HP 6177B Service manual

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1

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_0

PER

AT!

N G

AND

S E R V

ICE

MAN

U A L

DC

POWER

SUPPLY

CCB

SERIES

MODEL

6177B

•

HEWLETT

Jl:i

PACKARD

=

~----~

DC

POWER

SUPPLY

CCB

SERIES

MODEL 6177B

OPERATING AND

SERVICE

MANUAL

FOR

SERIALS

9C0191

-

0215*

*For

Serials

Below

9C0191

Refer

to

Appendix A

Manual

Backdating

Changes.

*For

serials

above

9C0215

a

Change

Page

may

be

in-

cluded.

100

Locust

Avenue,

Berkeley

Heights,

New

Jersey

07922

HP

Part

No.

06177-90002

Printed:

August,

1969

i}

MANUAL CHANGES

Model

6177B

DC

Power

Supply

Manual

lOP

Part

No.

06177-90002

Make

all

corrections

in

the

manual

according

to

errata

below,

then

check

the

following

table

for

your

power

wi

supply

serial

number

and

enter

any

listed

change(s)

in

the

manual.

SERIAL

MAKE

Prefix

i

Number

CHANGES

9C

0191 -

0275

1

OB

0276

-

0365

1,2

OB

0338,

0339,

1,2,3

0340,

0343,

0346,

0348,

0354,

0356,

0357,

0364

OJ

0366

-

'Jp

1,2,3

ALL

-

Errata

OJ

0426

-

0470

L 2, 3, 4

OJ

0471-0580

1

thru

5

1149A

0581

-up 1

thru

6

CHANGE

I:

Table

5-4,

Step

I

should

read

as

follows:

Remove

CR25

and

CR26 from

circuit

(open).

Open

the

base

lead

of

Q19B.

Disconnect

the

wire

at

point

B

(white

wire).

Refer

to

Component

Location

Diagram,

Figure

7-2.

CF.ANGE 2:

The

serial

number

prefix

of

the

instrument

has

been

changed

from

"9C"

to

"DB".

In

the

Replaceable

Parts

Table,

make

the

following

changes:

Front

Panel

Binding

Post,

White:

Delete,

HP

Part

No.

1510-0067.

Meter

Bezel:

Change

to

lOP

Part

No.

4040-0414.

Connector,

Test

Point,

Pin

Jack,

White:

Add.

HP

Part

No.

1251-2440.

Connector,

Test

Point.

Pin

Plug,

VIlhite:

Add.

HP

Part

No.

1251-2441:

In

the

Replaceable

Parts

Table

and

on

schematic

diagram,

make

the

following

changes:

R5:

Change

to

5.49k,

l/8W,

HP

Part

No.

0698-

3382.

Rl0:

Change

to

5.1k,

tw,

HP

Part

No.

0698-3-644.

R9:

Change

to

270n,

tw, HP

Part

No.

0686-2715.

Q3,6:

Change

to

HP

Part

No.

06177-80001.

R33:

Change

to

2.4K,

tw,

lOP

Part

No.

0686-2425.

R51:

Change

to

SIn,

tw,

lOP

Part

No.

0686-5105.

CR11:

Add,

HP

Part

No.

1901-0461.

Disconnect

the

cathode

of

VR13

from

TP18

and

connect

the

cathode

of

CRl1

to

cathode

of

VR13.

Connect

anode

of

CR11

to

TP18.

Table

5-4;

Step

1

should

read

as

follows:

Remove

jumper

Jl,

connected

to

anode

of

CR26

(point

A).

Disconnect

wire

at

point

B.

Refer

to

Component

Location

Diagram,

Figure

7-2.

CHANGE

3:

The

serial

number

prefix

of

the

instrument

has

been

change

from"

OB"

to

"OJ" .

In

the

Replaceable

Parts

Table

and

on

the

schematic

diagram,

make

the

following

changes:

R70:

Change

to

270n,

~W,

HP

Part

No.

0686-2715.

CR25,CR26,CR33:

Change

to

HP

Part

No.

1901-

0642.

R50: Add, lOOn,

l/8W,

HP

Part

No.

0757-0401.

connected

between

+OUT

and

the

junction

of

CR25

anode.

CR26

cathode,

and

Ql9A

base.

"In

the

Replaceable

Parts

Table,

delete

Q25

(HP

Part

No.

1854-0311)

from

the

Milln

P.

C,

Board.

Add

new

Q25

(HP

Part

No.

1854-0250)

to

the

Chassis

Electri-

cal.

The

new

electrical

connections

of

the

new

025

have

not

been

changed

but

the

transistor

is

now

mounted

on

the

rear

Heat

Sink.

A

boron

nitride

in-

sulator

(HP

Part

No.

0340-0411)

has

been

installed

under

Q25

before

mounting

it

On

the

Heat

Sink.

ERRATA:

On

Page

5-14,

in

Part

B

of

Table

5-10,

change

Step

(b)

to

read:

,jOutput

current

remains

low."

On

the

schematic

diagram,

make

the

following

changes:

Change

the

references

next

to

the

integrated

cir-

cuits

in

the

guard

supply

and

the

main

error

am-

plifier

to

read:

"Z2

(See

Note

11);

Zl

(See

Note

II)!!

respectively.

Change

the

reference

next

to

the

jumpers

in

the

meter

circuit

to

read:

"Note

9.

11

Change

the

positions

of

the

Current

Range

Switch

(S2)

to

read

(from

top):

"500mA,

50mA,

5mA."

Change

the

note

in

the

dotted

box

representing

the

Input

Circuit

Board

in

two

places

on

the

schematic

to

read:

"p/o

Input

P.C.

Board

(06177-60021)."

Change

Note

4

to

read:

"All

components

located

on

main

printed

circuit

board

(06177-60022)

un-

less

otherwise

indicated.

"

In

the

Replaceable

Parts

Table,

make

the

following

changes:

VR6:

Change

rating

to

16.2V,

400mW.

Shoulder

Washer,

insulated:

Add,

qty.

6,

HP

Part

No.

2190-0490.

Bushing

Insulator,

collector

screws,

Q7,

Q29,Q30:

Change

HP

Part

No.

to

0340-0170.

Indian

Bead:

Add, HP

Part

No.

4330-0145.

Used

to

prevent

Ferrite

bead

Ll

from

contacting

c?se

of

transistor

Q2.

P.C.

Board

GUide:

Add,

lOP

Part

No.

0403-0150.

Lampholder

Base,

DSl.

DS2:

Change

to

HP

Part

No.

5040-0305.

Manual

Changes/Model

6177B

Manual

HP

Part

No.

06177-90002

Page

-2-

CF.ANGE 4:

In

the

Replaceable

Parts

Table,

change

C33

to

0.01f'F,

200V, HP

Part

No.

0160-0161.

CHANGE 5:

In

the

Replaceable

Parts

Table

make

the

following

changes:

Q6:

Change

to

HP

Part

No.

1853-0083.

R5:

Change

to

6.2k,

IjBW,

±l

%,

HP

Part

No,

0698-5087.

R14:

Change

to

22k,

tW,

HP

Part

No.

0686-2235.

CHANGE 6:

The

standard

colors

for

this

instrument

are

now

mint

gray

(front

and

rear

panels)

and

olive

gray

:

(for

top.

bottom,

and

side

surfaces).

Option

X95

designates

use

of

the

former

color

scheme

of

light

gray

and

blue

gray.

Option

ASS

designates

use

of

a

light

gray

front

panel

and

olive

gray

for

the

re-

maining

surfaces.

New Part

Numbers

are

shown

below:

I

I DESCRIPTION

I STANDARD

Front

Panel,

Complete

06177-60002

Front

Panel,

Top

Insert

06177-60006

Front

Panel,

Bottom

Insert

06177-60004

Heat

Sink,

Rear

PaDel

5020-8067

Rear

Panel

5000-9461

Cover,

Side

5000-8559

Cover,

Top

5060-8585

Cover

I Bottom

5000-9444

Rack

Kit

(Assy.)

5060-8764

Filler

Panel

(Assy.)

5060-8530

5-1-72

•

HP

PART

NO.

OPTION

A85 OPTION X95 •

<;;

06177-60003

<'

E

Refer

to

(

Manual

Parts

"

List

(-

(

Not

Applicable

Not

Applicable

SECTION

I

GENERAL

INFORMATION

1-1

DESCRIPTION

1-2

This

supply,

is

designed

for

applications

requiring

a

constant

current

source

with

a

high

degree

of

regulation

and

stability

and

very

low

ripple

characteristics.

The

use

of

a

three-posi-

tion

output

RANGE

switch

and

a

lO-tum

output

CURRENT

control

result

in

resolution

down

to

O.5f.,lA.

Special

attention

has

been

given

to

circuit

details

so

that

we

11

regu

1a

ted

perfonnance

is

main-

tained

down

to

very

low

output

currents

-

of

the

order

of

1

t-LA.

1-3

A

special

guard

supply,

within

the

unit,

pro-'-'

vides

a

voltage

which

is

used

to

prevent

internal

leakage

currents

which

would

degrade

the

regula-

tion

characteristics.

Since

the

positive

output

voltage

is

held

equal

to

the

guard

voltage.

it

is

also

used

to

drive

the

front

panel

voltmeter

effec-

tively

isolating

the

voltmeter

from

the

main

supply.

This

prevents

the

usual

output

degradation

associ-

ated

with

connecting

a

voltmeter

across

a

constant

current

supply.

1-4

The

supply

is

completely

transistorized

(all-

silicon)

and

is

suitable

for

either

bench

or

rack

operation.

It

is

of

the

Constant

Current/Voltage

\

Umiting

type

that

will

furnish

full

rated

output

current

at

the

maximum

rated

output

voltage

or

can

be

continuously

adjusted

throughout

the

output

range.

The

front

panel

VOLTAGE

control

is

used

to

establish

the

output

voltage

limit

(ceiling)

when

the

supply

is

used

as

a

constant

current

source.

This

control

is

continuously

variable

throughout

the

entire

voltage

range.

The

front

panel

CURRENT

control

can

be

used

to

establish

the

output

current

limit

(overload

or

shOTt-circuit)

if

the

supply

is

used

as

a

voltage

limited

source.

1-5

A

single

meter

is

used

to

meaSure

either

out-

put

voltage

or

current.

The

dual

selection

is

ac-

complished

by

a METER

switch

on

the

front

panel.

Output

current

can

be

measured

in

one

of

three

ranges

in

accordance

with

the

RANGE

SWitch

set-

ting

on

the

front

panel.

Output

voltage

is

measur-

ed

in

only

one

range.

1-6

The

power

supply

has

both

front

and

rear

ter-

minals.

Either

the

positive

or

negative

output

ter-

minal.may

be

grounded

or

the

power

supply

can

be

operated

floating

at

up

to

a

maximum

of

300

Volts

off

grou'Od

(added

safety

precautions

should

be

1-1

taken

to

protect

the

operator

when

the

supply

is

used

in

this

mode).

1-7

Terminals

at

the

rear

of

the

unit

allow

ac-

cess

to

various

control

points

within

the

unit

to

expand

the

operating

capabilities

of

the

instru-

ment.

A

brief

description

of

these

capabilities

is

given

be

low:

a.

Remote

Programming.

The

power

supply

can

be

programmed

(controlled)

from

a

remote

lo-

cation

by

means

of

an

external

voltage

source

or

resistance.

The

output

current

can

be

rapidly

pro-

grammed

in

the

up

or

down

direction

using

this

technique.

Remote

programming

speed

is

less

than

SOOp.sec

from

zero

to

99%

of

maximum

rated

output

with

an

accuracy

of

1%.

b.

External

Voltage

Monitoring.

The

output

voltage

of

the

supply

can

be

externally

monitored

with

an

accurate

differential

or

digita

1

voltmeter

for

applications

involving

component

testing

or

sorting~

Connecting

the

external

meter

to

the

guard

voltage

prevents

output

performance

degradation

when

this

feature

is

employed.

c.

AC

Modulation

of

Output.

An

external

ac

component

(or

varying

de)

can

be

superimposed

on

the

dc

output

current

of

the

supply.

This

feature

permits

measurement

of

dynamic

impedance.

volt-

age

breakdown.

and

leakage

resistance.

1-8

SPECIFICATIONS

1-9

Detailed

specifications

for

the

power

supply

are

given

in

Table

1-1.

1-10

OPTIONS

1-11

Options

are

factory

modifications

of

a

stan-

dard

instrument

that

are

requested

by

the

customer.

The

following

options

are

available

for

the

instru-

ment

covered

by

this

manual.

Where

necessary.

detailed

coverage

of

the

options

is

included

throughout

't.'1e

manual.

Option

No.

14

28

De

scriPtion

Three

Digit

Graduated

Decadial

Current

Control:

Control

that

re-

places

10-turn

current

control

per-

mitting

resettability

to

within

0.1%.

Rewire

For

230V AC

Input;

Supply

as

normally

shipped

is

wired

for

115Vac

input.

Option

28

consists

of

reconnecting-

the

input

transformer

for

230Vac

operation.

'-12

ACCESSORIES

1-13

The

applicable

accessories

listed

in

the

f01-

lo\ving

chart

may

be

ordered

witt

the

instrument

or

separately

from

your

local

Hewlett-Packard

field

saies

offiCE

(refer

to

list

at

rear

of

manual

for

ad-

cresses).

if

Par.:

No,

5060-0806

5060-0097

DescriDtion

Rack

Kit

for

mounting

one

or

two

units.

(Refer

to

Section

II

for

de-

tails,)

Filler

panel

to

block

unused

half

of

rack

when

mounting

only

one

unit.

1-14 INSTRUMENT IDENTIFICATION

1-15

Hewlett-Packard

instruments

are

identified

1-2

by

a

three-part

serial

number

tag.

The

first

part

is

the

unit

mocie1

nu

mber.

The

second

part

is

the

se-

ria

1

number

prefix,

which

consists

of

a

number-

l.etter

combination

that

denotes

the

date

of

a

Sig-

nificant

design

change.

The

number

designates

the

year,

and

the

letter

A

through

L

designates

the

month,

January

through

December

respectively,

with

1

omitted.

The

third

part

is

the

instrument

serial

number.

1-16

If

the

serial

number

prefix

on

your

unit

does

not

agree

with

the

prefix

on

the

title

page

of

this

manual,

change

sheets

are

included

to

update

the

manual.

Where

applicable.

backdating

information

is

given

in

an

appendix

at

the

rear

of

the

manual.·

1-17

ORDERING

ADDITIONAL

MANUALS

1-18

One

manual

is

shipped

with

each

instrument.

A~ditional

manuals

may

be

purchased

from

your

local

Hewlett-Packard

field

office

(see

list

at

rear

of

this

manual

for

addresses)'

Specify

the

model

number,

serial

number

prefix.

and

@

part

number

provided

on

the

title

page.

•

•

i

I

I

I

I

I

I

!

•

! '

Model

6177B,

Specifications

INPUT:

LOAD TRANSIENT RECOVERY

TIME:

,

115Vac±

10%,

single

phase,

48-63Hz,

0.6

Amp,

Less

than

ZOOjJ.sec

for

output

current

recovery

55

Watts

(nominal).

to

within

1%

of

the

nominal

output

current

fol-

lowing

a

full

load

voltage

change

in

the

output

OUTPUT:

voltage.

0-500mA

@

50

Volts.

METER:

OUTPUT

CURRENT

RANGES:

The

front

panel

meter

can

be

used

as

a

0-3

oo

rnA

,

0-500mA,

0-50mA,

or

O-SmA.

0-30mA,

or

0-3mA

ammeter

or

a

O-120V

voltmeter.

LOAD REGULATION:

OUTPUT

CONTROLS:

Less

than

25pprn

of

output

+

Sppm

of

range

Range

switch

selects

desired

output

current

switch

setting

for

a

full

load

to

no

load

change

range

and

meter/line

switch

controls

input

power

in

output

voltage.

and

selects

meter

range.

Ten-turn

current

and

single-turn

voltage

controls

permit

continuous

LINE REGULATION:

adjustment

over

the

entire

output

span.

Less

than

25ppm

for

any

line

voltage

change

within

the

input

rating.

OUTPUT TERMINALS:

Four

output

posts

are

provided

on

the

front

panel

RIPPLE AND

NOISE:

and

two

output

terminal

strips

are

located

on

the

rear

of

the

chassis.

All

power

supply

output

ter-

Output

Range

Ripple

and

Noise-rms/pk-pk

minals

are

isolated

from

the

chassis

and

either

(rnA)

(de

to

20MHz)

the

positive

or

negative

terminal

maybe

connect'-

ed

to

the

chassis

through

a

separate

ground

ter-

500

40;.cA/250;.cA

minal

located

on

the

front

paneL

50 4;.cA/40;.cA

PROGRAMMING

SPEED:

Less

than

SOO\-lsec

are

required

to

program

from

5 o

.4

;.cA

/ 5

;.cA

zero

and

to

99%

of

the

maximum

rated

output

cur-

rent

0:

each

range

or

between

the

maximum

rated

output

current

of

each

range

to

within

1%

of

zero.

TEMPERATURE RANGES:

Operating:

o

to

5SoC.

Storage:

-40

to

+85

0

C.

REMOTE

PROGRAMMING,

CONSTANT CURRENT:

TEMPERATURE

COEFFICIENT:

Programming

Range

(rnA)

Less

than

75ppm

of

output

plus

Sppm

of

range

Source

500

50

5

switch

setting

per

degree

centigrade.

Resistance

STABILITY:

(Accuracy:

1%

of

Less

than

100ppm

of

output

+

2Sppm

of

range

output

+

0.04%

of

4n/mA

40n/mA

400n/mA

switch

setting

total

drift.

Mea

sured

for

8

hours

range)

after

an

initial

warm-up

time

of

one

hour

at

con-

stant

ambient,

consta

nt

line

volta

ge

t

and

Con-

Voltage

stant

load.

(Accuracy:

0.5%

of

output

+

0.04%

2mV/mA

20mV/mA

200mV/rnA

INTERNAL

IMPEDANCE

AS

A

CONSTANT

of

range)

CURRENT

SOURCE:

~

Output

Range

Output

Impedance

REMOTE

PROGRAMMING,

VOLTAGE

LIMIT:

(rnA)

(R

in

parallel

with

C)*

Remote

programming

of

the

voltage

limit

at

ap-

p'roxirnately

870

ohms

per

Volt

is

made

available

500

R=

3.3

Meg,

C = 0.05fJ.£

at

the

rear

terminals.

50 R = 33

Meg,

C =

O.OO5~f

COOLING:

Convection

cooling

is

employed;

no

moving

parts.

5 R =

330

Meg,

C =

500pf

SIZE:

*The

·formula

Z =

RXe/..JR2

+ Xe2

can

3-7/16"

H x

12-3/8"

D x

7-3/4"

W.

be

used

for

calculations,

up

to

IMHz.

WEIGHT:

10

lbs.

net,

13

lbs.

shipping.

1-3

SECTIOfl'

If

Ir;STALLA

liON

2-1

INITIAL

INSPECTION

2-2

Before

shipment,

this

instrument

was

in-

spectec

and

found

to

be

free

of

mechanical

and

eiectrical

defects.

As

soon

as

the

instrument

is

unpacked,

inspect

for

any

carnage

that

may

have

occurred

in

transit.

Save

all

packing

materials

until

the

inspection

is

completed.

If

damage

is

found,

file

a

claim

for

damage

with

the

shipper.

Hewlett-Packard

Sales

and

Service

Office

should

De

notified.

2-3

MECHANICAL CHECK

2-.s.

This

check

should

confirm

that

there

are

no

broken

knobs

or

connectors,

that

the

cabinet

and

panel

surfaces

are

free

of

dents

anc

scratches,

and

that

the

meter

is

not

scratched

or

cracked.

2-5

ELECTRICAL CHECK

2-6

The

instrument

should

be

checked

against

its

electrical

specifications.

Section

V

includes

an

Hin-cabinet"

performance

check

to

verify

proper

instrument

operation.

2-7

INSTALLATION DATA

2-8

The

instrument

is

shipped

ready

for

bench

operation.

It

is

necessary

only

to

connect,

the

in-

strument

to

a

source

of

power

and

it

is

ready

for

operation.

2-9

LOCATION

2-10

This

instrument

is

air

cooled.

Sufficient

space

should

be

allotted

so

that

a

free

flow

of

coolin~

air

can

reach

the

sides

and

rear

of

the

in-

strument

when

it

is

in

operation.

It

should

be

used

in

an

area

where

the

ambient

temperature

does

not

!=-xceed

50°C.

2-11

OUTLINE DIAGRAM

2-12

Figure

2-1

illustrates

the

outline

shape

and

dimensions

of

the

6177B

and

6181B

supplies.

2-13

RACK

MOUNTING

2-14

This

instrument

may

be

rack

mounted

in

a

standard

19

inch

rack

panel

either

alongside

a

sim-

ilar-unit

or

by

itself.

Figure

2-2

shows

how

both

2-1

Figure

2-1.

Outline

Diagram

types

of

installations

are

accomplished.

2-15

To

mount

one,

or

two

units

side-by-side,

proceed

as

follows:

a.

Place

adaptor

frame

on

bench.

b.

Remove

feet

from

submodular

instruments.

Place

instrument(s)

in

frame.

c.

Place

divider

clamps

between

instruments.

d.

Place

divider

c

lamps

in

position

on

each

end

and

push

the

instrument

combination

into

frame.

e.

Insert

screws

on

either

side

of

frame

and

tighten.

Figure

2-2.

Rack

Mounting

One

and

Two

Units

•

•

,

2-16

INPUT

POWER

REQUIR"M"II:TS

2-17

This

power

supply

may

be

operated

from

either

2.

nominal

115

Volt

or

230

Volt

4S-63Hz

pow-

er

source.

The

unit,

as

shipped

from

the

factory,

is

wirec.

for

115

Volt

operation.

The

input

power

required

when

operated

irom

a

115

Volt

60Hz

power

sourCE

at

full

load

is

55

Vlatts

and

0.6

Ampere.

2-18

CONNECTIONS

FOn

230

VOLT OPERATION

(Figure

2-3)

.~

I !

ip

b

JI

FI o

P/O

SI

01

TRANSFORMER

PRIMARY

CONNECTIONS

FOR

230V

OPERATION.

Figure

2-3.

Primary

Connections

TI

2-19

Normally,

the

two

primary

windings

of

the

input

transformer

are

connected

in

paranei

for

op-

eration

from

115

Volt

source,

To

convert

the

power

supply

to

operation

from a 230

Volt

source,

the

power

transformer

windings

are

connected

in

series

as

follows:

a.

Unplug

the

line

cord

and

remove

the

bot-

tom

cover

from

the

unit.

2-2

b.

Unsoider

jumper

between

taps

1

and

3

and

taps

2

and

4.

These

taps

are

shown

in

Figure

2-4,

and

are

located

on

the

bottom

of

the

unit.

c.

Solder

jumper

between

taps

2

and

3.

d.

Replace

existing

fuse

with

0.5

Ampere,

230

Volt

fuse.

Replace

cover

and

operate

unit

normally.

2-20

POWER CABLE

2-21

To

protect

operating

personnel,

the

National

Electrical

Manufacturers

Association

(NEMA)

rec-

ommends

that

the

instrument

panel

and

cabinet

be

grounded.

This

instrument

is

equipped

with

a

three

conductor

power

cable.

The

third

conductor

is

the

ground

conductor

and

when

the

cable

is

plugged

into

an

appropriate

receptacle,

the

instru-

ment

is

grounded.

The

offset

pin

on

the

power

cable

three-prong

connector

is

the

ground

connec-

tion.

2-22

To

preserve

the

protection

feature

when

op-

erating

the

instrument

from

a

Mo-contact

outlet,

use

a

three-prong

to

two-prong

adapter

and

con-

nect

the

green

lead

on

the

adapter

to

ground.

2-23

REPACKAGING

FOR

SHIPMENT

2-24

To

insure

safe

shipment

of

the

instrument,

it

is

recommended

that

the

package

designeci

for

the

instrument

be

usee.

The

original

packaging

mate-

erial

is

reusable.

If

it

is

not

available,

contact

your

local

Hewlett-Packard

field

office

to

obtain

the

materials.

This

office

will

also

furnish

the

ad-

dress

of

the

nearest

service

office

to

which

the

in-

strument

can

be

shipped.

Be

sure

to

attach

a

tag

to

the

instrument

which

specifies

the

owner,

model

number,

full

seria

1

number,

and

service

required,

or

a

brief

description

of

the

trouble.

SECTION

III

OP:::RATING

INSTRUCTIONS

61778

DC

CURRENT

SOURCE

HEWlETT<>PACK,o..RD

D-50V

Figure

3-1.

Operating

Controls

and

Indicators

3-1 TURN-ON CHECKOUT

PROCEDURE

3-2

The

following

checkout

procedure

describes

the

use

of

the

front

panel

controls

and

indicators

and

ensures

that

the

meter

and

programming

cir-

cuits

are

operable.

Actual

outpu:

current

should

be

checked

with

an

external

ammeter

before

con-

necting

delicate

loads.

a.

Set

line/meter

switch

(1)

to

VOLTS

and

observe

that

UNE

light

(2)

goes

on.

b.

To

select

voltage

limit,

adjust

VOLTAGE

control

(3)

until

front

panel

meter

(4)

indicates

desired

output

voltage

(no

load

connected).

c.

VOLTAGE

UMIT

lamp

(5)

sho.uld

be

on

with

no

load

connected.

d.

To

select

constant

current

output.

tum-

off"supply

and

short

+

and

-

output

terminals

(front

3-1

or

rear).

e.

Set

switch

(1)

to

AMPS

and

select

de-

sired

output

current

range

with

range

switch

(6).

Adjust

CURRENT

control

(7)

for

desired

output

cur-

rent.

=.

Remove

short

and

connect

load

to

output

termina

Is

(front

or

rear).

3-3

OPERATING

MODES

3-4

The

power

supply

is

designed

so

that

its

mode

of

operation

can

be

selected

by

making

strapping

connections

between

particular

terminals

on

the

terminal

strips

at

the

rear

of

the

power

sup-

ply.

The

terminal

designations

are

stenciled

in

white

on

the

power

supply

above

or

below

their

•