HP 6960A Manuale di servizio

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06960-90002

OPERATING

AND

SERVICE

MANUAL

MODEL

6960A

DC POWER

SUPPLY

Serials Prefixed: G

604

7030 Btlblingen, HerrenbergerstraBe

110,

W.·Germany

Prinleo

8/87

Model 6960 ATable

Contents

List

Illustrations and Tables

TABLE

CONTENTS

Section

Introduction

Instrument Identification " "

General

Description

••

o~."

••

•••••••

oo".".o,,.

1-1

GENERAL

INFORMATION

1-1

1-3

1-5

INSTALLATION

".·.·.·····

2-1

2-3

2-5

Inspection

Power cabIe

115 Vor 230 VOperation

2-1

Remote Sensing

•••••••••.•••.••••••••••••••••

Operating Controls " "

Current Limit Control

Connections to Load

Automatic Parallel Operation

Automatic

Series

Operation

Remote Programming .

3-1

3-3

3-4

OPERATING INSTRUCTIONS

3-1

3-3

3-5

3-7

3-9

3-11

3-13

III

4-1

Overall

Block Diagram .

4-3

Circuit

Description

••••••••••••••••••••••••••

IV PRINCIPLES OF OPERATION ...................... 4-1

4-1

MAINTENANCE

•.•

Introduction

••••••••••••••••••••••••••••••••

General

Maintenance

Information

•••••••••••••

Test Equipment Required

•.••••••••••••••••.••.

Performance

Tests

Detailed

Test Procedure

5-1

5-3

5-5

5-7

5-9

5-11 Trouble Shooting

5-1

5-2

5-5

5-8

Introduction .

Ordering

Information

•••••••••••••••••••••••••

REPLACEABLE

PARTS

6-1

6-4

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

6-1

Model 6960 A

Number

Table

Contents

List

Illustrations

and

Table

LIST

ILLUSTRATIONS

Measuring

line,

load

.••...•••.•.•••....•.....••...

Operating Controls

••...•...••••••••.••.•.••..•.••.

Terminal Connections

•••••••••••••••••

0"0

••••••••••••

Model 6960A Power Supply

1-1

3-1

3-2

4-2

5-1

Block Diagram

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

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

1-1

3-2

3-6

4-1

5-4

5-2

5-3

5-4

5-5

Number

1-1

5-1

5-2

Regulation

and

Ripple

Measuring

Internal Impedance

•••••••••

,.,

•••••••••

Recommended Connections

the

Power Supply

•••••••••

Jv4todel

6960 Circuit

Diagram

••••.••••••••••••••••••••

Servicing

Etched

Circuit

Boards

••..••...•.•...••.....

LIST

TABLES

Specifications

••••••••••••••••••••••••••••••••••••

Recommended

Test

Equipment

•••••••••••••••••••••••

Trouble Location Chart

••••••••••••••••••••••••••••

5-4

5-5

5-9

5-10

1-0

5-2

5-8

Replaceable

Parts

•

6-2

Reference Designator Index

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

6-2

6-5

APPENDICE

Code

List

Manufacturers

Manual Changes

Sales Office Locations

Model

6960

REGULATED OUTPUT:

LOAD REGULATION:

LINE REGULATION:

RIPPLE

AND

NOISE:

TEMPERATURE

STABILITY:

TEMPERATURE

RANGE:

OUTPUT IMPEDANCE:

RECOVERY TIME:

METER

ACCURACY:

OVERLOAD PROTECTION:

OUTPUT TERMINALS:

REMOTE PROGRAMMI

NG:

POWER:

DIMENSIONS:

WEIGHT:

1-0

Specifications

TABLE

1-1

SPECI

FICA

TlONS

ranges

switched

by push

button

switch

0-18

V/600

mA:

Voltage

cantinuously

adjustable

from

0-18

dc.

600

over

entire

valtage

range.

0-36V/3OO mAl

Voltage

continuously

adjustable

from

0-36

dc.

300

over

entire

voltage

range.

Less

than

change

output

voltage

over

full

aperat

range.

Less

than

change

output

voltage

for

±10% power line

changes.

Less

than

150

Vrms •

Less

than

O. 1

%;0

Ot055

Less

than

0.02

Qfrom

Kc.

Less

than

0.5

Qfrom 1

kc.

Less

than

fJs

after

change

from full

10aCl

load.

full scole.(METERS

OPTION

ONLY)

Output

current

imiter

continuously

variable

from

600

0-18

range,

300

0-36

range.

Three banana jacks

spaced

3/4

inch

apart.

Positive and negative terminals are isolated from

chassis. Amaximum of 400 Vmay be

connected

between ground and either output terminal.

About 200

Q/V

external resistance applied to

rear-mounted terminals.

110/220

V:: 10%,

cps,

watts.

115/230

V±10%,

cps,

watts.

6-3/32

inches

(155

mm)

high,

5-1/8

inches

(130

mm)

wide,

inches (279

mm)

deep.

Shipping

Ibs

(4.6

kg)

Model

6960

1-1 Introduction

SECTION I

GENERAL INFORMATION

Section

1-2

This

operoting

and

service

manual far the Madel 6960 A

Power

Supply.

This manual

applicable

only to instruments with the prefix number shown on

the

title

page

except

as modified

change

sheets.

1-3

Instrument

Identification

1-4

Hewlett-Packard

instruments use a

two-section,

eight-cligit

serial

number,

that

is,

000-00000.

The first

three

digits

are

identification

number;

the

last five

digits

are

the instrument

serial

number.

the

identification

number on the

instru-

ment daes not

agree

with

the

identification

number shown on

the

manual

title

page,

there

are

differences

between

the manual and instrument. These

differences

are

described

manuol

chonge

sheets having the prooer

identificotion

number.

1-5

General

Decription

1-6

The

-hp-

Model 6960A

power supply produces a

regulated

voltage

conti-

nuously

adjustable

from 0to 36 Vup to a

current

300 rnA, or from 0to

Vup

to a

current

600

rnA,

according

which

range

has

been

selected

by means

the

front

panel

push

buttons.

The supply makes load

circuit

performance

idepencient

external

power supply

influences,

has

very

low source

impedance

and

excellent

regulation

against

change

line

and

load.

This supply

especially

useful as asource

power for transistor

circuits

because

features

protective

circuit

which

electronically

li;"its

the

maximvm

OUTput

Fig.

1-1 Model 6960A Power Supply

1-1

~i:;;;mmmmmmm:::::::;;;:mmmmmmmm;mmmm;mmm;;m;;m;;

mmmmm;;;,

::i::,Fmm;;mmmm;""""""",,,

:;""",,,,,''': ""'H':::;:.;;'.::;::;:"m:;;';;';';;';;::"':;;';;;1:::::::::::::""="'"''''''"''''

"","'""",=:::,::":::::"',,,,,,::,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,l!I1Iil

IvIode

I6960 ASection 1

current to volues

selected

0front ponel

control.

Accidental damaging of

expensive components

excessive current

can

thus

reduced

to aminimum,

if the

CURRENT

LIMIT

control

set to a

value

just above

the

normal operating

current

the external

circuit.

Another important appl ication

the Model 6960A

Power Supply

electronic

test systems where various fixed voltages have to

produced

sequentially

with ahigh

degree

reproducabil

ity.

This

can be

achieved

because the output

voltage

supply

may

programmed

externally

connected

fixed resistor or aseries

same.

The

output

voltage

will then

pro-

portional to

the

value

this resistor; changing the resistor

predetermined

steps will have corresponding effects on the output

voltoge.

Both

output terminals of the power supply are insulated

from

chassis ground. Either

terminal

may

be grounded as high as 400 V

from

ground.

therefore possible

connect

anumber

supplies in series to obtain higher voltages than 36

more current than 600

needed,

there

the possibi Iity

operating several

power suppl ies in

parallel.

Remote sensing

can

be used for minimizing the

effect

supply lead resistiance

and thus providing an

exactly

regulated

voltage

the

supplied

circuit

regardless

lead

length.

2-0

.................••.•..

_---

Model 6960A

2-1

Inspection

SECTION

INSTALLATION

Section

2-2

When

the

Model

6960A

received,

inspect

for

damage

received

transit.

Operate

the

instrument

make

certain

that

functioning

satisfactorily.

damage

evident,

the

procedures

outlined

the

"CLAIM FOR DAMAGE

SHI

PMENT"

page

this manual (inside

rear

cover).

2-3

Power

cable

2-4

The

three

conductor

power

cable

supplied

with

the

instrument

terminated

in a

three

connector

male power plug recommended by

the

VDE

(Verein Deutscher

Elektrotechniker)

•

WARNING

The

third

conductor

grounds

the

instrument

cabinet

for

the

PROTECTION

OPERATING PERSONNEL.

0two

con-

nector

line

power

receptacle

used,

the

instrument

cabinet

should be

grounded

externally.

2-5

115

Vor

230

VOperation

2-6

The instrument

designed to work from

110,

115

220,

230 volts ±

%line voltage,

shipped

from

the factory wired for operation from a

110

Vor

220

Vsource,

may be

re-wired for operation

from

115

Vor 230 Vline by changing connection on transformer

from

4Ato 4and from 2A

(see

Figure

5-4),

operate

from

220

V(230

line,

set

the slide switch on the rear panel to 230

operate

from

110

(115

V),

set

the

slide switch to

115

Fuse

should be 0.4 Aslow blow for

220

V(230

and

0,8

slow

blow for

110

(115

V),

2-1

Model

6960

SECTION

III

OPERATING INSTRUCTIONS

Section

III

3-1

Operating

Controls

Figure

3-1

shows the functions of

the

front panel controls and terminals and

self-explanatory.

3-2

turn the instrument on, push

either of the range buttons, according to the voltage

and current which

desired. Accidental setting of both buttons,

Vand 36

will

cause

no damage to the unit;

this

case

the instrument has

been

switched to the

V - 300

range. Pushing

the button marked OFF turns

the

instrument off.

3-3

Current

Limit Control

3-4

This knob adjusts the

peak

current output of the supply. The indication

nominal. To

set

the value exactly, remove

the

load

and

short

the

power supply terminals. Adjust the

.!i

....

CURRENT

LIMIT

control until the meter indicates

the

required maximum current.

the

supply

used

application

where

the

current

drown from

the

instrument

not

essentially

unifotm

with

respect

time,

e.g.

in pulse

type

circuits,

then

the

fast

acting

character

the

current

limiting

circuit

must

taken

into

consideration.

The

average

current

may

within

the

supply

rating

below

the

maximum

current

set

with

the

CURRENT LIMIT

control,

but

peak

currents

moy

high

enough

cause

the

supply

clip.

The CURRENT

LIMIT

control

must,

consequently,

set

to a

value

which

greater

than

the

peak

current

requirements

the

circuit.

The

output

terminals

are

connected

internally

200

juF

capacitor

which

helps supply high

current

peaks,

provided

they

are

short

duration.

Any

exter-

nal

capacity

added

will

improve

the

peak

current

capability,

but

will

decrease

the

safety

provided

the

current

Iimit

control.

High

range

currents

may

then

destroy

external

components

before

the

average

current

inside

the

supply

;11'

increases

sufficiently

cause

the

limiting

circuit

operate.

3-1

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