HP BENCH Series Service manual

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DC

POWER

SUPPLY

BENCH

SERIES

MODEL

6215A

OPERATING

AND

SERVICE

MANUAL

FOR

SERIALS

8G250I

-

4200

For

Serials

Above

8G4200

Check

for

inclusion

of

change

page.

For

Serials

Below

8G2

501

Refer

to

Appendix

A.

100

Locust

Avenue,

Berkeley

Heights,

New

Jersey

07922

HP

Part

No.

06215-90001

Printed:

January,

1969

TABLE

OF

CONTENTS

Section

Page

No.

I

GENERAL

INFORMATION

1-1

1-1

Description

1-1

1-5

Specifications

1-1

1-7

Options

1-1

1-9

Accessories

1-1

1-11

Instrument/Manual

Identification

1-1

1-14

Ordering

Additional

Manuals

1-1

Section

page

No.

IV

PRINCIPLES

OF

OPERATION

(CONTINUED)

II

INSTALLATION

2-1

Initial

Inspection

Mechanical

Check

Electrical

Check

Installation

Data

Location

2-11

Outline

Diagram

2-13

Rack

Mounting

2-15

Input

Power

Requirements

Connections

for

230V

Operation

Power

Cable

2-3

2-5

2-7

2-9

2-17

2-19

2-22

Repackaging

For

Shipment

111

OPERATING

INSTRUCTIONS

2-1

2-1

2-1

2-1

2-1

2-1

2-1

2-1

2-2

2-2

2-2

2-2

3-1

3-1

Turn-On

Checkout

Procedure

3-1

3-3

Operation

3-1

3-5

Constant

Voltage

3-1

3-7

Changing

Current

Limit

3-1

3-9

Connecting

Load

3-1

3-12

Operation

of

Supply

Beyond

Rated

Output

3-2

3-14

Optional

Operating

Modes

3-2

3-15

Series

Operation

3-2

3-17

Parallel

Operation

3-2

3-19

Special

Operating

Considerations

3-2

3-20

Pulse

Loading

3-2

3-22

Output

Capacitance

3-2

3-24

Reverse

Current

Loading

3-2

PRINCIPLES

OF

OPERATION

4-1

4-1

Simplified

Discussion

4-1

4-5

Detailed

Circuit

Analysis

4-2

4-6

Feedback

Loop

4-11

Series

Regulator

4-13

Constant

Voltage

Input

Circuit

4-17

Driver

and

Error

Amplifier

4-20

Current

Limiting

Circuit

4-22

Reference

Circuit

4-2

6

Meter

Circuit

V

MAINTENANCE

5-1

Introduction

5-3

Cover

Removal

and

Replacement

5-6

General

Measurement

Technique

5-11

Test

Equipment

Required

5-13

Performance

Test

5-15

Rated

Output

and

Meter

Accuracy

5-18

Load

Regulation

5-20

Line

Regulation

5-35

Output

Impedance

5-38

Current

Limit

5-40

Transient

Recovery

Time

5-46

Troubleshooting

5-48

Trouble

Analysis

5-53

Repair

and

Replacement

5-55

Adjustment

and

Calibration

5-57

Meter

Mechanical

Zero

5-59

Meter

Calibration

5-61

Zero

Volts

Output

Adjustment

5-63

Output

Current

Limit

Adjustment

VI

REPLACEABLE

PARTS

6-1

Introduction

6-4

Ordering

Information

Reference

Designators

Abbreviations

Manufacturers

6-8

Code

List

of

Manufacturers

Parts

List

Table

4-2

4-2

4-2

4-3

4-3

4-3

4-3

5-1

5-1

5-1

5-1

5-2

5-3

5-3

5-3

5-3

5-6

5-7

5-7

5-8

5-8

5-11

5-13

5-13

5-13

5-13

5-13

6-1

6-1

6-1

6-2

APPENDK

A

A-1

MANUAL

CHANGES

DC

POWER

SUPPLY

Model

6215A

Manual

Serial

Number

Prefix

8M

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.

SERIAL

MAKE

CHANGES

Prefix

Number

9C

4201

-

4450

1

ALL

-

Errata

9C

4451

-

up

1,2

CHANGE

1:

In

replaceable

parts

table,

make

the

following

change:

R12:

Change

to

IKn.

±5%

3W,

Part

No.

0813-

0001.

ERRATA:

On

Page

5-4,

Figure

5-5,

change

Rl

for

Models

6215A

and

6216A

to

62.5,^..

Change

Paragraph

3-18,

third

sentence

to

read

as

follows:

"The

output

of

each

power

supply

can

be

set

separately."

CHANGE

2:

In

replaceable

parts

table,

make

the

following

change:

R28:

820^,

±5%,

^W,

($

Part

No.

0686-8215.

ERRATA:

On

the

Title

Page,

change

the

serial

number

in

formation

to

read:

"FOR

SERIALS

8G2501-4200.

For

Serials

Below

8G2501,

Refer

to

Appendix

A."

4-27-70

TABLE

OF

CONTENTS

(CONTINUED)

LIST

OF

TABLES

Table

I-I

5-1

5-2

5-3

Specifications

Test

Equipment

Required

Common

Troubles

Reference,

Bias,

and

Filtered

DC

Troubl

e

s

hooting

Page

No.

1-2

5-2

5-9

5-10

Table

5-4

5-5

5-6

5-7

Low

Output

Voltage

Troubleshooting

High

Output

Voltage

Troubleshooting

Selected

Semiconductor

Characteristics

Calibration

Adjustment

Summary-

Page

No.

5-10

5-11

11

13

LIST

OF

ILLUSTRATIONS

Figure

1-1

2-1

2-2

2-3

3-1

4-1

5-1

5-2

DC

Power

Supply

Outline

Diagram

Page

No.

i

V

2-1

Rack

Kit

with

Three

BENCH

Supplies

2-1

Input

Power

Transformer

Connections

2-2

Front

Panel

Controls

and

Indicators

3-1

Simplified

Schematic

4-1

Front

Panel

Terminal

Connections

5-1

Output

Current

Measurement

Technique

5-1

Figure

Page

No.

5-3

Differential

Voltmeter

Substitute

Test

Setup

5-3

5-4

Output

Current,

Test

Setup

5-3

5-5

Load

Regulation,

Test

Setup

5-4

5-6

Ripple

and

Noise,

Test

Setup

5-5

5-7

Noise

Spike

Test

Setup

5-6

5-8

Output

Impedance,

Test

Setup

5-6

5-9

Transient

Recovery

Time,

Test

Setup

5-7

5-10

Transient

Recovery

Time,

Waveforms

5-8

5-11

Servicing

Printed

Wiring

Boards

5-12

iii

f

&

AMOEffCS

toym

mTAGE

COARSr

flNg

•S«

"'^5|i'

^'ll

W.TtR

StU-C

ON

HEW!,gTT^^PACftA(tD

^KJiTS^SI

<

^

mtA

mftm

sum,*

^

9

o,

•

o~|;

,

.

VOl.TA(^

•.3-

-

f.

te

l^:

Figure

1-1.

DC

Power

Supply

iv

SECTION

I

GENERAL

INFORMATION

1-1

DESCRIPTION

1-2

This

power

supply,

Figure

1-1.

is

completely

transistorized

and

suitable

for

either

bench

or

relay

rack

operation.

It

is

a

compact,

regulated.

Con

stant

Voltage/Current

Limiting

supply.

The

output

voltage

can

be

continuously

adjusted

throughout

the

output

voltage

range.

The

power

supply

is

fully

pro

tected

from

overloads

by

a

fixed

current

limit

which

is

set

by

means

of

an

internal

adjustment.

The

cur

rent

limit

circuit

permits

series

and

parallel

connec

tion

of

two

or

more

supplies

when

greater

voltage

or

current

is

desired.

1-3

Either

the

positive

or

negative

output

terminal

may

be

grounded

or

the

power

supply

can

be

opera

ted

floating

at

up

to

a

maximum

of

300

volts

off

ground.

1-4

A

single

meter

is

used

to

measure

either

out

put

voltage

or

output

current

in

volts

and

milliamps,

respectively.

The

voltage

or

current

range

is

selec

ted

by

the

METER

switch

on

the

front

panel.

1-5

SPECIFICATIONS

1-6

Detailed

specifications

for

the

power

supply

are

given

in

Table

1-1.

1-7

OPTIONS

1-8

Options

are

factory

modifications

of

a

stand

ard

instrument

that

are

requested

by

the

customer.

The

following

options

are

available

for

the

instru

ment

covered

by

this

manual.

Where

necessary,

de

tailed

coverage

of

the

options

is

included

through

out

the

manual.

Option

No.

Description

28

230Vac,

50-400Hz,

Single-Phase

Output:

Factory

modification

consists

of

reconnecting

the

input

transformer

for

230Vac

operation.

Refer

to

Section

II

for

further

details.

1-9

ACCESSORIES

1-10

The

accessories

listed

in

the

following

chart

may

be

ordered

with

the

power

supply

or

separately

from

your

local

Hewlett-Packard

field

sales

office

(refer

to

list

at

rear

of

manual

for

addresses).

(fe

Part

No.

Description

1452lA

3|-"

High

Rack

Kit

for

mounting

up

to

three

BENCH

supplies.

(Refer

to

Sec

tion

II

for

details.)

14522A

7"

High

Rack

Kit

for

mounting

up

to

six

BENCH

supplies.

(Refer

to

Sec

tion

II

for

details.)

1-11

INSTRUMENT/MANUAL

IDENTIFICATION

1-12

Hewlett-Packard

power

supplies

are

identified

by

a

three-part

serial

number

tag.

The

first

part

is

the

power

supply

model

number.

The

second

part

is

the

serial

number

prefix,

which

consists

of

a

num

ber-letter

combination

that

denotes

the

date

of

a

significant

design

change.

The

number

designates

the

year,

and

the

letter

A

through

L

designates

the

month,

January

through

December

respectively.

The

third

part

is

the

power

supply

serial

number.

1-13

If

the

serial

number

prefix

on

your

power

sup

ply

does

not

agree

with

the

prefix

on

the

title

page

of

this

manual,

change

sheets

are

included

to

up

date

the

manual.

Where

applicable,

backdating

information

is

given

in

an

appendix

at

the

rear

of

the

manual.

1-14

ORDERING

ADDITIONAL

MANUALS

1-15

One

manual

is

shipped

with

each

power

sup

ply.

Additional

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

($i

stock

number

provided

on

the

title

page.

1-1

Table

1-1.

Specifications

INPUT:

105-125Vac,

single

phase,

50-400Hz.

OUTPUT:

0-25Vdc,

0-400mA.

LOAD

REGULATION:

Less

than

0.01%

plus

ImV

for

a

full

load

to

no

load

change

in

output

current.

LINE

REGULATION:

Less

than

0.01%

plus

4mV

for

any

line

voltage

change

within

the

input

rating.

RIPPLE

AND

NOISE:

Less

than

200|j.Vnns/lmV

p-p

(dc

to

20MHz).

TEMPERATURE

RANGES:

Operating:

0

to

55°C.

Storage:

-40

to

+85°C.

TEMPERATURE

COEFFICIENT:

Less

than

0.02%

plus

ImV

per

degree

Centi

grade.

STABILITY:

Less

than

0.10%

plus

5mV

total

drift

for

8

hours

after

an

initial

warm-up

time

of

30

minutes

at

constant

ambient,

constant

line

voltage,

and

constant

load.

INTERNAL

IMPEDANCE

AS

A

CONSTANT

VOLT

AGE

SOURCE:

Less

than

0.03

ohms

from

dc

to

IkHz.

Less

than

0.5

ohms

from

IkHz

to

lOOkHz.

Less

than

3.0

ohms

from

lOOkHz

to

IMHz.

TRANSIENT

RECOVERY

TIME:

Less

than

50[j.sec

for

output

recovery

to

within

lOmV

following

a

full

load

current

change

in

the

output.

OVERLOAD

PROTECTION:

A

fixed

current

limiting

circuit

protects

the

power

supply

for

all

overloads

including

a

direct

short

placed

across

the

output

terminals

in

con

stant

voltage

operation.

METER:

The

front

panel

meter

can

be

used

as

either

a

0-30V

voltmeter

or

as

a

0-500mA

ammeter.

OUTPUT

CONTROLS:

Coarse

and

fine

voltage

controls

set

desired

output

voltage.

Meter

switch

selects

voltage

or

current.

OUTPUT

TERMINALS:

Three

"five-way"

output

posts

are

provided

on

the

front

panel

All

power

supply

output

terminals

are

isolated

from

the

chassis

and

either

the

posi

tive

or

negative

terminal

may

be

connected

to

the

chassis

through

a

separate

ground

terminal

located

on

the

output

terminal

strip.

COOLING:

Convection

cooling

is

employed.

The

supply

has

no

moving

parts.

SIZE:

5i"/13,34cm

W

x

3i"/8,26cm

H

x

7"/l7„78cm

D.

Using

a

Rack

Mounting

Kit,

three

units

can

be

mounted

side

by

side

in

a

standard

19"

relay

rack.

■WEIGHT:

5.25

lbs./2,38

kg.

net,

71bs./3,17kg.

shipping.

FINISH:

DarkCray

POWER

CORD:

A

three-wire,

five-foot

power

cord

is

provided

with

each

unit.

1-2

SECTION

II

INSTALLATION

mnTTTTm

-

REAR

Figure

2-1.

Outline

Diagram

2-1

INITIAL

INSPECTION

2-2

Before

shipment,

this

instrument

was

inspec

ted

and

found

to

be

free

of

mechanical

and

electri

cal

defects.

As

soon

as

the

instrument

is

unpacked,

inspect

for

any

damage

that

may

have

occurred

in

transit.

Save

all

packing

materials

until

the

in

spection

is

completed.

If

damage

is

found,

proceed

as

described

in

the

Claim

for

Damage

in

Shipment

section

of

the

warranty

page

at

the

rear

of

this

manual.

2-3

MECHANICAL

CHECK

2-4

This

check

should

confirm

that

there

are

no

broken

knobs

or

connectors,

that

the

cabinet

and

panel

surfaces

are

free

of

dents

and

scratches,

and

that

the

meter

is

not

scratched

or

cracked.

2-5

ELECTRICAL

CHECK

2-6

The

instrument

should

be

checked

against

its

electrical

specifications.

Section

V

includes

an

"in-cabinet"

performance

check

to

verify

proper

in

strument

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

cooling

air

can

reach

the

rear

of

the

instrument

when

it

is

in

operation.

It

should

be

used

in

an

area

where

the

ambient

temperature

does

not

ex

ceed

550c.

2-11

OUTLINE

DIAGRAM

2-12

Figure

2-1

illustrates

the

outline

shape

and

dimensions

of

Models

62I3A

through

62I8A.

2-13

RACK

MOUNTING

2-14

This

instrument

may

be

rack

mounted

sepa

rately

or

with

a

maximum

of

two

other

BENCH

Series

supplies

as

shown

in

Figure

2-2.

The

Figure

2-2.

Rack

Kit

with

Three

BENCH

Supplies

2-1

units

are

placed

in

the

Rack

Mounting

Frame.

The

Rack

Mounting

Frame

is

then

fastened

to

the

rack

frame.

2-15

INPUT

POWER

REQUIREMENTS

2-16

This

power

supply

may

be

operated

continu

ously

from

either

a

nominal

115

Volt

or

230

Volt

50-400HZ

power

source.

The

unit

as

shipped

from

the

factory,

is

wired

for

115

Volt

operation.

The

input

power

required

when

operated

from

a

115

Volt

power

source

at

full

load

is:

Model

Input

Current

6213A

and

6214A

0.29A

6215A

and

6217A

0.25A

6216A

and

6218A

0.25A

Input

Power

28W

26W

26W

2-17

CONNECTIONS

FOR

230

VOLT

OPERATION

(Figure

2-3)

2-18

Normally,

the

two

primary

windings

of

the

input

transformer

are

connected

in

parallel

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

top

cover

as

described

in

Paragraph

5-3.

b.

Remove

the

jumpers

between

taps

4-2

and

3-1.

Solder

a

jumper

between

taps

3-2

on

the

input

power

transformer

Tl,

see

Figure

2-3.

c.

Replace

existing

fuse

with

a

0.5

Ampere,

230

Volt

fuse.

d.

Replace

existing

line

cord

plug

with

a

standard

230

Volt

plug.

2-19

POWER

CABLE

2-20

To

protect

operating

personnel,

the

National

Electrical

Manufacturers

Association

(NEMA)

recom

mends

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

TRANSFORMER

PRIMARY

CONNECTED

FOR

115-VOLT

OPERATION

TRANSFORMER

PRIMARY

CONNECTED

FOR

230-VOLT

OPERATION

Figure

2-3.

Input

Power

Transformer,

Connections

into

an

appropriate

receptacle,

the

instrument

is

grounded.

The

offset

pin

on

the

power

cable

three-

prong

connector

is

the

ground

connection.

2-21

To

preserve

the

protection

feature

when

oper

ating

the

instrument

from

a

two-contact

outlet,

use

a

three-prong

to

two-prong

adapter

and

connect

the

green

lead

on

the

adapter

to

ground.

2-22

REPACKAGING

FOR

SHIPMENT

2-23

To

insure

safe

shipment

of

the

instrument,

it

is

recommended

that

the

package

designed

for

the

instrument

be

used.

The

original

packaging

mate

rial

is

reusable.

If

it

is

not

available,

contact

your

local

Hewlett-Packard

field

otfice

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

serial

number,

and

service

required,

or

a

brief

description

of

the

trouble.

2-2

SECTION

III

OPERATING

INSTRUCTIONS

3-1

TURN-ON

CHECKOUT

PROCEDURE

3-5

CONSTANT

VOLTAGE

3-2

The

following

checkout

procedure

describes

the

use

of

the

front

panel

controls

and

indicators

and

ensures

that

the

supply

is

operational;

a.

Set

AC

toggle

switch

(1)

upward

to

on

position;

indicator

(2)

should

light.

VOLTS

20

30

40

10

L

L__/

50

VOLTAGE

COARSE

FINE

METER

SELECTION

vOLTS^yjUgl^mA

+

GND

Figure

3-1.

Front

Panel

Controls

and

Indicators

b.

Set

METER

SELECTION

switch

(4)

to

VOLTS

position.

c.

Turn

COARSE

(6)

and

FINE

(5)

VOLTAGE

controls

fully

ccw

to

ensure

that

output

decreases

to

OV,

then

turn

the

VOLTAGE

controls

fully

cw

to

ensure

that

output

voltage

increases

to

the

maxi

mum

rated

output

voltage.

d.

Connect

a

milliammeter

across

the

out

put

of

the

supply

(3)

to

check

that

the

current

limit

circuit

within

the

supply

is

limiting

the

out

put

current

to:

Model

Current

Limit

6213A

1300

±50mA

6215A

475

±10mA

6217A

250

±10mA

e.

Remove

milliammeter

and

connect

load

to

output

terminals.

3-3

OPERATION

3-4

The

power

supply

can

be

operated

as

a

single

unit

(normal

operation),

in

parallel,

or

in

series.

The

output

of

the

supply

can

be

floated

up

to

300

volts

off

ground.

3-6

To

select

a

constant

voltage

output

turn

on

the

supply

and,

with

no

load

connected,

adjust

the

VOLTAGE

controls

for

the

desired

output

volt

age.

To

check

the

current

limit,

connect

an

ex

ternal

ammeter

across

the

output

of

the

supply,

turn

the

VOLTAGE

controls

fully

clockwise,

and

observe

the

reading.

The

current

limit

is

factory

adjusted

in

excess

of

the

current

rating

of

the

supply.

If

the

existing

current

is

not

compatible

with

the

anticipated

load

requirements,

the

limit

can

be

changed

as

outlined

in

the

following

para

graphs.

3-7

CHANGING

CURRENT

LIMIT

3-8

The

current

limit

can

be

varied

by

adjusting

resistor

R50,

located

on

the

printed

wiring

board.

This

adjustment

procedure

is

described

in

Para

graph

5-63.

The

range

of

the

current

limit

control

R50

is

as

follows:

Model

Current

Limit

Range

6213A

800

-

1700mA

6215A

300

-

540mA

6217A

180

-

300mA

The

current

limit

is

normally

adjusted

to

a

value

far

in

excess

of

the

current

rating

of

the

supply

to

prevent

the

deterioration

of

line

and

load

regulation.

Therefore,

if

for

any

reason

the

current

limit

is

adjusted

so

that

the

output

current

is

close

to

this

value,

the

performance

will

not

meet

the

published

specifications.

3-9

CONNECTING

LOAD

3-10

Each

load

should

be

connected

to

the

power

supply

output

terminals

using

separate

pairs

of

connecting

wires.

This

will

minimize

mutual

coup

ling

effects

between

loads

and

will

retain

full

ad

vantage

of

the

low

output

impedance

of

the

power

supply.

Each

pair

of

connecting

wires

should

be

as

short

as

possible

and

twisted

or

shielded

to

re

duce

noise

pickup.

(If

shield

is

used,

connect

one

end

to

power

supply

ground

terminal

and

leave

the

other

end

unconnected.)

3-11

If

load

considerations

require

that

the

output

power

distribution

terminals

be

remotely

located

from

the

power

supply,

then

the

power

supply

out

put

terminals

should

be

connected

to

the

remote

distribution

terminals

via

a

pair

of

twisted

or

shielded

wires

and

each

load

separately

connected

3-1