Tektronix 567 User manual

Table of contents

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INSTRUCTION

MAN

UAL

Tektronix,

Inc.

Serial

Number

TYPE

567

READOUT

OSCILLOSCOPE

S.W.

Millikan

Way

@

P.

O.

Box

500

@

Beaverton,

Oregon

97005

®

Phone

644-0161

@

Cables:

Tektronix

070-0322-01

965

ype

and

Serial

nu

for

baeeen

i

SECTION

1

CHARACTERISTICS

General

Information

The

Tektronix

Type

567

Readout

Oscilloscope

is

the

power

supply

and

indicator

unit

for

a

complete

system

that

provides

digital

readout

of

signal

information.

The

two

smaller

plug-in

cells

accept

any

of

the

Tektronix

2

or

3

Series

plug-in

units.

The

large

plug-in

cell

accepts

the

Tektronix

6

Series

digital

units.

The

digital

units

are

com-

patible

with

some

(but

not

all)

of

the

2

or

3

Series

units.

See

your

Tektronix

Field

Engineer

for

details.

Without

the

digital

unit,

the

Type

567

will

operate

in

the

normal

oscillo-

scope

manner.

With

the

digital

unit,

the

system

can

readout

its

own

display

of

risetime,

amplitude

or

time

difference

for

either

conventional

voltage-time

displays

or

sampling

equiva-

lent-time

displays.

The

system

provides

“go,

no-go"

signals,

and

can

be

programmed

automatically

using

up

to

three

Tektronix

Type

262

Programmers.

ELECTRICAL

CHARACTERISTICS

Power

Supplies

Electronically

regulated

for

stable

operation

with

widely

varying

line

voltages

and

loads.

Line

voltage

requirements—105

to

125

volts,

or

210

to

250

volts,

rms,

50

to

60

cps,

single-phase

ac.

Power—Approximately

400

watts

when

using

the

Type

3876,

3177

and

6R1A

Plug-in

Units.

Fuse—4

Amp

Fast-Blow

for

117

volts,

2

Amp

Fast-Blow

for

234

volts.

Cathode-Ray

Tube

Type—T5032-2-1

(S/N

1999-up}

5610-31

(S/N

750-1998}

T5031-2

{S/N

101-749)

Phosphors—Standard

phosphors

as

listed

above,

others

available

as

listed

with

accessories

at

end

of

this

section.

Unblanking—Deflection

type,

de

coupled.

Accelerating

potential—Approximately

3.5

kv.

Usable

viewing

area—8

divisions

vertical

by

10

divisions

horizontal.

Deflection

plate

deflection

factors

(nominal

at

3.5

kv)

(S/N

1999-up

(S/N

101-1998}

19.5

volts/div

22.8

volts/div

Horizontal—18.4

volts/div

18.4

volts/div

Vertical—

Graticule

Internal

within

ert

(S/N

1999-up)

External

plastic

(S/N

101-1998}

®1

I{lumination—Variable

edge

lighting.

Markings—Marked

in 8

vertical

and

10

horizontal

1-centi-

meter

divisions

with

2-millimeter

markings

on

the

centerlines.

Amplitude

Calibrator

(S/N

2060-up).

A

square

wave

with

accurate

time

duration

and

amplitude;

intended

for

use

when

setting

the

vertical

and

horizontal

plug-in

units

front-panel

calibrate

controls.

Two

output

frequencies,

an

accurate

20

kc

and

an

approximate

1

kc.

The

1-kc

square

wave

is

valuable

when

adjusting

low-frequency

attenuator

probes.

Output

Voltage—Separate

BNC

connectors

produce

ground-referenced

0.5

and

5

volts

peak

to

peak

when

loaded

(one

or

both

at

the

same

time)

by

100k

or

greater.

Same

connectors

provide

50

and

500

mv

peak

to

peak

when

loaded

{one

at

a

time)

by 50

ohms.

Accuracy—Voltage

accurate

to

--2%

peak

to

peak

into

100k

or

greater

loads.

Voltage

accuracy

into

502

depends

on

load

resistor:

-—-2%

peak

to

peak

when

50

is

within

1%

at

one

output

connector

at

a

time.

Frequency

of

20-kc

square

wave

is

within

0.1%

when

the

l-ke

square

wave

is

within

+80%

and

—40%;

symmetry

not

specified

for

either

frequency.

+Pre

Trigger—A

short-duration,

ground-referenced,

posi-

tive

pulse

at

least

600

mv

peak

to

peak

into

100k

or

greater,

that

occurs

approximately

1%,

cycle

ahead

of

each

plus

rise

of

square-wave

signal.

Amplitude

is

reduced

by

502

load,

but

+Pre

Trigger

signal

is

intended

for

externally

triggering

the

time-base

units

of

sampling

systems

not

employing

an

internal

trigger

pickoff.

All

three

output

connectors

of

the

Amplitude

Calibrator

are

short-circuit

proof.

External

short

circuits

will

not

damage

the

calibrator

circuits.

(S/N

101-299).

Waveform—Square

waves

at

line

fre-

quency.

Output

Voltage—0.05,

0.5,

5

and

50

volts,

peak

to

peak

into

1

meg

or

greater

load,

one

at

a

time.

Accuracy—Peak-to-peak

amplitude

of

square

waves

within

3%

of

indicated

voltage.

(S/N

300-2059).

Above

characteristics

plus

100-mv

peak-to-peak

square

wave

available

from

0.5

jack

when

loaded

with

1%

509.

Ventilation

Forced,

filtered

air.

A

thermal

relay

interrupts

instrument

power

in

the

event

of

overheating.

Fan

remains

on

if

thermal

relay

opens

during

117-volt

operation.

Fan

turns

off.

if

thermal

relay

opens

during

234-volt

operation.

Temperature

of

the

thermal

relay

must

drop

about

15°

F

before

power

will

be

restored.

1-1

Characteristics—Type

567

MECHANICAL

CHARACTERISTICS

The

Type

567

is

constructed

with

aluminum-alloy

chassis

and

cabinet.

Cabinet

is

finished

with

a

durable

blue

vinyl

plastic.

The

unit

sits

on

short

anti-slide

neoprene

feet.

Cabinet

dimensions—Height

135/,”,

width

17”,

depth

23”.

Accessories

Information

on

accessories

for

use

with

this

instrument

is

included

at

the

rear

of

the

mechanical

parts

list.

®i

SECTION

2

OPERATING

INSTRUCTIONS

General

Information

The

Type

567

is

a

specially

designed

oscilloscope

for

producing

digital

display

of

information which

can

be

obtained

only

from

the

crt

on an

ordinary

oscilloscope.

The

digital

readout

system

can

be

made

to

display

either

voltage

or

time,

and

may

be

used

for

such

applications

as

measuring

the

peak-to-peck

amplitude

of

a

waveform,

or

its

risetime.

IF

dual-trace

plug-in

units

are

used

with

the

Type

567,

the

digital

readout

system

can

be

used

to

obtain

both

voltage

and

time

measurements

on

either

trace,

In

addition,

the

digital

readout

system

will

make

time

measurements

between

signals

displayed

on

one

trace

and

signals

displayed

on

the

other.

The

Type

567

and associated

units

are

relatively

easy

to

operate

once

the

basic

operating

procedures

are

understood.

It

is

the

purpose

of

this

section

ond

similar

sections

in

the

plug-in

unit

manuals

to

establish

the

proper

operating

tech

niques. This

manual

covers

instructions

for

the

Type

567

‘only.

For

operating

instructions

for

the

plug-in

units,

refer

to

the

applicable

instruction

manuals.

Preliminary

Instru

Before

operating

the

Type

567,

a

suitable

location

for

the

instrument

must

be

chosen. The

location

should

provide

a

stable

support

for

the

instrument.

Care

should

be

taken

that

adequate

air

circulation

is

permitted

through

the

instrument

by

keeping

it

away

from

walls,

or

from

other

equipment

which might

block

the

air

intake

through

the

filter

or

the

exhaust

passages

in

the

cabinet.

If

the

flow

of

air

over

the

components

in

the

unit

is

interrupted,

overheating

of

the

instrument

may

cause

a

thermal

relay

in

the

instrument

to

open,

shutting

down

the

instrument.

ns

The

Type

567

Oscilloscope

can

be

operated

from

110,

117,

or

124

volts,

or

220,

234,

or

248

volts.

The

only

changes

necessary

to

convert

from

one

operating

voltage

to

another

are

in

the

wiring

of

the

power

transformer

primary

and

the

fan

motor.

The

power

transformer

used

in

the

Type

567

Uses

two

separate

primary

windings

plus

two

6%

boost-buck

windings.

The

primary

windings

are

connected

in

parallel

for

117-volt

operation

and

in

series

for

234-volt

operation:

Proper

connections

for

each

line

voltage

are

shown

on

the

side

of

the

power

transformer

and

on the

Power

Supply

schematic.

A

small

metal

tag

near

the

power

receptable

at

the

rear

of

the

instrument

indicates

the

line

voltage

for

which

the

instrument

was

wired

at

the

factory.

If

wired

for

117

volts,

the

instrument

will

operate

properly

with

line

voltages

be-

tween

approximately

105

and

125

volts.

If

wired

for

234

volts,

the

instrument

will

operate

properly

from

approximately

210

to

250

volts.

Jo

change

the

power

transformer

connections

for

opera:

tidn

on

another

line

voltage,

change

the

location

of

the

bare

wire

straps

at

the

primary

terminals,

It

is

not

necessary

to

move

any

of

the

plastic

insulated

wires.

Place

the

new

straps

in

accordance

with

the

markings

on

the

tag

located

fon

the

power

transformer

side.

When

a

suitable

location

has

been

chosen,

set

the

POWER

ON

switch

to

the

off

position

and

connect

the

instrument

to

{an

appropriate

source

of

power.

Place

the

desired

vertical

plugin

unit

(for

example,

the

Type

3A2

or

3876)

in

the

left

plug-in

compartment

of

the

oscilloscope

(see

Fig.

2-1).

Place

the

horizontal

plug-in

unit

(for

example,

the

Type

382

or

3177)

in

the

center

compartment.

Finally,

place

the

desired

digital

unit

(for

example,

the

Type

éRI

or

6RIA)

in

the

right

compartment

of

the

oscilloscope.

Make

certain

all

units

are

properly

inserted

and

locked

in

place

before

turning

on

the

oscilloscope

power.

The

horizontal

and

vertical.

plug-in

units

are

locked

in

place

by

turning

the

front-panel

knurled

‘aluminum

locking

knobs

clockwise.

The

digital

unit

is

locked

in

place

by

removing

the

right

side

panel

and

tightening

the

two

fasteners

at

the

rear

of

the

compartment.

Fig.

2-1,

Type

567

plug-in

co

yartments

Checking

Plug-In

Ui

Each

vertical,

horizontal

and

digital

plug-in

unit

must

be

calibrated

within

the

particular

oscilloscope

in

which

it

is

to

be

operated.

Units

purchased

as

a

system

(oscilloscope

‘and

three

plug-ins)

are

calibrated

together

as

a

system

at

the

factory,

Units

purchased

separately,

or

calibrated

separately,

must

have

their

basic

gain

adjusiments

made

when

they

are

installed

Accuracy

Individual

oscilloscope

crt

deflection

factors

differ

within

normal

limits.

The

vertical

and

horizontal

units

have

front:

panel

Calib

controls

so

the

particular

amplifier

gain

can

be

set

to

that

needed

by the

crt.

Some

sampling

plug-in

units

have

internal

digital

gain

controls

that

must

be

correctly

adjusted.

See

the

individual

plug-in

unit

instruction

manval

calibration

procedure

for

details.

The

digital

unit

is

sensitive

to

the

oscilloscope

power-supply

voltages.

Digital

readout

accuracy

is

closely

related

10

power-supply

voltage

accuracy.

Since

it is

impossible

to

21

Operating

Instructions—Type

567

make

all

Type

567

Oscilloscope

power

supplies

to

have

exactly

the

same

voltage

accuracy,

the

digital

unit

must

be

calibrated

in

the

oscilloscope

in

which

it

is

used.

If

a

cali-

brated

digital

unit

(either

Type

6R1

or

6RIA)

is

placed

into

another

Type

567

Oscilloscope,

check

the

accuracy

of

the

start

and

stop

voltages

and

the

rate

of

rise

of

the

voltmeter

ramp

before

relying

on

either

time

or

voltage

readout.

See

the

digital

unit

instruction

manual

calibration

procedure

(Type

6RIA

steps

5

and

6;

Type

6R1

steps

15

and

17}

for

details.

Intensity

Control

The

INTENSITY

control

is

used

to

adjust

the

brightness

of

the

oscilloscope

display.

Begin

with

INTENSITY

control

counterclockwise,

because

some

plug-ins

permit

a_

bright

spot

during

warm

up.

After

turning

on

the

instrument

and

waiting

a

few

minutes

for

warm

up,

free

run the

oscilloscope

sweep

by

setting

the

TRIGGER

SENSITIVITY

or

LEVEL

control

fully

clockwise.

Adjust

the

INTENSITY

control

for

a

suitable

trace

intensity.

Do

not

leave

a

bright,

sharply

focused

spot

on

the

crt

screen

for

a

prolonged

period.

An

excessively

bright

sta-

tionary

spot

may

damage

the

crt

phosphor.

Focus

and

Astigmatism

Controls

The

FOCUS

and

ASTIGMATISM

controls

are

used

in

con-

junction

with

each

other

to

produce

a

well-focused

display

on

the

oscilloscope

screen.

Because

changes

in

the

setting

of

the

INTENSITY

control

may

affect

focus

slightly,

the

trace

should

be

focused

with

the

actual

waveform

displayed

and

with

the

desired

intensity

setting.

Refer

to

the

appropriate

plug-in

manuals

for

instructions

for

applying

a

signal

to

the

oscilloscope

and

obtaining

a

stable

display.

With

a

signal

displayed,

carefully

adjust

the

FOCUS

and

ASTIGMATISM

controls

alternately

for

best

possible

focus

over

the

entire

display.

There

is

an

intensity

level

above

which

a

good

focus

is

impossible

to

attain.

Scale

Illumination

Control

The

ert

graticule

is

edge-lighted

by

two

small

lamps

at

the

bottom.

The

lighting

can

be

adjusted

to

suit

the

ambient

light

conditions

by

means

of

the

SCALE

ILLUM

control.

Rotating

the

control

clockwise

increases

the

brightness

of

the

graticule

scale

markings.

The

graticule

is

marked

with

eight

1-centimeter

divisions

vertically

and

ten

1-centimeter

divisions

horizontally,

with

2-millimeter

markings

on

the

centerlines.

Changing

Plug-In

Units

Horizontal

and

vertical

plug-in

units

used

in

the

Type

567

may

be

changed

at

any

time.

However,

it

is

recommended

that

the

instrument

be

turned

off

while

a

change

is

made.

This

affords

maximum

protection

to

the

oscilloscope

and

other

plug-in

units

against

sudden

transients

and

load

changes.

Whenever

a

horizontal

or

vertical

plug-in

unit

is

changed,

it

is

important

that

you

check

both

the

gain

and

timing

of

the

oscilloscope.

This

will

ensure

accurate

measurements.

2-2

Se

LR

Ao

Amplitude

Calibrator

(SN

2060-up)

The

Amplitude

Calibrator

provides

a

choice

of

four

square-

wave

voltages

with

amplitude

tolerance

of

+2%.

0.5

and

5

volts

peak

to

peak

when

loaded

(one

or

both

at

the

same

time)

by

100k

or

greater,

and

50

and

500

mv

when

loaded

(one

at

a

time)

by

502

+1%.

Two

frequencies

are

avail-

able:

crystal-controlled

20-kc

{=:0.1%)

square

waves,

and

1-ke

(--20%)

square

waves.

The

two

frequencies

are

select-

able

by

a

front-panel

20

KC-==1

KC

toggle

switch.

The

volt-

age

accuracy

of

any

one

of

the

four

output

voltages

may

be

adjusted

to

within

—%%

by

special

calibration.

The

Amplitude

Calibrator

is

valuable

for

adjusting

the

front-panel

Calib

controls

of

both

vertical

and horizontal

real-time

or

sampling

plug-in

units.

The

20-ke

frequency

(and

the

ability

to

make

one

of

the

output

voltages

very

accurate}

permits

checking

the

system

operation

including

digital

unit

time

and

voltage

readout.

The

1-ke

frequency

is

valuable

for

compensating

low-frequency

attenuator

probes.

Front-panel

BNC

connectors

permit

convenient

50

cable

connection

of

calibrator

signals

to

the

plug-in

unit

input

terminals,

or

to

external

equipment.

If

the

vertical

plug-in

unit

has

a

high-impedance

input,

the

two

higher

square-wave

voltages

will

apply.

Addition

of

an

external

50Q

termina-

tion

(Tektronix

Part

No.

011-0049-00)

at

the

plug-in

input

connector

will

provide

the

two

lower

voltages.

If

the

plug-in

unit

has

an

internal

50

Q

termination,

do

not

add

the

external

termination

when

accurate

voltages

are

desired.

(Actually,

the

Amplitude

Calibrator

is

short-circuit

proof,

so

any

load

is

permissible,

but

accurate

voltages

are

obtainable

only

as

above.)

The

+Pre

Trigger

connector

delivers

a

positive

pulse

ap-

proximately

4

cycle

before

each

positive

step

of

both

the

20-kc

and

1-kc

square-wave

signals.

Sampling

plug-in

time-

base

units

can

effectively

use

the

+Pre

Trigger

signal

(at

20

kc)

for

external

triggering.

A

positive

step

will

then

appear

near

the

beginning

of

the

display,

produced

without

external

delay

cable

in

the

pretrigger

signal

path.

(S/N

300-2059)

The

Amplitude

Calibrator

provides

a

choice

of

four

square-

wave

signals

with

peak-to-peak

voltages

of

0.05,

0.5,

5

and

50 volts

--3%

when

loaded

by

1

megohm

or

greater.

In

addition,

a

signal

of

100

mv

peak

to

peak

+3%

into

a

502

(1%)

resistance

is

provided

from

the

0.5

jack.

This

voltage

is

valuable

for

checking

the

vertical

calibration

of

sampling

plug-in

units.

Frequency

of

the

square

wave

is

that

of

the

power

line.

(S/N

101-299)

The

Amplitude

Calibrator

provides

a

choice

of

four

square-

wave

signals

with

peak-to-peak

voltages

of

0.05,

0.5

5

and

50 voits

+3%

when

loaded

by

1

megohm

or

greater.

Fre-

quency

of

the

square

wave

is

that

of

the

power

line.

The

Amplitude

Calibrator

is

valuable

for

checking

real-time

plug-

in

unit

calibration

and

the

compensation

of

attenuator

probes.

It

is

also

valuable

as

a

time

reference

for

adjusting

the

horizontal

unit

calibration;

three

complete

cycles

at

60

cps

line

frequency

occur’

in

50

milliseconds

(2

cycles

at

50

cps

line

frequency

occur

in

40

milliseconds).

SHORT

N

N

0

S

wv

o

4

€

4

=

oc

2

Kj

wu

a

Zz

wi

wu

2

wy

/

PP

/

Qax

L

“

/

wn

~

ae

s/

-

g,

-

~

<q

a

z

°r

w

£

/

of

T

T

TT

T

TTT

T Lo

|

t‘)

25

50

75

LOAD

CURRENT

OF

ONE

PLUG-IN

UNIT

(Milliamperes)

Fig.

2-2.

—100-volt

supply

shunt.

Skeleton

Plug-In

Units

Skeleton

plug-in

units

for

the

vertical

and

horizontal

sec-

tions

are

available

for

all

of

the

Tektronix

Type

560

Series

oscilloscopes,

including

the

Type

5467.

None

are

available

for

the

large

plug-in

area

used

for

digital

readout.

These

skele-

ton units

permit

you

to

build

your

own

plug-in

circuitry

for

use

in

the

Type

567.

If

you

use

your

own

circuitry,

pro-

vision

may

be

made

for

operating

the

digital

readout

cir-

cuits,

although

this

is

not

necessary.

Order

the

skeleton

chassis

as

Modification

Kit

number

040-0245-00

from

your

local

Tektronix

Field

Office.

A

dummy

cover

is

available

for

the

digital

cell.

Order

by

Tektronix

Part

No.

016-0051

-00.

Power

Supply

Capabilities

The

total

de

power

available

for

vertical

and

horizontal

plug-in

use

is

85

watts

divided

between

four

regulated

sup-

plies.

The

remaining

power

available

must

be

reserved

for

the

digital

units.

Use

of

current

from

any

of

the

unregulated

de

supply

leads

is

not

recommended.

The

four

regulated

de

supplies

listed

in

Table

2-1

are

em-

ployed

by

the

X

and

Y

axis

amplifiers.

Since

the

Type

567

indicator

unit

employs

two

plug-in

units

to

operate

the

X

and

Y

axes

of

the

crt,

currents

listed

in

Table

2-1

are

normally

divided

between

them.

However,

a

single

plug-in

alone

can

be

used,

such

as

a

vertical

ampli-

fier,

with

moving-film

recording

used

instead

of

a

horizontal

sweep.

In

such

a

case,

it

will

be

necessary

to

elevate

the

crt

horizontal

deflection

plates

to

approximately

+180

to

On

Operating

Instructions—Type

567

TABLE

2-1

Type

567

Power

Supply

Current

Capabilities

For

X

and

Y

Plug-In

Units

Supply

Max.

Total

Connector

Current

Terminals

Reg.

—100

vdc

130

ma

23—

to

9

ground

Reg.

—12.2

vdc

1.5

amps

16—

to

5

ground

~

Reg.

+125

vde

_

150

ma

15+

to

9

ground

Reg

+300

vde

150

ma

10+

to

9

ground

5

amps

per

Unreg.

6.3

vac

plug-in

1-2

+210

volts

de

to

permit

proper

focus

and

astigmatism

control.

The

limit

of

the

amount

of

power

which

can

be

dissipated

in

one

plug-in

unit

is

based

primarily

upon

the

ambient

temperature

and

amount

of

ventilation

supplied.

Vacuum

tubes

should

not

be

operated

with

envelope

temperatures

above

150°

C

when

the

ambient temperature

is

at

25°

C,

or

above

175°

C

when

the

ambient

temperature

is

at

50°

C.

The

Type

567

indicator

unit

can

be

operated

in

ambient

temperatures

up

to

45°C.

Separate

terminals

are

provided

for

the

ground

return

of

the

—12.2-volt

regulated

heater

supply.

When

using

this

supply

in

your

own

plug-in

design,

it

is

best

to

run

two

leads

to

the

heater

terminals

so

that

the

ground

lead

can

be

connected

directly

to

terminal

5,

thus

eliminating

ground

currents.

SHO

°

N

of

~

BS)

~

S

Zz

¥

=2«

v4

=

i!

z

/

|

br

x/

|

=

ey

|

a

o/

|

oc

Oak

f

a

/

a

y

|

wi

4

ac

|

-

/

,

|

<

/

=

J

|

of

|

qT

qT

T

T

qT

Li

LU

T L

qv

Lu

qT

0

25

50

75

LOAD

CURRENT

OF

ONE

PLUG-IN

UNIT

(Milliamperes)

Fig.

2-3.

+

125-volt

supply

shunt.

2-3

Operating

Instructions—Type

567

SHORT

2°

of

-)

Ry

S

2

€

z

=

2

w

z

Ww

Ww

= A

a

/

|

Pi

7

Oak

¥

4

:

wn

a

7

|

K

7

5

oy

|

>|

7

|

w

a

of

T

J

q L

1

v

1

T

T

T

J

T

25

50

75

LOAD

CURRENT

OF

ONE

PLUG-IN

UNIT

(Milliamperes)

Fig.

2-4.

+300-volt

supply

shunt.

above

150°

C

when

the

ambient

temperature

is

at

25°

C,

or

above

175°

C

when

the

ambient

temperature

is

at

50°

C.

The

Type

567

indicator

unit

can

be

operated

in

ambient

temperatures

up

to

45°C.

Separate

terminals

are

provided

for

the

ground

return

of

the

—12.2-volt

regulated

heater

supply.

When

using

this

supply

in

your

own

plug-in

design,

it

is

best

to

run

two

leads

to

the

heater

terminals

so

that

the

ground

lead can

be

connected

directly

to

terminal

5,

thus

eliminating

ground

currents.

TABLE

2-2

Recommended

Type

567

Regulated

Power-Supply

Shunt

Resistors?

Shunt

Resistor

Values

—100v

+125

v

+300

v

No

Shunt

|

0

to

25ma|

0

to

45ma|

0

to

40ma.

20009,

5w_

be-

tween

proper

ter

|

99

+9

45ma|25

to

60ma

35

to

67ma

minals

of

power

connector.

_

SHORT,

between

proper

terminals

of

pow-

|

40

to

65ma/50

to

75

ma

|65

to

75

ma

er

connector.

1Currents

listed

are

one-half

total

available,

based

on

two

plug-

in

units

being

used.

Suggested

Power-Supply

Shunt

Resistor

Values

To

make

efficient

special

use

of

the

Type

567

indicator

unit

power

supply,

the

load

currents

and

maximum

or

mini-

mum

load

values

must

be

known.

2-4

os

wie

|

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pote

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Le

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gt

Terminals

X,

Y¥,

and

Z

are

located

in

plug-in

units

X

=

+300-Volt

Shunt

Y

=

+125-Volt

Shunt

Z

=

—100-Volt

Shunt

Fig.

2-5.

Power-supply

shunt

resistor

connections.

The

nature

of

series-regulated

power

supplies

permits

ob-

taining

more

current

from

them

than

can

normally

be

handled

by

the

series

tube

alone

(providing

the

power

transformer

and

rectifiers

can

supply

more

current).

By

placing

a

shunt

resistor

of

appropriate

value

across

the

series

regulator

tube,

additional

current

can

be

made

available

for

the

load.

The

correct

value

shunt

resistor

must

be

chosen

to

permit

the

regulator

system

to

deliver

current

with

low

ripple,

and

the