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OPERATING AND SERVICING MANUAL

MODEL 7121

POWER

SUPPLY

Serial

511

and Above

HEWLETT-PACKARD

COMPANY

275

Page

Mill

Road

•

Palo

Alto,

California,

U.S.A.

OPERATING

AND

SERVICING

MANUAL

FOR

MODEL 7128

POWER

SUPPLY

Serial

511

and

Above

1954

Hewlett-Packard

Company

The

information

contained

this

booklet

intended

for

the

operation

and

main-

tenance

Hewlett-Packard

equipment

and

not

used

otherwise

reproduced

without

the

written

consent

the

Hewlett-

Packard

Company.

HEWLEn·PACKARD COMPANY

275 PAGE MILL ROAD, PALO ALTO, CALIFORNIA, U.S.A.

7121004.1

TABLE

OF CONTENTS

FOR

MODEL 712B POWER

SUPPLY

Para.

Page

Para.

Page

SECTION

GENERAL

DESCRIPTION

MAINTENANCE

-1

General.

·1

-1

4-1

Cover

and

Bottom

Plate

-2

Inspection.

-1

Removal

4-1

4-2

Replacements

···. .

4-1

4-3

Adjustments

··

4-3

SECTION

4-4

Line

Regulation

Adjustment

4-3

2-1

Controls

and

Terminals.

2-1

4-5

Adjustment

Fixed

-300

2-2

Operation

······

2-2

Volt

Bias

Supply

Output

Voltage

· · ····· ·

4-5

4-6

Adjus

tment

Supply

SECTION

III

Output

Voltage

•····

4-5

4-7

Setting

Variable

Resistor

3-1

General

.· · .····

3-1

R39

.····· · · ·

4-5

3-2

High

Voltage

Regulator

4-8

Setting

the

Stop

the

H V

Circuit

.··.····...

3-1

Control

····· · · ·..

4-7

3-3

Bias

Supply

Circuit.

··

3-3

SECTION

TABLE

REPLACEABLE

PARTS

TABLE

SPECIFICATIONS

OUTPUT

VOLT

AGES

REGULATED

HIGH

VOLT

AGE:

REGULATED

FIXED

BIAS:

VARIABLE

BIAS:

UNREGULATED:

+500

volts

(without

switching),

200

maximum

load.

-300

volts,

maximum

load.

-150

volts,

maximum

load.

6.3

volts

CT,

amps

maximum

load.

OUTPUT

VOLTAGE

REGULATION

(for

constant

line

voltage)

REGULATED

HIGH

VOLT

AGE:

REGULATED

FIXED

BIAS:

VARIABLE

BIAS:

LINE

VOLTAGE

REGULATION

RIPPLE

INTERNAL

IMPEDANCE

REGULATED

HIGH

VOLTAGE:

RECOVERY

TIME

METERING

CURRENT

METER:

VOLTMETER:

TERMINALS

OVERLOAD

PROTECTION

POWER

SUPPLY

DIMENSIONS

WEIGHT

Less

than

millivolts

change

no-load

full-load

any

output

voltage.

Less

than

millivolts

change

no-load

full-load.

tied

fixed

bias,

hence

source

regulation

same

for

fixed

bias.

Internal

impedance

10,

000

ohms,

depending

bias

control

setting.

Regulated

output

voltages

vary

less

than

±l00

millivolts

for

line

voltage

variations

115

volts

±1O%.

Less

than

500

microvolts.

(For

frequencies

above

cps.)

Full-load:

0.1

ohm

series

with

microhenries

maximum.

No-load:

ohm

series

with

microhenries

maximum.

Upon

application

full-load:

0.1

millisecond

maximum.

Upon

decrease

from

full-load

to:

(a)

ma,

0.5

millisecond

maximum.

(b)

ma,

O. 1

millisecond

maximum.

Maximum

transient

voltage,

volt.

200

ma.

(high

voltage

only.)

Three

ranges,

+500

volts,

+150

volts

and

-150

volts.

Panel

switch

connects

meter

regulated

high

voltage

variable

bias

and

selects

range.

Either

positive

negative

regulated

high

voltage

terminal

may

grounded.

Positive

terminals

both

bias

supplies

and

nega-

tive

terminals

regulated

high

voltage

are

common.

line,

regulated

high

voltage,

regulated

fixed

bias

and

filament

supply

are

separately

fused.

regulated

high

voltage

drops

safe

value

bias

fuse

blows.

115

volts

±10%,

cps.

Approximately

120

450

watts

depending

load

and

line

voltage.

Cabinet

Mount:

12-1/2"

high,

20-1/2"

wide,

l4-l/4"_deep.

Rack

Mount:

Panel

10-1/2"

high,

19"

wide,

14-1/4"

deep.

Cabinet

Mount:

6!1lbs.

shipping

weight

approx.

104

lbs.

Rack

Mount:

lbs.

shipping

weight

approx.

lbs.

SECTION I

GENERAL DESCRIPTION

CAUTION

Voltages

which

are

dangerous

life

are

present

the

terminals

and

within

this

instrument.

1-1

GENERAL

The

Model

7l2B

Power

Supply

very

stable

source

continuously

variable

direct

cur-

rent

for

plate

and

bias

circuits.

also

pro-

vide

amper

es,

6.3

volts

alternat-

ing

curr

ent

for

filament

cir

cuits

• A

two-

range

voltmeter

and

milliammeter

(high

voltage

only)

are

provided

measure

the

direct

current

output.

This

power

supply

veryusefulas

apower

sourcefor

small

trans-

mitters,

oscillators,

complex

systems,

cer-

tain

types

klystrons,

and

general

labora-

tory

use.

CAUTION

The

power

should

turned

for

least

seconds

before

switch-

ing

the

high

voltage.

This

allows

the

regulator

circuits

reach

their

proper

operating

point

and

avoids

exces

sive

voltage

the

high

voltage

terminals.

1-2 INSPECTION

This

instrument

was

thoroughly

tested

and

inspected

before

being

shipped

and

ready

for

use

when

received.

After

the

instrument

unpacked,

should

inspected

for

damage

received

transit.

any

shipping

damage

found,

the

procedure

outlined

the

"Claim

for

Damage

Shipment"

page

the

backof

this

instruc-

tion

manual.

-1

SECTION II

OPERATING INSTRUCTIONS

2-1

CONTROLS AND TERMINALS

POWER

This

toggle

switch

controls

the

power

sup-

plied

the

instrument

from

the

power

line.

When

the

switch

the

position

the

red

indicator

lamp

above

the

switch

will

glow.

LINE

AMP

The

fus

eholder,

located

the

control

panel,

contains

a 4

ampere

cartridge

fuse

for

the

protection

the

whole

instrument.

The

fuse

may

replaced

turning

the

fuse-

holder

cap,

removing

the

old

fuse,

and

in-

serting

new

fuse.

Replacement

fuses

for

this

instrument

must

the

"Slo-Blo"

type

specified

the

Replaceable

Parts

List.

-300V

1/16

AMP

The

fus

eholder,

located

the

control

panel,

contains

1/16

ampere

cartridge

fuse

for

the

protection

the

-300

volt

fixed

bias

supply.

The

fus

may

replaced

turn-

ing

the

fuseholder

cap,

removing

the

old

fuse,

and

inserting

new

fuse.

NOTE

this

fuse

blows,

the

positive

high

voltage

regulator

circuit

will

drop

the

voltage

level

less

than

100

volts,

thus

protect-

ing

external

equipment

cir-

cuits

against

the

pos

ibility

damage

due

loss

bias

•.

When

the

openfuse

replaced,

all

cir-

cuits

restore

normal.

+HV

1/2

AMP

The

fus

eholder,

located

the

control

panel,

contains

amper

cartridge

fus

for

the

protection

the

high

voltage

cir

cuit.

The

fuse

may

replaced

turning

the

fuseholder

cap,

removing

the

old

fuse,

and

inserting

new

fuse.

2-1

CAUTION

this

fuse

blows,

immediately

turn

off

the

POW

switch,

and

then

replace

the

fus

Con-

tinued

operation

the

instrument

with

the

+HV

1/2

AMP

fuse

open

will

damage

the

screen

grids

the

series

regulator

tubes

(V3,

V4,

V5,

V6).

HIGH

VOLTAGE

This

toggle

switch

turns

the

high

voltage

direct

current

off

and

on.

The

switch

also

controls

the

red

indicator

light

above

the

control

panel.

When

the

switch

on,

the

indicator

lamp

glows

warning

that

the

high

voltage

turned

on.

6.3V

AC,

AMP

The

two

fuseholders,

located

the

control

panel,

each

contain

a15

ampere

cartridge

fus

for

protection

the

6.3

volt

fila-

ment

supply

circuit.

Each

fuse

may

re-

placed

turning

its

fus

eholder

cap,

re-

moving

the

old

fuse,

and

inserting

new

fuse.

Replacement

fuses

must

the

"Slo-Blo"

type

specified

the

Replace-

able

Parts

List.

6.3V

AMP

These

binding

posts

are

terminals

for

the

unregulated

filament

supply.

6.3V

AMP

These

are

the

terminals

for

the

6.3

volt

unr

egulated

alternating

current.

This

binding

post

the

terminal

for

the

center

tap

the

secondary

winding

from

which

the

unregulated

taken.

-300V

5!vIA

GND

These

binding

posts

are

terminals

for

the

bias

supply

output

and

chassis

ground.

-300V

Output

terminal

for

the

fixed

-300V

regu-

lated

voltage

supply.

Output

terminal

for

the

variable

(0-150

volt)

regulated

bias

voltage

supply.

GND

Terminal

for

making

connection

the

chassis.

Anyone

the

output

terminals

may

connected

the

chassis

con-

nection

terminal

GND.

COM

+HV

GND

These

binding

posts

are

terminals

for

the

high

voltage

supply,

common

conductor,

and

chassis

ground.

+HV

Output

terminal

for

the

regulated

0-500

volt

voltage

supply.

COM

Output

terminal

common

the

HV,

(variable

bias),

and

-300V

(fixed

bias)

cir

cuits

•

GND

Terminal

for

making

connection

the

chassis.

-BIAS

CONTROL

This

control

varies

the

output

the

regu-

lated

bias

voltage

supply

from

150

volts.

CONTROL

This

control

varies

the

output

the

regu-

lated

high

voltage

supply

from

500

volts.

METER

RANGE

This

switch

connects

the

regulated

high

voltage

supply

circuit

the

voltmeter

either

the

0-150V

0-500V

range.

Opera-

tion

the

switch

0-150

-BIAS

connects

the

variable

bias

supply

circuit

the

volt-

meter.

2-2 OPERATION

CAUTION

Avoid

electric

shock

turning

the

high

voltage

switch

the

off

posi-

tion

before

making

any

connections

the

instrument.

2-2

The

procedure

for

operating

the

Model

712B

Power

Supply

follows:

Connect

the

power

cable

aIlS

power

line

and

turn

the

POWER

switch

ON.

NOTE

The

triple

-conductor

power

cable

supplied

with

the

new

NEMA

approv-

three-prong

plug.

The

third

con-

ductor

provides

chassis

ground.

adapter

may

obtained

per-

mit

use

this

plug

with

two-conduc-

tor

receptacles.

With

the

HIGH

VOLTAGE

switch

the

off

position,

connect

the

output

terminals

the

load.

the

bias

supply

ed,

set

the

METER

RANGE

switch

the

0-150V

-BIAS

position

and

adjust

the

-BIAS

CONTROL

for

the

desired

voltage.

NOTE

The

internal

impedance

the

vari-

able

bias

circuit

can

high

10,

000

ohms,

depending

the

set-

ting

-BIAS

CONTROL.

Set

the

METER

RANGE

switch

the

150V

500V

position,

and

adjust

the

ONTR

for

the

des

ired

output

voltage.

Turn

the

HIGH

VOLTAGE

switch

ON,

check

the

bias

voltage,

and

readjust

-BIAS

CONTROL

necessary.

the

Model

712B

used

for

application

which

requires

power

sup-

ply

than

500

volts,

300

volts

additional

may

made

available

connect-

ing

the

load

across

+HV

and

-300V

MA.

Ground

may

connected

either

terminal,

desired.

SECTION III

CIRCUIT DESCRIPTION

3-1

GENERAL

The

Model

7l2B

Power

Supply

furnishes

two

separate

regulated

supplies:

positive

high

voltage

the

0-500

volt

range

and

bias

voltage.

block

diagram

the

Model

7l2B

shown

Figure

1 •

Voltage

level

the

high

voltage

supply

ad-

justed

means

panel

knob,

CON-

TROL,

which

controls

the

setting

variable

autotransformer

Tl.

The

autotransformer

supplies

primary

voltage

the

high

voltage

power

transformer,

T2.

The

comparis.on

voltage

the

regulator

circuit

adjusted

means

variable

resistor

R39

which

me-

chanically

coupled

the

autotransformer

shaft.

This

arrangement

maintains

the

regu-

lator

circuit

its

optimum

operating

point,

regardless

output

voltage

level.

After

the

high

voltage

has

been

rectified

(dual

diodes

and

V2)

and

filtered,

applied

group

series

regulator

tubes

(pentodes

V3-V6),

the

milliammeter,

and

then

the

high

voltage

output

terminal,

+HV.

The

conduction

the

series

regulator

tubes

controlled

cascade

differential

amplifier

(dual

triodes

V12

and

V13).

The

differential

amplifier

compares

sample

the

output

voltage

with

the

voltage

developed

across

voltage

reference

tube

VII;

any

difference

between

thes

voltages

amplified

and

the

conductivity

the

series

regulator

tubes

changed

accordingly.

The

fixed

bias

voltage

(-300V)

supply

con-

sists

conventional

power

transformer,

full-wave

rectifier

(dual

diode

V7),

and

capa-

citor

-input

filter.

The

voltage

regulated

means

series

regulator

tube

(pentode

VB),

which

controlled

turn

cascade

differential

amplifier

(dual

triodes

and

VlO).

Operation

the

regulator

circuit

similar

the

+HV

regulator

described

above.

source

variable

bias

voltage

provided

means

voltage

divider

(variable

re-

sistor

R46)

which

connected

between

the

-300V

terminal

and

the

COM

terminal.

This

voltage

regulated

against

line

voltage

variations

only.

Since

the

internal

impedance

may

high

10,

000

ohms,

depending

upon

the

setting

resistor

R46,

the

voltage

will

depend

upon

the

actual

load

current

be-

ing

drawn

rna.

max.).

This

voltage

can

measured

turning

the

METER

RANGE

switch

the

-150

-BIAS

position.

3-2

HIGH

VOLTAGE REGULATOR CIRCUIT

The

regulator

circuit

arranged

that

slight

voltage

change

the

sampled

output

the

positive

directionwill

result

rela-

tively

large

voltage

swing

the

negative

di-

rection

the

grids

the

series

regulator

tubes,

and

vice

versa.

Figure

shows

the

arrangement

dual

tri-

odes

V13

and

V12

which,

connected

cascade,

form

two

stage

differential

amplifier.

each

tube,

cathode

connections

are

common

for

the

two

sections.

Thus

any

variation

plate

current

one

section

appears

across

the

cathode

resistor

common

both

sections,

and

results

difference

voltage

each

the

output

circuits.

the

first

stage,

fixed

bias

supplied

voltage

reference

tube

VII

applied

one

grid

dual

triode

V13.

The

bias

the

other

grid

V13

portion

the

+HV

voltage,

sampledwithrespectto

the

-300voltbias

sup-.

ply

through

voltage

divider.

Any

variation

the

level

the

output

voltage

results

voltage

changes

the

plate

circuits

both

sections

V13,

and

corresponding

changes

the

bias

the

grids

dual

triode

VIZ

the

stage.

For

example,

the

voltage

the

sampled

output

swings

the

positive

direction,

in-

creased

current

will

flow

through

the

right-

hand

section

V13,

which

will

raise

the

cath-

ode

voltage

and

lower

the

right-hand

plate

(pin

voltage.

Since

the

bias

the

grid

the

left-hand

section

V13

remains

fixed,

the

increas

cathode

voltage

will

decrease

conduction

the

left-hand

half

the

tube,

which

result

increase

voltage

the

left-hand

plate

(pin

6).

3-1

OUTPUT

I--~_-o_

+HV

CURRENT

HIGH

VOLTAGE

SUPPLY

CONTROL

~------------------------~

SERIES

REGULATOR

""'--+

.........

r---..&.-

VARIABLE

..-

I--

TRANSFORMER

DIFFERENTIAL

r--o+-

AMPLIFIER

POWER

INPUT

115V

5O-IOOO/V

VOLTAGE

REFERENCE

TUBE

DIFFERENTIAL

AMPLIFIER

OUTPUT

VOLTAGE

-300

VOLT

SUPPLY

SERIES

REGULATOR

......

-------+--00_

COM

">4o-------4II~O_

o -BIAS CONTROL

lGND

-300V

50MA

6.3V

IOAMP

'FILAMENT

TRANSFORMER

......

--------------------0

Figure

Model

7l2B

Block

Diagram

3-2

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