HP 711A User manual

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71lA

POWER

PPLY

SERIALS

PREfiXED:

002-

OPERATING

AND

SERVICING

MANUAL

)

OPERATING

AND

SERVICING

MANUAL

MODEL

711A

POWER

SUPPLY

SERIALS

PREFIXED:

002-

HEWLETT-PACKARD

COMPANY 1956

275 PAGE

MILL

ROAD,

PALO

ALTO,

CALIFORNIA,

S. A.

711A004

-3/1-60

)

OUTPUT

VOLTAGES

Regulated

High Voltage:

Unregulated:

REGULATION

RIPPLE

METERING

Current

Meter:

Voltage

Meter:

TERMINALS

OVERLOAD

PROTECTION

POWER

SIZE

Cabinet

Mount

Rack

Mount

WEIGHT

Cabinet

Mount:

Rack

Mount:

SPECIFICATIONS

500

volts

(without

switching),

100 rna

maximum

load.

6.3

volts,

amps

maximum

load;

12.6

volts

CT,

amps

maxi-

mum

load

For

line

voltage

115/230

volts

±10%,

less

than

0.5%

change

volt

chang~,

whichever

greater;

from

load

full

load,

change

less

than

0.5%

1. 0

volt

(whichever

greater).

Less

than

0mv

100 rna; 0

10 with

push-button

+500

volts;

+50

volts

with

push-button

Either

positive

negative

regulated

high

voltage

terminal

may

grounded

line

fused.

Overload

relay

prevents

output

from

greatly

exceeding

current

rating

output

milliammeter

thus

protecting

instrument

from

overload

conditions

including

short

circuit

output.

115/230

volts

±10%,

50/1000

cps.

Approximately

145

watts

de-

pending on

load

and

line

voltage.

7-3/8

in.

wide,

11-1/2

in. high,

14-1/4

in.

deep.

19 in. wide, 7in. high,

12-7/8

in.

deep

behind

panel.

Net: 20

lbs.,

shipping:

lbs.

Net: 24

lbs.,

shipping:

lbs.

SECTION I

CONTENTS

GENERAL DESCRIPTION

1 - 1

1 - 2

1 - 3

1 - 4

General

Description

Inspection

....

Power

Cable.

. .

230-Volt

Operation

1-1

I - 1

I - 2

SECTION II

OPERA

TING INSTRUCTIONS

2 - 1

2 - 2

2 - 3

Controls

and

Terminals

Operating

Procedure

Output

Options

. . . . .

II -1

11-2

II - 3

SECTION

ill

CIRCUIT DESCRIPTION

3 - 1

3 - 2

3 - 3

3 - 4

3 - 5

General

Description.

. . . . .

Input .

Regulation.

.........

Setting

Output

Voltage

Level.

Overload

Relay.

. . . . . . .

ill

-1

ill

-2

ill

-2

ill

-3

ill

-5

SECTION

IV MAINTENANCE

4 - 1

4 - 2

4 - 3

4 - 4

4 - 5

4 - 6

4 - 7

4 - 8

4 - 9

4 - 10

General

.....

Cover

Removal

Tube

Replacement

Electrolytic

Capacitors

Replacement

Variable

Resistors.

. .

Replacement

Rectifiers.

......

Meter

Zero

Adjustment

. . . . . . . .

Power

Transformer

Primary

Connections.

Trouble

Shooting

Chart

Trouble

Localization

. . . . . . . . . .

-1

IV -1

-1

-2

IV -2

- 3

IV -3

IV - 3

IV -4

IV - 6

SECTION

TABLE

REPLACEABLE

PARTS

5 - 1

Table

Replaceable

Parts

. . . . . . . . . . . . . . . . . . V - 1

Sect.

Page

SECTION

GENERAL

DESCRIPTION

,------------------

CAUTION

-------------------,

Dangerous

voltages

are

present

the

terminals

and within

this

instrument

)

1·1

GENERAL DESCRIPTION

The Model 71lA

Power

Supply

general-purpose

low-power

d-c

and

a-c

voltage supply

particularly

suited

powering

experimental

setups.

means

the

facilities

provided

the

Model

711A

the

following

voltages

are

made

available

the

output

terminals

the

control

panel:

Unregulated

ac:

6.3

volts,

amperes

maximum

load

current

(two

supplies)

6.3

volts,

amperes

maximum

load

current

(one supply)

12.6

volts,

amperes

maximum

load

current

(one

supply,

tapped

6. 3V).

Regulated

dc:

oto 500

volts,

continuously

variable;

maxi-

mum

output

load

current,

100

mao

NOTE:

Insulation

within

the

Model 711A

permits

operating the

d-c

output voltage

much

500

volts

from

chassis

ground

that

two Model 71lA

power

supplies

may

operated

series

obtain

1000

volts

d-c

output while

each

instrument

chassis

re-

mains

ground

potential.

The

d-c

output of the Model 71lA

has

high stability;

for

line

voltage

variations

within

rated

limits,

the

level of the regulated output will

vary

less

than

volt

(whichever

greater),

and

from

load

to full load the

level

the

output will

vary

less

than

0.5%

volt

(whichever

greater).

Ripple will

less

than

0.001

volt.

While the

internal

impedance of

the

Model

711A

will

vary

both with the

d-c

load

current

and the frequency

of any reflections from the equipment being powered,

the

internal

impedance

the

Model

711A

will

less

than

ohms

with any load

current

and

any

frequency

to afew

megacycles.

The

output

continuously

monitored

by two

meters,

voltmeter

and

milliammeter.

Alow

and high

range

are

provided

for

each

meter

that

low

values

of voltage and

current

may be

read

accu-

rately.

The

power

supply

protected

from

input

out-

put

overload

(1)

afuse

the

line-voltage

input

circuit

and

(2)

relay,

the

main

positive

bus,

which

operates

overload

current

interrupt

con-

duction through the

regulator.

1·2 INSPECTION

This

instrument

was

thoroughly

tested

and inspected

before

being shipped, and

ready

for

use

when

re-

ceived.

After

the

instrument

unpacked,

should be

in-

spected

carefully

for

damage

received

transit.

If any shipping damage

foUId, follow the

procedure

outlined

the"

Claim

for

Damage

Shipment"

sheet

this

instruction

manual.

Sect. I

Page

1.3 POWER

CABLE

The

three-conductor

power cable supplied with

this

instrument

terminated

in a

polarized

three-prong

male connector recommended

the National

Elec-

trical

Manufacturers' Association. The

third

contact

an offset round pin added to a

standard

two-blade

connector which grounds the instrument

chassis

when

used

with

appropriate

receptacle.

use

this

connector

with a

standard

two

contact

receptacle,

adapter

should

used to connect the

NEMA

con-

nector to the two-contact

system.

When

the

adapter

used,

the

third

contact

terminated

in a

short

lead

from

the

adapter

which

can

then

be connected

the

outlet

mounting

box in

order

ground

the

instrument

chassis.

1·4 230·YOLT OPERATION

This

instrument

normally

shipped

from

the

factory

with

the

dual

115

volt

primary

windings

the

transformer

connected in

parallel

for

oper-

ation

from

nominal

115

volt

source.

oper-

ation

from

nominal

230

volt

source

desired,

the

windings

may

easily

reconnected

series.

Refer

the

schematic

drawing

for

details.

The

power

fuse

must

changed

from

a1. 6

am-

pere

slow-blow

fuse

0.8

ampere

slow-blow

fuse.

)

2.1

CONTROLS AND TERMINALS

All

controls

and

terminals

except

the

fuseholder

are

mounted on

the

front

panel.

The

fuseholder

mounted on

the

rear

plate

the

instrument.

Voltmeter

This

sin~le-scale,

two-range

500

volts;

0to

volts)

voltmeter

indicates the voltage

level

the

output of the main regulator. With the

VOLTAGE

switch

ON,

the

level

of voltage

the

VOLT-

AGE

output

terminals

indicated by

the

voltmeter.

Normally

the

meter

indicates

on the

500-volt

range; with the

VOLTS FULL SCALE push-button

switch

depressed,

the

meter

indicates

the

50-volt

range.

Milliammeter

This single-scale, two-range

100

milliamperes;

rna)

milliammeter

indicates

the

value of

the

d-c

l.)ad

current.

100 rna

can

flow

the

load

circuit

without

overloading

the

milliammeter.

Normally

the

meter

indicates

the

100-ma

range;

with

the

FULL

SCALE

push-button

depressed,

the

meter

indicates

the

10-ma

range.

VOLTS

FULL

SCALE -

When

operated

(depressed),

this

SPDT

push-button

switch

opens

the

high-range

series

multiplier

re-

sistor

and

inserts

the

low-range

multiplier.

FULL

SCALE -

This

push-button

switch,

which

ccnnected

for

DPST operation,

controls

the

proportion

current

diverted

the

respective

shunts

across

(1)

the

milliammeter

and

(2)

the

protective

relay

series

with

the

milliammeter.

When

the

FULL

SCALE

switch

operated,

the

protective

relay

operates

between

and 17 rna

interrupt

con-

duction

through

the

regulator

and

thereby

inter-

rupt

the

flow of

current

through

the

milliammeter.

Sect. II

Page

SECTION

OPERATING

INSTRUCTIONS

With the switch

normal, the protective

relay

oper-

ates

between 110 and 170 rna.

D-C

VOLTS

ADJ.

Acijustment of

the

regulated

d-c

voltage to the

desired

level

means

the

FINE and COARSE

control

mounted unQ'er

the

VOLTS ADJ. designation.

The

level

voltage

obtained

any

given

setting

the

controls

indicated

the

voltmeter,

and

the

resulting

flow of

current

the

load

circuit

indicated

the

milliammeter.

COARSE -

Operation

the

COARSE

control

(1)

adjusts

the

setting

of a

I-megohm

variable

resistor,

R11, and

(2)

operates

two

microswitches,

SIA

and

SIB.

Variable

resistor

R11

part

the

voltage

divider

the

circuit

which

controls

the

level

the

regulated

d-c

output

voltage.

The

microswitches

make connection to

various

taps

the

power

transformer

secondary

wind-

ing which

furnishes

voltage

for

the main

d-c

supply

circuit.

the

low-voltage

position

(ccw) of the

COARSE

control, the

main

d-c

supply

circuit

fed

the

low-voltage

section

the

winding.

the

control

turned cw, the microswitches

are

actuated

complete

connection

the

higher

voltage

taps.

FINE -

Operation

of the FINE

control

varies

the

setting

variable

resistor

R12.

This

resistor

also

part

the

voltage

divider

the

circuit

which

controls

the

level

the

regulated

d-c

output

voltage.

Indicator

Lights

There

are

two

indicator

lights

the

ccntrol

panel:

AC'VOLTAGE

This

red

indicator

light

glows

indicate

that

power

applied

the

instrument

circuits.

Sect.

Page

DC VOLTAGE -

The

operating

circuit

this

in-

dicator

light

controlled

the

DC VOLTAGE

switch,

and

the

light

glows

red

when

the

switch

indicate

that

voltage

applied

the

VOLTAGE

output

terminals.

VOLTAGE

Switch

This

SPST

toggle

switch

the

primary

circuit

the

power

transformer.

With

the

VOLTAGE

switch

ON,

line

voltage

closed

power

trans-

former

T1.

VOLTAGE

Switch

There

no voltage on the DC VOLTAGE output

ter-

minals

until

the

DC VOLTAGE

switch

the

position.

When

operated,

this

DPST

toggle

switch:

'(1)

connects the positive

d-c

bus

the

DC VOLTAGE

output

terminals

and

(2)

closes

the

circuit

the

VOLTAGE

indicator

light.

Output

Terminals

Both

the

VOLTAGE

and

DC VOLTAGE

output

terminals

are

the

binding-post

type,

will

accom-

modate

either

banana

plug

wire,

and

are

arranged

that

any banana plug with

3/4-inch

spacing

may

used.

VOLTAGE

There

are

two

pairs

of output

terminals

associated

with

the

a-c

voltage

supply.

Depending

how

the

terminal

connections

are

made

(see

paragraph

2-3

below),

the

Model

71lA

may

arranged

supply

the

following

a-c

voltages:

6.3

volts

amperes

(two

circuits),

6.3

volts

amperes

(one

circuit),

12.6

volts

amperes

(one

circuit,

tapped

6.3

V).

VOLTAGE

There

one

pair

of output

terminals

for

the

regu-

lated

d-c

voltage supply: +and

The

binding-post

nuts

for

the

and

terminals

are

insulated.

Neither

the

nor

the

terminal

connected

the

chassis

within

the

instrument

that

the

d-c

supply

may

operated

either

above

below ground

appropriate

external

connedion

ground.

the

same

mounting

plate

with

the

and

termi-

nals

terminal

(G)

which

ccnnected

the

in-

strument

chassis.

The

terminal

cmnected

earth

ground

when

the

power-cable

connector

plugged

into

grounded

female

connector.

FUSE

The

fuseholder,

which

mounted on

the

rear

plate

the

instrument,

contains

the

time-delay

cartridge

fuse

which

protects

the

input

circuit.

Before

start-

ing to

install

anew fuse,

check

that

the

power

cable

disconnected

from

the

line.

Replacement

fuses

must

the

slow-blow

type:

6-ampere

fuse

for

115-volt

operation

8-ampere

fuse

for

230-volt

operation.

2-2 OPERATING

PROCEDURE

sure

the

Model

711A

placed

that

nothing

can

obstruct

the

ventilating

louvers

the

sides

the

cabinet.

Safe

operating

temperatures

with

the

cabinet depend upon

free

air

flow through the

louvers.

Before

operating

the

instrument

for

the

first

time,

see

paragraph

4-7,

Meter

Zero

Adjustment.

b. Check that both the

VOLTAGE and

VOLT-

AGE

switches

are

the

off

position.

After

the

Model

71lA

has

been

plugged into a

power

source

specified

voltage and frequency,

turn

the

VOLT-

AGE

switch

ON,

and

allow a

two-minute

warmup

period.

NOTE:

the

Model 711A

operated

from

23Q:Volt

source,

check

(1)

that

power

transformer

strapped

for

230-volt

operation

(strapping

options

are

shown

the

schematic

diagram),

and

(2)

that

fuse

8-ampere

Slo-Blo

fuse.

See

paragraph

4-8.

With the DC VOLTAGE switch

still

the

off position,

connect

the

load.

For

connection

arrangements

for

the

various

options,

see

paragraph

2-3,

below.

Check

that

the

COARSE

control

its

maxi-

mum

counterclockwise

(low-voltage)

position.

Turn

the

DC VOLTAGE

switch

ON.

obtain

the

desired

level

d-c

voltage,

ad-

just

the

COARSE and FINE

controls.

The

volt-

meter

indicates

the

level

the

d-c

voltage

being

supplied to

the

+and -output

terminals.

the

level

the

d-c

supply

below

volts,

the

voltmeter

may

operated

the

50-volt

range

depressing

the

VOLTS

FULL

SCALE

push-button

during

the

voltage

adjustment

procedure.

)2·3

OUTPUT

OPTIONS

A-C

Options -

(Figure

2-1)

The

a-c

supply may

arranged

for

anyone

three

options:

Two

6.3-volt,

3-ampere

supplies

(Figure

2-1A)

One 6.

3-volt,

6-ampere

supply, by connecting the

two 6.

3-volt

supplies

parallel

(Figure

2-1B)

One

12.6-volt,

3-ampere

supply, by connecting

the

two 6.

3-volt

supplies

series

(Figure

2-1C)

Sect.

Page

D-C Options -

Among

the operating options

for

which

the

d-c

voltage

supplyterminationsmay

arranged

are

the following:

oto

500

volts,

positive

negative

with

respect

chassis

ground.

oto

500

volts,

neither

side

grounded. (It

recom-

mended

that

the

instrument

chassis

grounded

whenever both

d-c

terminals

are

operated

apoten-

tial

above

below

ground.)

1000

volts,

connecting

two Model 711A

series.

LOAD

6.3V

6.3 V

EJOI

tAl

LOAD

6.3V 6.3 V

3A 3A

(8)

LOAD

STR_AP-+-+--,

,~,

(C)

)

Figure

2-1.

Model 71lA Connection

Arrangements

for

A-C

Supply Options

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