6.8

,..r:

l

~

1/4W

35V

~

L---

.....

- ......

---

....

--------------------

.....

----...-----4

...-~O

MODEL

6236A

6237A

CR31

OTOt20

VATOTO

0.5A

o

TO

t20VAT0TO0.5A

13

OUTPUTS

oro

+6VATUPTO

2.5A

o

TO

+18VAT0TOlA

C21

1000

F

12V

18Q.F

50V

~bt-f'

C27

5600,-

F,25V

3000ILF,40V

400V

C31

0.47

F,35V

0.15,.F,35V
14

R42

866K1%

1/8W

2.87K1%118W
CI91

R48

0.25

1/2%,5W

0.625,

1/2%.5W

R50

330

1%,1/8W

3.83K,I%,1/8W

.O~T

R54

50,

5%,IOW

1355%lOW

400V

CR32

R55

2.2K

5%

1/2W

IIK,5%,'/2W

15

R67

1355%3W

2205%

2W

'6

R68

2505%3W

490,5%,3W

r7

CI7

+

R69

1005%lOW 1505%lOW

1450

f'

R70

40,

5%.5W

755%5W

45V

R73

NOT USED

1.1M5%

1/2W

R74

JUMPER

INSTALL

ED

6.98K,

1%

1/8W

Figure

7-1_

Models

6236A

and

6237A,

Schematic Diagram

MANUAL

CHANGES

Models

6236A

and 6237 A

DC

Power Suppl

ies

ManualHPPart No. 5950-1737

Make all corrections in the manual according

to

errata below, then check the

following

table

for

your

power supply serial

number and enter any listed change(s) in the manual.

Model

6236A

SERIAL

MAKE

CHANGES

Prefix

Number

All

-

Errata

1436A

00101-00127

(see

note)

1436A

00128-00140

1

(see

note)

1507A

00141-00350

1,2

1525A

00351-up

1,2,3

Model

6237A

SERIAL

MAKE

CHANGES

Prefix Number

All

-

Errata

1fOllA

00101-00170

1

1526A

00171-up

1,3

NOTE:

This manual appliesto6236A

supplies

with

a serial numjter

prefixof1436A

\,':ith this exception: the

part

number

forR1and

R41

shouldbe2100-3461.

ERRATA:

On

the

title

page,

change the applicable serial numbers

to:

Model

6236A,

Serials

1436A-0010l

and above.

Model 6237A,Serials 1511 A-OOl01and above.

CHANGE

1:

To

the parts Iist and the schematic, add ferrite

bead

inductor

L3,HPPart Number 9170-0894. L3

is·

installed on either

leadofdiode CR49.

CHANGE

2:

This change

to

the Model

6236A

replaces the

printed

circuit

board mounted pots

used

previously

for

R1 and

R41

with

front

panel mounted pots. TheirHPPart Numberis2100-

1854.

CHANGE

3:

Delete

Rl

and

R41

from

the parts list under

Front

Panel

-

Electrical, and add R1 and

R41

(10kD. variable,HPPart

Number 2100-3461) under Printed

Circuit

Board Assembly.

ERRATA:

In

the Exact Commercial Replacement columnofTable 5-8,

and the

Mfr.

Part No. columnofTable 6-4, delete the entries

for

VR2

and

VR3

and insert the

following:

VR2

SZ 10939-170 (Motorola)

VR3

1N4353B

8-26-75

HEWLETT

•

PACKARD,SALES

AND

SERVICE

WORLD WIDE
SALES

&SERVICE OFFICES

UNITED

STATES

ALABAMA

COLORADO

INDIANA MINNESOTA

NEW YORK OKLAHOMA

205

Billy

Mitchell

Road

8290

Whitesburg

Dr.,

S.E.

5600

South

Ulster

Parkway

3839

Meadows

Drive

2400N.Prior

Ave.

6

Automation

Lane

P.O.

Box

32008

San

Antonio

78226

P.O.

Box

4207

Englewood

80110

Indianapolis

46205

Roseville

55113

Computer

Park

Oklahoma City

73132

Tel:

(512)

434-8241

Huntsville

35802

Tel:

(303)

771-3455

Tel:

(317)

546-4891

Tel:

(612)

636-0700

Albany

12205

Tel:

(405)

721-0200

TWX:

910-871-1170

Tel:

(205)

881-4591

TWX:

910-935-0705

TWX:

810-341-3263

TWX:

910-563-3734

Tel:

(518)

458-1550

TWX:

910-830-6862

UTAH

TWX:

810-726-2204

TWX:

710-441-8270

"Birmingham

CONNECTICUT

IOWA MISSISSIPPI

OREGON

2890

South

Main

Street

12

Lunar

Drive

1902

Broadway

"Jackson

New York City

17890SWBoones

Ferry

Road

Salt Lake City

84115

Medical

Service

only

New Haven

06525

Iowa City

52240

Medical

Service

only

Manhattan,

Bronx

Tualatin

97062

Tel:

(801)

487-0715

Tel:

(205)

879-2081

Tel:

(203)

389-6551

Tel:

(319)

338-9466

Tel:

(601)

982-9363

Contact

Paramus,NJOffice

Tel:

(503)

620-3350

TWX:

910-925-5681

ARIZONA

TWX:

710-465-2029

Night:

(319)

338-9467

MISSOURI

Tel:

(201)

265-5000

TWX:

910-467-8714

2336E.Magnolia

SI.

Brooklyn,

Queens,

Richmond

VIRGINIA

FLORIDA

"KANSAS

11131

Colorado

Ave.

Contact

Woodbury,NYOffice

PENNSYLVANIA

"Norfolk

Phoenix

85034

P.O.

Box

24210

~~?r'6)

267-3655

Kansas City

64137

Tel:

(516)

921-0300

111

Zeta

Drive

Medical

Service

only

Tel:

(602)

244-1361

2806W.Oakland

Park

Blvd.

Tel:

(816)

763-8000

201

South

Avenue

Pittsburgh

15238

Tel:

(804)

497-1026

TWX:

910-951-1331

Ft. Lauderdale

33307

TWX:

910-771-2087

Tel:

(412)

782-0400

2424

East

Aragon

Rd.

Tel:

(305)

731-2020

LOUISIANA

Poughkeepsie

12601

Night:

782-0401

P.O.

Box

9854

P.O.

Box

840

148

Weldon

Parkway

iWlJt6-~~t~~~g

2914

Hungary

Springs

Road

Tucson

85706

TWX:

510-955-4099

Maryland Heights

63043

TWX:

710-795-3124

Richmond

23228

Tel:

(602)

889-4661

3239

Williams

Boulevard

"Jacksonville

Kenner

70062

iWPJt6-~~:b~~~

39

Saginaw

Drive

1021

8th

Avenue

Tel:

(804)

285-3431

CALIFORNIA

Medical

Service

only

Tel:

(504)

721-6201

Rochester

14623

KingofPrussia

Industrial

Park

TWX:

710-956-0157

1430

East

Orangethorpe

Ave.

Tel:

(904)

725-6333

TWX:

810-955-5524

NEBRASKA

Tel:

(716)

473-9500

KingofPrussia

19406

WASHINGTON

Fullerton

92631

P.O.

Box

13910

MARYLAND

(Medical

Only)

TWX:

510-253-5981

iWpm-~g~:~~n

8ellefield

Office

Pk.

Tel:

(714)

870-1000

6177

Lake

Ellenor

Dr.

TWX:

910-592-1288

Orlando

32809

6707

Whitestone

Road

11902

Elm

Street

5858

East

Molloy

Road

1203-114th

SE

Tel:

(305)

859-2900

Baltimore

21207

Suite

4C

Syracuse

13211

SOUTH CAROLINA

Bellevue

98004

3939

Lankershim

Boulevard

Tel:

(301)

944-5400

Omaha

6B144

Tel:

(315)

455-2486

6941-0N.Trenholm

Road

Tel:

(206)

454-3971

North Hollywood

91604

TWX:

810-850-0113

TWX:

710-862-9157

Tel:

(402)

333-6017

TWX:

710-541-0482

Columbia

29260

TWX:

910-443-2446

Tel:

(213)

877-1282

21

East

Wright

SI.

4

Choke

Cherry

Road

"NEVADA

1

Crossways

Park

West

Tel:

'(803)

782-6493

"WEST VIRGINIA

TWX:

910-499-2170

S~ite

1

6305

Arizona

Place

Pensacola

32501

Rockville

20850

Las Vegas

Woodbury

11797

TENNESSEE

Charleston

Tel:

(904)

434-3081

Tel:

(301)

948-6370

Tel:

(702)

382-5777

Tel:

(516)

921-0300

"Memphis

Tel:

(304)

345-1640

Los

Angeles

90045

TWX:

710-828-9685

TWX:

510-221-2168

Medical

Service

only

Tel:

(213)

649-2511

GEORGIA

710-828-0487

NEW JERSEY

Tel:

(901)

274-7472

WISCONSIN

TWX:

910-328-6147

P.O.

Box

28234

W.

120

Century

Rd.

NORTH CAROLINA

9431W.Beloit

Road

"Los Angeles

450

Interstate

North

P.O.

Box

1648

Paramus

07652

P.O.

Box

5188

"Nashville

Suite

117

Tel:

(213)

776-7500

Atlanta

30328

2

Choke

Cherry

Road

iWx(2m_~~~:~~g~

1923

North

Main

Street

Medical

Service

only

Milwaukee

53227

iWx(

4gt6_

j~:~~~g

Rockville

20850

High Point

27262

Tel:

(615)

244-5448

Tel:

(414)

541-0550

3003

Scott

Boulevard

Tel:

(301)

948-6370

Tel:

(919)

885-8101

Santa Clara

95050

TWX:

710-828-9684

NEW MEXICO

TWX:

510-926-1516

TEXAS

Tel:

(408)

249-7000

HAWAII

P.O.

BOx

8366

P.O.

Box

1270

TWX:

910-338-0518

2875

So.

King

Street

MASSACHUSETTS

Station

C

OHIO

201E.Arapaho

Rd.

32

Hartwell

Ave.

6501

Lomas

Boulevard

N.E.

16500

Sprague

Road

Richardson

75080

"Ridgecrest

Honolulu

96814

Lexington

02173

Cleveland

44130

iWPJi6-~~j:~m

Tel:

(714)

446-6165

Tel:

(808)

955-4455

Tel:

(617)

861-8960

Albuquerque

87108

Tel:

(216)

243-7300

Tel:

(505)

265-3713

2220

Watt

Ave.

ILLINOIS

TWX:

710-326-6904

TWX:

910-989-1665

~~~~:

l,i?--Il~-~43'

P.O.

Box

27409

Sacramento

95825

(Calculators

Only)

MICHIGAN

6300

Westpark

Drive

Tel:

(916)

482-1463

156

Wyatt

Drive

TWX:

910-367-2092

100S.Wacker

Drive

23855

Research

Drive

Las Cruces

88001

330

Progress

Rd.

Suite

10.0

FOR U.S. AREAS NOT LISTED:

Suite

1100

~~~Tdr3~t~f6~~d

iWl8r

6-§~3:~~~~

Dayton

45449

Houston

77027

Contact

the

regional

office

9606

Aero

Drive

Chicago

60606

Tel:

(513)

859-8202

iWPJ~U~1:~g~g

nearest

you:

Atlanta,

Georgia

..

P.O.

Box

23333

Tel:

(312)

346-9701

TWX:

810-242-2900

TWX:

810-459-1925

North

Hollywood,

California

...

San Diego

92123

5500

Howard

Street

1041

Kingsmill

Parkway

Rockville,(4Choke

Cherry

Rd.)

Tel:

(714)

279-3200

Skokie

60076

Columbus

43229

Maryland

...

Skokie,

Illinois.

TWX:

910-335-2000

Tel:

(312)

677-0400

Tel:

(614)

436-1041

Their

complete

addresses

TWX:

910-223-3613

are

listed

above.

"St. Joseph

"Service Only

Tel:

(217)

469-2133

CANADA

/

ALBERTA

BRITISH COLUMBIA

MANITOBA

NOV4

SCOTIA ONTARIO QUEBEC

Hewlett-Packard

(Canada)

Ltd.

Hewlett-Packard

(Canada)

Ltd.

Hewlell-Packard

(Canada)

Ltd.

Hewlett-Packard

(Canada)

Ltd.

Hewlett-Packard

(Canada)

Ltd.

Hewlett-Packard

(Canada)

Ltd.

Hewlell-Packard

(Canada)

Ltd.

2376

Galvani

Street

11748

Kingsway

Ave.

837E.Cordova

Street

513

Century

SI.

8lltl

Windmill

Road

1785

Woodward

Dr.

275

Hymus

Blvd.

StB-Foy

GIN

4G4

Edmonton

TSG

OX5

Vancouver

V6A

3R2

SI.

James

Dartmouth

B3C

1L1

Ottawa

K2C

OP9

Pointe Claire

H9R

lG7

Tel:

(418)

688-8710

Tel:

(403)

452-3670

Tel:

(604)

254-0531

Winnipeg

R3H

OL8

Tel:

(902)

469-7820

iWx(6m_~~~:~~~g

Tel:

(514)

697-4232

TWX:

610-831-2431

TWX:

610-922-5059

iWl8i6-m:~~~1

TWX:

610-422-3022

Hewlett-Packard

(Canada)

Ltd.

Hewlett-Packard

(Canada)

Ltd.

Tl.X:

05-821521

HPCL

915-42

Avenue

S.E.

Suite

102

6877

Goreway

Drive

Calgary

T2G

lZ1

Mississauga

L4V1L9

FOR CANADIAN AREAS NOTLISTED:

Tel:

(403)

287-1672

Tel:

(416)

678-9430

Contact

Hewlett-Packard

(Canada)

TWX:

610-492-4246

Ltd.inMississauga.

CENTRAL

AND

SOUTH

AMERICA

ARGENTINA

Hewlett-PackardDoBrasil

COLOMBIA

MEXICO PANAMA

PERU

Montevideo

Hewlett-Packard

Argentina

I.E.C.

Ltda.

Instrumentaci6n

Hewlett-Packard

Mexicana,

Electr6nico

Balboa,

SA

Compaiiia

Electro

M~dica

S.A.

Tel:

40-3102

S.A.C.e.1

Praca

Dom

Feliciano,

78-8°

HenrikA.Langebaek&Kier

SA

SAdeC.V.

P.O.

Box

4929

Ave.

Enrique

Canaual

312

Cable:

RADIUM

Montevideo

Lavalle

1171-3°

Piso

andar

(Sal

a

806/8)

Carrera7No.

48-59

Torres

Adalid

No.

21,

11°

Piso

Calle

Samuel

Lewis

San

Isidro

VENEZUELA

Buenos Aires

9000-POrto Alegre-RS

Apartado

Mreo

6287

Col.

del

Valle

Cuidad de Panama

Cas

ilia

1030

Hewlett-PackarddeVenezuela

Tel:

35-0436.

35-0627.

35-0341

Tel:

25-84-70-000

(0512)

Bogota, 1

D.E.

Mexico

12,

D.F.

Tel:

64-2700

Lima

C.A.

Telex:

012-1009

Cable:

HEWPACK

POrto

Alegre

Tel:

45-78-06,

45-55-46

Tel:

(905)

543-42-32

Telex:

3431103

Curunda,

Tel:

22-3900

Apartado

50933

Cable:

HEWPAC

ARG

Hewlett-PackardDoBrasil

~I~:i

:t4~51~~f8~

Telex:

017-74-507

Canal

Zone

Cable:

ELMEDLima

I.E.C.

Ltda.

Hewlett-Packard

Mexicana,

Cable:

ELECTRON

Panama

Edificio

Segre

BOLIVIA

PUERTO RICO

Tercera

Transversal

Stambuk&Mark

(Bolivia)

Ltda.

Rua

SiQueira

Campos,

53.

4°

COSTA RICA

SAdeC.V.

PARAGUAY

San

Juan

Electronics,

Inc.

Los

Ruices

Norte

Av.

Mariscal,

Santa

Cruz

1342

andar

Copacabana

Lie.

Alfredo

Gallegos

Gurdian

Ave.

Constituci6n

No.

2184

Z.J.

Melamed

S.R.L.

P.O.

Box

5167

Caracas

107

La

Paz

2000-Rio de Janelro-GB

Apartado

10159

Monterrey,

N.L.

Division:

AparatosyEQuipos

PoncedeLe6n

154

Tel:

35-00-11

Tel:

40626,

53163,

52421

Tel:

257-80-94-000

(021)

San Jose

Tel:

48-71-32,

48-71-84

Medicos

Pda.

3-PTAdeTierra

Telex:

21146

HEWPACK

Telex:

3560014

Telex:

210079HEWPACK

Tel:

21-86-13

NICARAGUA

Division:

AparatosyEQuipos

San Juan

00906

Cable:

HEWPACK

Caracas

Cable:

BUKMAR

Cable:

HEWPACK

Cable:

GALGUR

San

Jos~

Roberto

Teran

G.

Scientificosyde

Tel:

(809)

725-3342,

722-3342

RiodeJaneiro

Apartado

Postal

689

I

nvestigacion

Cable:

SATRONICS

San

Juan

BRAZIL

CHILE

GUATEMALA

P.O.

Box

676

Telex:

SATRON

3450

332,

FOR AREAS NOT LISTED, CONTACT:

Hewlett-PackardDoBrasil

IPESA

Edificio

Teran

Chile,

482,

Edificio

Victoria

Hewlett-Packard

I.E.C.

Ltda.

CalcagniyMetcalfe

Ltda.

AvenidaLaReforma

3-48,

Managua

Asuncion

URUGUAY

Inter-Americas

Rua

Frei

Caneca,

1.152-Bela

Vista

Calle

Lira

81,

Oficina

5

Zona

9

Tel:

3451,

3452

Tel:

4-5069,

4-6272

Pablo

Ferrando

SA

3200

Hillview

Ave.

01307

-Sao Paulo-SP

Casilla

2118

Guatemala

Cable:

ROTERAN

Managua

Cable:

RAMEL

ComercialeIndustrial

Palo Alto,

California

94304

Tel:

288-71-11,287-81-20,

Santiago

Tel:

63627,

64736

Avenida

Italia

2877

Tel:

(415)

493-1501

287-61-93

Tel:

398613

Telex:

4192

TELTRO

GU

CasilladeCorreo

370

TWX:

910-373-1260

Telex:

309151/213

Cable:

CALM

ET

Cable:

HEWPACK

Palo

Alto

Cable:

HEWPACK

Sao

Paulo

Telex:

034-8300,

034-8493

EUROPE

AUSTRIA

BELGIUM

DENMARK

Hewlett-Packard

A/S

FINLAND FRANCE

Hewlett-Packard

France

Hewlett-Packard

Ges.m.b.H.

Hewlett-Packard

Benelux

Hewlett-Packard

AlS

Navervej

1

Hewlett-Packard

Oy

Hewlett-Packard

France

Agence

R~gional

Handelska

52/3

SA/N.v.

8~~a;t~t~irkerPd

DK-8600

Silkeborg

Nahkahousuntie

5

QuartierdeCourtaboeuf

Chemin

des

Mouilles

P.O.

Box

7

AvenuedeCol-Vert,

"

Tel:

(06)8271

66

P.O.

Box

6

Boite

Postale

NO.6

Boite

Postale

No.

12

A-1205

Vienna

(Groenkraaglaan)

Tel:

[phone]

Telex:

16640hp

as

SF-00211

Helsinki

21

F-91401

Orsay

F-69130

Ecully

Tel:

[phone]to

09

B-1170

Brussels

Cable:

HEWPACK

AS

Cable:

HEWPACK

AS

Tel:

6923031

Tel:

(1)

9077825

Tel:

(78)3381

25,

Cable:

HEWPAK

Vienna

Tel:

(02)

6722240

Telex:

16640hpas

Cable:

HEWPACKOY

Helsinki

Cable:

HEWPACK

Orsay

836525

Telex:

75923

hewpak

a

Cable:

PALOBEN

Brussels

Telex:

12-15363

Telex:

60048

Telex:31617

Telex:23494

paloben

bru