HP 120A, 120AR Service and user manual

HP Archive

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OPE

RATING

AND

SE

R··V

IC

IN

G MAN UAL

MODEL

OSCILLOSCOPE

SERIALS

Stock No. 120A·900

PREFIXED:

120A/AR

051

-

Copyright 1501 PAGE Mn..L

HEWLETT-PACKARD COMPANY 1958

ROAD,

PALO ALTO, CALIFORNIA,

U.S.A.

00016-2

SWEEP

Sweep Range:

Sweep Expand:

00016-2

SPECIFICATIONS

1 IJ-sec/cm

±

5%,ina permits extends

X5

sweep

toatleast

1,2,5,10

continuous

the

200

millisec/cm

expansion

0.5

...

sequence,

sec/cm.

15

5 J.Lsec/cmto200

adjustmentofsweep

steptoat

maybeusedonall to 1 J,J.sec/cm. Expansionisabout sweep

accuracy

is±10%.

calibrated

time

least

0.5

ranges

the

centerofthe

sweeps,

millisec/cm.

between

sec/em.

and expands

Model 120A

accuratetowithin

Vernier

calibrated

steps

fastest

CRT

and expanded

and

sweep

Synchronization:

Trigger

Point:

VERTICAL AMPLIFIER

Bandwidth:

Sensitivity:

Internal

Calibrator:

Input Impedance:

Balanced

Input:

Automatic causing

2.5

volts

Zero positiveornegative ated

between

automatic

DC coupled: de to200 kc.

pendent of

10

millivolts/cm

±5%, 10

from50cpsto250kc;

1/2

emormore

peak-to-peak,

crossing,

control

-10

negative

overrides

to

+10

volts.

operation.

sensitivity

to

mv/cm,

100

vertical

and

from

slopeofexternal

slopeofvertical

automatic

Turning

ACcoupled:2cps

setting.

100

volts/cm.

mv/cm,

tinuousadjustmentofsensitivity at

least

100 v

/cm.

Calibrating ardizing

1 megohm,

On 10

signal

of gain,

approximately

mv/cm

automatically

accuracy

range.

±

2%.

50 pf

Input

impedance2megohms

internally

deflection; line

from

voltage.

deflection

and

permits

fully

counterclockwise

to 200

Four

calibrated

1

V/Cfi,

and 10

between

v/cm.

steps

connectedtovertical

shunt.

vertical

external

sync

signals.

the

deflection

signalsatleast

signals,

Screwdriver

trigger

into

kc.

Bandwidthisinde-

steps

Vernier

and

extends

10 v

amplifier

shuntedbyapprox.

zero

crossing,

pointtobe

auto

restores

accurate

perm~ts

/ern

for

signals.

oper-

set

within

con-

step

to

stand-

25 pf.

Common Mode

HORIZONTAL

ii

Rejection:

Phase

Shift:

AMPLIFIER

Bandwidth:

Sensitivity:

Input Impedance:

Phase

Shift:

Rejectionatleast

Vertical

± 2

DC coupled: dc

independent of

0.1

0.1 of

1 megohm,

Horizontal

± 2

and

0

to

horizontal

100 ke when

volt/cmto100

v/cm,1v/cm,

sensitivity

between

nominal,

and

0

to 100 kc when

attenuator

vertical

40db.

verniers

to

200

Common

amplifiers

mode

are

fully

kc.

AC coupled: 2

have

setting.

volts/em.

and 10

steps

Threecalibratedsteps,

v/cm.

and

Vernier

extends10v/cm

shuntedbyapproximately

amplifiers

verniers

are

have

fully

signal

must

same

phase

clockwise.

permits

same

phase

clockwise.

notexceed±3volts

characteristics

peak.

within

cpsto200 kc. Bandwidth

accurate

continuous

steptoat

within

least

±5%,

adjustment

100

v/cm.

60 pf.

characteristics

within

is

Model 120A

00016-2

GENERAL

Intensity Modulated:

Illuminated

Cathode Ray Tube:

CRT Bezel:

CRT

Plates:

Filter

Supplied:

Graticule:

SPECIFICATIONS

5AQPl tial. for

Light moved

Direct approximately

mono-accelerator

P7

and

Pl1

special

applications.

proof

easily·

bezel

for

connection ·to deflection

20 v

Terminalsonrear.

Coloroffilter Green

Amber Blue

withPiand

with

with P

compatible

P7

11

Edge lighted with squares.

Major

(Cont'd)

normally

phosphors

provides

are

firm·· mount

quick change of

supplied; 2500 volt

also

filter.

plates

/cm.

+20

volts to blank

with

CRT

Phosphor

P2

conttolledillumination,

hori

?;on

tal

and

vertical

available.

for

via

P2isavailableifdesired

oscilloscope

terminalsonrear.

traceofnormal

supplied:

10 em x 10 crn, axes

have 2

accelerating

camera

andisre-

Sensi~ivity

intensity.

marked

mm

sulxlivisions.

poten-

incm

Dimension,s:

Weight:

Power:

Equipment Slides:

Cabinet Mount:

Rack

Mount:

Cabinet

Rack

Mount: Net 34 Ibs; shipping

Mount: Net32lbs;

115/230 volts ±

9-3/4

I

'8

10%,

Canbeinstalledatthe mount

from

equipment

in. Wide,

15-5/8

in. high,

20-3/4

---l

J-!=;;;:=~===::!....I

-----1-20-AR

shipping 48

50-1000

cps;

130

factoryonspecial rack.~Specification COl 120AR.

1~

431bs.

lbs.

watts.

order

64

for

easy

in. deep.

withdrawalofrack

Accessories

Available:

AC-83A Viewing Hood;

face-fitting

molded

rubber.

iii

CONTENTS

SECTION

I

II

m

GENERAL

1 - 1

1 - 2

1 - 3

OPERATING

2 - 1

2 - 2

2 - 3

2

-4

2 - 5

CmCUIT

3 - 1

3 - 2

3 - 3

3 - 4

3 - 5

3 - 6 3 - 7

3 - 8

General Damage in Power

Controls Synchronization . . • Calibrator. ACorDC Operating

DESCRIPTION

General Over-All Vertical Horizontal Sweep Low Voltage High Voltage Calibrator.

DESCRIPTION

Information

Transit

Cord

INSTRUCTIONS

and

Coupling Procedures

Content

Operation

Channel . .

Channel

Generator

Power

. . . . .

....

Terminals

. . . . .

•. Supplies Supply

• . . . . .

Page

I - 1

1-2

I - 2

.

..

II 1

II - 1

III

- 1

III - 1 III

- 2 III - 3 III - 3 In

- 5

III

- 6 III - 6

SECTION

IV MAIN'TENANCE

4 - 1

4 - 2

4 - 3

4 - 4

4 - 5

4-6

4 - 7

4 - 8

4

...

9

4 - 10

11

4 -

12

4 - 13

V

TABLE

5 - 1

Introduction . • . . . . • . . . . .

Removing the Cabinet Connecting Tube Isolating Condensed Adjustment Turn Power Trigger

Vertical Horizontal Sweep

OF

REPLACEABLE

TableofReplaceable

....•.•

for

230-Volt

Replacement

TroublestoMajor

Test

and Adjustment

Procedure

On.

• • • • . . • • • • • .

Power

Lines

. . . . . . . • .

Sections

Procedure

• . • • .

Supplies • • • • • • • • •

Generator

Amplifier

• . . . . . . . .

. . . . .

Amplifier

Generator

• . . . . •

PARTS

Parts

f::"

.

• • • . • . . . . .

..

IV - 1

IV

- 1

IV - 1

IV

- 2

IV - 3 IV - 5

IV

- 5

IV - 5

IV - 6 IV

- 7

IV - 8

IV

- 9

V

-.1

Sect. I

Page

1

1-1

GENERAL

The Model120Adcto purpose accelerator

be

canbeeither anditcanbeobtainedineither type mounting. balanced directly direct havingtoresort vertical amplifier jecting

The Section mentofthe Oscilloscopeiseasytooperate.

Someofthe are

oscilloscope

used

with

input,

with

presentation

amplifi.er may

amplifying

extraneous

operationofall

II.

Because of

panel and conventional-designations,

as

follows:

INFORMATION

200

kc Oscilloscopeisa

employing

precision

either

.internallyorexternally

transducers,

special

type

cathode-ray

internalorexternal

Because

the

to

·0£

its

Model 120A

enabling

of

phenomena

preamplifiers.

also

be used

the

desired

induced

panel

the

features

signals.

controlsisdiscussed.in'

straight-forward

general

a 5AQP-

tube.Itcan sweeps which synchronized

the

cabinetorrack

high sensitiVity

may

oftenbeused

youtosee

desired as·adifferential

signals

of

this

without

The

balanced

and

arrange-

oscilloscope

mono-

and

re-

the

X5

You speed expanding a two

10

centimeters

sweep

settings

1

microsecond/

UNIQUE

a

No

timeiswasted

~

Model 120A,

chronizingsignal The facilitates

niZing triggers

on the CRT in The automatic

qUickly

established.

front

screwdriver.

GENERAL

SWEEP

automatic

panel

EXPANSION

observation

for

expander,

and

expands

AUTOMATIC..TRIGGERING

it's

trigger

establishingabase

signalisnot

the

sweep

the

baseline

locked-out

This

whereitis

and

centimeter

easy

viewing of

may

be

the

cm.

adjusting

automatic,

to

obtainastable,

ends

present

generatortoprOVide a

.absence of a synchronizing

provision

andanadjustable

lockoutislocated

easily

SECTION

I

DESCRIPTION

analysisoftransients

segmentofthe

detail.

usedonall

fastest

trigger

just

hunting

line

because

accessible

sweep

controls

connect

steady

for

when a

may be

trigger

just

sweep

the

synchro-

this

easily behind the

by trace This

X5

time

on the

the

syn-

trace.

spot

and

circuit

baseline

signal.

and

level

with

to

a

DIRECT When

avoided direct selects to

200 sensitivityofthe controlofsweep between control sweep sensitivityofthe10volt/em amplifiertoat

LINEAR

The from a feedback type order

erator characteristics

READING

you

are

using

and

possibilities reading, 15calibrated· sweeps

milliseconds/cmor

calibrated

which

timetoat

mTEGRATOR

accurate

linearity

is

also

direct

more

calibrated

horizontal

time

extends the 200

least

and

stability.

reliable

than

SWEEP

the

and

stepsisprOVided by a

0.5

100

volts/em.

SWEEP

reading

integrator

other

types of sweep

TIMES

120A

computations

of

error

sweeps.

from5microseconds/em

determines

amplifier.

horizontal

sec/cm

This typeofsweep

and

are

reduced

A

single

the

calibrated Continuous sensitiVity

vernier

milliseconds/em

and

lowers

stapof

sweeps

the

horizontal

GENERATOR

are

obtained

w~lich

insures

independentoftube

a high

generator.

knob

are

by

the

gen-

CALIBRATED

Accurate voltage forms fiers

A

permits vertical

Phase with frequencies.

vertical

2°

CABINET

The~Model

cabinet

rack

equipment

required

are

built-in

shift

this

at"

100

mount

quickly

calibrated

calibrator quick amplifier

measurements

oscilloscope

and

kc.

AND RACK

mount

for

rack.

for

the

AMPLIFIERS

measurements

made

and

whichisaccurate

verification

sensitiVity.

overawide

Relative

horizontal

MOUNTrnG

120A

Oscilloscopeisavailable

for

benchorportable

installationina"

Only 7

120AR

anditmaybesupported

on.all

with

the

accurate

and

canbemade

p"hase

amplifiers

inchesofrack

kinds

of wave-

120A, t.he

standardization

range

shift

standard

ampli-

within

within±2%

accurately

of input

between

is

less

use

andasa

19

space

±5%.

the

than

as inch

in

of

a

is

Sect.I Page, 2

the

rackbythe withdrawal electrically placement,

The

equipment

mount

from

identical and

this

modelatextra

stalledatthe

1-2

DAMAGE IN

After unpacking damage Damage

become

in Shipment"

sheetinthis

front

the

rack.

paneloron

Since both

differ

slides

onlyinmechanical

book appliestoboth models.

slides

factoryonspecial

are

cost.

available

They

order.

for

can

TRANSIT

this

instrument should any shipping

eVident,

refertothe"

paragraph

on the

manual.

for

easy

models

the

are

rack

alsobein-

Claim

for

warranty

1-3

POWER

The

three

instrument

CORD

conductor power cable supplied with the

is

terminatedina polarized

male connector recommended

trical

Manufacturer's tactisan two-blade chassis To

use

an

adapter

offset

ac

plug which

when used with the

this

plug in a

shouldbeusedtoconnect

plug to the two contact

is

used

the

ground

lead

from

the

adapter

suitable

a

ground

Association. The

round

grounds

standard

system.

connection

which

for

the

protectionofoperating

personnel.

three

by

the National

added

appropriate

two

to a

the

instrument

receptacle.

contact

the

When

the

becomesashort

canbeconnected

prong Elec-

third

standard

outlet

NEMA

adapter

con-

to

Sect. n

Page

1

2-1 CONTROLS

RefertoFigure the

panel

controls

2-2

The synchronize power

In

the First, of the cathodethe SYNC switch to tive going (INT+) the zero GER

Further ger the

The circuit

ray signalisfedinthe input of the

SYNCHRONIZATION

Model 120A

in

line

frequencyorfromanexternal

addition,inthe internal synchroniZation positions,

slope

and

the polarity·of the presentation

waveform.

voltage

LEVEL

level

sweep

120A

tube in

the

frequencyofthe

levelisnot

rotation

point on the incoming waveformatwhich

will

features

presentsatrace

the

sweep

and

AND

2-1

foracomplete

and

Oscilloscope

reference

trigger

ray

tube start

ora

If

automatic

control

of the

start.

automatic

absence

triggers

TERMINALS

explanation of

terminals.

maybeadjusted

to

the

input

level

point

maybeadjusted.

on

may

be

adjustedbyturning

the sweep'on

negative going

sweep

desired,

out of the AUTO

control

sweep.

on the face of the

of an input. As Soon

the

signal

the

input

signal.

eitheraposi-

(INT-)

triggeringata

rotate

will

adjust

takes

sweep

signal,

the

the TRIG-

position.

the

This

cathode-

control

generator

to

the

signal.

screen

part

of

trig-

special

as

at

OPERATING

2·4AC

AC

coupling

out

regard sition coupledtothe removes coupling 2

cps.

waves below 200 cp.sitis

Uog4.

PONENT THE ARE UNABLE

VEltTICALPOSlTION

LING. When

be applied

2-5

Basic drawings cabinet model but

model is

different.

a

The

first

are

arranged

the

variations

An

indextothese

OR

for

tbe input signal

the

circuit

To avoid

WHEN

MAYBE

TRACE

is

OPERATING

operating

that

except

two

INSTRUCTIONS

D·C

COUPLING

permits

thede amplifier

dc

USING

OFF

AC

600 volts.

follow.

that

procedures to supplement the

high

gain

level

involved.

(vertical

through a

component

has

a low

degr

ading

advisable

,DC

COUPLING

LARGE

THE

TO

FIND

coupledthe

procedures

are

the

possibleinusing

illustrations

ENOUGHTODEFLECT

FACE

THE

CONTROL

PROCEDURES

Directions

the

same

placement

are

SECTION

to

be employed

In

or

horizontal)

capacitor

from

the input.

frequency

input

pulsesorsquare

to usedc

THE

OF

CRT.

TRACE

TRY

maximum

are

illustrated

are

given

for

the

of

the

complete. The

-first

two by

the

oscilloscope.

follows:

with-

the

AC

po.-

which

This

cut-off

coup-

DC

COM-

IF

YOU WITH AC

dcthatmay

COUP-

rack

controls

shOWing

THE

in. the

for

mount

others

II

is

at

the

2-3

An

frequency of 400 cps,

tical 60

vertical

switch is

ontal amplifier and the fier ternal fier

CALIBRATOR

internal

amplifier

millivolt

made

calibration can be checked easily,

and

square-wave

calibration

outputisconnected

amplifier

is

placedinthe CAL. position.

for

internal

signal can be

then

appliedtothe

calibrator,

is

provided

accuracy.

when

the

connection between

calibrator.

measured

with a nominal.

for

checking

The

internallytothe

VERT.

on the

horizontal

SENSITIVITY

No

Horizontal

sinceanex-

vertical

ver-

calibrator

provision

thehoriz-

ampli-

amplifier.

FIG. 2-2

2-3 2-4 2-5 2-6

2-7

2-8 2-9 2-10

2-11 2-12

TITL-E

Internal

Internal AC External Vertical Vertical Internal ConnectiontoDeflection Intensity Aligning Scope Connecting Extend

Sweep-Internal Sweep-External

Coupling-Balanced

Horizontal Balance Sensitivity

Sweep

Modulation

Sweep

Adjustment

Calibration

Magnification

Trace

External

Time

Input

Operation

with

Capacitors

Synchronization Synchronization

Input

Plates

Graticule

to

<D

ROTATE

CLOCKWISETOTURNON•.•• IAH30SECOIDS.

THEN

ADJUST

TRACE

INTENSITY.

o

ROT

SET

FOR

I

VERT.

SET

TO

I

CAL.I

SWITCH

OUT

OF

RANGES

OF

I

SElECT

§JOR

SET

GAINOfVERTICAL

ATETOMOVE

SENsITIVITy]

FOR

CALIBRATING

[§g

POSITIONTOADJUST

VERT

SENSITIVITY

~

COUPLING

AMPLIfiER

TRACE

VERTICALLY.

DESIRED.

SIGNAl.-------"""""

I

SWITCH.

fOR

..

BETWEEN

VERTI~ALINPUT.

I I ==='{M\)

.....

@

0)

~

SET.

TO

I

SWEEP

TIME

I'

HORll.

POS.

DESIREDORTO

DESIRED

IHaRtZ.SENs·l

@

SWITCH

OUT

Of

~].

POSITIOIITOADJUST

'SWEEPTlMEI

OFF

SELECT~OR~COUPLING

(AC

COUPLING

....

OR

IHORlz.SENs·l

ONLY

WITH~SYNC

SETTOG

SET

10~FOR

BETWEEN

RANGES

Of

SWITCH.

(HORtZONTAl

SIGNALS.)

fOR

EXPANDED~SWEEP

INPUT).

UNEXPANDEDSWE

EP

REMOVE

SHORTING

ADJUST

fOR

OPERATION

BAR

WHEN

STATIONARY

VERTICAL

OF

I

VERT.

SENSITIVITVIIVERNIER

CONNECnNGABALANCED

POSITION

OF

TRACE

INPUT

WITH

I

SIGNAL

MAX.TONIN;

figure

TO

OBTAINAPATT.ERN

SHOWN

ANO

USE THtS TROUBLESTOMAJOR

PE,RfORMlHENUMBERED

SAME

PROCEDURE EUMIIATE

SECTIONS.

WHENEVER

FAULTS

WILL

2-1.

EASilY,

SET

THE STEPSINSEQUENCE.

DIffiCULTYISENCOUNTERED

DUETOMISALIGNMENIOF

front

Panel

CONTROLS

CONTROlS,AND

EXACTLY

INOBTAlHtNCA

.IlL

Control

AS

PATTERN.

ISOLATE

ANY

Diagram

LO-£-1558

Lo-r-IIU

SET SET SET

T01INT.+l

Tol

LINE

TO

(EXT.I

ROTATE

COUlTERClOCKWISE

(ROTATE

CLOCKWISETOADJUST

OR

I'NT-I

I

TO

SYNCHRONIZE·ATLINE

fOR

EXTERNAL

FOR

~

I

TRIGGER

fOR

INTERNAL

SYNCH~ONIZATION.

FREQUENCIES.

SYNCHRONIZATION.

SWEEP

LEVEL

I

).

Sect.n

Page

3

INTERNAL

SWEEP--INTERNAL SYNCHRON·IZATION

2

1.

Feed

vertical

terminals.

input (10

2. Set AC-DC

3.

Adjust desired

VERTICAL SENSITIVITY

sensitivity.

Remove

mv

switch

input

only).

signaltovertical

jumpertouse

for

type coupling

INPUT

balanced

desired.

control

for

Figure

4. Set SYNCHRONIZATION

+ .

or

- , depending upon

desired.

5.

Adjust

TIVITY

6.IfAUTOMATIC

TRIGGER

trigger

2-2

SWEEP TIME-HORIZONTAL SENSI-

control

for

desired

sweepisnot

LEVEL

controltoselect

point.

.

switch

to

INTERNAL

slopeoftrigger

sweep

speed.

desired,

level

point

rotate

of

Sect.n Page 4

INTERNAL

SWEEPIiEXTERNAL

SYNCHRONIZATION

1.

Feed terminals. put (10

2.

Set

.vertical input

Remove

mvonly).

AC

-DC

switchtotype of input coupling

signal

jumper

to

for

vertical

balanced

desired.

3.

Adjust desired

VERTICAL SENSITIVITY

deflection.

control

4. Feed external synchronization signal to zontal input

terminals

(accoupling only with

external synchronization).

input

in-

for

hori-

Figure

4

7

5. Set SYNCHRONIZATION switch to EXTERNAL.

6.

Adjust SWEEP TIME

7.

TIVITY

set

MATIe

control

TRIGGER

sweeporrotate

controltodesired

This

procedure

is

observe phenomena occurring 2-3

HORIZONTAL

for

desired

LEVEL

trigger-level

useful

SENSI-

sweep

control

TRIGGER

speed.

to

AUTO-

LEVEL

point.

whenitis

desired

at random intervals.

to

Sect.II

Page

5

AC COUPLING-BALANCED

INPUT

1.

set 10 higher

2.

Set

Disconnect

3.

3

VERTICAL SENSITIVITY

millivolts/em,

ranges.

AC-DC

switch

shorting

input not

to AC.

strap.

control

balanced

to

on

Figure

4. ConnectO.1 red

terminal.

5. Connect input

microfarad

signaltoA and

6. Ground inputatthe The

capacitor

must

2-4

be

black

used

ROle

capacitor

B.

terminal.

to

block

to bottom

any

dc.

Sect.nPage

6

EXTERNAL

VI"NI!;;;""

VERT.

-----

SENSITIVITY

CAL.~

CAl..

HORIZONTAL

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

SCALE

LIGHT

----:;

@

SWEEP EXPAND

XI~X5

SYNC.

+INT.

-

INPUT

1.

2.

Apply

Set

AC

desired.

signaltohorizontal

-DC

switch

for

type

input

terminals.

coupling

Figure

3.

Set

SWEEP

SIVITY

4.

Adjust HORIZONTAL

2-5

TIME-HORIZONTAL

control

horizontal

for

position

desired

POSITION

ROIS

sensitivity.

of

pattern

control.

SENSI-

with

Sect.n

VERTICAL BALANCE ADJUSTMENT

Page

7

3

SCALE LIGHT

@

\.~

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

10

Set VERTICAL SENSITIVITY

2.

Turn

3.

Center

TICAL

VERNIER

trace

P OSITION

or

full

spot

SWEEP EXPAND

-1--+-~~~--""CAL

controltoOFF.

~L.

lCl~

X$

4.

5.

counter-clockwise.

vertically

control.

with

VER-

Repeat doesn't

20

10

I Z 5

jI

.'''Llst:~CAL.

Turn

VERNIER full clockwise.

Adjust

center

VERTICAL trace

or

spot.

steps2through

moveasthe VERNIER

DC

BALANCE

5 until the

controlisrotated.

ROle

trace

control

or

to

spot

Figure

2-6

Sect.n

Page·

8

VERTICAL SENSITIVITY CALIBRATION

1. SetVERTICAL SENSITIVITY

2. Set VERNIER to

3.

Adjust height

VERT. GAIN

of 6

CAL.

controltogive a

centimeters.

controltoCAL.

pattern

Figure

The

vertical

that

the

engraved SENSITIVITY whenever

the

position. 2-7

amplifier

markings

control

VERNIER

is

now

on the VERTICAL

are

accurate

controlisin

..

;

..

RO/S

calibrated

within

the

'.'~

so

±5%

CAL.

Sect.nPage

9

INTERNAL

VEaftl!lt

VERt SENSITIVITY

I

"00

!~

~.

OFF

CAL.t:L"

SWEEP

SCAt,.E

LIGHT

~

@

~I

swE£l'

.EXPANC

Xl

~5

M"AGNIFICATION

VERMIO

SWE£PTIME

HOR.

SEN

S.

~~~~--+--I----------.J'

1

1.

Set

2.

Position

troltoview

the

SWEEP EXPAND

the

trace

the

switchtoX5.

with the HORIZ.

desired

portion

of

POSe

the

con-

trace.

Figure

With

sweep cation

2-8

the

speed

divided

SWEEP

is

by

EXPAND

the

SWEEP

5.

switch

TIME

ROle

inX5,the

switch

true

indi-

Sect. n

Page

10

(

I

//

........_....•

CONNECTION

TOP

OFC~~._.

HORIZONTALJ.MEG.

AM~

•

~IIT_:

REARVIEWOFINSTRUMEN1:

HORIZ.

..

TO

DEFLECTION

VERT:

..

_/~~'_..

Z-AXIS

03

PLATES

._.

. ,

POSITIVE

DEFLECTS

..._

.....

AM~

UP02

_.

-...-

........

'\

I

· I

I

RO

CAUTION - Deflection

BEFORE

To

connectanexternal

AC

A.

1.

2. Connect 1 megohm

3.

The

trol

COUPLED

Remove

and

D4

of

the

COlUleet

to

terminals

put blocking capacitors toD3and D4.

PClUTION controls

the

D2

for

vertical

jumpers

the

pattern

the

jumpers

for

horizontal

removedinstep

vertical

D3

and

and good focus willbe maintained.

platesofcathode-ray

REMOVING

signaltothe

goingtoterminals

input

input.

1/2

watt

resistorsinplace

input blocking

D4 and

on

the

120A

tube

operateathigh dc potentials. TURN 120A

COVER PLATE FROM DEFLECTION PLATE TERMINALS.

deflection

and/or

1. capacitors

horizontal

will

still

D3

D1

and

in-

con-

Figure

plates:

B.

DIRECT

1.

Remove and

D4

2. Connect

to

D3

input

PQ9ITION controls will no longer control

Position voltages must be furnishedbythe signal source. plates

2-9

COUPLED

the

jumpers

D2

for

horizontal

for

vertical leads

from the

and

D4 and

directlytoDl

Best

picture

areat+275V

goingtoterminals

input

input.

vertical

the

lead

from

and

D2..

focusisobtained

with

respectto120A

and/or

input

the

OFF

D1

D3

and

directly

horizontal

pattern.

when

chassis.

INTENSITY MODULATION OPERATION

INTENSITY

MODULATION

INPUT

Sect. II Page

11

CD

-.

'-'

--

----.

.•

1

VIEW

OF'INSTRUMENT: I

.,..-

(ii

03

(;

---,

......

.-.'

--

_V-...;:ERTICAL

-'

-

..

-.

-"-'

W"

~"

..

..•

r/ I

AMP."

UP

-

.-

.........

1.0·M-'74

-_.

TOP OF CASE

-.

-'-. .

HORIZONTAL

_.

-.'

-

--'

..

-,-.

.

---....--..

/@",...-_·--_-OWIZ-AXIS

"".-

/'

i "

,

I

.

·

I

AMR@CD0

I

~..

02

POSITIVE

.k)

OEFLECTSRT T 03 POSITIVEOEFlECTS

R'EAR

"

"'

!

I

"

I

CAUTION loscope

TURN

MOVING THE

FLECTION

COMING

- The deflection

operateata dc potential above ground.

THE

IN

INSTRUMENT

COVER

PLATE

CONTACT

PLATE

TERMINALS,

WITH

plates

OFF

BEFORE

FROM THE

HIGH

of the oscU-

RE-

DE-

TO

AVOID

VOLTAGES.

Figure

To

intensity

1. Remove the

2. Connect the signaltothese

will

brighten

2-10

modulate

vertical

external

terminals

the

with

an

external

jumper

trace).

marked

intensity modulation

(a negative

signal:

Z-axis.

signal

Sect. II Page

12

ALIGNING

SCOPE

TRACEWITHGRATICULE

To align move

1.

2. Adjust fiber

oscilloscope

trace

from

with

cabinet;

Loosen locking clamp with screwdriver.

lever

to adjust positionofcathode-

ray

tube

in

both

radial

and

longitudinal

graticule,

then

re-

direc-

Figure

RO

tiona. CAUTIONHlq.H VOLTAGE. TAKE CARE

NOT

TO

TOUCH TERMINALS WHICH HAVE A

POTENTIAL

HIGH

When the tighten in

cabinet.

cathode-ray

locking

ON

clamp

THEM.

tubeisin

and

replace

desired

instrument

position

2-11

Sect.n

Page

13

CONNECTING

EXTERNAL CAPACITORS

TO

EXTEND SWEEP

TIME

,

I

0T~

EXTERNAL

CAPACITORS

To

extend the sweep

51DEOF

TOP

FRONT PANEL IN CABINET MODEL

OF

FRONT

time,remove

cabinet,

1. Connect external

capacitor

shown on SWEEP TDltE/CM switch.

2. Connect external

capacitor

to ground.

Values of both be determined that

the

only

capacitors

by

the sweep'speed

ranges

that

are

these

PANEL

across

IN RACK-MOUNT

chassis

capacitor

from

from point shown

the

same

and will

desired.

capacitors

Note

will

Figure

MODEL

affect

are

the

50,

·100

and

200

MICROSECONDS/eM

ranges.

The

extensionofthe

sweep

time proportiontothe amountofcapacity added to circuit.

in

the

capacitors

the

2

seconds/

This

For

example, since the

circuits

are.2and.

will

above

ranges

cm

respectively.

method will make

22 /lfd, using 2

increase

to

approximately.

no

largest

the

calibration

great

capacity

5, 1, and

sacrifice

linearity.

2-12

RO

is

in

the

}Lfd

of

in

Sect.

lIT

Page 0

AC-DC

SWITCH

AC

oI

VERT.

DC

/

/ IVERNIERI 0

/ I

INPUT

ATTENUATOR

~

IINT+I

SENSITIVITY

-----,---

AMPLIFIER

ISYNC I

I

IN

PUT

oI

VERT-

/

OUTPUT

AMPLIFIER

POS·I

TO

VERTICAL

DEFL. PLATES

+50V~"--

6•3V

f

GENERATOR

ITRIGGERLEVELI~---T·--

~.~~~

'1SWEEP

. IHORIZ.

TIME'

SENs.1

IHORtZ.SENS.1

IN

PUT

ATTENUATOR

'AUTO

,

\.

I

SWEEP

IVERNIERI

TRIGGER

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

I

oIHORIZ.pos·1

TIM£

Iq

q \

\ \

SAWTOOTH

GENERATOR

OUTPUT

AMPLIFIER

TO

HORtZ.

OEFL.PLATES

TO

VERI

IN

PUT

ATTEN.

CALIBRATOR

Figure

3-1.

Model

t

380V

+

roov

-ISOV

+

24

120A

LOW

VOLTAGE POWER

SUPPLY

V

Block

Diagram

TO

CRT

CATHODE

-

2250V

TO

CRT

--2300V

GRID

APPROX.

HIGH

VOLTAGE

PO

WER

SUPPLY

BO·L-71

Sect. III Page 1

3-1 GENERAL CONTENT

This

section over-all descriptions descriptions

3-2

The signal

A. VERTICAL

amplifies it, and drives the vertical deflection plates. It provides attenuation the supplies a signal

B.

signal or the signaland drives the horizontal deflection plates. The horizontal horizontal input signal, magnification sweep, the

C.

generator generator internally pulse generator. through erator self pulse before the action will of

OVER·ALL OPERATION

block

circuits

The

vertical

HORIZONTAL

The

either

from

spotonthe

SWEEP

The

which

has

off upon

from

t.he

'sweep

containsabrief

operation of

of

each

of

Schmitt

diagram,

in

AMPLIFIER

vertical

horizontal

the

and

sweep

receives

one

amplifier receives the input signal,

positionofthe

for

from

internal

amplifier

determines

screen.

GENERATOR

generator

and a sawtooth

or

externally,

initiates

The

sawtooth

complete

feedback which

the

completion of one cycle. Another

the

trigger

gene'rator

description

the

Model 120A Oscilloscope,

major

Figure

the

of.

internal

AMPLIFIER

amplifier

the

sweep

the synchronizing signal,

the

start

section

triggers.

3-1,

Model 120A

the input signal, determines

spot

synchronization.

horizontal

generator,

provides attenuation of the

the

horizontal

consists

generator.

and

action

generator

cycle.

generator

The

automatically

again. Thus the action

is

precisely

and

shows

on the

receives

input

convertsitinto a

of

the

Oscilloscope.

screen,

terminals

amplifies

of

the internal

position

ofa

The

the

sawtooth

will

sawtooth

shuts

will

be needed

controlled.

of

the

detailed

basic

and

an

input

trigger trigger

either

then

gen-

of

go

it-

SECTION

CIRCUIT

The sweep only is

received

waveform

Trigger

sists

ator.The

either chronization{+ source

the horizontal input

nization. The into a fast,

of which terminedbythe

MATICsweep

Sawtooth

consists

switch,

cathode

The pulse

start-stop

grator

nishesan

to

The integrator switch controls the action of the

tooth

integrator

voltage,

sweep

mitting

sweep. Sweep

resistance

sawtooth

grid

To

bias

the hold-off cathode follower, making the sawtooth

ge~erator

hold-off

Generator

ola

synchronizing

from the

for

the

start-~stop

will

of a

a

follower.

switch.

turn

the

integrator.

thereby

signalisreceived

the

resistor.

permit

voltageisapplied to· the

time.

starts

and

then onlyatthe

every

Generator

from

unblanking pulse through

trace

and capacitanceinthe

integrator

insensitive to incoming

time.

- The

synchronizing

vertical

or

-),

line frequency synchronization,.orfrom

terminals.for

trigger

constant

trigger

is

start-stop

sawtooth

trigger

outputiseffectively heldata

sawtooth

speedisdetermined

all

circuitstorecover

.generator converts

amplitude pulse

trigger.

t.he

trigger

not in use.

the

trigger

which in

The

on while the sweepisin

When

disabling

and the

DESCRIPTION

when a synchronizing signal

same

point

trigger

circuit

amplifier

from

The

trigger

level

The

trigger,

integrator,

generator turn

start-stop

this

the

this

integrator

voltage

generator

and a

trigger

receivesasignal

for

internal

an

internal

external

for

particular

generator

control, when AUTO-

sawtooth

controls

,trigger

the

switchisclosed

integrator.

switch

to

grid

start-stop

signals

generator

an

integrator

and

a hold-off

controls

gate

opens,

commence

by the value of

circuit

supplying the

afteratrace,

trigger

III

on

the

con-

gener-

-syo-

6.3

volt

synchro-

the

signal

operation

voltage

isd~....

the

inte-

also

fur-

inverter

progress.

saw-

the

reference

When a

per-

its

of the

by

during the

a

Sect.InPage

2

D. POWER

This

supplies

these

of voltage power supply

of

-2250volts

supplytothe

is

regulated

E. CATHODE-RAY

The

accelerator

P1

phosphor

P11

phosphors

P2isnot recommended because of low voltage. the

tubeiseasily

anode

the

plate

which you tical

makes

ment

whiCh

FOCUSorINTENSITY

terminals jumpersatthe connectionstothe

F.

CALIBRATOR

This

amplifier

60

mv

peak-to-peak

SUPPLIES

oscilloscope

supplying +380

supplies

are

is

for

the

cathode-ray

.input

tubesofthe

by

transistors.

cathode-ray

type.

screen

All

also

are

electrically

Itisnormally

butisavailableinthe and

c.hanged.

possibleasimple

requires

are

connected

rear

of the

plates

oscilloscope

can

calibrate

.ranges.Thecalibrator

square

has

two low

volts

and -150

fully

regulated.

regulated

and

tube. The filament

vertical

TUBE

tube

is

a

P2

upon

interchangeable

The

mono-accelerator

astigmatism

no

resetting

controls.

through

instrumentsothat

can be made

hasabuilt-in

the

sensitivity wave.

voltage

volts.

power

Both

The

hasanoutput

amplifier

5AQP-

supplied

mono-

with

P7

special

order.

accelerating

adjust-

when

adjusting

The deflection

removable

direct

easily.

calibrator

of

the

outputisa

high

and

with

ver-

3..3 VERTICAL CHANNEL

The

vertical

DC

switch,

section

amplifier

the

proper.

consistsofthree

input

attenuator

and

parts,

the

a·mplifier

AC-

A. INPUT AT'1'ENUATOR

The

Input

Attenuatorisa

having CALIBRATOR, 10 and 100 MU,LIVOLTS/CM,

1 and 10 VOLTS/CM and

OFF

switchisin the CALIBRATOR

the

amplifierisdirectly

the

calibrator.

calibrator

amplifier

of

6

centimeters,

BRATED

is

set

shouldbeadjustedtoshow a

position.

sensitiVityofthe

other

ranges,

ators.are These

attenuators between varied

continuously between VERNIER

sitivity

precision,

inserted

adjacent

control.

of any

Since the

to60millivolts,

with

oscilloscope.

ranges.

range

connectedtothe

the

This

frequency

aheadofthe

giveaten

T.his

downtoat

six

positio.n

positions.

position

When the

the

input of

output of

square-wave

output of

the

gain

pattern

VERNIERinthe

wUlcalibrate

When

the

usedonthe

adjusted vertical to

The

sensitiVity may be

one

attenuation

amplifier.

rangesbymeansofthe

control

reduces

least

the

tentoone.

switch

the

of

the

height

CALI-

basic

attenu-

sen-

Normally,

the

VERNIER

control

will be only in the CALIBRATED switch position..However, it

may be sensitivityofthe SENSITIVITY

position and adjusting the

sired

As

longasthe

ting

tivity. merely

calibratedtohave a known

ranges

fraction

all

ranges The

rotating

range

of the

VERNIER

will

original

switch

normal

have

sensitivity

the VERNIERtothe

fractionufthe

by

setting

to

VERNIER control

six

the

CALIBRATOR

centimeter

controlisleftatthis

the

same

fractional

may be

C.ALIBRATED

position. Foraccoupling

a

the signal coupling

2

cycles pulses and waves,

reached. waveforms whenever

has

per

occurs

path

a.1J.Lfd

bY

meansofthe

capacitorisswitched into

AC

-DC

switch.

a low frequency cut-offatapproximately

second. However, degradation of input

other

complex waveforms,

long

before

Therefore,

below

about

degradation

the

use

dc coupling

200

cycles

of

waveformissuspected.

suchassquare

cut-off

frequency for

per

Balanced input maybeusedbyremoving the to

the ground useful in applications where the

out-of-phase

terminal.

(differential)

Balanced input will be found

itisdesiredtoamplify

signal

and the in-phase (common mode) signalatthe This

rejectionisan

amplifiers suchasare

·Thus

you

can common-mode the

same

time

ential

portionofthe advantageous signals signals etc., to the siderably

picked

areofthe

areinthis

the differential

screen

of

over

The common-mode signal

(100

times). limitations points The

COMMON..MODE SIGNAL VOLTAGE

POSITIVE

EXCEED

NOT

PLITUDE In addition,

ential easiest nitude (ten The

amplifier 1

volt

must

be OR OF THE

it

input

withalower

waytodesensitizeupto

times)isto

peak-to-peakcan

inherent

usedinthe

reject

by

portionofthe

passing

signal.

very

often.

up

along

common-mode

class.

amplifiers

the

oscillosc.ope

propertyofdifferential

vertical

better

and

input

amplifying

This

Many of

with

desired

than

100

signal

will

the

type.

By

the

use

of balanced input

the

picture will

improve

that obtained using single-ended input.

rejectionisat

When using

be

maintainedonthe

NEGATIVE ON EITHER GRID MUST

3 VOLTS MINUS

may be found

balanceddeinput

met.

The

proper

input

THE

DIFFERENTIAL

desirabletouse

SIGNAL.

sensitivity

one

orderofmag-

use

SENSITIVITY VERNIER.

is

still

balanced

be

easily

and

signals

handled

the maximum common-mode signalisnot exceeded.

calibrated

VERTICAL

to

the

.de-

pattern.

set-

sensi-

restored

by

This

any

such

second

or

jumper

attenuate

same

time.

amplifier.

times

the

while

differ-

any

at

provetobe

unwanted

differential

Noise, hum,

obtained on

con-

least

40 db

certail)

operating

amplifier.

EITHER

PEAK

AM-

differ-

input.

The

up to

provided

is

Sect. m

Page

3

B. VERTIC

The of balanced differential last

two cross-neutralization. has

the adjustmentisa which two

adjusts

halvesofthe consist two

plates plates. Rl8,

adjusts

AL

AMPLIFIER

vertical

stages

are

balance and

potentiometer

the

stage.

of

potentiometers

which

adjust

The

screWdriver

the

basic

amplifier

consistsofthree

amplifiersincascade.

neutralized

The

first

stage, witb a l2AU7,

gain

adjustments.

in the cathode

current

distribution

The two

connected

the

resistance

adjustment,

gainofthe

by

plate-to-grid

The

between the

gain

adjustments

between

between the

VERT.

amplifier.

sets

The

balance

circuit

the

GAIN,

The front panel control, VERTICALSENSITIVrrY VERNIER' and VERTICAL SENSITIVITY anced potentiometer the

POSITION). The

fier,

sistance

gain

capacitor

quencyresponseofthis.stage.Inaddition,

nization

tube and fed into the

sweep

chronization.

?nly

IS

taken

for

3-4

The the and

A.

. In

Into

AC

~ontrols_

varIes

the gain between

differential

between

vertical

V3, a

position.ofthe

l2AT7,isthe

between

stability

and improved

across

signals-are

for

eitherINTERNAL+orINTERNAL-

Since

on.the

made

negative

so

that

inverted

from

INTERNAL+

HORIZONT

Horizontal

Amplifier

AC-DC coupling

the

Amplifier

AC

-DC

COUPLING SWITCH

the

.DC

position

the

grIdofthe

position

the

signals

the

gain

overaten-to-one

step

switch.

amplifier,

its

V2, a 12AU7,

cathodes

pattern

third

balanced

output

cathodesofthis

linearity.

this

resistance

coupled sweep

the

from

generatortotrigger

sweep

slopeofthe

the

synchroni~ing

the

opposite

synchronization.

AL

CHANNEL

consistsofthree

switch,the

proper.·

the

signals

first

balanced

are

fedinthrough

ranges of the

The

second

which

(VERTICAL

differential

stage.

stage

provides

The

adjusts

synchro-

the

platesofthis

generator

signal,

provision

signal

halfofthe

Input

Attenuator'

are

fed

amplifier

range

main

bal-

has

controls

ampli-

The

re-

variable

the

fre-

the

syn-

triggers

can

tube

parts

directly

• In

the

a .

lp.fd

be

capacitor.

B. INPUT ATTENUATOR

The Input Attenuator

switch in decade attenuator

steps,•1,

is

frequency

c. HORIZONTAL

The horizontal neutralized cascade.

balanced

When

the

consists

1,10VOLTS/CM. The

compensated.

AMPLIFIER

amplifier

differential

SWEEP

of a

three-position

consists

of two

amplifiers

TIME HORIZ.

cross-

in

SENSe

switch horizontal the

cathodes switchedtoa VERNIER control either The

Xl calibrate leg

has

the

magnified amplifier nected quency fier

VI02,

plates

rear

of

a

3.5

TheSweep

start

a switch, a sawtooth follower.

A.

T~IC;GER

The

ceive

the

fast,

a

the

start-stop and

the

trigger

A

Schmitt

B having a dc

A

to

amplifier B anddecathode-to-cathode coupling.

the

In pentacle Trigger

circ.uit

,

B-side

to

Due

o?e

statetothe

rIse

and

eitherofwhich

quent

If

the

grid

voltageisdriven lower

limit

the

cuit

will driven time

the

state.

takes

·place suchasin the suchasin

appliedtothe

of

the

is.

moved

sensitivity

control

from

theXlor

leg

the

X5

(gridsofthe

with a

response.

through

the

SWEEP GENERATOR

Generator

...

stop

from

the

ranges

of

input

amplifier

leg

having

the

in series···with

the SWEEP EXPAND switch which

X5

SWEEP

has

the

Xl

sweep

unmagnified (Xl)

sweep

(X5)

gain

sweep.

output

variable

connect

the

capacitortoadjust

The

platesofthe

to

the

direct

instrument.

consists

trigger,agate

integrato-randahold-off

.GENl!:RA'rOR

purposeofthe

synchronization

constant

amplitude,

trigger.

start-stop

trigger

signal

Since

trigger

circuitsadiscussion

trigger

c.onsistsoftwo

plate-to-grid

caseofthe

and

Generator

has

two

cut

off;

regenerative

Model

amplifier

and

stable

B-side

120A

Bisthe

the

Start-Stop

states:

conducting;

action

otherisvery

decay

times

from

canbeused

circuits.

A-Side,

above

The

the

circuit

will switch state rapidly. The

stayinthis

the

circuit

will

levels

input

side,isconducting and

than

state

upper

hysteresis

switch

at

which

canbeadjustedtobe

Trigger

the

Start-stop

input

Generator,

Trigger.

grid

will

circuit.

sweep

the

horizontal

ranges

resistance

V10l,

a sensitivity

the

horizontal

to

between

6DJ8,

gain

the

has

EXPAND gain

gain

sweep

controls.

adjustment

while

the

X5

adjustmenttocalibrate

The

platesofthe

amplifier)

are

the

input

con-

fre-

outputampli-

horizontal

connection

of a

trigger

deflection

linksonthe

gen,erator

inverter,.anintegrato;

cathode

generatoristo

and

pulse

for

the·trigger

are

forms

of

them

amplifiers

coupling

amplifierAis

triodeinboth

A-side

the

change-over

rapid,

each

sideofthe

for

triggering

convertitinto

operation

of

follows:

from

Trigger.

conducting, '

A-side

producing

re-

generator

Schmitt

A and

amplifier

the the

The

cut

off.

from

fast

circuit

sUbse~

the

the lower

hysteresis

cir-

until

the

input

grid

back

this

limit.

to

switching

close

or

Widely spaced:

its

together

At

this

original

action

Thedcvoltage

determine

the

state

is

to

of

is

Sect.InPage

4

To

trigger cross change the

conducting,whichisthe 120A, driVing

upper driving the hysteresis

B-side

and The initial

outside the

input

In the

adjusted

placed midway between the hysteresis Narrow ator action

B.

gered

signal.

the circuit, the A-side grid'voltage must

the

particular

state

the

hysteresis

grid

limit

hysteresis

of the

circuit.IfA-sideisalready

normal

grid

voltage positive through

limit

will

limit

case

have

voltage negative through

will put

A-side

out of conduction,

into conduction.

A-side

hysteresis

voltage

Trigger

with the TRIGGER

limits

will be

with a

grid

level

Generator

limits

are

sensitive

small

bias can be placed inside

area,

thus

establishing

requiredtochange

the

A-side

LEVEL

narrow

in

the

AUTOMATIC

usedsothat

and

start

input

signal.

upper and

the

Trigger

the

TRIGGER GENERATOR

The

Trigger

on

the

In

Generatorisdesigned to be

negative

the

AUTOMATIC

slopeofthe

position.the

which will

in

the

Model

its

no effect, but

its

lower

or

the

AI

s

state.

grid

bias

is

'control and

is

lower

position.

Gener-

synchronizing

trig-

synchronizing

bias

on

the input pentode stageisadjustedsothat the pentode

is

conducting when waiting fora·synchronizing signal

and

the

triode

bias

pointisautomatically

point

where

most waveforms.' A negative

start

to

the actionofthe sawtooth the pentode section of the Schmitt off and the produced. circuitofthe tooth

generator

input

signal

limit

will

LEVEL

controlisturnedtoits

clockwise associated vert

the

multivibrator

apprOXimately

in

effect

of a

signal cathode-ray tube. As soon is

received

sectioniscut

the Trigg.er

triodeisturned This

pulseisdifferentiated in the output

Schmitt

Which

start

position

trigger

to

start

crosses

the

sweep.

(AUTO. position)

with the TRIGGER

Trigger

generates

and

.Generator which 100

operates

cps.

its

presentsatraceonthe

the applied

off. In addition, the

adjusted

Generator

trigger

to an optimum

will

pulseisneeded

generator.

triggeristurned

on, a negative pulse

and fed into

the

generator.

the

lower

When the TRIGGER

extreme

LEVEL

into a

free-running

atafrequency

Thus

the

TriggerGenerator

own

triggerinthe

asa'

synchronizing signal

signal

takes

control

trigger

When

the

saw-

Thus,

hysteresis

counter-

the

switches

control con-

absence

face

of the of the

on

is

an

of

synchronization. In the va-riable TRIGGER

thefeed~ck

the bias level

clockwise from the

feedback

for

self-triggeringisdisconnected and

is

adjustable. As this controlisturned

AUTOMATIC

is

disconnected and then the bias level. As the biasismade positiveitwill trigger

the

requireamore

Trigger

LEVEL

Generator.

control

position,

the

control

more

and

negative

A

signal

differentiating

position

first

the

varies

more

to

circuit final tube (triode) of the vert

c.

start-stop butithas

hysteresis

sawtooth

and thus

fed the

limit.

changes conduct.

resistance-capacitance network of the voltageisnot permittedtoreach thelower limit, Off Cathode hold-off voltageisdeveloped

it

has

been

placedinthe

the output into a

START-STOP This

sharp

Trigger.

rather

limits

can

be fed

terminate

sharp

TRIGGER

output

Thisisanother Schmitt

wide

are

backtothe

itself.

backviathe·hold-off

start-stop

When

state,

Then

tri.gger

this

point

causing

the

voltage

Trigger

spikeisthen

hysteresis neededsothat

past

the

plate

circuit

Generatortocon-

spike.

fed into the

limits.

the

start-stop

The

integrator

cathode followertodrive

the

upper

is

reached

the

Integrator

discharges

through the

circuit.

however. A voltageisapplied .by the Hold-

will

be explained

Followertoprevent

later.

later

this. on in

the

of the

trigger

The wide

generated

trigger

Qutput

hysteresis

Trigger

Switch

This

hysteresis

Sincethis

circuit,

to

D. INTEGRATOR SWITCH

The

Integrator

square-wave output

Integrator which

is

awaitingatrigger,

ducting, thus

Switch

is

connectedasa diode. While the

shorting

Switch

of

the Start-Stop

consists

is

controlled

of two

the diodeisnormally

out the Sawtooth

Trigger.

triodes,

Integrator.

by

the

The

one of

circuit

con-

When a negative synchroniZing signalisreceived, the

Trigger

pulse

operating

turn,

puts out a pulse. The negative pulse applied

to

the plate of the diode

Generator

the

Trigger

convertsitinto a negative

Generator

causesitto

cut-off

which, in

permitting the Sawtooth Integrator to commence operation. The

triode

to

hold definite voltage (approximately sawtooth

E.

SAWTOOTH INTEGRATOR The

and

a generates waveform which

of

the

at

which

the

valuesofRandCin pentode. of

the Switch opens, the voltage applied to the capacitance

pacitor

capacitorisconnected between ofanamplifier. As the voltage

section

the

outputofthe

will

Sawtooth

pentode,

of the

always

Integrator

Miller-type

essentiallyalinear,

sweeps

cathode-ray

this

These

tubeata

sweep

values

SWEEP TIME

combination

through

th·e

Integrator Sawtooth

start

from

the

takes'

placeisdetermined

the

are

switch.

tries

resistance.

SwitcL

Integratorata

50

volts) the

consists

Sf'

same

of a

that

integrator,

positive,

trace

across

linearra~e.

grid

circuit

varied

for

When the

the

The

each

Integrator

resistance-

to

charge

the

However,

the

grid

and

across

t.he

capacitor

serves

the

point.

triode,

which

rising,

face

rate

of

the

range

ca-

the

plate

by

startstochange, the change, amplifiedbythe tube

is

and

the

output

grid

thus

Since

thereisa

sistance,

flowing into the

rentisconstant,

and

charging

crease The

across

rising

gratorisfed

sectionofthe coupled

thz-ough Follower are

usedtodrop

levels

whUeatthe coupled bulbs

are

high-frequency

is

also

usedinseriestopreve.nt

the

neons

F.

HOLD-OFF

The Integrator the

Start-Stop

by the.

of signal

resistance

the

Sawtooth

has

voltage will be

rapidlybythe prevent until the capacitor capacitor off cathode-foUoweraccomplishes only a stop

slow

trigger hysteresis stability trigger teresis erator

The

generator

limittotrigger

thus

sweep the Hold-Off Cathode suppliedtothe thatitwill teresis

limit. cathode adjusts

is

the

adjustedtoplace

hysteresis

polarity

keeping

the

reversed,

voltage

constant

a

constant

charging

capacitor.

and

the

circuit

output

through

6U8.

are

the

capacitorislinear.

waveform

two neon

The

another bulb to

whichisused

the

voltage

same

path

for

the

signal.

shunted·with a

response

oscillating.

CATHODE FQL:t,OWER

rate

at.which

reaches

t.he

Trigger

and capacitance in the

Integrator.

triggered-the

returnedtoits

Integrator

triggers

integrator

and

from

has

recover

.initiating

time to

combinationinthe

decayonthe

to a voltage level

limit.

This

controlsothat

will

reach

initiating a sweep.

length

adjustmentinthe

Follower

circuit

take

the

The

circuitofthe

and

sweeptoreach

sweep

Hold-Off

biasonthe

the

voltage

limits.

is

appliedtothe

relatively

voltage

across

current

Since

the

charging

valuesoft.he

constant,

of

signal

for

isolation.

time

the

voltage

the

Sawtooth

bulbs

to the

is

then

the

Hold-Off Cathode

Neon bulbs

down

to

the

furnishingadirect-

In

general,

capacitortoimprove

of the

circuit.Aresistance

the

possibility

the

rising

upper

output

hysteresis

wi-llbedetermined

grid

However,

start-Stop

Switch.

origlnal

Itisdesired

Trigger,

value

another

discharge

fully .

The

resistance-

cathodeofthe

this

by

grid

voltageofthe

2volts

above the lower

levelissetbythe

negative

the

triggers

below

start-stop

the

lower

triggergen-

grid

adjusts

thus

the

stability

the

lengthoftime

its

upper

control,inthe

Cathode

Start-Stop'

just

Trigger. above the

G. GATE OUT CATHODE FOLLOWER

Another

to

furnishapulsetounblank

The

Gate

function of

Out

Cathode

the

Start-Stop

the

Follower,

Trigger

cathode-ray

V203A,

constant.

the

re-

must

be

cur-

capacitor

in-

Inte-

triode

cathode-

pr.oper

the

neon

the

of

Sawtooth

limit

of mainly circuit

after

this this

fairly

to

sawtooth

the.timing

hold-

permitting

start-

sweep

from

the

hys-

circuit

of

voltage

hys-

Follower

This

lower

is

tube.

couples

the

required Trigger the

sweep.

3-6

The

LOW

Low

separate

regulated

filament

A.

PLATE

VOLTAGE

The

Low Voltage voltage +100 volts and

The

positive of a

transformer,

section)

regulated

usual

by

a 6U8

supply lOW-impedance cathode

The

negative. former, voltage in

the

usual

This

supply supplyisused negative

B.

TRANSISTORIZED

This

useasa filament supply

in

tubes

positive

to the

VOLTAGE

Voltage

supplies

de

supplies.

VOLTAGE

supplies,

plate

amplifier,

(triode

has

a +380

follower.

voltage

a 6X4

reference

regulated

hasasingle

return

supply

series.

gridofthe

Power

furnishing

filament

POWER

Power

one

the

other

supply

a

5Y3

and a

pulse

from

CRT

for

POWER

Supply

plate

supply,

SUPPLIES

and

SUPPLY

Supply

contains

furnishing

furnishing -150

v'oltage

rectifier,

12B4Acontroi

power supply configuration followed

section)

volts

supply

cathode regulated from

supply

the

consists

rectifier,a6AV6amplifier,

tube

and

a 12B4A

power

supply

outputat-150volts.

for

reference

for

the

furnishes

These

tubes

for

andinadditionasa

circuits.

F~AMENT

regulated

two twelve-volt filament

are

the in theVerticalAmplifier. Any change voltage of appearasdrift By s,upplying sour'ce supplyisgreatly·

The supply two connected much the same/asthe vacuum Q302,

the

pnp

transistors.

-tube

compares

these

tubes

will be

on the face of

this

filament voltage" from a

possibilityofdrift

reduced.

consists

of a

silicon

A

power

as'agrounded

series

regulator.

the regulated

greatly the

duetothe

power

emitter

tube

The

control

filament

cathode-ray

transistor,

the -150 volt regulated supply and bias

for

supply

the power

at

+24

transistortomaintainthe filament

volts.

Sect. III

the the

SUPPLIES

consists

Page

Start-Stop

duration

of two

voltages,

the

usual

IN

THE

two

+380

volts

volts.

supply

consists

a 6U8 (pentode

tubeinthe

follower.

and

a +100

cathode

configuration.

SUPPLY +24

first

in

amplified

amplifier,

ina

provides

of

of a

trans-

a 5651

control

volts

two tubes

the filament

regulated

filament

rectifier

conventional

transistor,

voltage with

suitable

5

of

a

ac

LOW

plate

and

ThiS

volt

the

tube

This

for

and

tube.

and

Q301,

acts

Sect.m Page 6

3-7

HIGH

VOLTAGE POWER SUPPLY

The High Voltage Power Supply consists of a Hartley oscillator, two and two

The lator

tube

Hartley

tube, and a tapped winding on the transformer supply. 60 kc. and two supplies and

This

separate

is

Intensity the ground age on the

The the

the

patte

rn.

other

Cathode-Ray Tube. Itisalso

regulator

this

string coupled output of of the, oppose

regulator

this

Hartley

any

separate

regulators.

oscillator

whichisseries

This

circuit

supply

5642

connectedtothe

Limit returnofthis intensity

secondaryisconnectedtothe cathode

resistor

and

fed into the input of a two

regulatoristhen fed back tothe

oscillator

changeinthe

secondary winding supplies

consists

of a 6AQ5

hig.h

fed

from

the

oscillatesatapproximately

has

two

separate

rectifier

tubes. Oneofthese

grid.

p'otentiometers in

secondaries

The INTENSITY

series

supply determine the

grid

and

thus

the

brilliance

connected to the

string.

(both

Voltageistaken

sections

of a 12AU7). The

in

the

proper

dc output of

the

oscil-

voltage

+380

volt-

from

tube

screen

phase

cathode

volt

with

of

dc-

to supply The

Intensity

coupledtothe

negative

A whileapositive

Modulation

terminals

cathodeofthe

voltage

input

will

voltageofapproximately

are

Cathode-Ray

brighten

the

also

Tube.

trace

twenty

ac

volts will blank the Cathode-Ray Tube from normal

intensity.

3-8

The to put out a square wave with

CALIBRATOR

Calibrator

consistsoftwo neon bulbs connected

an

amplitude of60mil-

livolts. When the VERTICAL SENSITIVITY control

is

switched

Into

the

CALIBRATOR

position

this

signalisappliedtothe The

patternonthe

vertical

faceofthe

amplifier

Cathode-Ray should then be adjusted to give a height of meter

loscope

sensitivities Operation of the

encetothe

(VERNIER in CALIBRATED).

will

thenbecalibrated

engravedonthe

within ±5%to the

front

calibratorisexplained, with

schematicofthe

Calibrator

panel.

Voltage and Filament Supply schematic), When

the

sWitch, 82, sidesofthe thereisno

When

the voltageatthe +380

volts

will

fire

more

rapidly becauseitis

supply.

neons

action.

switchisturnedtothe

top of

sincenocurrent

firstasthe voltage

When

1301 R358. However, the voltage up

slowly because time. across neons will 70 fire charges 70 1301

When

R358torise,

volts

and

stay

volts

will

this

also

rise.

(approximately)

lit

until the voltage through below

now

the

fire

1302isthus'alternately of

about taken The canbeset in

amplitude. is

fed into pattern

400

cps.

from

the

current

outputisapproximatelyasquare

Wit~1

R365tobe of exactly60millivolts When

the

vertical

six

centimeters

are

isinthe

at

the

off

same

position

potential,

on position, the

the

neons will

is

being

try

drawn.

acrossitwill

returnedtothe neg.ative

firesitwill draw

across

C334

must be chargedatthe

capacitor

allows the voltage

the

voltageatt.he

When

abQve

current

R358 will build

this

voltage

ground,I302

across

R358toa voltage apprOXimately

voltageatthe

and the action will

turned

The

output of

passing

the

output of

amplifier

top

of the neans.

repeat

off and onata

the

calibrator

through

this

it

will show a

in height when the

fieriscalibrated.

input.

Tube

six

centi-

The

oscil-

refer-

(on the Low

as

follows:

both

so

to

go

to

1301

increase

through

same

drop

top

of the

rises

to

will

C334

dis-

itself.

rate

is

this

neon.

wave which

calibrator

ampli-

Sect.

IV

Page

1

4-1

INTRODUCTION

This

section contains instructions servicing possible standard,

have

obtained

be Company. When

to specify and

Replaceable

In

general, sectionsinthe Model 120A will be found behind The power

tubes

this

each instructions. follows:

4-2 Removing the Cabinet 4-3 Connecting 4-4 Tube Replacement 4-5 Isolating 4-6 Condensed 4-7 4-8 4-9 4-10 4-11 4-12 Horizontal Amplifier 4-13 Sweep

the Model 120A Oscilloscope. Whenever

readily

been

used.

model

description

the

front supplies

are

marked

section:is.divided accordingtocircuit

section

Adjustment Turn

Power Trigger Vertical

Other

directly

ordering

and

of componentasgiven in

Parts

together

panel

areinthe

on the

haVing a

The

materialinthis

for

TroublestoMajor

Test

Procedure

On

Supplies

Generator

Amplifier

Generator

obtainable, components

Special

from

directly

serial

controls

chassis.

complete

230-VoltPower

and Adjustment

for

adjusting and

components

the

Hewlett-Packard

from

(€j)

numberofinstrument

Table

with the

stock

number.

for

that

section.

rear.

Controls

The

material

functions,

setofadjustment

section

Lines

Sections

Procedure

be

may

sure

is

of

and

in

as

SECTION

MAINTENANCE

4-3

The

the

connected in The for the power supply input to terminals

connecting the windings in

jumpers the

windings in

4-4

Tubes for function

Check

proven to be weak

the

misleading.

being

The

out of

replacement

When

paragraph

CONNECTING

POWER

120Aisnormally shipped from the factory with

dual

primary

Windings can

use· on 230-volt power,ifdesired.

the power

and connectaninsulated

s'ecand and

TUBE

with

replacement. In a

canbetracedtoa defectiveorweak tube.

tubes

use

of a

returnedtothe

heatersofV1

either

replacing

LINES

of the power

parallel

transformer.

on

each

fourth

series.

REPLACEMENT

standard

by substitution and

"tube

Mark

one wUl

chart

the CRT,

4-8.

FOR

230-VOLT

transformer

for

use

on 115-volt ac

easily

or

andV2areinseries

be

reconnectedinseries

terminal

Notice that the two

side

are

parallel.

terminals,

EIA

characteristics

great

defective. Results obtained by

checker"

original

same

turn

Table

4-1.

see

strip

located

jUJ.npered

Remove

jumper

connecting

can be used

numberofcases,

replace

canbeerroneous tubestoinsure

socketifnot

and a

off

the

other.

steps2,3, and 4 of

IV

windings

lines.

First

find

together,

these

between

the

mal

only those

and

their

replaced.

burn-

See tube

...

4-2

Disconnect power cord and remove on screws.

When the are especially when working around the CRT and power supplies. _

REMOVING

rear

of cabinet.

Slide oscilloscope

exposed.

THE CABINET

Do

not

remove

forward

CAUTION

cabinetisremoved,

Take

adequate

two

large

any

out of cabinet.

dangerous

safety

precautions,

screws

front

panel

voltages

terminals

TABLE

Circuit

Ref. Q301 Q302

V1 V2

4-1.

TubeorTransistor

Type and Function Adjustments

2N301 2N383 12AU7 12AU7

TUBE REPLACEMENT CHART

Regulator Amplifier output Vert. InputAmp. Check

Vert.

Amp.

AND

TRANSISTOR

Tests

Check

power supply

Balance and Gain

and/or

+24

Vertical

volt

Sect.IVPage

2

Circuil

TABLE

TubeorTransistor

4-1.

CONT'D.

Tests

and/or

Ref. Type and Function Adjustments

V3

V10l VI02 12AT7

V201 6AN8

V202

12AT7.Vert.Output

Amp.

6DJ8/ECC88

Horiz.

Amp.

Horiz.Out-

put

Amp.

Trigger

Generator

eus

Start~Stop

Trigger

Check

Vertical

Balance&Square

Wave

Response

Entire test X5

and

Horiz.

procedure,

sweepcalibratian

compensation.

Check

Trigger

sensitivity

Check Sweep

bility

Control

adjustment

V203 12AU7

Gate-Out

&

Hold-Off Cathode Follower

V204 12AU7

Integrator

None

Switch'

V205 6U8SawtoothGen-

erator

va01 V302 V303 5642 V304

12AU7 6AQ5

Amplifier

Oscillator

H.V.Rectifier

5642H.V.Rectifier

Check

H.V.Power

Supply Output

Gain,

Amp.

Xl

Sta-

4-5

IF FACE, SET ALL CONTROLS EXACTLY

IN

&

IF

that

the fuse·

Set to

by

their

AFTER visual

justment been

ISOLATING

SECTIONS

NO

TRACE CAN

TROUBlES TO

NOTE

BE

OBTAINED

MAJOR

ON

THE CRT

AS

FIGURE

THE

powerisbeing

the power

2-1.

INSTRUMENT

cordismaking good contact. Check

by

substitution. If

wn..L

applied

NOT

to

the

stm

inoperative,

OPERATE, check

instrument

cabinet and check continuity throughacpower

IF

INSTRUMENT TURNS

FORM is

SOME

not

maladjustment

the

TRIGGER

localiZe

the

checking the

FUNCTION,

troubletoa

controls

LEVEL

ON·

BUT

wn..L

be

sure

that

of

the

front

panel controltoAUTO. particular

and how well they

NOT

main

functions.

DETERMINING INOPERATIVE SECTION,

and

repair

electrical

thatisnecessary.'

until

the

inspection

cause

Avoid

of

will

making

the

malfunction

pinpoint

corrected.

SHOWN

and

remove circuit.

PER-

the

cause

controls.

Try

section

perform

the

any

ad-

has

V305

5AQ

Pi,

2,

11 CRT

V306 5AR4/GZ34

tifier

V307 12B4A

V308 6U8

V309 6X4 V310 12B4A

V311

6AU6

V312 5651

Regulator

Amplifier

Rectifier

Regulator

Amplifier

Reference

7,

Rec-

or

See

adjustments

under

"TURN

~~

&

also

check

&

Horiz.

Gain

None

power

+380

supply

Check

output

Check

volt output

power

+380 & +100

voltages None Check -150 volt

power

supply

output

ON"

Vert.

volt

supply

Check

tubesasdescribedinparagntph

tubestotheir

The

two

sidesofthe

are

normally

center

usually

of

unbalance

move off the together sidesofone types, to of a

screen

dc unbalance,

the

shorted

stage

and

balancedtoposition

the

CRT.

screen.

the

control

stage.

together

hold

circuitisfaulty. the

amplifier

isolating grid,

and

preceding

the

faulttoa

cathode

stage

until

condition.

original.sockets

differential

A

fault

the

grids

points.

does

the

spot

Continue

the

circuit

To

This

jitter,

and

bring

(or

eliminates

etc.

If

shorting

not

bring

motionless,asubsequent

this

spot

does

particular

circuits

for

the

of

cause

4-4.

Return

unless

amplifier

in

either

cause

the

plates)

spot

the

spotinthe

the

back,

replaced.

circuits

side

spot

of

the

signalsofall

originating

the

two

the

spot

process

through

appear.

stage, check plate,

the

of

stage

the

and

unbalanced

will

to

short

two

prior

halves

on the

After

the

---_

...

__

...

----..:---_._

•..

--.----....._--_.--""'--_._.

__

-..

,._-~-_._-_

.....

_----''''--.

-_.

,--------~_._.

;..;..-_

--',---_

_,,--_

..

_--.

__

._-_.--

..

_--._-

Sect.

..

_-_

IV

..

_---_

..

,

_----

Page

3

4-6

All

!he basic

CONDENSED

PROCEDURE

lests

and

TEST'

AND

adjustments

ADJUSTMENT

are

covereu in

the

following

instruments

ment

is

not

Isolating

Table4..2.This

that

arc

opcrating~

Troubles

to

functioning.

refer

Major

to

Sections.

procedure

If the

paragraph

is

instru-

4-5,

for

. I

TABLE

4-2.

MODEL 120A

CONDENSED

TEST

AND ADJUST),fENT

PROCEDURE

1.

Test

Low

Voltage

External

DC

Equipment

Required

vtvm

witb

accuracy

Power

Supply

2.

Vertical

Ampli!ier Balance

3.

VerUca.l

AmplUier

Gain

4.

Calibrator

5. HoriZontal None

Balance

8.

HoriZontal

AmplUier

GaiA

'1.

Horizontal

Ampli;11er

SweepGain

8~"

HoriZontal Oscilloscope with

AmplU1er low capcity

.

Compen-

satlon

t.Trigger'-

Sensitivity

10.

SWeep"""

StabUity

11.Sweep

Length

NOlIe

400

cycle

Calibration erator

Nol'le

400 cycle Voltage

Calibration

erator

Time

Marker

erato~

1)

Oscilloscope

10:1 probe

2) 50 cps to 250

oscillator

3) AC VTVM

"DCVTVlff-

250

kc sine wave

Oscillator

1%

voltage

Gen-

Gea-

(;en-

probe

Measure

supply outputs,snouldbe with-

1A

the

-150~4 volts

+100

+380:*10

+

24

VERT.SENS.to

NIER

full ccw

Rotate VERNIEa

VERT.S£NS.to

NIER to

COIlQ8Ct

bratioa

iIlput

VERT

.SENS.

NIERtoCAL.

HOR.SENS. to 10 v/em,

NIER

to CAL.,

toOF!'

Tum

VERNIER

HOR.SENSto.1

NIER to

to

on

Cona.ect

bration zontal input.

SWEEP

Change

SWEEP

Tn~fE

EXPANJ) X1.Apply'5 rns pattern.

markerstoyerUcal

time

SWEEP

TIME

SWEEP EXP

Connect

zontal deilection plate nal

pia

Adjust

sweep

screen.

SWEEP

with

S'YNCtoEXT.,

kc

DC

Disconnect Connect

SWEEP TIl\1E SWitch to200

EXPANDtoX5.

..

eeps~tocenterofsereen.

to

AUTO.

couple a 250

.7

volta

input. Couple· scope to body

.

R2p.1

(a 3.6K, 1!2W

6ofV201).

to

pinSofV203, VERT.SENS.

to

OFF,

SYNC.lNT., TRIGGER

full

CC:W

second/em.

sine

wavetovertical

Procedure

all

low voltage

following

:t

3

volts volts

~'1

volt

10mv/cm,

CAL.

100

my

limits:

lOmv/cm,

fuUcw

p-pfrom

power

VER-

Call-

Do

Adjust

Pos1tionspotincenterofscreen

with

Center

Adjust

10cmdeflectiOl1

Adjust

not'adjustifwithin

R344

VERT.

spot

VERT.

Generatortovertical

switch

CAL.,

1.ovolt

and

VER-

VERT

.SENS-

fullccw

v/cm" VER-

VERT.SENS.

p-p

fromCall-

AdjustCALIBBATOR

for

a.o

em

spot

CeRte:r

Center

spot

BALANCE (R1IO)

set

HORtZ.GAIN

deflectiQI1

Generatortohori-

5

MS/eM,

markers

EXPAND~oX5.,

10f.Lsec/em., AdjL\St

Ab.'D

probe

to

either

to

input.

to 1

Xl

hori-

SWEEP

lUS.

Adjust

"trigger

Adjust

R107

dence

with

Adjust BI08

dence,with

el05

~ybaC:k

termi-

1

01'6

of

VIDa

starttocenter

THIGGER

kcsine

rmsintothe

of

Adjust Adjust

LEVEL

Set.

waveo!

EXT.SYNC

ClOGtocompensate

fiyback

trigger

(R247)

just

poiRtwhere are

obtained.

QI

all

VTVM(..

s\VEEP

but

not

ext.

100 volt

resistor

inputs.

TThfE

in

AUTO.

scale)

0.5

ms,

LEVEL

micro-

on

Slowly

(R

several

just

Set

R228

Adjust

adjust

228) until

times

prior

for2volts

signal

Connect 250 kc SENS. to produce.;4to10

input. deflection.

for

-150

POSe

with

VERT.DC

GAIN

(B18)

deflection

with

HOR.

With HORIZ.

(R114)

level

for

marker

1

em

graticule

for

marker

leU!

g~ticule

toeomrensate

sensitivity

clockwise of

stable

triggers

SWEEP

sweep

begins.

and note voltage

to'

aweepstart.

more

voltage

or

limits.

volts.

BAL.

fat'

SiT

(R358)

POSe

for1Qem

stable

coinci-

maries

coinci-

marks

control

the

sTABILn'Y

Repeat

positive.

VERT.

em

Notes

, Check sweep

bratiooif-150V

is

adjusted.

Repeat

eali-

as

required

Repeatasrequired

for

cps

stable

from

to

250kcs

Cheek

triggers

50

withO.5volt

rms

. . )

Adjust

for

SWEEP

10.5

LENGTH control

cm

trace

length•

4-7

Usuallyaparticular complete

tests

completing

The

ADJUSTMENT PROCEDURE

oscilloscope

testing

will

be needed and they·

following

and

the

entire

procedures

calibration.

test

procedure.

are mended sequence for a complete operation.

of trouble and new ones·should be

ing

adjustments

In

general,

·or

other

tubes

component

will

Only oneortwo

can

be done without

listedina

test

and calibration

are

the

main

tried

before

replacements.

not need

recom-

cause

mak-

and

sharply

high

voltage

operating

If

necessary,

the

FOCUS Control to

-2250

3)1£

R308

focused

power

properly.

the high voltage

control

R308

terminal

canbeadjusted

volts.

settingischanged, ASTIGMATISM (R316) obtainasmall,

round, and

-spot with good supply

canbeassumed

canbemeasured

with the orange

to

adjust

controlsatlow

sharply

Sect.

IV

brilliance,

set

this

FOCUS and intensity

focused

Page

the

to be

at

wire.

voltage

to

spot.

5

Specifications

are

giveninthe front of

test

procedure

the

particular

data

they contain

analyze a and

specifications.

A fifteen minute voltage

before

4-8

1)

ground with

be

measurements

making

TURN

Measure

.within

+380

+100

ON

resistance

an

25%

of

volt supply

-150

+

24

Measure horizontal placeAC-DC with

resistances

an

<€PJ

input

switches inDCposition. As

Model 410B

should read:

for

the

<€PJ

Model 120A

this

contains

extra

instrument. These

can

warm-up

and

are

any

other

test

from

<€PJ"ModeI410B

the

follOWing:

Voltmeter. They should

50Kohms 50K

12K o.hms

5.5K

to ground into the

terminals

for

Voltmeter

Oscilloscope

manual. The following

checkstohelp

not be

always

considered

power

recommended

or

adjustment.

supply output

the power

extra

supplies

you

checks

as

to

ohms

(remove

all

12AU7)

switch

vertical

positions,

and

measured

these

resistances

4)

If

the cathode-ray tube physical position changed, c.heck TRIGGER to

AUTO. SECONDS/CM. with

the

graticule.

sitioned

face and

4-9

just

filter

POWER

trace

LEVEL

Set

SWEEP TIME

The

behind the

touc.h, Newton

SUPP,LIES

alignment

control

CRT

The

filter

fully

trace

CRT

with

counterclockwise

switch

should be

face

in the

rings

will

The power suppliesinthe oscilloscope

stable

output voltages·should

vals

and will

require

infrequent adjustment. The

be

measqred

at.

but unnecess'lry adjustments shouldbe·avoided.

has

been

bezel.

Turn

to50MICRO-

parallel

shouldbepo-

be~el.

If

CRT

occur.

are

extremely

regular

inter-

CAUTION

When

first

supply

turninganoscilloscopeonafter

repairs,

turn

the

intensity

and

either

power

positioning control full counterclockwise before applying power.

Failure

permanent

1)

Turn

for

warm-up.

instrument on and allowatleast15minutes

to follow

cathode-ray

this

precaution can

tube damage.

cause

VERT. SENSITIVITY

OFF

CAL.

= 1 megohm

=

SWEEP TIME HOR.SENS. = 1 megohm

turning

When after

repairinany

intensity

clockwise before applying power.

this

precaution

tube

damage.

2)

Turn

measure

supplies.

the osciUoscope on

power

and one positioning

may

cause

instrument

the

output

If

you

on

(see

voltageofthe

are

abletogetasmall,

for

supply

circuit,

control

Failuretofollow

permanent

precaution

00

the

first

full

cathode-ray

above) and

internal

time

turn

the

counter-

power

round,

2)

Turn

sweep

TIME - HOR.

3)

Measure vo.ltage various wire

set

voltages

color.code will normally be within the Control the"

If

adjustment of the -150 volt supply was

you will

-150

R344

volt

also

Calibrator

generator

SENSe

power supply output

to

115

volts.

appear

given in

offbyturning the SWEEP

switch

to

10 VOLTS/CM.

voltages

The·pointsatwhich

can

be

Table

limits

4-3.

given inTable

canbeadjustedifnecessary

supply

havetocheck

within

limits.

all

Sweep

adjustments.

with

line

the

identifiedbythe

The

voltages

4-3.

to

set

necessary,

Generator

and

Sect.IVPage

6

TABLE

4-3.

REGULATED POWER SUPPLY TOLERANCES

Color

Code

Purple

Red

White** setto115

regulationofeach

power

line

vertical

voltage

Normal Ripple*

3mv

40mv

4·mv Yellow

40mv

Yoltage

as

Nominal

Voltage

-150

+380

+100

24

+

* With

**

In

4)

You may wish.tocheck

supply

amplifier.

the

between 103to127 Yolts. All should

remain

within

±

1%

over

Voltage

Tolerance*

4

volts

± ±10

volts

3

volts

±

1

volt

±

volts.

power

voltageisvaried'

regulated

this

voltages

rangeofline

voltage.

5)

Measure the ripple voltage on the various supplies, they should approximate the values given in Table with

the

line

voltage

6)

Measure

terminal

with

a

459A

CRT cathode voltage

with

VoltageMultiplier Probeisrecommended.

If necessary, control R308 can be adjusted

voltage

7)

to

Adjust

-2250

FOCUS

ASTIGMATISM

Set

pointer

adjust

spotisjust

on INTENSITY knob

Intensity

extinguished. usually required only·if the setting of the control

has

been changed.

the

orange

volts.

control

Limit

setto115

control

R316

control

volts.

wire.

for

best

fora

R322sothat

These

at

FOCUS

An

~410B

to

focus

small

round spot.

to9o'

clock

adjustments

high

control

VTVM

set

and

the CRT

voltage

4-3

this

set and are

Connect Sweep triggered, voltage

Now Slowly running,

voltage The amplitude of the

7

from

more proper

3)

Connect

SYNC

and

the

Sensitivity

tivity·

trigger

triggering

over

LEVELtoAUTO

~410B

Stability

then

reading

connect a -clip

rotate

·R228 ccw·untU the sweep

then

reading

difference

volts.

WhUe

1 V201toground)

positive

setting~or

External

Set

SYNC

TRIGGER

Trigger

controlsasfollows,

--------

LEVEL-

Horizontal

a 250

terminals.

oscilloscope

Trigger

Generatorasyou

control

until

stable

sensitivity

should be obtained

this

range.

(-100v range)topin 8

Control, back off

which

back

which

should

lead

from

off

untilitjust shouldbeabout

between

triggers'

the

triggers

than

the

stability

SensitiVity:

AC-DC - - -

kc

sine

wave

With a

observe

R247.

triggers

from50cpsto250

Disconnect

-"'"

the

free-run.

A

useable

indication

for be obtainedbyclipping the the

bodyofresistor

sistor

4)

for

TRIGGER

Set

controlsasfollows,

V201A.

LEVEL:

R204.

V2030Rotate

R228, ccw until

untilitjust

be

stops.

about

pin 1 V201toground.

stops.

these

and

last

two

must

be between 5

are

shorted

set

R228

reading.

readingsisthe

control.

- - - - EXT.

- - -

ofO.7v

.10:1·or

the

output

rms

bettera50:1probe

triggers

increase

Increase

are

with

Trigger

this

trigger

obtained.

less

than

input,

set

Generator

adjustment

oscilloscope

Thisisthe

sweep

Take

-72

voltso

starts

free-

Take

-78

volts.

and

(clip

lead

to

2.

0

volts

Thisisthe

AUTO

- -

into

from

the

Trigger

sensi-

Check

kc.

Stable

O.

7vrms

TRIGGER

should

can

also

probe

over

plate

is

a

a'

DC

the

re-

4-10

The

TRIGGER GENERATOR

Trigger

Generator

must

be working

in

order adjust the Vertical and Horizontal Amplifiers. Also, these amplifiers Generator Generator

1)

C'heck power supply

2}

Stability Adjustment: Set

controlsasfollows,

VERT. SENSrrIVlTY - - - - - - - - -

SWEEP SYNC - - - - - - INT

must be adjusted beforetheSawtooth

canbeadjusted.

To

c:heck

proceedasfollows:

accordingtoparagraph

TIME - -

O.

5 Mll.aLISECONDS

the

Trigger

4-9.

CAL.

TRIGGER LE;VEL - - - - - - - - AUTO

SYNC - - - - - - - - - - - - -

to

Adjust input GER LEVEL. starting of

this average to

EXT.

Range of TRIGGER this

signal.

5)

Internal

Set SYNC

SWEEP

Vertical

for8emofdeflection.

control

pointofsweep

control

shouldbeat

valueofthe

clockwise

moves

signal.

Adjust input signal

LEVEL

Trigger

Sensitivity:

controlsasfollows,

- - - - TIM:E

- - -

AC-DC

...

-

INT+

Rotate

and

upward.

least

+2

cmfrom

Switch SYNC

for20v

.control

------

50 MICROSECONDS/CM

---------

peak-to-peak.

should

see

The

TRIG-

that

range

switch

exceed

IN'T+

the the

DC

C223

C233

Sect.IVPage

7

C235

---

.........

_

C225

C226

Figure

With a 10kcsine fier,

decrease

gers

are

becoming

above).

O.

5

triggering

6)

Repeat TRIGGER

cm

when

Trigger

testsinthe

Vertical

from50cpsto250 kc'.

Level

LEVEL control (adjust

tivity). Check using same over

range

from

7)

Line

Synchronization:

Set

controlsas'follows,

SY'NC

TRIGGER

- - - - - - - - - -

4-1.

wave fed into

the inputtothe

unsteady

deflection

the

triggers

Sensitivity:

two

10 cpsto250

LEVEL

- - - -

Most

Internal

Row along

the

point

(observe

should

Calibration

sideofChassis.

Vertical

where

Ampli-

the

triggers

be

less

become unsteady. Check

paragraphs

for

maximum

specifications

kc.

sensi-

AUTO

trig-

as

than

using

LINE

Controls

(See

are

Locatedinan

also

Figure

4-11 VERTICAL AMPLIFIER

1)

Balance:

controlsasfollows,

Set

4-2.)

Easily-Reached

VERT. SENSITIVITY - - - - - 10 VOLTS/CM HOR.

Turn

VERT. clockwise POSe

control. position trol.

Repeat

SENSe

and

spottocenter

- - - - - - - - 10

SENSITIVITY VERNIER

position

Turn

this

spottocenter

VERNIER

with

sequence

VERT.

until mentofspotasVERNIERisrotated. POSe the

2)

screen.

Gain:

Set

controltothe

controlsasfollows,

center.

VOLTS/eM

full

with

clockwise

DC

thereisno

Spot

should now be on

counter-

VERT.

and

BAL.

Set

VERT.

re-

con-

move-

The

should

normal

60

giveastable

cycle

pickupinVertical

pattern.

Amplifier

VERT. VERT. SENSITIVITY VERNIER - - - - CAL

SENSITIVITY - - 10 MILLIVOLTS/CM

Sect.IVPage

8

100

With Calibration

controltogive

GAIN Check

3)

this

Calibrator: Set

controlsasfollows,

VERT.

millivolts

Generator

setting

SENSITIVITY -

peak-to-peak

set

Vertical

exactly

at

high

10

and

...

VERT. SENSITIVITY VERNIER.....

SWEEP

Check deflection of

the R356 symmetry

4)

Square Wave Response: Set

VERT. SENSITIVITY

TIME-...

...... 2 MILLISECONDS/eM

polaritybyvarying

calibrator

square

wave

fore.0cmofcalibrator

-_.

shouldbe40-60%orbetter.

controlsasfollows,

-...

10 MILLIVOLTS/CM VERT. SENSITIVITY VERNIER SYNC TRIGGER SWEEP TIME

-LEVEL

--

- -

...---

...

- - - 10 MICROSECONDS/CM

fromaVoltmeter

Amplifier

em

of

low

...

- -

VERT.

deflection.

line

voltage.

...

-

- - CAL

R356.

should

deflection.

- -

...

- - AUTO

move.

...

-...

-

The

Check

CAL

top

Set

CAL

INT

Apply 2 kc also·

Adjust

sine

measure

input

wavetovertical

this

input

signal

for·

exactly Note reading on 400D. Apply 200 kc adjust flection

4-12

1)

the inputtothe

on

screen

HORIZONTAL

Balance: Set

controls

HOR.

SENS.-

HOR.

SENSe

same

shouldbegreater

AMPLIFIER

as

follows,

• - - - -

VERNIER -

VERT. SENSITIVITY

Position control. clockwise

Balance TIVITY HORIZ.

movementofspot HORIZ. POSe

+

nOw

spottocenterofscreen

Turn

HOR.

SENSe

position

and

Adjustment,R110.

VERNIERtoCAL

POSe

control.

when VERNIERisrotated.

controltocenter.

be

on the

screen.

reposition

input

with

an

10

reading

with HORtZ.

VERNIER full

Turn

and

center

Repeat

until

terminals

r$j)

Model 400D.

cm

deflection.

sine

wave

on 400D.

than8cm.

10 VOLTS/CM

- -

--

counter-

with

Horizontal

HOB.

SENSI-

spot

there

The

spot

is

should

and

De-

CAL

OFF

POSe

with

no

Set

Apply nals.Adjust just sponse.

5)

50

lee

square. wavetovertical

C15

(see

generator

Figure

for8cm

4

...

2)

for

best

Ama.xi.mum of2%overshootispermitted.

Attenuator Set

controlsasfollows.,

VERT. SENSITIVITY...

Compensation:

...

100 MILLIVOLTS/CM VERT. SENSITIVITY VERNIER SYNC TRIGGER LEVEL - - SWEEP TIME

Apply Adjust attenuator

SENSITIVITY

inputtogive8cm

response.

check

and·

Now

switch

and check

6)

Frequency Set

-.........

5

kc

square

for8cm

forafiat

- -

...

- - 200 MICROSECONDS/CM

wavetovertical

deflection.

top

controlto1

deflection.

Switch

for

Vertical

flat

response.

blckthrough

for

10:1steps

•.All shouldbe10:

Response:

controlsasfollows,

... ...-.- - - -

... ...

Adjust

square

wave

VOLT/eM

Sensitivityto10VOLT/CM

.Shouldbewithin

the four

attenuator

VERT. SENSITIVlrY... - 10 VERT. SENSITIVITY VERNIER - - -

input

termideflection. square

...

...-..

input

C6 on

•.

Switch VERT.

and

Adjust

Ad-

wave

re-

CAL

mT

- AUTO

terminals.

vertical

increase

C2

for

flat

1%.

positions

1within

MILLIVOLTS/CM

...

- CAL

1%.

2)

Gain:

Set

controlsasfollows,

HOR. SENS... -

HOR.

SENSe

Apply bration

1.0vpeak-to-peak Generator

--

...

VERNIER -

to

the

Horizontal input

-

fromaVoltmeter

Set Horiz.Gain Adjustment, R114, of

deflection.

line

voltages.

3)

Square Wave Response:

controlsasfollows,

Set

HOR. SENSITivITY -

Check

this

settingathigh

..

O.

- - -

for

0.1

HOR. SENSITIVITY VERNIER - - - - - -

Connect

input wave for10cm

Horizontal

wave amplitude

C107

square

shoot

4)

8 kc (approximately)

terminals

generator.

deflection. Apply

input

for

minimum

wave

response.

ispermitted

Attenuator

controlsasfollows,

Set

Compensation:

and

sync-in

Adjust

terminals,

6 to 8

capacity.

o

sine

terminal

the

gain on

50

and

cm

Adjust

A

maximumof2%

HOR. SENSITIVITY - - HOR. SENSITIVITY VERNIER

wavetoVertical

kc square wave

adjust

deflection.

- 1

- --"- - CAL

1 VOLTS/CM

-..

CAL

Cali-

terminals.

exactly10cm

and

low

VOLTS/CM

CAL

of

square

the

oscillator

the

square

Adjust

Cl10

for

best

over-

VOLTS/eM

to

Connect 800 tical

input

wave

generator. for10em Horizontal wave

amplitude

C235 on

cps

(approximately)

terminals

deflection.

input

terminals

for

horizontal

and

Adjust

Apply 5 kc

6 to 8

attenuator

sync

the

and -

cm

-in

terminalofsquare

gain on the

deflection.

for

Set HOR. SENSoto10VOLTS/CM

for

flat

response.

three

attenuator

sion.

'Division should be within

Now

ranges

switch

and

check

sine

square

adjust

flat

and

back

for

5%.

wavetoVer-

oscillator

wave

the

square

Adjust

response.

adjust

through

10:1

C233

the

divi-

to

Sect. IV

Apply

10-millisecond

put

terminals.

for

best

R10S,

3)

Sweep Set SWEEP

pattern.

for1marker

Linearity

controlsasfollows,

TIME..-'

time

marker

Adjust TRIGGER

to

LEVEL

Adjust X5 Sweep Gain

per5centimeter.

Adjustments:

-

10

l\1ICROSE CONDS/CM

VERNIERtoCALIBRATE

SWEEP EXPAND - - - - - - - - - - - .- -

Page

Vertical

control

Adjustment

9

in-

Xl

5)

Phase Set

HOR. HOR.

VERT. SENSITIVITY - - 100 MILLIVOLTS/CM

VERT.

Apply 100kcsine

zontal of

deflectionineach closureofthe TIVlTYand HOR. inputtoobtainbefore. the input frequency until frequency phase ranges

4.13

The adjusted justed

1)

Adjustment:

controlsasfollows,

SENSe SENSe

- - • - - VERNIER

SENSITIVITY VERNIER

wavetoboth

inputs.

Adjust amplitude-to

pattern.

SENS.

approximately

Adjust

adjustment

also.

SWEEP GENERATOR

Vertical

completely.

Xl

Calibration:

Set

controlsasfollows,

C1S

for

shouldbegreater

on

.1

o

and

Horizontal

before

the

Sweep

0.1

--

- - - • - - - CAL

--

Vertical

give

direction.

SWitch both

to

-10

Adjust

VERT.

vOLtS/eM.

-the

same

closureofpattern.

the

pattern

VOLT/eM

than

just

150

and 1

amplifiers

Generator

VOLTS/CM

..

-

and

about6em

C107

pattern

Increase

opens.

kc.

VOLT/eM

can

-CAL

Hori-

for

SENSI-

Increase

as

This

Check

must

be

ad-

Connect input

TY,

tation.

marker marking. markers sions

Length

of

five

jorgraticul~

ZONTALPOSITION

always

Change appiyl-microsecond

terminals.

and TRIGGER just left-hand 4-2) of sweep (five

Change SWEEP

10-microsecond

terminals

and

SYNC, and TRIGGER

Adjust

on

coincide

(one

HORIZONTAL POSITION

the

traceisaligned with -last

Adjust

C226

with

marker

per

Adjustment,

sweep.

markers

Adjust C214

on

the

time

adjust

VERTICAL SENSITIVI-

LEVEL

(see

Figure

every

centimeter).

_to

obtain

(see

trace

coincide

divisions.Ifnecessary

so

last

marker

aligned

SWEEP

with

last

graticule

TIMEto5 l'dICROSECONDS/

time

markertoVertical

Adjust

VERTICAL

LEVEL

for

best

HORIZONTAL POSITIONso-sweep

for

graticule

equal

mark.

Adjust

spacingofmarkers

markers

TIME

per

to

20 and SWEEP EXPAND TO X5. ond

time

marker bestpresentation. so

sweep just markers per

starts

Cl06

(see

on

centimeter)o

to

Vertical

Adjust

on

left-hand

Figure

first

portionofsweep

HORIZONTAL POSITION

4-2)

-marker-to for

best

Vertical

presen-

so

graticule

4..2) so

major

last

graticuledivi-

Set R225, Sweep approximately10em Figure

4..2)

with

every

adjust

on the

marking

so

HORI-

trace

o

first

CMand

SENSITIVITY,

SYNC,

presentation.

starts

C105

(see

Figure

on

first

portion

centimeter).

l'dICROSECONDS/CM

Apply

input

graticule

for

l-microsec-

and

mark.

equal

(four

adjust

spacing

markers

last

five

rna-

is

input

Ad-

on

for

Ad-

of

SWEEP TIME - -

...-10

l'dILLISECONDS/CM

SWEEP EXPAND - - - - - - - - - - - - -

Connect

put

andchoose justXlSweep Gain

per

2)

10-millisecond

terminals.

Adjust

either

centimeter.

X5

Calibration:

Set

controlsasfollows,

Itime

TRIGGER

INT

+

or-for

Adjustment,

markertoVertical

LEVEL

best

R107,

SWEEP EXPAND

c·ontrol

pattern.

Ad-

for1marker

Xl

in-

X5

4)

Calibrate Set SWEEP'I1ME

50-microseconds/em

controlsasfollows,

- - -

50

l'dICROSECONDS/CM

VERNIER

SWEEP EXPAND - - - - - - - -

Connect input

TY, SYNC, and TRIGGER tation. coincidence

sion

lOO-microsecond

terminals

Adjust

and

C225

with

(one

marker

time

adjust

VERTICAL SENSITIVI-

LEVEL

(see

Figure

every

other

major

per2centimeters)o

Sweep:

to

CAUBRATE

...

- -

Xl

markertoVertical

for

best

presen-

4-1)

for

marker

graticule

divi-

Sect.

IV

Page 10

5)

CalibrateO.5-millisecond/cm

Set controls SWEEP

SWEEP

Connect put

SYNC, and TRIGGER LEVEL

I-millisecond

terminals

tion. AdjustC223(see incidence

marker

(one

6) Calibrate 50-milliseconds/em Sweep

as

follow

s,

TIME-_..

EXPAND

• 5

VERNIERtoCALmRATE

- - - - -..- - - - -

time

andadjust VERTICAL SENSITMTY,

Figure2..1)for

withevery

other

major

per2centimeters).

Sweep:

MILUSECONDS/CM

marker

for

toVertical

best

graticuledivision

presenta-

marker

Xl

in-

co-

8)

Hum: Set controlsasfollows,

SWEEP

SY'NC--------------·--

TRIGGER LEVEL - - - - - - - - - AUTO SWEEP

Connect 1kcsine wave to nals.

Turn

TIM:E - - 1 Mn.LISECOND/CM

IN'T

EXPAND - - - - - - - - -

the

Vertical

the SWEEP

TIME

VERNIER

-..

input termi-,

down

ap-

Xl

prOXimately 3:1 and tune to observe hum modula-

on

tion

sweep. Switch X5. Adjust Hum Balance contrOl, R360, mum hum. In addition,

.05

cm

shift in the

trace.

SWEEP

there

EXPAND switch to

for

mini-

should be

less

than

Set controls

SWEEP TIME -

S-WEEP

Connect lOO-millisecond input

terminals

as

EXPAND

and adjust

follows,

..

-

50

l\1ILUSECONDS/CM

VERNIER

-~- - - - - -..- -

time

VERTICAL

TY,SYNC, and TRIGGER LEVEL tation. Adjust R25I,50msec er

coincidence with

vision, (one

7)

Sweep Length:

marker

every per2centimeters).

Calibrate,

other

Set controls ·as follows,

SWEEP

Connect

cal

input

trol

for

Length Adjustment,

TIME-..

l-microsecond

terminal.

stable

Adjust TRIGGER LEVEL con-

pattern,ifnecessary.

- 200 l\1ICROSECONDS/CM

time

markerstotheVerti-

R225,for

to CALIBRATE

Xl

markertoVertical

SENSITIVI-

for

best

presen-

for

mark-

major

graticule

di-

Adjust Sweep

10.

5 cm of sweep.

Mechanical and

destroy

ization

9) Common-modeRejection:

Set. controls

VERT.

VERT.SENSrrIVITY SWEEP

shock its

is

most

SENSrrIVITY

TIME -

can

shielding

easily

accomplishedbyannealing.

as

follows,

-...

magnetize

properties.

...

- 10

the

CRT

shield

Demagnet-

MILLIVOLTS/CM

VERNIER - - - - CAL

O.

5

MILLISECOND/CM

.

Check balance of vertical amplifier (paragraph 4 step

1).

Apply 1 kc Vertical input ator

with

600

terminals

ohm termination. With the 200CD

sine

through

wave

from

an

fI;

350B

maximum output, switch in attenuation untU 1 cm

signalisdisplayed.

of

(remove grids. tionisagain should be

jumper)

Remove attenuation until a 1 emofdenec-

achieved. The attenuation removed

greater

and feed

Change input to balanced

same

signal

than 40 db.

...

200CD

Attenu-

into both

11

to

at

Sect.

IV

Page

11

1. Heavy or

Heavy

2.

Arrowsonpotentiometers

3. clockwise

Resistance

4. unless

5.

Rotary the

6.

Relays

t

7.

8.

Interconnecting

* Value adjusted

9.

1.

Each as

solid

feedback path.

box

otherwise

switch

indicatesa~selected

tube

follows:

line shows main

indicates

from

values

switch

assembly

shownincondition

socket

SCHEMATIC

signal

front-panel

indicate clockwise rotationasviewed from the round shaft end,

the

rectangular

in

ohms,

specified.

schematics

drawings.

part.

parts

and

assemblies

at

factory.

VOLTAGE AND

terminalisnumbered

engraving; light box

shaft

inductance in

are

electrical

prevailing

See

Part

DIAGRAM

path; heavy dashed line shows control, secondary signal,

end.

microhenries,

representations;

during

parts

are

may be omitted.

normal

list.

shown on cable diagram.

RESISTANCE

and

lettered

NOTES

indi~ates

instrument operation.

DIAGRAM

to indicate the tube element and pin number,

chass marking.

and capacitanceinmicromicrofarads

for exact sWitching details

NOTES

counter-

refer

to

*

H

K G

Sc

Sp

Hm

IS

The

numerical tube; the like

elementsinthe

socket

A

resistance

2.

Voltages

normal

shown when the

3. Voltage ments

noted.

4. A

solid

terminals;

resistance

tube

no

=

heater

.cathode

=

control screen

=

suppressor

=

heater

=

internal

letter

terminal

shown.

values

differences

measured

made

line

a dotted line between

are

element

grid

mid-tap

shield

subscript

subscripttotube-element

same with an

shown

between

circuit

at

with

an

between

givenatonly one of

grid

to

tube-element

tube

section,

asterisk

are

for

guidance;

instruments.

contains

the

electronicmultimeter,

socket

potentiometers,crystal

terminal

terminals

such

may be

is

shown above the line,

indicates

terminals

the

two joined

P

T

R

A

S Sh

NC

A

designators

astfor

used

values Resistance

may vary from those shown due to tube aging

from

a connection external to the tube between the

indicates'

terminals.

:::

plate target

=

reflectororrepeller

=

anode

=

spade

=

shield

=

no

•

indefinite readingdueto

=

.indicates the section of a multiple-section indicates the functional difference between

triode and p asatie

values may vary considerably from those

diodes,

terminal

a connection inside the tube. Voltage

(plate)

external

point and may have a voltage and

or

resistance

to

connection to socket

circuit

for

pentode.

electrolytic capacitors.

below the line;

chassis

ground unless otherwise

(see2.)

measure-

or

and

VIE

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BELOW

V202

START-STOP

V2

AMPLIFIER

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71

5001'000

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I

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V3B

• • SYNC

R35 33K

~

II<

DEFLECT PLATE

TO

VERTICAL

I-J

0 0 0

...,.

0)

I

~

04

COPYRIGHT

1958IVHEWLETT·PACKARD

Thil drowingIIlnt.nded anel

molntenonce0'Hewlett·'Clckorcl

ment

Gild

I. no, to reproduced without wrltte. H.wl.tt·Packarei Company.

IZOA

-VA

-

T-05IA

b."••

'or

.he op.....

d

oth.rwl..

con"nt"0'the

COMPANY

tlo.

e.lp.

0'

Figur.

4·3.

Vertical

Amplifier

t

+ 380VOC

rn

(I)

(')

rt"

<-

ttl

~

(I)

.....

W

Jl0t

HORIZ.

INPUT

CIOI

.1J.1F

TO

SYNC

SWITCH

FROM

SWEEP OUTPUT

S101

S~~I-

L 1 .J

--

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•

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SWITCH DETAIL

SWEEP I

TIME

,.Iv/cMI'

C236 :

il

V1CM

8204

SEE

SWEEP

m

+J80V

(1)

~

=a

RI19

30K

TO

HORIZ.

DEFL.

PLATE

02

V101A

6DJ8/ECC88

AMPLIFIER

I

Cl02

2.2

t

RI05

100

I

I I

t

I

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TIM,

RI12

lOOK

+IOOV

•

HORIZ.

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12K

RIIO

2.5K

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'C107

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OUTPUT

AMPLlF,ER

CII2

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(f)

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o

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0)

I

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REF. DESIGNATORS

C

101-112

J

101

RIOI

- 124

SIOI

-

103

VIOl -

102

COPYRIGHT

19~8

ev

drowln.

HEWLm·PACKAlO

I, Intended

bou••etothorwl'o or

Com,.,,)'.

'or

Thl' ond molntononco of Howlett·Pockord oqulp. mont onet I, not to roproducod without wrltton eon Howlott.Poelioret

COMPANY

tho oporotlon

..ntof

tho

r

100V

l

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102

t

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1M

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f'

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4-4.

Horizontal

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K

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100

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2.2

/

+J80V

Vl02B

TO

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PLATE

01

+

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O

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REF. DESIGNATORS

i C 201 _ 218 i

05201-

207

L201 R20

-

264

5201-202

V201 -

205

UNASSIGNED:

C

219-220.208.216

R214.215.218-220•.222

244-246,252-263

CO'YlIGHT 1958IVHEWlm·PACKAlD

Thl. drawing t. Into"dM for tho oporatlo"

ond ",olntononce of Howlott·'ackord oqulp. ",ont

andI.not tob.u••doth.rwl••or

r.produced

without

wrltt."

Howlon-PackardCo",pony.

120A

-

sa

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con••ntoftho

<lJ

TRIGGER

R247S.

I • I

1000

R204

3600

C204

22

R20!'

83K

C201

1.0

: O[jffi

15201

: V201

I 6ANa I

I

COMPANY

15

1

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t

V - I

C205

R248

24K

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[fRiGGERLE\JEL)

GENERATOR

R207

10K

I

I I

;0

I

•

I

1

....

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SENSITIVITY

R241

R210

561

200K

.....

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R206 3600

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C217~C207

47

t

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68

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·.0

Figure

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68K

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100

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270K

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REF. DESIGNATORS

o

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0)

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Figure

4-6.

Sweep

Time

Switch

COPYRIGHT

1958IVHEWlm

Thi.

eI,owlne I. .olnt."onc.

11'

OllelI.1I0t

In'.IIe1ed

of H.wl.tt.'ocko,et .qulp·

'0

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onel

...

,.p,oducoel wl'hout wrltt.1I con.o..t H.wl.".'ocko,d

.'ACK4RD

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b.

v

••eto.herwl.. or

.h.

COMPANV

op.,o.lolI

01

120A-ST-T·051A

tho

R303 150K

)R304

C304?560K

15

-u-

SR307

<'

3M

R300

+380V--...~.

470

r20lJ.F

--------fI------::;,3111L

200\.lH

V302

6AQ5

OSCILLATOR

1,7

COPYRtOHT

1958IVHEWLETT.PACKARD

This

drawingi,intended for the operation

and

maintenance of Hewlett·Packard equip.

i.

ment ond reproduced Hewlett.Packord

not tob.u..dotherwi,e

withoutwri".n

Co)'ftpony.

C300

L301

R301 1000

V301A&a

12

AMPLIFIER

•

C302

390

R302

47

K

"::'

COMPANY

conlent of the

AU?

or

G:L:fr-i' .

T301

120

A -

. _

__

,.......

~/1

V304

5642

RECTIFIER

HVPS-T-051A

R3051

1M

I'"J.:

.'

I

''.

r-,

R306

L5M

t

-150V

INTENSITY LIMIT

ITN!IN-SITvlO

,

...

~F

C307

1500

Figure

'·$~66~

C313 T

.051

I I

+100

® +

R330

47K

.-=-

T.002

-:IF}1

C310

1500

4-7.

V

R329

500K

C314

e.,..

C305

C306 3300

R319

8.2M

F

R320

8.2M

R321

8.2M

High

I FROM

. I FROM

~;08..

VERT:

_.~

HORIZ

'.

~

.~

R314

27

K

-

22'0

V

R328

47K

R325

1.5M

C312

.0

4-

15J..lf

GATEl+)

FROM PIN 3

OF

Voltag_Power

AMP.

AMP,

+

V203

Supply

V305

5AQP

CATHODE

RAY

~UBE

ASTIGMATISM

I • I • (

C309

3300

@

R315

27K

.~...-+380V

~2;':

R317

68K

~..-+IOOV

R31B

2.2M

-=-

z- AXIS

REF.

DESIGNATORS

C300-31i R300

T301 V 301 -

UNASSIGNE

C

303,311,315-320

R

322,324,326

o

...,.

0)

I

I.\)

-

330

305

0:

OJ

(I)

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<

I'd

cf4

(I)

......

-.l

Sect.IV

Page

18

T302

V306

5AR40R 5V4GA

RECTIFIER

450VAC

R331 1M

R332 1M

V309

6X4

RECTIFIER

V.307

12B4A

REGULATOR

R333

270K

R334*R335

560K

V310

12B4A

REGUlATOR

00016-2

R337

7.5K

.,.3BOV

•

R338*

"'336

1M

*

R348

18K

R349

18K

V308A

1/

6U8

2

AMPLIFIER

47K

C323

.OIJ,LF

-/$OV

405K

.....

-----

R339

136.7K

R340

ZooK

V30SB

1/26Ue

OUTPUT

CATHODE

FOLLOWER

C324

-

40j.lF

I-/OOV

REF.

DESIGNA

C

321-335 CR301 F301

OS303 -

Q 301

R331 - 361

5301-303

V306 T302

UNASSIGNED;

C325.327 R34l,342

5302

-.302

..:

307

312

TORS

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6AU6

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R343 t88M

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2.52M

• C33t

- 40J.l.F

V

CALIBRArOR

OUTPUT

VERT.

AM".

TO

V311

COf'ftIOHf

1958'"

on.

......

'1I'

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

........

'

..........

hr4~.

HIWU'fT.,ACICAID

el!I

fer

,

.,

lIM4

~

1I1

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COMPANY

.

.....

.,

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4·8.

__

~~

__

....__.....~__

...__...

__

~

ro

ISYNC I sELECrOR

V310

Low

Voltage

and

Fllam.nt

Supplie.

Sect.

V Page 1

.......

--

........

---------

Standard whenever from the

factory.

W

your

hen

1.

2.

~

Complete reference.

..........

-----

components

possible.

local

ordering

Stock

Hewlett-Packard

.....

------

have

Special

par

Number.

description

TABLE

NOTE-----.---

been

components

t s

alway

of

OF

used

representative

s

incIude

part

SECTION

REPLACEABLE

........--..........

in

this

may

:

including

----

........

instrument,

be

obtained

or

circuit

--.-...-

from

PARTS

........

0...-----

V

......

3.

4.

Corrections on

an

Instruction

manual.

Column quantities lated

Factory

MODEL

service.

Model If

partis

function

RS

in

to

Parts

AND

number

to

the

maintain

Order

Sales

SERIAL

not

and

location

Table

Manual

Table

Department.

NUMBERS

and

serial

liste

d,

of Change

lists

one

instrument

complete

number

give

comple

of

part.

Replaceable

sheet

the

recommended

spare

ALWAYS

OF

INSTRUMENTS

at

for

parts

of

instrument.

te

descr

Parts

the

one

MENTION

iption,

are

front

spare

year

kits

INVOLVED.

of

from

listed

this

parts

iso-

the

THE

Sect.VPage

2

00016-2

Model 120A

Circuit

Ref.

C1

C2

C3

C4

C5

C6 C7

C8

Capacitor:

15

Capacitor:',

ceramic,

Capac~tor:

0.1

Capacitor:

pf

:10%,

:20%,

JJi

fixed,

variable,

5-25

fixed,

3300 pf : 10%,

Capacitor:

270 Same"as Same Capacitor:

.01

as

pf

J.Lf

fixed,

±10%, C2 Cl

fixed,

:10%,

TABLE

Description

mica,

500 vdcw

trimmer,

pf

mylar,

600 vdcw

mica,

500 vdcw

mica,

500 vdcw

paper,

400 vdcw

OF

REPLACEABLE

PARTS

Mfr.·

76433

72982

09134

76433

$

Stock

No.

0140-0004 4

0130-0012

0170-0022

0140-0029 1

0140-0015 1

72928 0160-0054

TQ

3

1

3

C9,10

C11

C12 C13

C14

CI5

C16 C17

Cl8

C19

Capacitor:

2

pf:

5%,

Capacitor:

1500

pf

SameasC8

Capacitor:

2.2pf: 10%,

Capacitor:

560

pf:

Capacitor:

170-780

as

C13

Same Capacitor:

sections

4 includes

Capacitor:

0.7-3.0pf,

Capacitor:

.002

J.Lf

fixed,

titanium

dioxide,

500 vdcw

fixed,

±20%,

fixed,

mica,

500 vdcw

titanium

dioxide,

500 vdcw

fixed,

10%,

variable,

mica,

500 vdcw

mica,

pf, 175 vdcw

fixed,

electrolytic,

20 J.Lf/sect., 450 vdcw

C300, C326 variable,

pOlystyrene,

350 vdcw

fixed,

:20%,

ceramic,

1000 vdcw

78488 0150-0031 2

76433 0140-0058 2

78488 0150-0015

00853

0140-0044 2

72136 0131-0003 3

56289 0180-0025

72982

91480

0132-0005

0150-0023

6

1

4

C20thru C100

Not

assigned

Referto"ListofManufacturers'

•

TQ

Total

RS

Recommended

Quantity

usedinthe spares

instrument.

for

one

year

Codes".

isolated

service

for

one

instrument.

Model 120A

00016-2

Sect.VPage

3

TABLE

Circuit

Ref. Stock No.

Cl01

C102 C103

CI04 Cl05

C106

Capacitor:

0.1

Ilf

SameasC13 Capacitor:

.01

Ilf

SameasC13 Capacitor:

2-25

pf, 175 vdcw

Capacitor:

50-380 pf,

CI07 Cl08, Cll0

109

SameasC2 SameasC15

SameasC15

fixed,

±

10%,

fixed,

±20%,

variable,

175vdcw

Description

paper,

600 vdcw

ceramic,

1000 vdcw

mica,

OF

REPLACEABLE

PARTS

Mfr.

•

rFj)

56289 0160-0001

56289

72136

0150-0012

0131-0005

72136 0131-0001

TQ

1

8

3

1

C111 C112 Cl13thru

C200 C201

C202

C203 C204

C205, 206

C207

C208 C209

C210.

Same

as

C14 SameasC 103 Not

assigned

Capacitor:

1 pf,

±10%,

Capacitor:

•022 Ilf ±

Same

as

C1

Capacitor:

22

pf ±5%, 300 vdcw

Capacitor:

20

Capacitor:

Ilf,

fixed,

25 vdcw

fixed,

68 pf ±10%,

Not

assigned SameasC19 Capacitor:

fixed,

100 pf ±5%,

fixed,

10%,

fixed,

300 vdcw

titanium

500 vdcw

paper,

600 vdcw

mica,

electrolytic,

mica,

500 vdcw

mica,

dioxide,

78488

56289

~

76433

56289

00853

76433

0150-0029

0160-0003

0140-0034

0180-0045

0140-0025

0140-0041

1

2

1

2

1

*

Referto"ListofManufacturers'

TQ

Total

RS

Recommended

Quantity

usedinthe

spares

instrument.

for

one

year

Codes".

isolated

service

for

one

instrument.

Sect. V

Page

4

00016-2

Model 120A

Circuit

·Ref.

C211

C212 C213

C214

C215 C216 C217

C218

C219, 220 Not

Capacitor:

Same Capacitor:

Capacitor:

SameasCl03 Not" Capacitor:

Capacitor:

TABLE

Description

fixed,

pi±10%,

100

as

Cl03

fixed,

820 pf ±10%,

variable)

14-150 pf, 175 vdcw

assigned

fixed,

47 pf ±10%, 500 vdcw

fixed,

330 pf ±

assigned

10%,

mica,

500 vdcw

mica,

500 vdcw

mica,

500 vdcw

OF

REPLACEABLE

PARTS

Mfr.

•

76433

76433 0140-0010 1

72136 0131-0004

76433 0140-0032 1

00853 0140-0043

~

Stock No.

0140-0054 1

TQ

2

1

C221

C222

C223 C224

C225 C226

C227

C228 C229

C230

C231

Capacitor:

0.2

p.f±5%,

Capacitor:

.02 SameasC15 Capacitor:

.00181 SameasC214 Capacitor:

7-45 Capacitor:

.22 SameasC202 Capacitor:

220 pf ±

Capacitor:

220 pf ±

Capacitor:

150

±

/.If,

JLf±5%,

pf,

p.f±10%,

10%,

pi

±

10%,

fixed,

200 vdcw

fixed,

5%,

200 vdcw

fixed,

variable, 500 vdcw

fixed,

400 vdcw

fixed,

600 vdcw

fixed,

500 vdcw

fixed,

500 vdcw

mylar,

200 vdcw

ceramic,

paper,

mica,

84411

72982

56289

76433

72982

0170-0028

0170-0027

0170-0026

0130-0001

0160-0018

0160-0007

0140-0031

0140-0055

1

2

1

*

RefertoI'ListofManufacturers'

TQ

Total

RS

Recommended"

Quantity

usedinthe spares

instrument.

for

one

year

Codes".

isolated

service

for

one

instrument.

Medel 120A

00016-2

Sect.VPage

5

Circuit

Ref.

C232 C233 C234

C235 C236

C237

C238 C299

C300 C301

thru

SameasCl1 SameasC105 Capacitor:

470 SameasC105 Capacitor:

39 pf Capacitor:

150 pf ± Not

assigned

PartofC17 SameasCl9

pf

± 10%,

±

5%,

fixed,

TABLE

Description

mica,

500 vdcw

mica,

500vdcw

silver

500 vdcw

mica,

OF

REPLACEABLE

Mfr.

76433

00656

*

PARTS

<fj)

Stock No.

0140-0027

0140-0035

0140-0067

TQ

1

C302

C303 C304 C305 C306

C307

C308 C309 C310 C311 C312

C313

Capacitor:

390 pf

assigned

Not SameasC1 SameasC8 Capacitor:

.0033

Capacitor:

1500 pf SameasCI03 Same SameasC307 Not

assigned

Capacitor:

.015 Capacitor:

.051

±

Jlf ± 20%,

as

C306

Jlf ± 10%,

Ilf,

fixed,

5%,

fixed,

± 20%,

fixed,

±

10%,

mica,

500 vdcw

paper,

6000 vdcw

paper,

5000 vdcw

paper,

3000 vdcw

paper,

200 vdcw

00853

56289

00853

0140-0016

0160-0046

0160-0061

0160-0062

0170-0003

1

2

1

C314

SameasC19

*

RefertoI'ListofManufacturers'

TQ

Total

RS

Recommended

Quantity

usedinthe spares

for

instrument.

Codes".

one

year

isolated

service

for

one

instrument.

Sect.VPage

6

00016-2

Model 120A

Circuit

Ref.

C315

thru

Not

assigned

C320 C321

C322

Capacitor:

1

section,

Capacitor:

2

sections

(includes

C323

C324 C325 Not C326 C327 Not

Capacitor:

.01

JJ.f

Part

of C322

assigned

Part

of C17

assigned

±

C328 SameasC322

Description

fixed,

120

fixed,

120 x 40

C324)

fixed,

10%,

600 vdcw

(includes

TABLE

electrolytic,

Ilf,

350 vdcw

electrolytic,

p,f,

450 vdcw

paper,

C331)

OF

REPLACEABLE

Mfr.

56289

*

PARTS

~

Stock No.

0180-0042

0180-0030

0160-0002

TQ

1

2

1

C329

C330 C331 C332

C333 C334 C335 CR1

thru

CR300 CR301

DSl

thru

08302 D8303 D8304

thru D8307"

Capacitor:

O.

Same Part

of C322

Capacitor:

1

section,

fixed,

1 Ilf ± 10%, 400 vdcw

as

C~03

fixed,

SameasC103 SameasC229 SameasCI03

Not

assigned

Diode,

Not

Lamp Lamp

silicon,

ma,

500

assigned

incandescent: incandescent:

6-8

V, . 15

100

paper,

electrolytic,

500 Ilf,50vdcw

power: volts

PlV

2 pin, #12

amp,

#47

56289

0160-0013

56289 0180-0047

75042

24455 24455

1901-0008

2140-0012 2140-0009

1

1 4

*

Refer

TQ

Total

RS

Recommended

to

I~List

Quantity

of

Manufacturers' usedinthe spares

for

Codes".

instrument.

one

year

isolated

service

for

one

instrument.

Model120A

00016~2

Sect. V

Page

7

Circuit

Ref.

11

thru

1200 1201

thru 1204

1205,206

207

1208

thru

1300 1301, 302

thru

F1 F300

F301

Not

assigned

Lamp,

Not

Sameas1201

Not

Fuse,

neon:

( green" code)

neon:

(blue code)

assigned

slow~blow:

2

amp,

Description

aged

for

115

TABLE

and

selected

and

selected

volt

operation

OF

REPLACEABLE

Mfr.

28480

71400

*

PARTS

~

Stock No.

G~84D

G-84B

2110-0006

TQ

6

3

1

Jl

J2 J100

J10l

L20l L3D1

P301 Q301

thru

Fuse,

slow-blow:

amp,

1

Binding Binding

with

Not

assigned

Binding Binding

Coil, Coil, RF: 200

Power

Transistor,

for

Post, Post,

ground

Post,

RF: 500

Cord

230

volt

operation

insulated: insulated,

link

insulated: insulated:

tJ,h tJ,h

power: 2N301

red

black,

red

black

71400

28480 28480

28480 28480 AC-10C

99848 28480

28480

02735

2110-0007

AC-IOD 2 G-76K

AC-IOD

9140-0022 9140-0019

8120-0050

1850-0038

1

1 1

1

Q302

Transitor,

*

TQ

RS

amplifier:

2N383

Referto('ListofManufacturers' Total

Quantity

Recommended

used spares

in the

for

instrument.

one

year

94154

Codes".

isolated

18'50-0040

service

for

one

instrument.

1

Sect. V

Page

8

00016-2

Model 120A

Circuit

Ref.

R1

R2

R3

R4

R5

Ra,7

R8

R9

Resistor:

1000

Resistor:

9000

Resistor:

990, 000

Resistor:

900, 000

Resistor:

100, 000

Resistor:

1 megohm ±

Resistor:

100, 000

Resistor:

100

Description

fixed,

ohms±1%,

fixed,

ohms±1%,

fixed,

ohms±1%,

fixed,

ohms±1%,

fixed,

ohms±1%,

fixed,

5%,

fi;xed,

ohms±10(1b,

fixed,

ohms±10%,

TABLE

deposited

1/2

deposited

1/2

deposited

W

1/2

carbon,

W

carbon,

W

carbon,

W

composition,

1/2

W

composition,

1/2W

composition,

1/2

W

OF

REPLACEABLE

Mfr.

19701

01121

PARTS

*

Stock No.

0727-0100

0727-0152

0727

0727-0259

0727-0208

0686-1055

0687-1041 2

0687-1011

<fPJ

...

0269

TQ

1

3

10

RlO

Rll

R12

R13 R14

R15

R16

R17 R18

R19

Resistor:

80,000

Resistor:

59480

ohms

Resistor:

500

ohms,

Same

as

Rll

Resistor:

1000

ohms

Resistor:

500, 000

Resistor:

18, 000 SameasR9 Resistor:

250, 000

SameasR9

fixed,

deposited

ohms±1%,

fixed

deposited

±l%,

variable,

2 W

fixed,

composition,

± 10%,

variable,

ohms±20%,

fixed,

composition,

ohms±10%,

variable,

ohms±20%,

carbon,

1 W

carbon,

1/2W

wirewound,

1/2

W

composition,

1/4

W

1/2

W

composition,

1/4

W

19701

71450

01121

71450

01121

71450

0730-0062

0727-0197

2100-0054

0687-1021

2100-0174

0687-1831

2100-0175

2

1

4

1

3

1

*

Referto"ListofManufacturers'

TQ

Total

Quantity used.in the

RS

Recommended

spares

instrument.

for

one

year

Codes".

isolated

service

for

one

instrument.

Mode1120A

00016-2

Sect..V

Page

9

Circuit

Ref.

R20

R21 R22

R23

R24 R25,

R27, 28 R29

26

Resistor:

7500

ohms Optimum Average

assigned

Not Resistor:

98,000

Resistor:

linear

as

R22

.

Same Resistor:

39,000

SameasR9 Resistor:

22,000

fixed,

±1%,

value

fixed,

ohms

variable,

taper,

fixed,

ohms

fixed,

ohms

TABLE

Description

deposited

1

carbon,

W

selectedatfactory.

shown.

deposited

±1%,

carbon,

1W

composition,

500

ohms

±lO%

composition,

±10%,

1/2W

composition,

2W

±5%,

OF

REPLACEABLE

PARTS

Mfr.

19701

1.2697

*

rf/J

Stock

No.

0730-0024 1 1

0730-0068

2100-0019 1

01121 0687-3931

01121

0693-2235

TQ

2 1

2

RS

1

R30

R31

R32

R33 R34 R35 R36

R37thru RlOO

Rl01

R102

R103

Resistor:

8200

ohms

Resistor:

33,000

ohms

Resistor:

1500

ohms SameasR30 Same

as

R29

Same

as

R31

Resistor:

470

ohms

Not

assigned

Resistor:

linear

Resistor:

variable,

taper,

fixed,

120,000

Resistor:

1

fixed,

megohm

fixed,

±10%,

fixed,

±lO%,

ohms

±10%,

composition,

W

1

composition,

± 10%,

2 w

composition,

:1:10%,

1/2

composition,

1/2W

composition,

500,000

composition,

l/2W

±5%, composition,

1/2

W

ohms

W

01121

0690-8221

0693-3331

01121 0687-1521

01121

71590

01121

0687-4711

2100-0015

0686-1245

0687-1051

2 1

2

1

3

2 1

3

8

1

2

*

Refer

TQ

Total

RS

Recommended

to

IIList

Quantity

of

Manufacturers' usedinthe spares

for

Codes".

instrument.

one

year

isolated

service

for

one

instrument.

Sect. V

Page

10

00016-2

Model120A

Circuit

Ref.

RI04

SameasH8 R105 SameasR9 Rl06

Resistor:

22, 000

RI07

Resistor:

linear

R108

Resistor:

linear

R109

RI10

RIll

Resistor:

2700

Resistor:

2500

Resistor:

ohms

12, 000

Rl12

Resistor:

100, 000

Description

fixed,

ohms

composition,

± 10%,

variable,

taper,

50, 000

variable,

taper,

fixed,

± 10%,

5000

composition,

variable,

:1::20%,

fixed,

composition,

ohms±5%,

fixed,

ohms

composition, ±

TABLE

1/2

W

composition,

ohms,±20%

composition,

ohms

1/2

W

composition,

1/2

W

1/2

W

10%~

1 W

OF

REPLACEABLE

PARTS

Mfr.

*

@j)

Stock No.

TQ

01121 0687-2231 1

71590

2100-0013

71590 2100-0011 1

0687

..

01121

71590

01121

2721

2100-0067

0686-1235 2 1

0690-1041

2

1 1

2

3

RS

1

R1l3

Resistor:

2 rear

includes R114 R115 R116 R117,118 R119

SameasRIIO

SameasR112 SameasR111 SameasR9

Resistor:

30, 000

R120

Resistor:

6800

R121

Resistor:

10,000

R122

Resistor:

1800 R123 Same R124

SameasRl19

variable,

sections,

section:

R257

fixed,

ohms±5%,

fixed,

ohms±10%,

fixed,

ohms

fixed,

ohms

as

Rl20

composition,

50, 000

ohms±20% 100, 000 and

S103

composition,

2 W

composition,

1/2

composition,

±10%, 2 W

composition,

±10%,

1/2

ohms±20%,

W

71450

01121

2100-0173 1

0686-3035

0687-6821

0693-1031

0687-1821

1

2

1

*

Referto{'ListofManufacturers'

TQ

Total

RS

Recommended

Quantity

usedinthe spares

instrument.

for

one

year

Codes".

isolated

service

for

one

instrument.

Model 120A

00016-2

Sect.VPage

11

Circuit

Ref.

R125 R199

R200 R201 B202 R203 R204

R205

R206 R207

R208

thru

Not

assigned

SameasR14 SameasR103 SameasR9 SameasRI03 Resistor:

3600

Resistor:

83, 000 SameasR204 Resistor:

10,000 Resistor:

24, 000

fixed,

ohms±5%,

fixed,

ohms±1%,

fixed,

ohms

fixed,

ohms

T'ABLE

Description

composition,

1/2

W

deposited

1/2

composition,

± 10%,

composition,

±5%,

1/2

1W

OF

carbon,

W

REPLACEABLE

Mfr.

01121

19701

01121 0687-1031

01121

•

PARTS

fj)

Stock

No.

0686-3625

0727-0202

0689-2435

TQ

2 1

1

1 1

2

RS

1

R209

R210

R211 R212

R213 R214,215 R216

R217

R218

thru

R220 R221

R222

R223

Resistor:

100, 000 Resistor:

200;000

includes SameasR102 Resistor:

71,560 SameasR102

Not

assigned

SameasR16

SameasR9 Not

assigned

SameasRl12 Not

assigned

Resistor:

1000

fixed,

ohms

variable,

ohms

fixed,

ohms

fixed,

ohms

8202

±1%,

composition,

1/2

±5%,

composition,

±20%,

deposited

±

deposited

1%,

1/2

1/4

W

carbon,

01121

71450

19701

0686-1045

2100-0171 2 1

0727-0201 1

0727-0100

1

.

1

•

Referto"ListofManufacturers' Total

TQ

Recommended

RS

Quantity

usedinthe spares

instrument.

for

one

year

Codes".

isolated

service

for

one

instrument.

Sect. V

Page

12

00016-2

Model 120A

Circuit

Ref.

R224

R225

R226

R227 R228

R229 R230

R231

Resistor:

27,000

Resistor:

680, 000

Resistor:

18,000 SameasR224 Resistor:

taper, Same Resistor:

430, 000 Resistor:

taper,

as

fixed,

ohms

fixed,

ohms

fixed,

ohms

variable,

20,000

R224

fixed,

ohms

variable,

250, 000

TABLE

Description

composition,

:1:10%,

composition,

:1:10%,

ohms

composition,

1/2

:1:10%,

:1:5%,

ohms

1/2

2W

composition,

:1:30%,

1/2

composition,

OF

REPLACEABLE

W

linear

1/3

W

linear

Mfr.

01121

71450

01121

71450

*

PARTS

~

Stock

No.

0687-2731

0687-6841

0693-1831

2100-0260

0686-4345

2100-0158

TQ

6 2

1

1 1

1

1 1

RS

1

R232,233

R234

R235

R236

R237 R238

R239

R240 R241

R242

R243

Resistor:

220,000 Resistor:

27,000·

Resistor:

24,000

Resistor:

160,000

Same

as

Resistor:

2

megohms

Resistor:

470

Same

as

Resistor:

100,000

Resistor:

820,000

Same

as

R7

ohms

R224

R36

fixed,

ohms

fixed,

ohms

fixed,

ohms

fixed,

ohms

fixed,

:1:10%,

fixed,

ohms

fixed,

ohms

composition,

:1:10%,

metal

film,

:1:5%,

1/2

:1:10%,

4W

1/2

W

:1:10%,

composition,

:1:5%,

composition,

±5%,

composition,

1/2

W

2W

1/2

W

01121

07115

01121

0687-2241

0771-0006

0686-2435

0686-1645

0686-2055

0687-4711

0693-1041

0687-8241

2

1

2

1

*

RefertoI$List of

TQ

Total

RS

Recommended

Manufacturers'

Quantity used in the

spares

for

Codes".

instrument.

one

year

isolated

service

for

one

instrument.

Model

120A

00016-2

Sect.VPage

13

Circuit

Ref.

R244

R245,246

R247

R248 R249

R250

R251 R252

Not

assigned

Resistor:

10

Resistor:

1000 SameasR208 Resistor:

56,000 Resistor:

3900 SameasR107 Resistor:

22,000

fixed, composition, 01121

ohms

variable,

ohms

fixed, composition,

ohms

fixed,

ohms

fiXed,

ohms

Description

±10%,

±30%,

±5%,

composition,

±10%,

composition,

±10%,

TABLE

1/2

W

composition,

3W

1/2

W

1/2

W

1/2

W

OF

REPLACEABLE

PART~

Mfr.

*

71450 2100-0155 1

01121

fj)

Stock No.

0687-1011 2

0686-5635 1 1

0687-3921

0687-2231

TQ

1

RS

1

R253

R254A,B thru R256

R257 R258

R259

R260

R261

R262

R263

R264

Resistor:

47,000

Resistor:

3

megohms

Part

of R113

Resistor:

39,000

Resistor:

270,000 Resistor:

20,000

Resistor:

2

megohms

Resistor:

200,000

Resistor:

1.8

Resistor:

68,000

fixed,

ohms

fixed,

ohms

fixed,

ohms

fixed,

ohms

fixed,

ohms

fixed,

megohms

fixed,

ohms

composition,

±10%,

deposited

±1%,

composition,

±10%,

composition,

deposited

±1%,

deposited

±1%,

deposited

composition,

±10%,

±1%,

1

1/2

1/2W

1/2

W

carbon,

W

1/2

carbon,

W

carbon,

W

carbon,

W

01121

19701

01121

19701

01121

0690-4731

..

0727-0292 3

0687-3931

0687-2741

0727-0173

0727-0287

0727-0221

0727-0285

0687-6831

1

1 1

1

2

1

*

RefertottListofManufacturers'

TQ

Total

RS

Recommended

Quantity

used spares

in the

instrument.

for

one

year

Codes".

isolated

service

for

one

instrument.

Sect. V

Page

14

00016-2

Model 120A

Circuit

Ref.

R265thru R299

R300 R301 R302

R303

R304

R305 R306

assigned

Not

SameasR36

as

47,000

150, 000

560,000

megohms

1.5

R14

fixed,

ohms

fixed,

ohms

fixed,

ohms

fixed,

Same Resistor:

Resistor:

SameasR103 Resistor:

TABLE

Description

composition,

±10%,

composition,

±10%,

1/2

2W

1W

OF

REPLACEABLE

W

PARTS

Mfr.

*

01121

01121 0693-1541 1

01121 0690-5641

01121

~

Stock No.

0687-4731 4

0687-1551

TQ

RS

1

2

1

2

R307

R308

R309

R310, 311

R312

R313

R314,315 R316

R317 R318

R319thru R321

Resistor:

3

Resistor:

taper,

Resistor:

4.7

Resistor:

5.6

Resistor:

3.5

Resistor:

680,000 Same R·esistor:

125, 000 SameasR264 Resistor:

2.2

Resistor:

8.2

fixed,

megohms

variable,

1

fixed,

megohms

fixed,

megohms

variable,

megohms

fixed,

ohms

as

R224

variable,

ohms

fixed,

megohms

fixed,

megohms

composition,

±5%,

megohm

composition,

±10%,

composition,

±10%,

±30%,

composition,

±10%,

composition,

±10%,

composition,

±10%,

1/2

W

composition,

±30%

2W

composition,

1/2

W

1/2

W

linear

1/2

2W

taper,

W

linear

01121

71590

01121 0693-4751

01121

12697

01121

71450

01121 0687-2251

01121

0686-3055 1 1

2100-0074 3 1

0693-5651

2100-0105

0687-6841

2100-0073 1 1

0693-8251

1 1

2

1

3

1

*

Referto"ListofManufacturers'

TQ

Total

RS

Recommended

Quantity

usedinthe spares

instrument.

for

one

year

Codes".

isolated

service

for

one

instrument.

Model 120A

00016-2

Sect. V

Page

15

Circuit

Ref.

R322 R323

R324

R325 R326 R327 R328

R329 R330

R331,332

assigned

Not

as

Same Not Same Not SameasR14 SameasR302 SameasR10l SameasR302 SameasR103

R210

assigned

as

R306

ass

igned

TABLE

Description

(includes

S301)

OF

•

REPLACEABLE

Mfr.

PARTS

•

<fiJ

Stock No.

TQ

RS

R333

R334

R335 R336 R337

R338

R339

R340

R341,342 Not

Resistor:

SameasR304

Same Same Resistor:

Resistor:

270, 000 Optimum Average

Optimum A

verage

asR302

as

Rl03

7500

ohms

405,000

Optimum

Average

136, 700

200, 000

assigned

fixed,

ohms

value

fixed,

ohms

value

fixed,

ohms

fixed,

ohms

composition,

±10%,

selectedatfactory

shown

selectedatfactory

shown

wirewound,

±10%,

deposited

±1%,

selectedatfactory

shown

deposited

±1%,

deposited

±1%,

1W

.

lOW

carbon,

1/2

carbon,

1/2

carbon,

1/2

W

01121

35434

19701

0690-2741

0816-0007 1

0727-0240

0727-0216

0727-0221

1 1

.

1 1

1

R343

Resistor:

1.88

*

TQ RS

fixed,

megohms

Referto"ListofManufacturers' Total Recommended

deposited

±1%,

Quantity

carbon,

1/2

W

usedinthe

spares

for

instrument.

one

year

19701

Codes".

isolated

0727-0286

service

for

one

instrument.

1

Sect. V

Page

16

00016-2

Model 120A

Circuit

Ref.

R344 R345

R346 R347

R348,349

R350

R351

R352 R353

as

2.52 as

82,000

18,000

as

15,000

R308

fixed,

megohms

R242

fixed,

ohms

fixed,

ohms

RIG

fixed,

ohms

Same Resistor:

'Same

Resistor:

Same Resistor:

SameasRI03

Resistor:

2.7

' fixed,

ohms

TABLE

Description

deposited

:t:l%,

composition,

:t:l0%,

composition,

:t:l0%,

composition,

±10%,

composition,

:t:10%,

1

1/2

2

1/2W

W

carbon,

1/2

W

OF

REPLACEABLE

W

PARTS

Mfr. *

<fp;

Stock

No.

19701 0727-0289

01121

0687-8231

0693-1831 2

0687-1531

01121 0699-0005

TQ

1 1

1

1 1

RS

1

R354

R355

R356 R357

R358

R359

R360

R361

Resistor:

4440

Resistor:

27,500

fixed,

ohms

fixed,

ohms SameasR308 Resistor:

2. 52

Resistor:

2.4

Resistor:

500

Resistor:

taper,

Resistor:

25

fixed,

megohms±1%,

fixed, composition,

megohms

fixed,

ohms

variable,

500

variable,

ohms

:t:1%,

:t:l%,

ohms

:t:l0%,

deposited

:t:l%,

deposited

:t:5%,

deposited

1/2

wirewound, :t:30%,

1/2

W

1/2W

1/2

W

carbon,

W

carbon,

3/10

.

linear

W

wirewound, 71450

2

W,

includes

S303

19701

01121

19701

0727-0134

0730-0044

0727-0289 1

0686-2455 1

0727-0077

71450 2100-0078

2100-0140

1

1 1

1

*

Referto"ListofManufacturers'

TQ

Total

RS

Recommended

Quantity

usedinthe spares

instrument.

for

one

year

Codes".

isolated

service

for

one

instrument.

Model 120A

00016-2

Sect. V

Page

17

Circuit

Ref.

Sl 82 S3

thru

S100 S101 8102 S103 S104thru

S200 S201 SWitch, 8202 S203

SWitch, Vertical Not

assigned

Same Switch, toggle:

PartofRl13

Not

assigned

Fart

Not

assigned

toggle:

Sensitivity

as

S1

rotary:

of B210

TABLE

Description

SPST

Switch

SPDT,

SYNC

SWEEP EXPAND

OF

REPLACEABLE

Assembly

PARTS

Mfr

..

*

04009 28480 120A-19A

04009

76854

~

Stock No.

3101-0001

3101-0002

3100-0175

TQ

2

1

RS

1 1

1

S204

S205thru S300

S301 S302 Not S303

T301 T302

VIAB V2AB

V3AB Tube,

Sweep

Sensitivity

.

Not

Part

Transformer, Transformer

Tube,

Tubes

willbesupplies

-hp-

EIA

in specifications.

Time

assigned

of R323

assigned

of R361

electron:

·selected

stock

standards

the

instrument

electron:

and

Horizontal

Switch

high

,power

12AU7

number),

will

12AT7

Assembly

voltage

for

best

by

-hpnormally

operating

performance

(if

ordered

but

tubes

within

meeting

result

by

28480

.

28480 28480

28480

33173

120A-19B 1

120A-IIA-l

9100-0095

G-73R

1932-0027

1 1

2

2 2

1

•

1 1

2

*

Referto"ListofManufacturers'

TQ

Total

RS

Recommended

Quantity

usedinthe spares

instrument.

for

one

year

Codes""

isolated

service

for

one

instrument.

Sect.VPage

18

00016-2

Model 120A

Circuit

Ref.

V4

thru

VI00 VI0IAB

Not

Tube,

Tubes will

-hp-

EIA

the spec

V102

V103thru

V200

V201 Tube, V202 V203,204 Tube,

SameasV3

Not

Tube,

assigned

electron:

selected

be

stock

standards

instrument

ification

assigned

electron:

Description

6DJ8!ECC88

supplied

number),

s.

6AN8 6U8 12AU7

TABLE

for

best

by

-hp-

but

normally

will

operating

OF

REPLACEABLE

performance

(if

ordered

tubes

meeting

result

within

*

Mfr.

28480

by

in

82219 33173 1933-0004 33173

PARTS

.r$p;

Stock

No.

G-73Z

1933-0001 1

1932-0029 3

TQ

RS

1

3

3 3

V205 V206thru

V300 V301 V302 V303,304 V305

Same Not

Same Tube, Tube, Tube,

(normally

P2,

V306 V307 V308 V309 V310 V311 Tube, V312

Tube, Tube, SameasV202 Tube, SameasV307

Tube,

as

V202

assign'ed

as

V203 electron: electron: cathode

7, electron: electron:

electron:

electron: electron:

6AQ5 5642

ray:

supplied

11

or

with P 1

available)

also 5AR4or5V4GA 33173 12B4A

6X4

6AU6 5651

phosphor.

82219 82219 82170

33173

33173 86684

1923-0018 1920-0001 2 2090-0007

1930-0003 1921-0010

1930-0016

1923

...

0021

1940-0001 1

1

1 2

1

2

1

1 1

*

Referto"List

of Manufacturers'

Codes". TQ Total Quantity used in the instrument. RS

Recommended

spares

for

one

year

isolated

service

for one instruutent.

Model 120A

00016-2

Sect.VPage

19

Circuit

Ref.

Bail,

cabinet Bracket Chassis Coupler,

Detent,.

Filter,

Fuseholder Graticule, Insulator, Jewel,

and slides,

cabinet

CRT:

pilot

TABLE

Description

MISCELLANEOUS

tilting

base

clamp··assembly

pair,

nylon,

insulated

bail,

plastic

amber blue green

CRT

binding.

lamp

post:

double

OF

REPLACEABLE

for

right

and

black

CRl'

left

Mfr.·

28480

28480 28480 28480 28480

28480 28480

75915 28480 28480 72765

PARTS

tfj)

Stock No.

G-44A-5

120A-12A G-16G/H AC-32A 400D-44A

120A-83A

120A-83B

120A-83G

1400-0007 1

120A-83C 1 AC

...

54A 4

1450-0020 1

TQ

1 1 1

2

RS

o o

o

o o

o

1

o o

o

Knob: FOCUS, IN'TENSITY,VERT. POS.,

HORIZ. POS., SCALE LIGHT

Knob: SYNC

VERT.

Knob:

SWEEP TIME Knob: VERNIER Levertoadjust

Rear

protective

"

Caution

Socket, tube: 9 Socket, tube: 7 Socket, tube: 7 Socket, tube: Socket, Socket,

Strap,

copper,

Tube,

shield

SENSITIVITY

High

octal transistor CRT

for

(red)

CRT

board,

Voltage"

pin pin pin

high

HOR.

position

voltage

SENSe

transformer

28480

28480 28480

28480 28480 28480

91662 91662 71785 71785 71785 91662

28480 91662

G-74D

G-74N G-74Q

G-74AU 2

130A-49B 120A-41C

1200-0008 1200-0009 1200-0017 1200-0020 1200-0041 1200-0037

120A-11A-2

1220-0008

-2

14

5

o

1

o o

o

1

3

1

o

Tube,

shield

•

Referto"ListofManufacturers'

TQ

Total

Quantity used in the

RS

Recommended

spares

instrument.

for

one

year

71785

Codes".

isolated

1220-0009

service

for

1

one

instrument.

o

LIST

OF

MANUFACTURERS

The follo and H4-2 (Code

win

9 code

numbe"

to

Name) and their latest supplements. The

are from the Federal Supply

Code

for Manufacturers Cataloging Handbooks

date

of revision and the

date

H4-1

(NametoCode)

of the supplements used

appear

at

the bottom of each page. Alphabetical codes have been arbitrarily assignedtosuppliers not appearinginthe H4 handbooks.

N.J.

III.

N.J. N.Y.

Ohio

N.J.

Calif.

Ky.

Ind.

Ohio

N.H.

N.C.

Conn.

N.Y.

Mass.

N.J.

Calif.

Conn.

Ohio

N.J.

Conn.

Calif. Calif.

Mich.

Conn.

CODE

NO.

72619 7265'

72758 72765 72825 72928 72982 73061 73138

7 3 2 9 3

7 3 4 4 5

73506 73

559

7 3 6 8 2

III.

73743 73793 73905 14455

74861

III.

74868· 74970

Pa.

75042 7 5 3

7 5

382

758 75

9 1 5 Litttefuse Inc. Des Plaines, III.

76005

Pa.

76210

76433

76487 76530 76545 76854 77068

7 7 2 2 1 Phaostron I

fli.

77342

77630 77634 77638 77764 78283 78471 78488

79142

79251

79963

III.

a

01 80248 80411 80486 80583

III.

80640

N.J.

81030

III.

a1 a1

MANUFACTURER

Dianght

Corp.

General

Ceramics

Girard-Hopkins

Drake Mfg. HughH.Eby Inc.

Gudeman

Erie Resistor Hansen

Mfg.

HeHpot

Div.ofBeckman

nstrumenn,

I

Hughes

Products

Div.ofHughes

Amperex

North

American

Bradley

Semiconductor

Carling

Electric, Inc.

GeorgeK.Garrett Fischer

Special

The

General JenninCJs Radio Mfg. J•.H. Winns,

Industrial Co.ndenser Industrial Products E.F.Johnson International

78

James

Knights

Kulka Electric Mfg.

1 8 Lenz Electric Mfg.

Lord Mfg.

C.

W.Marwedel

Micamold James

Millen Mfg. Monadnoc:k Mills San Mueller Electric Oak

Manufacturing

Bendix·

Corp.,

Pacific Div. No. Hollywood, Electronic

Potter

and

Condenser

Radio

Radio Essentials Inc. Mt. Vernon, N.Y. Radio

Receptor

Resistance

Indicator

Signal

Tilley Mfg. Stackpole Veeder Wenco Zierick Mfg. Times Facsimile

30

Oxford Acro

Manufacturing

All

Star HammerlundCo•• Stevens,

nternational

I

41

5

Wilkor

453

Raytheon Mfg.

Tube Division

Corp.

Co.

Corp.

Co.,

Inc.

Aircraft

Electronic

Root, Inc. Mfg.

Electric

Products

Arnold,

Products, Inc.

Co.,

Phillips

Co.,

Mfg.

Co.

Industries

and

Sons

Co.

Resistance

Co.

Co.,

Co.

Electronic: Mfc;.

Co.,

Co.

Bendix

nstrument

Co.

Brumfield, Inc. Princeton, Ind.

Co.

Co.,

Products

Co.

Corp.

Co.

Carbon

Co.

Corp.

Inc. Defiance,

Inc. New York, N.Y.

CO'

Instruments, Inc.

Co.,

Brooklyn, N.Y.

Keasbey,

Oakland,

Philadelphia,

Princeton, Ind.

Fullerton,

Co.

Newport

Div.

of

Co.,

Hicksville, N.Y.

Corp.

New

Haven,Conn.

Hartford,

Inc.

Philadelphia,

Cincinnati,

Co.

San

Winchester,

Corp.

Danbury,

Waseca,

Co.

Philadelphia,Pa.

Inc.

Mt. Vernon, N.Y.

San Francisco,

Corp.

Inc.

Mald.n,

Leandto,

Cleve.land,

and

South

Pasadena,

Inc. Brooklyn, N.Y.

Harrisbur9, New York, N.Y.

San Francisco,

Hartford,

New Rochelle, N.Y.

New York, N.Y.

Co.

Columbus,

Inc. Boston, Mass.

l

New

Cleveland,

Industrial

ADDRESS

N.J.

Calif.

Chicago,

Erie, Pa.

Calif.

Beach,

Calif.

Inc.

Conn.

Ohio

Elyria,

Ohio

Jose,

Calif.

Mass.

ChicaCJo,

Conn.

Minn.

Sandwich, III.

Chicago,

Erie, Pa.

Calif.

Brooklyn, N.Y.

Mass. Calif.

Ohio

Chicago,

Calif. Calif.

Camden,

Calif.

St. Marys, Pat

Conn.

Chicago,

Haven,

Conn.

Quincy, Mass.

CODe

MANUFACTURER

NO.

00334

Humidlal

0033

5

Westrex

0065

6 Aeroyox

o0 7 8 1

Aireraft

00853

Sanfilamo Electric

o

Oa9

1

CarlE.Holmes

o1 1 2 1 AUen Bradley

01255

Litton Industries, Inc. Beverly Hills,

0128

1 Pacific

o1 2 9 5 Texas I,ostruments, fnc.

o1

349

The

o2 1 1 4

Ferroxcube

022

8 6

Cole

02660

Amphenol· Electronics

o2 7 3 5

Radio

o2

777Hopkins

03508

o

37

0 5

o3 7 9 7

04009

o4 2

2·2Hi-Q

o

44

0 4 Dymec Inc. Palo Alto,

04

6 5 1

047

1 3

047

7 7

o5 6 2 4

a5

71

3

o

60

0 4 The Bassick·

o6 a1 2 Torrington Mfg.

o7 1 1 5

o

7·

2 6 1

07

26

3 Fairchild

o7 , 3 3 Rheem

07980 08718

08733 08792

09134 09250 10446 12697

14655 1

5909

1

6758

1

88

73

193

1 5 Eclipse Pioneer, Div. of

Co.

Corp.

Radio

Corp.

Co.

Semiconductors,

Semiconductor

Alliance

Mfg.

Corp.ofAmerica

Mfg.

Co.

Corp.ofAmerica

Semiconductor

Engineering

G.E.

Semiconductor

Apex

MachineIeTool

Eldema

Corp.

Arrow.

Hart

and

Divi$ionofAeroyox Myrtle Beach, S.C.

Special

Tube

Sylvania

Electronic Motorola, Automatic Barber

Stewart

Corning

Avnet

Boonton Radio

Cannon·

Camloc CBS

TexasCapacitor

Electro Assemblies, Inc. Carborundum Clarostat

Cornell

The Daven

Delco Radio Div.ofG.M.Corp.

E.

Ine., Semico.nductor

Prod.

Div. Phoenix, Arizona

Electric Sales

Colman

Engineering

Co.

Glass

Eleetronic

Phoenix Diy. Phoenix,

Operations,

Bendix Aviation

Components

Corp.

Semiconductor

Electric Co. Fastener

Elec:tronicsSemiconductor

Mfg.

Dubilier Elec.

Co.

I. DuPont

and

Co.,

Cap.

Corp.

Inc.

Components

Co.

Corp.

and

Materials

Co.

Products

Co.

Hegeman

Operations

Systems

Mountain View,

Co.

Co••West.

Works

Mountain View,

Corp.

Mountain View,

Corp.

Div.ofC.8.S.

Co.

Corp.

Co.,

Corp.

New Bedford, Mass.

San Francisco,

ADDRESS

Colton,

New York, N.Y.

Boonton,

Div.

Marion, III.

Los

Angeles,.Calif.

Milwaukee, Wis.

Culver

City,

Div.

Dallas, Texas

Alliance,

Saugerties,

Palo Alto,

Chicago,

Div.

Somerville,

Dept.

Syracuse, N.Y.

Dayton,

EI

Monte,

Elect.

Hartford,

of

Corp.

Northlake, III.

Rockford, III.

Soquel,

Bridgeport,

Div.

Van

Nuys,CaHf.

Dept.

Bradford, Pa.

Los

Angeles,

Corp.

Boonton,

Los Angeles,

Inc.

Lowell, Mass.

Houston, Texas

Chicago,

Niagara

Dover,

So. Plainfield,

Livingston,

Kokomo, Ind.

Inc.

Wilmington,

Teterboro,

Calif.

N.J.

Calif. Calif.

Ohio

N.Y.

Calif

III.

N.J.

Calif.

Ohio

Calif.

Co.

Conn.

Calif.

Calif. Conn.

Calif. Calif. Calif.

N.J.

Ariz.'

Calif.

III.

Falls, N.Y.

N.H.

N.J. N.J.

Del. N.J.

CODE

NO.

MANUFACTURER

Thomas A. Edison Industries,

19500

19701 20183 21

21 21964

24446

2 4 455G.

24655

26462 2 6

28480

..

3 3113G.E.

35434 37942 39543

4 0 9 2 0 Miniature Precision Bearings, Inc.

42190

44655 48620

54294 55933 55938

56137 56289 61775

6 2 1 1 9 Universal Electric

64959 65092

7 0 1 , 9

70276

70309

70563 70903 70998 71002 71218

71286

71

7 1 71450

71468 71471 71482

71 7 1

7 1 71753 7 1

Div.

of

McGraw-Edison

Electra

Manufacturing Electronic Fansteel

520

The Fafnir Bearing

335

Fed.

General

Grobet

992

Hamilton

Hewlett-Packard

Leetrohm Inc. P.R.MalloryIeCo.,

Mechanical

Muter Ohmite Ptecision

Shallcross Mfg. Sonotone

Sorensonle Spaulding Sprague

Western Weston

31 3 400

590 700

744

785

'.9

8 4 Dow

7 7 2 1 3 6 Electro Motive Mfg.

Tube

Corp.

Metallurgical

Telephone

Electric

E.,

Lamp

Radio

File

Receiving Tube

Co.

Mfg.

Inst.

Co.

Union Switch

Div.ofWestinc;house

Electric

Inst. Div.ofDaystrom, Inc. Advance

Allen Mfg. Allied

Control Amperite Belden Mfg. B.ird

Electronic

Birnbach Radio

Bud

Radio Camloc AllenD.Cardwell

Prod•.

Corp

Bussmann Fuse Div.ofMcGraw-

Edison Chicago Cannon Cinema C.P.ClareIeCo. Centralab

The Cornish Chicago

A.O.Smith Cinch

Mfg.

Corning

Co.

and

Co.

Division

Nela

Co.

Co.ofAmerica,

Watch

Co.

Industries

Co.

Thermo",eter

Co.

Corp.

Co.,

Inc. So. Norwalk,

Fibre

Co.,

EIf!cfrie:

Co.

and

Signal,

Co.

Co.,

Electric

and

Co.

Co.,

Inc

Co.

Corp.

Co.

Inc.

Fastener

Corp.

Co.

Telephone

Electric

Co.

Engineering

Div.ofGlobe

Wire

Co.

Miniature

Corp.,

Corp.

Radio

Electronic

ADDRESS

Co.

West

Orange,

Co.

Kansas City, Mo. PhiladeJphia, Pa.

Corp.

No.

Chicago,

New Britain,

Corp.

Schenectady,

Park,

Cleveland,

West

Concord,Mass.

Inc.

Palo Alto,

Dept. Owensboro,

Inc.

Indianapolis,

Prod.

Co.

and

Philad..

Inc.

Tonawanda,

North

Brake

Air

Inc. New York, N.Y.

Relay

Co.

Inc.

Cleveland,

Sup.ply

Co.

Los

Co.

Union Inc.

Lamp

Works

Crowley Div.

West

Co.,

Inc.

Willimantic,

Conn.

Clifton,

Carlstadt,

Lancaster, Pa.

Chicago,

Akron,

Keene,

Chicago,

Skokie, III.

lphia,

Selma,

Elmsford, N.Y.

Adams,

Co.

Pittsburgh, Owosso, Mich.

Newark,

Burbank,

Hartford,

New York, N.Y. New York, N.Y.

Chicago,

New York, N.Y.

Paramus,

Plainville,

St. Louis, Mo.

Elkhart, Ind. Angeles, Burbank,

Chicago,

Milwaukee, Wis.

New York, N.Y.

Chicago,

Orange,

Chicago,

Midland,

III.

Pa.

III.

Pa.

IH.

III.

N.J.

Pa.

III.

III. Ohio Ohio

Ohio

00015-1

Revised: 10

Jan.

1961

From: F.S.C. Handbook Supplements

H4-1

Dated July 1960

H4-2 Dated July 1960

LIST

OF MANUFACTURERS

CONTINUED

CODe

NO.

MANUFACTURER

8 1

483

82042

8 2 1 7 0

822

09

822

1 9 Sylvania

8 2 3 7 6

International

Carter AllenB.DuMont Maguire

Electronic

Astron

Parts

Industries,

Electric

Co.

Rectifier

Co.

Tube

8 2389 Switc:hcraft, Inc. 8 2

647

Spencer

Thermostat,

Texas Instrurnents. Inc.

Resea.rch

82866

Vector

82893

Electro

83148

Victory

83186

Bendix

83298

8 3 5 9 4 .Burroughs·

83777

Model

Loyd

83821

Arco

84171

A.J.Glesener

84396

Good

84411

Sarkes

84970 85474

85660

Radio

86684

Cutler-Hammer,

88140 89473

General

90179 90970

9141

8

Products

Electronic:

Cords Engineering

Corp.,

Red Bank Div.

Corp.,

Electronic

R.M.Bracamonte&Co.

Koiled Kords, Inc. New

Electron

U.S.

Goods Bearing Radio

Tube

Eng.

and

Scru99s Electronics, Inc.

All

Electric

Tanian.

Corp.ofAmerica,

Tube

Electric

Rubber

Co.,

Div.

Engineering

Materials

ADDRESS

Corp.

EI

Se9undo,

Labs.•Inc.

Inc.

Prod.

Inc.,

Div.

Corp.

Co.

Corp.

Div.

Mfg.,

Inc.

Co.

Co.,

Inc.

San

Mfg.

Co.

Inc.

Div. Inc. Lincoln. III.

Distrib.uting

Mechanical

Co.

Greenwich.

Emporium,

East

Newark, Chicago.

of

Attleboro,

Madison.

Glendale,

Los

Angeles,

Red Bank,

Plainfield.

Huntington.

New

Francisco,

Ogallala,

Bloomington.

San

Francisco,

Haven,

RCA

Harrison.

Corp.

Schenectady,

San

Francisco,

Skokie,

Clifton,

Union,

Festus,

York. N.Y.

Passaic,

ChicaCjo, III.

Calif.

III.

N.J.

Conn.

Pa.

N.J.

III.

Mass.

Wis. Calif. Calif.

N.J.

Ind. Mo.

C~lif.

Neb.

Ind.

Calif.

Conn.

N.J.

N.Y.

N.J.

Calif.

CODE

NO.

91506 91637 91

662 91737 91929

93332

93410 93983

94144 94145 94154

94197 94310 95236

95238 95263

95265 95987 96067 96095 96296 96341 96501 97539

97966 981

98220 98291 98405

MANUFACTURER

Augat

Brothers, I

Dale

Products,

Elco

Corp.

Gremar

Mfg.

Micro-Switch Div.

Honeywell

Sylvania

Electric

Semiconductor

Stevens

Mfg.

Insuline-Van

Electronic

Raytheon

Tube

Div.

Raytheon

conductor Tung-Sol Curtiss-Wright

Tru

Ohm

Engineering Allies

Products

Continental

Leecraft National Weckesser Huggins

Hi-Q

DivisionofAerovox

Solar

Manufac:turing Microwave Excel

Transformer

Automatic

Mfg.

Co.

CBS

Electronics,

Div.ofC.B.S., Inc.

Axel Brothers Inc.

41

FrancisL.Mosley Sealectro Carad

Corp.

nco

Inc.

Co.,

of

Regulator

Prod.

Div.

Co.,

Norman

Division

Mf9.Co.•

Mfg.Co.•

Div.

Electric,

Corp.,

Prod.

Div.ofModel

and

Corp.

Connector

Mfg.

Co.,

Coil

Co.

Laboratories

Associates,

and

Precision

Corp.

Inc.

Minneapolis

Co.

Inc.,

Inc.

Ind.,

Receiving

Semi-

Inc.

Electronics

Mfg.

Co.

Corp.

Inc.

Co.

Inc.

Co.

New

Redwood

ADDRESS

Attleboro.

Columbus.

Philadelphia.

Wakefield.

Freeport.

Woburn.

Mansfield.

Inc.

Manchester,

Quincy,

Newton.

Newark.

Carlstadt.

Chicago,

Miami.

Woodside.

New

York, N.Y.

Sheridan.

Chicaqo.

Sunnyvale,

Olean.

Lus

Angeles,

Burlington.

Oakland,

Yonkers, N.Y.

Danvers. Mass.

Jamaica,

Pasadena.

Rocnelle, N.Y.

City,

Div.

Mass.

Neb.

Mass.

Ohio

N.H.

Mass.

N.J.

Fla.

N.Y.

Wyo.

Calif.

N.Y.

Calif.

Mass.

Calif.

N.Y.

Calif.

CODE

NO.

98734

98925

Pa.

99313 99800

III.

99848 99934 99957

THE

BER

THE

HANDBOOK.

0000

o

000

III.

o0 0 0 C

000

0 0

0000

o0 0 0 F

III.

o0 0 0 G o0 0 0 H Philco

0000

OOOOJTiTal, Inc.

o0

00

OOOOL

0000 0000

OOOOP

MANUFACTURER

Palo

Alto

Engineering

Co.•Inc.

Clevite

Transistor

Div.ofClevite

Varian

Associates

Delevan

Electronics

Wilco

Corporation Renbrandt. Technology

of

Calif.

FOLLOWING H·P ASSIGNED IN

FEDERAL

A B

Amp,

Chicago

Connor

Connex

SUPPLY

Inc.

Spring

Corp.

Prod.

Corp.

Inc.

Instruments

VENDORS

THE

LATEST

CODE

FOR

TelephoneofCalif.

Mfg.

Co.

e Fisher Switches. Inc. San

Malco

Tool

and

Microwave

Corp.

TubeDivision)

I Telefunken (c:/o

Elite)

K Transitron

Winchester

Western

Nt

Ind., Inc.

Nahm-Bros.

N

Ty-Car

Mfg.

Die Los

Engineering

(Lansdale

American

Electronic

Electronics,

Coil

Div.ofAutomatic

Spring

Co.,

Inc. HoHiston.

Sales

Co.

ADDRESS

Palo

Alto,

Waltham.

Palo

Alto,

East

Aurora,

Indianapolis,

Boston. Mass.

Corp.

No.

Hollywood.

HAVE NO SUPPLEMENT

MANUFACTURERS

Hawthorne.

S.

Pasadena',

San

Francisco.

Oakland.

Francisco,

Angeles,

Co.

Palo

Alto.

Lansdale.

New

York, N.Y.

Berkeley.

Corp. Wakefield,

Inc.

Santa

Monica,

Redwood

San

City,

Leandro.

Calif.

Mass.

Calif.

N.Y.

Ind.

Calif.

NUM·

TO

Calif. Calif.

Calif. Calif. Calif. Calif. Calif.

Pa.

Calif.

Mass.

Calif.

Calif. Calif.

Mass.

00015-1

Revised: 10

Jan.

1961

From:

F.S.C.

H4-1

H4-2

Handbook Dated Dated

Supplements

July 1960 July 1960

~

MANUAL

CHANGES

To

adapt

changes

Instrument

ALL

SERIALS

138149-

ERRATA:

this

manualtoinstruments

shownintables.

Serial

Prefix

Figure

4-5

Cha~gereference

4-8,

Table.· of

C205, 206: Change to

C335:

A R29:

Under

Man~l

p;...:~

with

Make

Manual

ERRATA 1

1,2

(sweep

Generator

designator

The

valueofR354

Replaceable

Parts~

capacitor,

rFi>

Stock

No. 0180-0076;

Changetocapacitor,

"

(§jJ

Stock

No. 0150-0024;

Change

rfi)J.

Stock

MISCELLANEOUS:

MODEL

).-;

OSCILLOSCOPE

Serial

Manual

other

Printed:

serial

Changes

schematic),

DStoreadI,i. shouldbe4440

fixed,

Mfr.

fixed

Mfr.

No.to0692-2235.

Fuseholder:

120A

Prefixed:

051-

1/61

prefixes

check

Instrument

e.,

DS201 to 1201, DS202to1202,

ohms.

.

electrolytic,

56289.

ceramic,.O.

91418. .

Change

rffjJ

for

Serial

20~,

02

Stock

errata

below,

Prefix

25 vdcw;

~,

±10%, 600 vdcw;

No. to

1400-0084.

and

Make

make

Manual

etc.

Changes

CHANGE 1

CHANG~

September

20

R119, 124:

R122:

2

Figure

PRIMARY

nSl230V

4-8

in

the

CONNECTIONS

115V

TableofReplaceable

T302:

1967

Changetoresistor,

<fp)

Stock

No. 0692-3635;

Changetoresistor,

~

Stock

No., 0686-2425;

(I..o~

Voltage

transformer

connections

Parts,

Change

to

transform~r,

and

fixed

fixed,

Filament

for

power;

composition,

Mfr.

01121.

composition,

Mfr.

01,121.

Supplies),

T302.

TERMINAL

5

6

7 8

9

10 11 12 13

14

15 16

17

18 19 20

rffJ

Stock

36,000

make

SECONDAR~

No. 9100-0158;

ohms

±5%,

2W;

2400

ohms

±5%,

1/2W;

the

following

changes

CONNECTIONS

SCHEMATIC WINDING

WIRE COLOR

Red-Yellow Red Yellow Yellow Orange Gray

Blue

Blue Green' Green White White Brown Brown Violet

White

Mfr.

450

5.0

2. 5

6. 3

6.3

27. 3

98734.

volts

volts volts· volts volts volts

SupplementAfor

rmsat150

rmsat2

rmsat115ma rmsat3. 3 rmsat3. 3

rmsat0..6

rmsat0.6

volts

rm"sat330 rna

120A-900

rna

amps

amps amps amps

amps

r$j)

MANUAL

CHANGES

To

adapt

this

changes shown·

Instrument

All

2753

to

5751

1952

to

2572

1752

to

1951

to

1151

1751

ERRATA:

manual to

Serial

in

tables.

Number

Manual :-3erial

instruments

with

Make Manual Changes

ERRATA

1

2

1,

3

2.

1. 2,

3,

4

the

reference

Des.

To

Old

1,

clarify

change

Ref.

A40DEL

OSCILLOSCOPE

other

serial

locations

New

designators

Ref.

120A

Prefixed:

prefixes

Instrument

951

551 451

351

of

the

Des.

051-

check

for

Serial

1150

to

950

to

550

to

450 350

to

1

multisection

as

follows:

Capacity

errata

Number

filter

below,

anc;l

make

Make Manual Changes

3'

,

2,

1,

2.

1. 1,

1.

1,2,3,4,5~6,7,8,9

Capacitor

3.

2,

3,

2,

3,

capacitors,

5

4,

4.

5.

4,

5,

4:.

:Marking

6

6,

7

8

7,

CHANGE

to

CI7A,B

C17C

C17D

C322A

C322B

C328A

C328B

0.1

J.Lf,

(j)S,tock No.

C17

..

C300

C326

C322 C324

C328

C331

C321

1

C329:

C330:

Delete

Change

2

X20

20p.1

20

fJ.1

120

J,1£

40

~l

120

40fJ.£

0160-0013.

fJ.£

~f

Cover

6

.6.

NO

~R~

Com.

Neg.

a

ICom~

Neg.

o

c::J

Com

NA{!'

(over)

6/27/62

SupplementBfor

120A-900

A~ual

Changes Model 120A

Page

2

Instrument

All

to

2753 1952

to

1752

to

1151

to

CIIANGE

Serial

5751

2572

1951

1751

1··

(cont.)

Number

1 1,

1,

R228: R249:

8202:

Make

"Manual Changes

ERRATA

2

3

2, 2,

3,

Change

.

4-

to

portion

...

10K

270K

ohms,

of

R209

lOOK

Instrument

to

951

551

to to

451

351

to

1

tb

Stock

'~Stock

8202

circuit

Serial

1150

950

550

450

350

No.

2100-0167.

No.

containing

Number

0686-2745.

Make Manual Changes

1,2,3,4,5-

1,2,3,4,5,6, 1,2,3,4,5,6,7

1,2,3,4,5f6,7,8

1,2,3,4.5,6,?~8,9

R210

to

the

following:

CHANGE

6/27/62

2

3

4

R121:':

Add R326.:

ClIO:

elll:

5

6

L301,

R254:

Add

Add DS300:"

V306:

R327:

troul

D8208:

Change

150K

Change Change

Chang"e

,R25S'

8

and

3 and

Change

value

to to

Delete

to to

1/25W

to

6.8K

ohms

(same

50

to.

680

12M,

R257

9,_

2.

type

38Q

pt,

anp~replace

'q!J

Stock

rotor,

neon

lamp,

neon

lamp,

5Y3'

ohms.

as

R302),

pi',

~Stock

~,-"~

No.

$

Stock

@

Stock

tube.

in

parallel

Stock No.

No.

0140-0007.

withawire

·0730-0145.

No

.2140-0008,

No.

2140-0008,.

with

0131-0001.

jumper.

Change

R302.

connection

between

V205,

VaOl,

Manual

Changes

Model

120A

Page:3

Instrument

All

2753

to

1952 1752

to

1151

to

CHANGE

Serial

5751

2572 1951 1751

7

8

9

Number Make Manual Changes

ERRATA

1

2

1.

2,

Delete

Change

Delete

Change

3

4

3,

and

replace

to

1,500

to

5.6M,

to

3.5M,

to

470K

to

10

to to

~r,

50

to

3000obms,

1,

C218:

R200:

R223:

R309:

R312: R313:

C204: C225:

C2:37:

R204:

Instrument

951

.to

to

551

451

to

351

to to

1

wij.,tlwire

ohms,f(!j3JStock No.

~Stock

~

Sto~

ohms,

.~

380

f!!b

Stock

pf,

$

No.

Stock

~o

~

Stock

0693-5651. 2100-0172.

~

Stock

Serial

Number Make Manual Changes

1150

950

550

450

350

jumper.

0730-0017.

No.

0687-4741.

0140-0002.

No.

0131-0001.

No.

0686-3025.

1,,2.3.4.5 1,2,3,4,5,6

1.2.3.4.5.6.7 1,2,3,4,5,6,7,8

1,2,3,4,5,6,7,8,9

6/27/62

HP 120A, 120AR Service and user manual

Specifications and Main Features

Frequently Asked Questions

User Manual