HP 152A, 150A Service manual

OSClllOSCOPE

OPERATING

AND

SERVICING MANUAL

OPERATING AND SERVICING MANUAL

FOR

MODEL 150A

HIGH

FREQUENCY OSCILLOSCOPE

Serial

1190

and

Above

And

MODEL 152A

DUAL TRACE AMPLIFIER

Serial

1086

and

Above

,

275

PAGE MILL ROAD,

Copyright

HE

WLET T-PACKARD COMPANY

1956

by Hewlett-Packard Company

The information contained in this booklet i3 intended for the operation and maintenance of Hewlett-Packard equipment and is not to be used otherwise or reproduced without the writtenconsent Packard Company.

PAL0

of

the Hewlett-

ALTO,

CALIFORNIA, U.S.A.

'

15OAOO1-1

INTERNAL SWEEP:

MAGNIFICAT ION:

SYNCHRONIZATION:

SYNC CONTROL:

150A SPECIFICATIONS

SWEEP GENERATOR

24

calibrated ranges provide sweep speeds from 0.1

psec/cm to 5 sec/cm; accurate to within

A vernier control provides continuous adjustment of sweep speed between calibrated ranges and extends slowest sweep to 15 sec/cm.

5 calibrated ranges, X1, X5, X10, X50 and XlOO magni-

fies center portion of unmagnified trace; increases fastest sweep speed to

magnification and ranges retain accuracy of original sweep.

Internal, from line power or vertical input signal which causes 1/2 cm or more vertical deflection. External,

either capacitive or direct coupled with 1/2V p-p or more.

Sweep can be triggered from either

negative going voltage; the triggering voltage level of external sync signals

-30

to

+30

volts.

Switch position automatically provides optimum sync

stability for majority of uses.

2p

.02

XlOO

is

psec/cm except lp X50

magnification. X1 and X5

continuously adjustable from

39%.

a

positive- or

a

SINGLE SWEEP: SAWTOOTH OUTPUT:

GATE OUTPUT:

BAND WIDTH:

.

SENSITIVITY:

INPUT IMPEDANCE:

OUTPUT:

Switch in top access provides single-sweep operation. +20

to

-20

volt sawtooth output available from connec-

tor in top access.

20-volt positive pulse for duration of sweep available

from connector in top access.

HORIZONTAL AMPLIFIER

Direct current to 500 kilocycles.

5 calibrated ranges provide sensitivities from

volt/cm to 5 volts/cm. A vernier control provides

continuous adjustment between calibrated ranges and extends the minimum sensitivity to 15 volts/cm.

1 megohm shunted by

CALIBRATOR

1000-cycle square wave having 1-psec rise and decay time available

18 calibrated ranges provide from volts peak-to-peak, accurate to within

at

40

pfl.

front-panel connector

0.2

.

millivolt to 100

370.

0.2

I

,

I

,

!

t

I

!

TYPE:

CATHODE RAY TUBE

5 AMP-

P1,

potential

rr-cno-accelerator,

P2,

P7

.

or P11 screen. 5000-volt accelerating

flat face, available with

\

I

i

I

1

I

DEFLECTION PLATE CONNECTIONS:

INTENSITY MODULATION:

REPLACEABILITY:

POWER REQUIREMENTS:

SIZE: WEIGHT:

BANDWIDTH:

SENSITIVITY:

Both screw and pin-type terminals in top access re-

or

ceive wires tion to plates.

Terminals inside top access to receive +20 pulse for blanking CRT trace of normal intensity.

CRT bezel removes with graticule or CRT from the front panel.

CRT bezel provides firm mounting for standard oscilloscope cameras

115/230 VAC watts.

13-1/2" wide Net weight

@l52 DUAL TRACE AMPLIFIER

Direct Current to microsecond.

9

calibrated ranges provide sensitivities from

20 volt/cm, 57'0. Vernier control provides continuous adjustment between calibrated ranges and extends the minimum sensitivity to 50 volts /cm.

special connector assembly for connec-

.

+lo%,

x

17-1/411

80

pounds; shipping weight

50/60

high x 25" deep.

10

megacycles; rise time 0.035

150

twist for replacement of

cycles, approximately500

104

pounds.

0.05

to

INPUT IMPEDANCE:

I

,

1

I

i

DUAL TRACE PRESENTATIONS

1'

i

!

I

i

I

i

I

1

megohm shunted by

Simultaneous traces obtained either by alternate sweep

or

ing

ping lines between traces are blanked.

Channels are completely independent and have identical operating controls

Pos-Up-Pos Down switch provided.

by 100-kilocycle chopping,

40

.

ppf

each channel.

as

selected. Chop-

TABLE OF CONTENTS

FOR

MODEL 150A AND MODEL 152A

HIGH FREQUENCY OSCILLOSCOPES

Par

1-1 1-2 1-3 1 -4 1-5 1-6

2-1 2 -2 2-2A 2-2B 2-2c

2-2D 2-2E 2-3 2 -4 2-5

3-1 3-2 3 -3 3 -4 3-5

3-6 3-7 3-8

-9

3 3-10

3-1 1 3-12 3-13

4-1

a

.

SECTION

GENERAL DESCRIPTION

General Information. Damage Power Line Voltages Power Cord Cooling Overload Relay

OPERATING INSTRUCTIONS

High Voltage Time Delay Controls and Terminals Internal Sweep Controls Horizontal Input Controls. Dual Channel Amplifier Controls CRT Panel Controls Top Access Controls Operating Procedures

'Vertical

Use of Chopped or Alternate Sweep

THEORY

General Content Overall Operation Synchronizing Circuit Sweep Generator Feedback Integrator and

Diode Switch Schmitt Trigger Circuit Horizontal Amplifier.

Main Vertical Amplifier Model 152 Dual Trace

Amplifier Plug-In Unit Calibrator Regulated Low-Voltage Power Supply Re gulate d High-Volt age Power Supply Single Sweep and Delayed Sweep Operation

Introductory

in

Transit

.

. . . . . .

.

. . . .

. .

SECTION I1

. . .

AC

.

. .

or DC Coupling

. . . . .

SECTION

OF

111

OPERATION

. . .

. .

. . . . . . . .

.

. . . . . . .

. . .

SECTION IV

MAINTENANCE

. . . . . . .

I

. .

. . .

.

. .

.

. .

.

. . .

. .

. . .

. . . .

. . .

. .

.

. .

.

. .

.

. .

.

Page

1-1 1-1 1-1 1-1 1-1 1-1

2-1 2-1 2-1 2 -2

2-2 2-3 2-3 2-3 2-3

2 -4

3-1 3-1 3-3 3-5

3-6 3-7 3-7 3-8

-9

3 3-1

3-1 1 3-13 3-13

4-1

Para.

4-2 4-3

-4

4 4-5

4-6 4-7

4-8

4-9 4-10 4-11

4-12

4-12A

4-12B XlOO Magnification

4-12C X5 to XlOO Magnification

4- 12D Main Horizontal Amplifier

4-13 Adjusting the Ext. Horiz. 4- 13A Horiz . Balance 4-13B Ext. Horiz. Input 4-13C Ext. Horiz. Input

4-14 Adjusting the Sync Circuit 4-15 Adjusting the Preset Sensi-

4-16 Calibrating the Sweep 4- 16A Sweep Amplitude

1

4-17 Adjusting Gain and Fre-

4-18 Adjusting Model 152A 4-18A Vertical Centering 4- 18B Neutralizing Adjustments

4-18C Output Frequency

Replacing the Air Filter Removing the Cabinet Connecting for 230-Volt Power Lines Servicing Etched Circuits Tube Replacement Chart Isolating Troubles to Major Sections Adjusting the Low-Voltage Power Supplies Adjusting the High-Voltage Power Supply Replacing and Adjusting theCRT Adjusting the Calibrator

Adjusting the Main Horizontal Amplifier. Main Horizontal Gain Adjustment

Calibration Centering and X1 Centering. Frequency Response

Adjustment Input Preamplifier. Adjustment. Volts/CM Calibration

tivity of the Sweep Generator

Generator Adjustment quency Response

Vertical Amplifier Trace Amplifier. Adjustments

Response Adjustment

. . . .

. . . . .

.

. . . . . .

.

. . . . . .

.

. . . . .

.

. . .

.

. .

. . .

.

. .

. . .

.

. . . .

. . .

. .

.

. .

.

. . . . .

of

Main

. . .

Dual

. . . .

. .

.

. .

.

. .

.

. .

.

. .

.

Page

1

44-1

4-1 4- 1 4-3

4-3 4-3

4-9 4-9

4-11 4-11 4-11 4-13 4-13

4-14

4-15 4-15 4- 15

4-17 4-17

4-18

4-

18

4-18

4-21 4-2 1 4-21

4-21 4-23

1-1

GENERAL INFORMATION

SECTION

I

GENERAL DESCRIPTION

1-4

POWER CORD

The Model 150A dc to 10 MC oscilloscope

a

general purpose oscilloscope employing

5-AMP mono-accelerator type cathode ray tube, with unitized, plug-in construction for maximum accessibility and flexibility. It

can be used with either internal or external

sweeps which can be either internally or externally synchronized. The horizontal amplifier incorporates magnification circuitry

is

which sweeps up sweep range extends from .02 bsec/cm to 15 sec/cm.

The Model 150A has been designed for use

with units to perform many different functions but for the purpose of explaining scope operation in this manual, the Model 152A Dual Channel Amplifier employed, Since the control layout on the front panel has been carefully organized and labeled for convenient operation, most controls will be self-explanatory. However major controls will be discussed completely in the operating section of the manual. A large fold outview of the panel Section I1 with

s

cr ibed

capable of expanding basic internal

to

100 times. Thus the internal

a

variety of vertical amplifier plug-in

it

will be assumed that

is

included in

all

operating controls de-

.

is

The three conductor power cable supplied

withthe instrument

a

ized three prong male connector recommend-

ed by the National Electrical Manufacturers'

Association. The third contact

round pin added to plug which grounds the instrument chassis when used with the appropriate receptacle.

To use this plug in outlet an adapter should be used to connect the NEMA plug to the two contact system. When the adapter tion becomes

which can be connected to the outlet mounting box for the protection of operating personnel.

,

1-5

COOLING

The Modell5OA employs a forced draft cooling system to maintain satisfactory operating

temperatures within the case. The

and

air

filter

case, and adequate cooling will take place

,

long

as

the case ing obstructs the filter. Generally, the height of the cabinet feet provide such clearance.

Thus the Model150A can be used in fined bench set-up of the cabinet tures are not extreme.

is

terminated in a polar-

is

a

standard two-blade ac

a

standard two contact

is

used the ground connec-

a

short lead from the adapter

located under the instrument

is

on the instrument and noth-

as

long

as

the underside

clear, and ambient tempera-

an offset,

air

intake

as

a

con-

1-2

DAMAGE IN TRANSIT

After unpacking this instrument should any The Model shipping damage become evident, refer to the reduces the output voltages 1lClaim for Damage in Shipment" paragraph ply when: on the warranty sheet in this manual.

1-3

POWER LINE VOLTAGES

The Oscilloscope, like other @ instruments, is

shippedfrom thefactory wiredfor 115 volt ac line operation unless otherwise specified in the order. However, the instrument may

also be operated from a 230 volt ac line source if

the proper conversion

transformer. This conversion

is

described in the Maintenance section.

is

made to the power

is

simple, and

1-6

OVERLOAD RELAY

150A

1.

)

Any series tube on the d'-c heater string

strument

2.)

A plug-in vertical amplifier removed while the instrument

is

on.

3.)

A short circuit or excessive loading of any positive-voltage supply occurs.

has an overload-relay which

is

removed while the in-

is

on.

1-1

of

the power

SUP-

is

i

SECTION

OPERATING INSTRUCTIONS

2-1

HIGH VOLTAGE TIME DELAY

The Model 150A applies voltage only to

tube filaments for about

it

turn warm up before tube plate voltages and CRT high voltages are applied.

is

recycle before the instrument returns to operation.

2-2

The front panel arrangement and operating controls are shown in the fold out illustration, Figure 2-1. The description of the operating controls should enable you to operate the instrument of oscilloscope technique. However,

plete description of control function follows:

on. This delay provides an adequate

turned off for any reason this delay will

CONTROLS AND TERMINALS

if

you have a basic knowledge

30

seconds after you

If

the instrument

2-ZA INTERNAL SWEEP CONTROLS

SWEEP TIME/CM

Amulti-position switchwhich selects any one of twenty four calibrated sweep speeds from

0.1 pec/cm to5 sec/cm. This switchis sociated with a concentric VERNIER which

provides continuous adjustment of sweep

speed between steps, and in the full counterclockwise position extends the sweep time to

is

15 sec/cm. When the VERNIER

clockwise position (GAL),

cuit and the sweep time

k370

as

read

on

the SWEEP TIME/CM dial.

INT. SWEEP MAGNIFICATION Afive position magnification control, X10, X50, and X100. The Xlposition provides calibrated sweep speeds TIME /CM switch. Other positions indicate degree of expansion taking place about the

vertical centerline on the scope graticule. Whenever the sweep the SWEEP MAGNIFIED lamp will light. The fastest calibrated sweep time of

is

obtained by setting the SWEEP TIME/CM

switch to

.1

or

.2

psec/cm and setting the

it

is

calibrated within

as

read onthe SWEEP

is

magnified beyond X1

in the full

out of the cir-

0.02

pec/cm

a

X1,

its

com-

as-

X5,

II

magnifier on X5 or exceed the fastest calibrated sweep time, the MAGNIFIER UNCALIBRATED reminder lamp will light. It will also light with 1 psec/cm X50 and 2 psec/cm X100.

SYNC Afour position switch which enables the sweep to be triggered either internally or externally. Internal triggering can be accomplished

a

from applied vertical input signal of sufficient amplitude to produce nal triggering can be effected by signals having amplitudes greater than the low frequency cut sync input circuit it low frequency sync signals. Concentric with the SYNC switch

SWEEP MCDE

A

bias of the sweep generator. As the control

is

tion, the sweep generator will pass from

free running (FREE) condition to a condition where triggering the extreme counterclockwise position the

control switches into

PRESET provides optimum triggering bias for nearly

TRIGGER LEVEL A continuous control which selects the ampli-

tude level of the sync signal where trigger-

ing occurs. For external synchronizing sig-

nals therange of this controlis from

-30

at

complex waveforms. See Figure 2-2.

TRIGGER SLOPE A two position switch concentric with TRIGGER LEVELwhich permits triggering to occur on either the positive of internal, external or line voltage sync signals. See Figure 2-2.

EXT

A

which are connected in parallel and receive

external synchronizing signals.

line voltage signal or (INT) from an

is

advisable to use

continuous control which adjusts the input

rotated from the extreme clockwise posi-

all

sync applications.

volts, allowing the sweep to be triggered

any point within this range on simple or

SYNC

pair of binding posts and a BNC connector

INPUT

X1O

respectively. If you

a

5mm deflection. Exter-

0.

5 volt. Since

off

of the ac coupled

is

approximately 200 cps,

EXT

DC for external

is

the SWEEP MODE control.

is

required (TRIGGER). At

a

PRESET position.

or

negative slope

+30

to

a

2-1

2-2C

DUAL

VERTICAL PRESENTATION A four position switch which selects the desired vertical channel or desired dual channel presentation.

CHANNEL AMPLIFIER CONTROLS

This switch

is

labeled:

FIGURE 2-2

2-2B

HORIZONTAL INPUT CONTROLS

EXT HORIZONTAL INPUT

a

A pair of binding posts and which are connected in parallel and receive externally applied sweeping signals to drive the horizontal amplifier. The amplifier pass

is

band

from dc to

500

KC.

BNC connector

A ONLY

B ONLY

ALTERNATE

CHOPPED

POLARITY

A four position switch which allows the input

signal polarity to be displayed either up or

down on the scope, and which selects either AC or

VERTICAL POSITION

A continuously adjustable control, concentric with POLARITY, which adjusts the vertical position of the input signal. One for each

channel.

DC

The output of the A channel applied to the vertical amplifier.

The output of the B channel applied to the vertical ampli-

fier.

The two channels are alter-

at

nated paragraph 2-5.

The two channels

at

a

KC.

composed of five microsecond segments spaced five microseconds apart. See paragraph 2-5.

coupling. One for each channel.

the sweep rate. See

are

switched

free running rate

The

two

traces are each

of

100

is

EXT INPUT VOLTS/CM A five position attenuator calibrated from .2 volts/cm to 5 volts/cm which establishes the input

This switch VERNIER which provides continuous ad just ment between steps and reduces the input sensitivity to 15 volts /cm in the full counterclockwise position. When the VERNIER

the full clockwise (CAL) position, the circuit and the VOLTS/CM switch brated with

HORIZONTAL POSITION

A multi-turn control which changes the horiz-

ontalpositionof the trace. It covers the range

in several turns to let you make fine adjustments under high magnifications of an internal sweep.

sensitivity of the horizontal amplifier.

is

associated with a concentric

is

it

is

out of

is

cali-

+30/0.

in

VOLTS /CM A nine step attenuator which selects the input

sensitivity of the vertical amplifier.

tivities range from. 05 trolts/cm to 20 volts/

a

cm in

-

VERNIER

‘CM

for each channel.

A-BAL and B-BAL Screwdriver adjustments for adjusting the dc balance of each vertical amplifier. ure

A-CAL and B-CAL Screwdriver adjustments for setting the gain of each vertical amplifier.

2-2

5-1-2 sequence.

is

in the CAL position the VOLTS/

attenuator is calibrated within

2-11.

Whenthe concentric

Sensi-

+3oJO.

One

See Fig-

2-2D

CRT PANEL CONTROLS

FOCUS

01s

Contr

trace resolution,

RESET A terminal which can receive an external pulse to rearm the single sweep circuit. Pulse

characteristics required

peakwithno overshoot;

=

+15 to +25 volts

2

to 4 pseconds width.

INTENSITY Controls trace brightness.

SCALE LIGHT Adjusts brightness of graticule lines.

CALIBRATOR

a

at

1000

the

rise

A multi-position switch which adjusts

cps square wave from 0.2 millivolts to 100

volts in

+3

of adjacent terminal and can be used to calibrate the deflection sensitivity of the vertical and horizontal amplifier and decay times are each less than 1 micro-

second. The square wave output may also be

used to adjust the divider probe for frequency

response.

a

2-5-10 sequence with an accuracy

70.

The output voltage appears

.

Square wave

2-2E TOP ACCESS CONTROLS

The following controls and terminals are accessible through the top access door of the instrument cabinet.

Horizontal and vertical deflection plates.

A terminal for CRT intensity (Z-axis) modulation

FUSE

Line fuse Thermal cutout with resetting button.

2-3

OPERATING PROCEDURES

Basic operating procedures are described by illustrations

steps in eachcase. The

are complete. Others are arranged to supplement the tions possible in using the oscilloscope. index to these illustrations follows:

FIG.

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

2-7

2

-8

2

-9

2-10 2-1 1

2-12 2-13 2-14 2-15 2-16 2-17

(Fl)

6-1/4 amp slo-blo.

which are keyed to procedural

first

twoprocedures

first

two by showing the varia-

TITLE

Internal Sweep Internal Sweep Internal Sweep Magnification External Horizontal Input

Vertical Input Adjusting Divider Probe Removing CRT Bezel Aligning Scope Trace with Graticule Vertical Balance Adjustment

Direct Connection to

Capacitive Coupling to CRT Plates Single Sweep Operation

Delayed Sweep Operation

Vertical VOLTS /CM Calibration

External Intensity Modulation

--

Internal Sync

--

External Sync

--

Dual Trace

CRT

Plates

An

SAWTOOTH OUT

A terminal which provides voltage corresponding to the sweep.

GATE OUT A terminal which provides voltage for the duration of the sweep.

SINGLE-NORMAL A switch which selects either normal or sin-

gle sweep operation. In single sweep posi-

tion the circuits are arrangedto sweep once

a

after tive until manually or

The ARMED lamp lights when the single sweep circuit

trigger signal and then remain inopera-

is

ready for a trigger.

a

sawtooth output

a

positive gate

electronically reset.

2-4

VERTICAL AC OR DC COUPLING

Under most conditions AC coupling will be used.

without regard for the dc levels involved. In

the AC position the input signal (vertical or

external sync)

through

component from the input wave. This coup-

ling circuit has

cps; however, to avoid degrading input pulses or square waves below 10 cps to use dc coupling.

When you want to look to

rundown in circuit work, or in mechanical work where the output from

a

It permits high gain to be employed

is

coupled to the instrument

a

capacitor which removes the dc

a

low frequency cut off

it

is

advisable

at

waveforms relative

a

dc level; for example, observing a Miller

a

transducer has

dc component; use dc coupling.

2-3

at

2

2-5

USE

OF

CHOPPED

OR

ALTERNATE SWEEP

CHOPPED and ALTERNATE VERTICAL PRG

two

SENTATIONare used topresent

electrical phenomona, which are related in

frequency or rate of recurrence, to the

cilloscope CRT for simultaneous viewing. ALTERNATE may be used whenever sweep time and rate of recurrence are rapid enough

is

and screenpersistence vent objectionable flicker. CHOPPED PRESENTATION should be used NATE position

on the screen as the inputs are switched after

a

flickering effect

long enoughto pre-

if,

separate

os-

in the ALTER-

is

noticeable

each sweep. When two related signals are

being presented to the oscilloscope for

multaneous viewing using either CHOPPED or ALTERNATE VERTICAL PRESENTATION the 150A should be synchronized externally.

Insome cases different input waves not related infrequency. In this instance the 150A may be synchronized internally, triggering automatically one signal then from the other

is

dure may cause noticeable deterioration of the

quality may be improved byadjusting the VERTICAL POSITION controls

not ordinarily recommended since

of

it

may be desirable to view two

first

.

This proce-

the presentation. Quality generally

so

that the traces overlap.

si-

from

it

2-4

INTERNAL SWEEP - INTERNAL SYNCHRONIZATION

-0-

I

1.

Place vertical input signal into plug-in am-

plifier.

2.

If dual trace amplifier CAL PRESENTATION selector to put; assume one input is used.

3

.

Adjust VOLTS/CM selector for desired sensitiv it

y

.

4.

Set SYNC selector to INT.

is

used, set VERTI-

A

or

B

in-

FIGURE

5.

Set HORIZONTAL SENSITIVITY to INT

x1.

6.

Select desired sweep speed.

7.

Set TRIGGER LEVEL to zero.

8.

Set TRIGGER SLOPE for triggering on positive or negative slope sired.

9.

Set SWEEP MODE to PRESET.

2-3

of

input wave

SWEEP:

as

de-

INTERNAL SWEEP - EXTERNAL SYNCHRONIZATION

1.

Place vertical input signal into plug-in am-

plifier.

2.

If dual trace amplifier

CALPRESENTATION switch toproper input.

Assume one input

3

.

Place sync signal into EXT SYNC INPUT terminals

4.

Place HORIZ SENSITIVITY to INT SWEEP X1.

.

is

used (A or

used, set VERTI-

B).

FIGURE

5.

Select desired sweep speed with SWEEPTIME/CM switch.

6.

Set TRIGGER LEVEL to zero.

7.

Adjust SYNC selector to AC or DC quired (see paragraph

8.

Place SWEEP MODE in PRESET.

2-4

2-4).

as

re-

INTERNAL SWEEP MAGNIFICATION

I

1.

Select sweep speed with SWEEP TIME/CM switch.

Place

2. of SWEEP TIME/CM switch

3.

Set HORIZ SENSITIVITY to INT SWEEP X1 (X1

4.

Adjust horizontal position of want ticular wave in

nification. UNCAL lamp stays off)

VERNIER in CAL when direct reading

is

the unmagnified sweep position).

to

magnify a portionof a wave or a par-

a

train, place wave

SWEEP TIME/CM MAGNIFICATION

Actual sweeptime/cm=

.

Olpsec / cm;uncalibr ated lamp will light. In-

crease sweep time or reduce degree of mag-

=

is

desired.

of

G

If you

inter-

X50=

trace.

.5 psec/CM

X50 MAGNIFICATION

psec/cm

.5

est under vertical graticule center line with HORIZ POSITION control.

5. Switch HORIZ SENSITIVITY to desired magnification (X5 or above).

6.

SWEEP MAGNIFIED indicator will light.

7.

If

combination of sweep magnification exceeds maximum calibrated sweep speed FIER UNCALIBRATED indicator will light.

SWEEP TIME/CM

Actual Sweep Time

(Sweep

time

>

.02pec/CM,MAGNIFIER

speed and degree of

(.02

peconds/cm) the MAGNI-

=

.5 psec/CM

=

X10

=

.5 psec/CM $(XlO)

=

.05

psec/CM

FIGURE

2-5

EXTERNAL HORIZONTAL INPUT

(if

VLINILI

1.

Insert external horizontal signal.

2.

Select desired

side

of

HORIZONTAL SENSITIVITY control,

sensitivity

on

EXT

INPUT

FIGURE

3.

Adjust horizontal position.

4.

Turn SYNC selector to an EXT position.

5.

For vertical input see Figures

2-3

2-6

and

2-4.

VERTICAL INPUT - DUAL TRACE

1.

Set to A only.

2.

Place one of two input signals intoINPUT A.

3.

Adjust deflection sensitivity with VOLTS /CM

switch. When VERNIER reads CAL, accuracy of VOLTS/CM switch

4.

Select polarity of presentation.

negative or positive portion of input wave

displayed up or down.)

is

+3%.

(

Whether

is

FIGURE

Adjust vertical position of trace near upper

(or lower) portion of scope face.

5.

Switch to INPUT B and repeat above procedure on

6.

Switch to ALTERNATE or CHOPPED for dual trace presentation.

B

side of panel.

(See paragraph

2-7

2-5.

)

..

Connect theAC-21AProbe to the desired ver-

lo

tical input, and set the VERTICAL PRESENTATION selector to the corresponding input.

Set the CALIBRATOR selector to

2.

vertical VOLTS/CM selector to Set the SWEEP TIME/CM selector to. 5 MIL-

3.

2.

.05.

LISECOND/CM; set the SYNC selector to INT, the SYNC control to PRESET.

Touch the probe to the CALIBRATOR connector

4.

and observe the 1-kc square wave.

I

Set the

.-

Loasen probe locknut by unscrewing.

5.

Tune probe to obtain flattest top on square

6.

wave by turning rear flange Tighten locknut to retain adjustmenti

7.

on

probe.

t:

/

II

'

FIGURE

2-8

REMOVING CRT BEZEL

LOCK

RELEA

The CRT bezel contains the filter and graticule shields; cept oscilloscope camera equipment without

adapters of any kind.

cathode ray tubes the bezel must be removed,

it

has also been designed to ac-

To

change filters or

FIGURE

To

remove bezel:

1

.

Depress lock release button, and twist bezel

counter clockwise about 15 degrees

2.

Pull bezel straight from panel

2-9

.

as

shown.

ALIGNING SCOPE TRACE

WITH

GRATICULE

Alignment complished through access hatch without removing instrument from case.

of

CRT

with graticule may be ac-

FIGURE

(2)

Fiber lever

itudinal positioning clamp

(l),

controls both radial and

using screwdriver.

2-10

of

CRT

and

is

locked by

long-

VERTICAL BALANCE ADJUSTMENT

Procedure given for B channel, but

A

for

1. Set SWEEP MODE control to FREE RUN.

2

channel.

.

Set VERNIER to minimum (full counterclock

.

wise)

is

same

FIGURE

3

.

Center trace with VERTICAL POSITION control.

4.

Switch VERNIER to

5.

Adjust B-BAL control to return trace to

center of scope.

2

Repeat steps

2-11

to 5 until trace remains centered.

CAL

(full clockwise).

DIRECT CONNECTION

//

EXTERNAL INPUT SIGNAL

I

TO

DEFLECTION

PLATES

'R282

IM

CAUTION

oscilloscope operate

approximately +250 volts. Therefore there canbe no commonchassis connection between

the signal source and the oscilloscope. In

most cases the signal source chassis assume the deflection plate potential. Turn off the to deflection plate terminals.

To connect an external signal directly to ver tical deflection plates:

A. Balanced Input

1,Connect signal to terminals A and

-

The deflection plates of the

at

a

d-c potential of

will

'

instrument before making connection

,

E.

FIGURE

-

2.Relocate leads from as shown by dashed lines.

B.

Single-Ended Input

1.Connect the signal to A for + up deflection (to E for + down deflection).

2.

Connect an appropriate bypass capacitor betweenC and (between C and Afor Signal source return connects to A, whichever is bypassed.

3.

Relocate leads from

as

shown by dashed lines.

2-12

F,

I,

D3

E

for t up deflection

+

down deflection).

F,

I,

D3

and

E

D4

or

D4

CAPACITIVE CONNECTION

EXTERNAL

INPUT

SIGNAL^

.

(SINGLE-

/

TO

DEFLECTION

-R282

IM

PLATES

CAUTION

-

Turn off instrument before making connection to deflection plate terminals.

ac

couple a signal to the vertical deflection

To

plate

:

A. Single-Ended Input

1.

Connect external signal to B for t up deflection (to D for and the signal return to

2.

Connect an appropriate bypass capaci-

tor betweenC and E for

t

down deflection)

C.

t

up deflection

(between C and Afor t down deflection).

3. Connect an appropriate d-c blocking

FIGURE

capacitor betweenA and B for flection (between D and

deflection).

F,

4.Relocate leads from

as

shown by dashed lines.

I,

B. Balanced Input

1.

Connect external balanced signal to minals B and D.

2.

Connect appropriate d-c blocking pacitors between terminals A and B and between terminals

3.Relocate leads from

as

shown

by dashed lines.

D and

F,

I,

2-13

t

E

up de-

for t down

D3, and D4

E.

D3, and D4

ter-

ca-

SINGLE SWEEP OPERATION

PP

THERMAL OVERLOAD SWITCH

(MANUAL RESET

1

1.

Set selector inside top access to SINGLE.

2.

Select sweep speed.

3.

Set SYNC switch to INT. and SWEEP MODE MODE control

to PRESET.

4.

Select desired vertical sensitivity.

5.

Adjust TRIGGER LEVEL to ZERO and

SLOPE

it

TRIGGER LEVEL in NORMAL operation.)

as

may be convenient to establish desired

desired.

(In

some applications

FIGURE

6.

Switch SWEEP MODE control out ofPRESET and back to PRESET to arm sweep

circuit

7.

Indicator should light When input signal

fire

once, indicator

and sweep will remain locked out until re-

set

as described in step

8.

Resetting can be accomplished by placing

1-4

pec

into RES ET terminal

2-14

.

width,

as

soon

as

is

returned to PRESET.

is

received, sweep will

(7)

will extinguish,

6.,

or

t15

to

t25

volt peak pulse

.

SWEEP

4

DELAYED SWEEP OPERATION

D

OUTPUT

DELAY GENERATOR

-hp-

2

OR

I2

INPUT

J3

1.

Set selector inside top access to NORMAL.

2.

Select sweep speed.

3.

Set SYNC switch to INT and SWEEP MODE to PRESET.

4.

Select desired vertical sensitivity.

5.

Adjust TRIGGER LEVEL and SLOPE for desired triggering.

6.

Switch selector to SINGLE.

7.

Connect output of DELAY GENERATOR to RESET terminal inside top

access.

8.

Connect signal to be observed to scope in-

(Channel A or

put.

9.

Connect trigger source to input of delay generator. Trigger-source signal in some applications may be same observed(step signal. This signal serves sweep retriggering source. (See SINGLE

SWEEP OPERATION.

10.

It may be desired to have the sweep immediately of awaiting the arrival of signal to be observed.

1 through

SWEEP MODE control to FREE RUN.

at

To

accomplish this, follow steps

9,

except that after step

8)

end

B

as

desired.)

as

or

it

may be some other

)

of

delayperiod instead

signal

as

a

to

be

single

start

6,

set

FIGURE

2-

15

VERTICAL VOLTS/CM CALIBRATION

This procedure assumes that vertical . alance

adjustments (Figure 2- 11) have been made.

1.

Connect CALIBRATOR output (or any accurate ac voltage) to the vertical INPUT (assume B in this case).

2. Set CALIBRATOR to the .2 volt position

if

2 volt position

(use

AC-21A probe

used).

3.

Set VOLTS/CM switch to

.05,

and switch

FIGURE

VER

TIER to CAL.

4.

Sync scope internally.

5.

Use convenient sweep speed (app. .5 MS/ CM).

6.

is

Adjust R589 (accessible through frontpanel as shown) to obtain a verticaldeflection of exactly

4

centimeters on scope graticule.

Repeat procedure for channel A.

2-16

EXTERNAL INTENSITY MODULATION

I

To intensity signals

:

1.

Set

INT.

modulate the CRT with external

Z

-

EXT. Z switch to EXT.

FIGURE

Z.

Connect modulating signal to input ter-

2.

minals. peak will normal intensity. brighten the trace.

2-17

A

positive voltage of

blank

the CRT trace from

A

negative input will

20

volts

1

INT.

SYNC

I

VERTICAL

CRT

PLATES

\

HORIZONTAL

AMPLIFIER

HORIZONTAL

FIGURE

CAT

PLATES

3-1

TO

ASTlCMATlSY

3

-0

SECTION

111

THEORY

3-1

GENERAL CONTENT

This section contains a brief description of

the overall operationof the 150A Oscilloscope, descriptions of each major section and detailed explanations of the Feedback Integrator Sawtooth Generator andSchmitt Trigger. The

is

description for each major section ported by voltage and when necessary, a switch detail diagram,

at

the rear of the manual. The material in

this section

3-2 Overall Operation and Circuit 3-3 Synchronizing Circuit

3-4 Sweep Generator 3-5 FeedbackIntegrator and Diode

3-6

3-7

3-8 Main Vertical Amplifier 3-9

3- 10 Calibrator 3-

3- 12 Regulated High-Voltage Power

3-13 Single Sweep And Delayed

3-2

OVERALL OPERATION

The simplified block diagram in Figure 3-1

shows the basic signal circuits in the Model 150A Oscilloscope: the Horizontal Amplifier, Sweep Generator and Cathode Ray Tube.

a.

Vertical Amplifier - The verticalamplifier receives the input signal, amplifies

it,

and drives the vertical deflection plates.

It

provides attenuation of the input signal;

determines the direction of spot deflection

a

for the vertical positionof the spot on the screen;

supplies and incorporates

put waveform.

its

complete schematic diagram,

-

resistance-tube-location diagram

is

as

follows:

Locations

Switch Schmitt Trigger Circuits Horizontal Amplifier

Model 152A Dual Trace Amplifier

Plug-In Unit

11

Regulated Low-Voltage Power

s

UPPlY Supply Sweep Operation

Vertical

given input signal polarity; determines

a

signal for internal synchronization;

a

0.25 pec delay in the in-

Amplifier,

sup-

OF

OPERATION

The complete Vertical Amplifier circuit in three separate parts: the final amplifiers, located on the upper board; the intermediate amplifiers on the lower board on the instru-

ment chassis, input-preamplifier attenuators, phase inverters and beam positioners are on the etched

board in the Vertical Amplifier Plug-In Unit.

All connections to the plug-in unit are made through two multiple-contact connectors

,

the plug-in connections to the Main Vertical Amplifier on the instrument chassis are made through

a

tube-socket connector, while the signal path

between the intermediate and power amplifier

stages is made thrbugh the special coaxialcable delay lines.

b. Horizontal Amplifier

amplifier receives the sweep voltage either from the HORIZONTAL INPUT jack or from the internal sweep generator, amplifies

it,

and drives the horizontal deflection plates. It provides attenuation of the HORIZONTAL INPUT signal or MAGNIFICATION of the internal sweep and determines the horizontal

position of the spot on the screen.

The complete Horizontal Amplifier consists of the main Amplifier, and (used only for external signals applied to the HORIZONTAL INPUT connector). The preamplifier stage includes the VOLTS /CMportion of the HORIZONTAL SENSITIVITY selector switch and

is

set

to one of the MAGNIFICATIONpositions. The MAGNIFICATION circuit of the HORIZONTAL SENSITIVITY selector

Horizontal Amplifier. The sawtooth sweep

is

applied to the Main Horizontal Amplifier while external signals the HORIZONTAL SENSITIVITY switch and the preamplifier.

The complete Horizontal Amplifier circuit

located on the single etched board on the lefthand, swing-out chassis. Connections to the chassis connectors on the board.

are

as

shown in Figure

is

pushed into position. Power

-

The horizontal

a

preamplifier

is

not effective when the switch

is

in the Main

are

first fed through

made through two tube-socket

3-2,

is

the

as

is

-1

3

INPUT

LTTENUATORS

-

VERTICAL

AMPLIFIER

(PLUG-

(51W

TIUIICU

IN

I

)

VtRUltR

10

MAIN

VERTICAL

AMPLIFIER

VI-V6

INTERNAL-SYNC

AMPLIFIER

TRIGGER

-

YlRTlCIL

CRT

-

t4lSVOC

lUIRtCl

t

400

t

260

t

I30

-

82

-

150

UII8RIIOR

VOC

YOC

VOC

VQC

VOC

REGULATED

UIW-VOLTAGE

POWER

SUPPLIES

SEE

mirn

survu

8LOCl

OIIUU

I

SWEEP

GENERATOR

VlO-Vl7

IStl

Otllll

BLOCI:

UITWTU

SlttP

01IORA1I

UUBLIIIIXt PULSt

CRI

INTlMSlll

WWLl

10

INltISlTl

-5OOOVDC

1,,,,1$

HICH

VOLTAGE

POWFR SUPPLY

V27-VJO

d’(lllTtlSITII

PREAMPLIFIER LMPLlFlER

HORIZONTAL

FIGURE

3-2

L

UORIZQITIL

cnr

-

c.

Sync Circuit - The Synchronizing Circuit

receives a sync signal either from the

Vertical Amplifier for internal synchroniza-

from the EXT. SYNC INPUT connector

tion; for external synchronization, or from an internal 6.3-volt source for line frequency syn-

chronization. The Sync Circuit amplifies input signals, determines the input voltage level and polarity of input sync signal which

start

will reliable sync pulse for operation of the Saw-

tooth Generator.

a

sweep; and supplies a fast

all

and

switch. fied and inverted in V8A, or are amplified without inversion in V8B. The desired polarity of sync signal that the sweep plate by the TRIGGER SLOPE control. A negative-going signal lowing Schmitt Trigger positive input-sync signals from the plate of V8B while negative signals

are

All

incoming sync signals

is

then taken from the appropriate

is

required for the fol-

taken uninverted from

is

tobeusedto

V9;

consequently,

are

taken inverted

V8

A.

are

ampli-

start

-

d. Sweep Generator

receives a negative starting pulse from the Sync Circuit and generates be fed to the Horizontal Amplifier. The Feedback Integrator determines the basic sweep time per centimeter, the Retriggering Bias

Controldetermines the sensitivity of the generator to incoming sync signals and provides

either single or repetitive sweeps. The sweep generator also supplies an unblanking pulse

a

to the CRT and

sawtooth flyback) to the Dual Channel Verti-

cal

Amplifier Plug-In Unit for ALTERNATE

operation.

The complete Sweep Generator and Sync Cir-

is

cuit

the right-hand, swing-out chassis.

nections to this chassis

three tube-socket connectors and three pin

connectors on the board.

e. The CRT operated at -5000 volts. The 5AMP may be

obtained with four different phospors: green medium; plied with the 150A)

short. All are interchangeable with little readjustment and the tube

through the front panel. The mono-accelerator anode makes possible matism adjustment (located inside the access hole) which requires no resetting when adjusting the FOCUS or INTENSITY. The deflection plate terminals located on the peri-

phery of the tube

movable jumpers directly to the Main Vertical Amplifier.

3-3

The Synchronizing Circuit consists put Amplifier-Phase Inverter (V8) and Schmitt Trigger wave shaper

ceives synchronizing signals either from the EXT. SYNC INPUT connector on the panel, the Main Vertical Amplifier, or from the line frequency,

located on the single etched board on

mono-accelerator tube with the cathode

SYNCHRONIZING CIRCUIT

as

timing signal (during each

-

The CRT

2,

green long; (normally sup-

are

selected by the SYNC selector

The Sweep Generator

a

sawtooth to

are

made through

is

a

type SAMP,

7,

blue long; the

is

easily changed

a

simple astig-

connected through

(V9).

All

11,

of

V8

con-

1,

blue

re-

an In-

re-

The TRIGGER LEVEL control shifts V8's operating potentials in apositive or nega-

so

tive direction nal meets the trigger-voltage level of the following Schmitt Trigger with more or less

sync voltage input.

Sync Schmitt Trigger

going input voltage to

tion, and produces

start

by the negative-going portionof the sync pulse,

V9

(which normally follows on

form) before

start

age moved only once in one direction

produce

V9, and no more sweeps would be possible

untilV9 was returned to somewhat beyond

original

tion of the hysteresis in

a

The negative output pulse from V9B entiated, producing

which

Triggering Sensitivity Ad jus tment R 66 varies the gain of V9A to vary the hysteresis of the trigger circuit, thus determining the input voltage level which will cause the trigger to switch

Symmetry Adjustment bias level on V9B to shift the hysteresis of the trigger tive direction. This adjustment positions the hysteresis voltage limits equally above and below the 0-signal input voltage level. Since both controls affect the gain of the circuit,

a

adjustment of either one however, varying the plate load resistance of V9A varies the degree of hysteresis predominantly, while varying the grid bias on V9B varies the voltage position of the hyster-

esis

the Sweep Generator. Once triggered

must be reset by a positive-going voltage

another sweep.

a

single sweep, but would not reset

state

starts

state,

area

predominantly.

an amplified input sync sig-

V9

requires a negative-

start

the desired opera-

a

reliable output pulse to

a

repetitive wave-

it

can again be triggered and

If

the input sync volt-

(see para. 3-6 for an explana-

a

Schmitt Trigger).

is

a

5-volt negative spike

the sawtooth sweep.

(see para. 3-6). Triggering

e2

varies the grid

circuit in

a

positive or nega-

affects

the other;

all

it

would

differ-

area

of

its

3

-3

CATHODE

9-1

FOLLOWER

VIIS

UNBLANKING

PULSE

TO

CRT

SYNC

INPUT

@

/I'

/I

INVERTER

AMPLIFIER TRIGGER

V8

SYNC SWEEP

SCHMITT STA RT-STOP

v9

RETRIGGERING

BIAS

CONTROL

VI7

-

1)

-

1L

INTEGRATOR FEEDBACK

TRIGGER

VIO.VIIA VI3 V14,V15A

RETRIGGERING - SAWTOOTH

HOLD-OFF

VI66

SWITCH INTEGRATOR

INVERTER

V16A

-

/

--

T

9

11

SWEEP

OUTPUT

FIGURE

3

-4

3-3

3-4

SWEEP

The Sweep Generator consists of tubes V10, V13, V14, V15 and V16, the sweep sawtooth slope being created by Feedback Integrator V14; the sawtooth slope being terminated by the feedback loop consisting of V16A, B and V17B. The sensitivity of the Sweep Generator to the trigger pulse from V9

by the front panel SWEEP MODE control through V17A. The action of the circuit follows:

GENERATOR

is

adjustable

is

as

The hold-off time ed to be from

time. During the sweep, V16B acts

normal cathode follower, reproducing

its

cathode the positive sloped sawtooth.

During the retrace V16B

cathode capacitor charged to the most positive voltage during the sweep, slowly discharges through the shunt resistors, providing

a

is

automatically adjust-

3

times to 1/20 of the sweep

is

cut off. The

hold-off voltage for V10.

as

at

a

With no input sync pulse, Sweep StartStop Trigger voltage which keeps Feedback Integrator

V14 turned negative sync pulse, it switches state and

produces permits V14 to generate

creasing voltage. This decreasing volt-

is

age the input of VlOA through V16B and V17B. When the positive increasing voltage from V16A reaches (which

VlO),

state, shuts off the Feedback Integrator and terminates the decrease of voltage, thus creating

3-6 for explanation of hysteresis in the Schmitt Trigger circuit

During the sawtooth, V10 cannot be retriggered by subsequent negative sync pulses from V9 because VlOAis inthe

cut-off condition.

To prevent subsequent negative sync pulses from retriggering V10 immedi-

ately after

circuits to recover, applied to the input grid of

hold positive voltage on the grid the negative-going sync pulses from V9

cannot drive the grid across the lower hysteresis limit and retrigger the hold -off voltage drops back to the normal grid-bias level. The hold-off bias voltage discharge circuit, the discharge time beingdetermined by the lected by theSWEEP TIME/CM selector.

inverted by V16A and fed back to

is

it triggers

-

off bias maintains

V10

produces a low output-

off.

When VlOA receives

a

high positive voltage which

a

linearly de-

a

predetermined level

the upper hysteresis limit of

V10

back to

a

sawtooth. (See para.

its

original

.)

a

sweep and to permit

a

hold-off bias

VlOA.

a

sufficiently

of

V10

is

obtained from a capacitor-

r

and c values se-

VlOA

all

is

The

so

until

To vary the sensitivity of the sawtooth generator to the incoming negative sync

pulses from V9, the negative grid-bias

5

volts

2

volts

set to

is

a

voltage applied to the grid of VlOA moved closer to or farther from the low-

If

er trigger level of V10.

is

adjusted with the SWEEP MODE control very close to the trigger point, V10 can be switched by very small negative voltages, below the lower trigger point the sweep generator will free-run.

bias voltage tion, away from the lower hysteresis limit, to trigger

The negative sync pulses from V9 which trigger the sweep generator peak or greater for sync signals up to

approximately one megacycle. Since the

sweep generator put triggers of approximately peak, !when the

PRESET, the sync pulses from V9 provide very reliable triggering for nearly

all

sync signals encountered. However,

as

the repetition rate of the incoming sync signal cycle, the spike from Schmitt Trigger V9

will decrease in size, and the sensitivity of the Sawtooth Generator must be in-

creased by lowering the bias voltage to

VlOA with the SWEEP MODE control.

V17B serves to combine the variable bias with the sawtooth and hold-off voltages whichare fedto the grid ofSchmitt Trig-

ger V10.

if

the bias voltage

is

moved ina positive direc-

a

larger negative pulse

VlO.

is

set to respond to in-

SYNC

is

increased above one mega-

the grid bias

is

If

is

are

control

reduced

the grid-

required

is

-5

3

3-5

FEEDBACK INTEGRATOR AND DIODE

SWITCH

The complete Feedback Integrator Circuit consists of Feedback Integrator V14 which creates the sawtooth slope, Diode Switch V13

which starts and stops the integrator action,

and Cathode Follower V15A which provides d-c coupling from the Integrator plate to the

grid. To direct-couple the Integrator plate to the Cathode Follower grid requires the three constant voltage lamps, 13, 14, and I5

in series todrop the d-c plate levelto an appropriate value for the grid of V15A. Prior

to the generation of

grid coupling

the integrator-capacitor

the generation of the sawtooth, plate-to-grid

coupling The operation of the circuit before and dur-

a

sweep

ing

Before a sync signal Stop Trigger low, positive output-voltage level, which is

fed through Cathode Follower V12A to

the cathodes of the Diode Switch V13.

The two diodes conduct, effectively shorting out the Integrator Capacitor (C55 through C63). and effectively connecting the plate of the Feedback Integrator the grid through Cathode Follower V15A. This d-c degenerative feedback locks the

circuit in

put voltage of the sweep generator

tionary and the

tionless. Thus the sweep starts from fixed position regardless of sweep speed.

When

gers Start-Stop Trigger V10, the Trigger produces which biases the Diode Switch V13 beyond cutoff, opens the Switch, and permits the Integrator grid voltage to rise and begin charging the feedback capa-

citor. While the grid side of the capa-

citor charges toward approx. t130 volts, the plate-side potential drops 80 volts for each volt of grid voltage rise.

is

through the integrator capacitor.

is

a

negative synchronizingpulse trig-

a

sawtooth, the plate-to-

through the Diode Switch and

is

shorted. During

as

follows:

is

received, Start-

V10

produces a relatively

stable state holding the out-

sta-

spot on the screen mo-

high, positive output-voltage

to

a

To obtain the graduations in sweep time

beginning on the shortest sweep, the

switch selects one capacity value and

three different total resistance values

1

(in the ratio of ranges, and repeats this process using

10

x

larger values of capacity; however,

between the 5 and 10 microsecond ranges

and between the .5 and

the capacity remains the same and the

resistance value

tor of 10.

During the generation the grid-side of the capacitor has risen only 1/80 of the plate voltage swing, approximately 1.4 volts. 1% portion of a capacitor charging curve

is

very linear, the resultant plate swing

is

also

very linear. In addition, the de-

generative platsto-grid the integrator capacitor provides three important characteristics: it stabilizes the circuit characteristics have little affect upon the slope and linearity of the sawtooth; improves able with

by an amplifier;

ent value of the

a

factor equal to the gain of the integra-

tor tube,

simple

fier which multiplies the rate of riseof the capacitor charging curve by the gain

of the amplifier. invalue of the timing capacitor

the degenerative feedback inherent in the Feedback Integrator which reduces the tendencyof the grid voltage to change by

a

factor equal to the gain of the amplifier.

Aportion of the sawtooth voltage pled back to the Start-Stop Trigger to

close the Diode Switch and to the sweep generator when its output has reached 110 volts.

a

sweep

the Diode Switch allows the timing capa-

citor to discharge and commences the retrace. During the sweep retrace, the

integrator charging resistor mented by R89 which volts, thus giving

of

age

same manner

so

the linearity over that obtain-

a

as

integrator followed by an ampli-

110 volts

11

constant slope at the output, in the

:2 :5) for the first three

1

second ranges

is

increased by a fac-

of

the sawtooth,

or

Since the

f

e edback through

that normal changes intube

simple integrator followed

it

increases the appar-

integrator capacitor by

compared to the action of

The apparent increase

is

centimeters long. Closing

sufficient to cause

is

returned to -150

a

positive voinq volt-

as

described above.

first

is

due to

is

cou-

supple-

,

it

a

is

The sawtooth slope values of the grid-to-Bt resistor (R143

through R156) and the grid-to-plate capa-

citor (C55 through C63)

the SWEEP TIME/CM selector switch.

determined by the

as

selected by

For the various SWEEP TIME/CM ranges

the ratioof retrace to sweeptime varies from1/3 to 1/1000 in accordance with the

ratio of R89 to the particulac charging

resistance in use (R148 to R156).

3-6

SCHMITT TRIGGER CIRCUITS

A Schmitt Trigger consists of two amplifiers (twin triodes in the 150A) having d-cplate-togrid coupling from A to B amplifier and d-c

cathode - to - cathode coupling. The circuit

has two stable

side cut off;

off. The change-over from one state to the

is

other decay times from each side of the circuit, either of which can be used for triggering subsequent circuits.

The d-c voltage level applied to the A-side grid determines which state the circuit will

be in. If the grid voltage

.

level, A sidewill conduct and B side will not;

if

below that same level, B side will conduct and grid voltage crosses this threshold, the circuit will change state. Inpractice, the threshold voltage in

a ing the grid in a negative direction. The two different voltage levels are called the upper and lower hysteresis limits of the circuit.

To trigger the circuit, age must cross the particular hysteresis limit which will change the state of the circuit. A side voltage positive through limit will have no affect, but driving the grid voltage negative through limit will put side into conduction.

very rapid, producing fast rise and

A

side will not. Each time the A-side

positive direction, and lower when mov-

is

already conducting, driving the grid

states;

B

side conducting, A side cut

is

higher when moving the grid

A

side out of conduction, and B

A side conducting, B

is

above a certain

the A-side grid volt-

its

upper hysteresis

its

lower hysteresis

In the Start-Stop Trigger, A side is conduct-

ing, and the grid voltage can be set by the SWEEP MODE control to be below the lower hysteresis limit, in which case the trigger

automatically switches state without an input trigger pulse and the sawtooth generator free

is

runs. As the bias level

lower hysteresis limit, the circuit requires

increasingly larger input trigger pulses to

switch the trigger. The incoming sync signal

is

not large enough to pass the positive hys-

so

teresis limit,

its

original state. The positive voltage which

resets the trigger verted sawtooth fed back to the A-side input.

3-7

HORIZONTAL AMPLIFIER

The complete Horizontal Amplifier consists of the Main Horizontal Amplifier which drives

the deflection plates; and a preamplifier for

signals applied to the EXT. HORIZ. INPUT

permits vernier gain control and gives beam deflection to the right for negative input signals. The Main Amplifier the entire amplifier Main Amplifier contains gain adjustments for the MAGNIFICATIONranges of the HORIZ SENSITIVITY switch, frequency response, balance and centering adjustments. The preamplifier contains an input voltage divider,

If

which inconjunction with the gain selector in the main am lifier, provides the EXT. PUT VOLTSAM ranges of the HORIZ. SENSITIVITY selector. The operation of the Horizontal Amplifier

cannot reset the trigger to

is

moved above the

obtained from the in-

is

push-pull and

direct-coupled. The

as

follows:

IN-

The initial A-side grid bias can be positioned anywhere inside or outside the hysteresis area, thus establishing the input voltage level required to change A's state. In the Sync

Schmitt Trigger, the A-side grid bias

tioned midway between the upper and lower hysteresis limits, while in the Stop -Start Schmitt Trigger the grid bias from below the lower hysteresis limit up to

about midway between the hysteresis limits.

In the Sync Schmitt Trigger, A side ducting and to drive the grid voltage from the midway bias to below the lower negative hysteresis limit to switch the circuit. The input sync signal must then drive the grid beyond the upper positive hysteresis limit to for the next incoming sync pulse.

a

negative sync signal

reset

is

adjustable

is

required

the circuit

posi-

con-

3-7

Horizontal deflection signals are selected

either from the EXT. HORIZ. INPUT

preamplifier or from the Sweep Genera-

tor

by the HORIZ. SENSITIVITY selector and are then coupled to the grid of V20 through frequency-compensated voltage dividing networks. V20 and V21 two sides of phase inverted signal for V21 through amplifier V19A and cathode Follower Vl9B. The inverted signal voltage is

developed bybringing the two gridreturns from V20 and V21 to point, and driving the phase inverter from this junction.

The maximum gain of the Main Horizon-

tal

Amplifier which varies the gain of Phase Inverter V19. Varying the gain of the Phase Inverter results in an unbalance in signal

a

push-pull amplifier. The

is

set

by adjusting R199

are

is

obtained

a

common

the

.

levels to the grids of V20 and V21, but the balance plifier by the common cathode resistors for V20, V21 and V23, V24.

The MAGNIFICATION and VOLTS/CM positions of the HORIZ. SENSITIVITY

selector determine the horizontal deflection sensitivity by inserting input attenuators and adjusting the degeneration in the common cathode circuit of V20 and V21. In the X1 position, the cathode-to-

cathode resistance mum) and the sawtooth input to V20 attenuated by a factor of approximately

10. In the X5 MAGNIFICATION position, the attenuation factor proximately sitivity 5 times. In the X10, X50 and

10

0

X cathode -to and V21

the deflection sensitivity increased

and

20

times over that present on the X5

position. The XlOO Magnification Gain

Adj. potentiometer, R213, provides minor adjustment in the cathode-to-cathode resistance to compensate for transconduc-

tance variations and the XlOO positions, when the cathode-

circuit resistance

Similar operations are performed in the EXT. INPUT positions. In the

1

VOLT/CM positions of the HORIZ.

and SENSITIVITY selector, the gain ratios

set

are

as

described above. Attenuation serted 2 and 5 VOLTS /CM positions.

There

the HORIZ. SENSITIVITY selector between the 5 VOLTS/CM and the XlOO MAGNIFICATIONpositions. In this position, signals applied to the EXT. HORIZ.

INPUT connector are fed directly to the

Main Horizontal Amplifier without going through the Ext. Input Preamplifier.

This position

of the gain and frequency response of the

Main Horizontal Amplifier. In this posi-

tion the Main Horizontal Amplifier

connected exactly

CATIONposition. Under these conditions the deflection sensitivity

The push-pull signals from V20 and are direct-coupled through Cathode Fol-

lower Drivers V22A and Amplifiers V23

is

restored later in the

is

highest (gain mini-

is

reduced to ap-

2,

increasing deflection sen-

MAGNIFICATION positions the

-

cathode resistance of V20

is

progressively decreased and

is

most effective in

is

lowest.

by cathode-to-cathode resistors

at

the preamplifier input for the

an unlabeled switch position on

is

useful during adjustment

as

in the X5 MAGNLFI-

is

2

VOLTS/CM.

B

to the Output

and

V24. The signals

.2,

is

am-

2,

.5,

in-

V21

is

10

is

from the plates of the Output Amplifiers are returned through feedback networks to the input of the Drivers. The feedback networks contain adjustments of the transient response to assure linear plification of the sawtooth voltage for sweep times.

The signals from the Output Amplifiers are coupled through Output Cathode Followers V25A and

flectionplates. The Capacitance Drivers

V26A and

the Output Cathode Followers during

negative waveform. Without the output-tube impedance during

increasing discharge time of the

circuit capacity prevents the cathode voltage from accurately following the grid voltage. This effect increasing the current thru the Output Cathode Follower during periods when its output moves in The increase in cathode current about by supplying the capacitance driver grid with a

differentiating network (C96, R239, and C95, R242) from the opposite side of the circuit. The Capacitance Driver for

particular side positive-going portion of the output from that side.

Neonlamps are used in the grid circuits

V19B,

of

coupling without loss of signal amplitude. Yhe neonlamps are returned

through reliable lamp operation. A smallbypass

capacitor assures good coupling

frequencies.

3-8

MAIN

The signal from the plug-in vertical amplifier

is

fed through the left-hand connector on the plug-in unit chassis to the Mainvertical Amplifier on the instrument chassis. The Main Vertical Amp!.ifier co'nsists of an input amplifier, delay line, buffers and output amplifiers, entire circuit contains only two adjustments, a plification and a frequency response control to compensate the high frequency end of the pass band.

all

gain control to standardize the overall

B

-

going portions of the outpyt

a

negative-going swing, and the

a

positive-going voltage through

V23, and V24 to provide direct

a

value of resistance that assures

VERTICAL

push-pull and direct coupled. The

B

to the horizontal de-

improve the performance of

a

capacitance driver

is

increasing

is

prevented by

a

negative direction.

is

ineffective during the

at

AMPLIFIER

am-

all

small

brought

-150 volts

at

high

am-

a

3

-8

Input amplifiers

mum gain of about 20 db. R5, the gain ad-

justment potentiometer, inserts degeneration

in the cathode-to-cathode coupling between V1 and V2 to vary their gain over

The signals from V1 and V2

two 0.25 microseconddelay lines (one ineach

side of the amplifier) to the final amplifier

stages. Each delay line consists of a 25inch length of RG-176/U coaxial cable. To provide satisfactory delay phase shift in both sides of the amplifier all frequencies, the physical lengths of the

cables are cut to provide identical electrical lengths. Both ends of each ated with the resistance value which matches the characteristics impedance of the cable.

These terminating resistors are R1, R12, R8 and R13.

At the various frequencies the operation of the circuit and up to 25 cycles, the signal from

through R4 through the delay line, then R12

a

and signal mately 25 cycles, C1 and C5 become effec-

tive, shunt the two 330K resistors and produce a capacitive

KC

At 3 are equal to the magnitude of the reactance of C1 and C5 and therefore at the high fre-

quencies the line sees only R4and R12 and is correctly terminated.

load R4shunted by R12at the other end of the line, thus cutting the plate load in half. The effect of the gradual transition from

voltage divider toa 2:l decrease inamplifica-

tion provides

tion with accurate matching over the band.

To prevent capacitive mismatch of the delay lines

at

V1

and V2 are coupled to the delay lines through bridged-T networks. To reduce capacitive loading

cathode followers

of the output amplifiers

gain of output amplifiers mately 16 db. When replacing the delay lines, replace in pairs with specially prepared

cables obtained from the Hewlett Company.

3-9

MODEL

is

second resistor R10, thus giving a 50%

loss

the terminating resistors R4and R12

high frequencies the plate circuits of

at

theoutput end ofthe cables, double

152

V1

and V2 provide a maxi-

a

4 db range.

are

fed through

i.

e.,

exactly equal

cable are termin-

as follows: Beginning at D-C

V1

travels

at the grid of V3. At approxi-

2: 1 division of the signal.

V1

now sees

flat

amplification in conjunc-

are

used

as

.

The low -fr equency

V6

and V7 is approxi-

its

plate

a

2:l

buffers ahead

-

Packard

DUAL TRACE AMPLIFIER

PLUG-IN UNIT

The Dual Trace (vertical) Amplifier contains

two identical amplifiers, each with an input-

sensitivity' range switch, trace positioning circuit and about half of the total decibel gain

in the complete vertical deflection system.

The output circuits of two amplifiers are joined ,and the resultant continuous signal fed through push-pull cathode followers to the Main Vertical Amplifier on. the instrument

chassis. a-c coupling, between vertical input put attenuator.

At the input to each channel compensated voltage dividers provide attenuation of the in-

at

put signal to of each channel in

from 05 volts per centimeter (no attenuation of the input signal) by 20 volts per centimeter (attenuating the input signal by

400). Each step and independent is no cascading

quency response of each attenuator section

is adjusted individually

tion 4-18E.'

The

sists of push-pull cathode followers; one side receives the input signal, as determined by

the input POLARITY switch; the input to the

other side

thenfed to one side of the next stage the other

side of which two cathodes of the second stage ted together thru the VERNIER and calibrate potentiometers. The potentiometers vary the cathode-to-cathode coupling and introduce

cathode degeneration to vary the gain of the

stage, and to act

Holding the position of the trace when the VERNIER gain control the plate currents of the two halves of the

phase inverter do not change. This requires

that the bias on the two tubes remains unchanged, which in turn requires that the VERNIER gain control be operated between

points having zero potential difference. The

BALcontrol adjusts the grid bias to one side of the phase inverter met.

The positioning of the spot

by equally and oppositely varying the d-c level

at

the two plates of the phase inverter. The d-c levels direct coupled to the following amplifiers.

To prevent cathode resistors when the POSITIONpotenti-

ometers are yaried,

All

circuits are direct-coupled; for

a

blocking capacitor

connector and the in-

control the vertical sensitivity

5,

a

1,

2,

of

attenuation is separate

of

the others because there

of

attenuator sections.

first

stage of the Vertical Amplifier con-

is

grounded. The input signal

is

effectively grounded. The

at

the same time permit the stage

as

a

phase inverter.

so

as

well

as

the signals are then

a

change in current through the

a

portionof .the position-

10.

as

explained in Sec-

that this condition

is

accomplished

is

...

a

are

is

switched

sequence

factor of

Fre-

is

connec-

stationary

varied,

is

I

3-9

-

TRANSFORMER

-

T3

--

-

- -

I

+250

V

I

5-.

--

-8

-

tb

&

I

OVERLOAD

RE LAY

I

SERIES REGULATOR

v33.v34,v35,m

SERIES REGULATOR

V37.V30,V39.V40--150

SERIES

REGULATOR

--I50

-

+260

-

+

900

V IREGJ

VfREI?)

V

-

+260 V IREGI

‘IREF)

Df130

VIREGI

s12

THERMAL

CUTOUT

I

1

-

FIGURE

3-4

I

K4D

-

c

-150

ADJ

REFFOR

SUPPLIES

-

VIREGI

R377

ALL

3-10

ing voltage

a

manner that the currents remainunchanged.

The 3rd stage, Switched Amplifiers V503A

B,

and as a switch that can be turned off and on rapidly during ALTERNATE and CHOPPED operation. The plate circuits of the switched amplifiers are frequency compensated to ex-

tend the upper frequency limit to above 10

megacycles. The plate circuits of the Switched Amplifiers

in one channel are connected to the output of

the other channel, without attenuation.

mixing of signals takes place since the amplifier the Ifoff" channel always appears

circuit to the

is

fed back to each cathode in such

provides 15 db gain and also serves

s

cannot be operated simultaneously;

as

an open

"onff

channel.

No

multivibrator, while the pentode plate serves to electron-couple the multivibrator to the output circuit. During the negative portion of the output waveform, tube conduction discharges stray capacities rapidly and affords improve waveform rise-time when the tube goes out of conduction, CR1 clamps aportion of the plate load to the +13O-volt buss during

the positive-going half of the wave. This effectively reduces the resistance throughwhich

stray capacities must charge, thus reducing rise time, while retaining a high plate-load resistance to limit tube conduction during the

negative-going half of the waveform.

a

comparatively

fast

decay time. To

-

going

3-1 1 REGULATED LOW-VOLTAGE POWER

SUPPLY

The Dual Channel Amplifier also contains

circuits for switching the and on during CHOPPED and ALTERNATE operation.

For CHOPPED operation, the Switching Multivibrator free -runs kilocycles, switching each of the channels

at

off and on

eration

Switching Multivibrator and applied through

V504B to the CRT intensity grid chopping lines between the two traces will be

blanked out.

For ALTERNATE operation, bias converts the free-running multivibrator to a bistable flip-flop.

A signal obtained from the Sweep Generator

at

the end of each sweep switches the Multivibrator from one state to the other, thus alternately turning on one channel for one sweep,

3-10

CALIBRATOR

The calibrator circuit tivibrator which proximately 1000 cps, the rate being primar-

ily determined by C116, R292 and C117, R285.

The 100-volt square-wave output

going with the base line clamped to ground by crystal diode CR2. The output voltage

selected from a voltage divider composed of R289, R290, R291 and the attenuator in the

CALIBRATOR selector switch. The output half of the multivibrator tube, V32,

ode whose screen serves

this rate. During CHOPPED op-

afast

negative pulse

the other channel for the next.

is

made to free run

two

channels off

at

approximately 100

is

takenfrom the

so

that the

a

high negative

aplate-coupled mul-

at

is

positive-

is

a

pent-

as

the plate for the

ap-

is

The complete low-voltage power supply shown

in figure 3-4 provides five regulated and one

as

unregulated voltages

-150 Volts, -82 Volts, t130 volts, t260 volts and t400 volts; unregulated, +415 volts.

Each regulated voltage supply except the -82

volt has its

rectifier. The -150-volt supply contains the reference voltage for plies and The unregulated outputs from the rectifiers which supply the three positive-voltage sup-

plies are stackedin series. The higher-volt-

age regulated supplies tap in at higher volt-

ages on this stack. The totalcurrent require-

ment of the three positive-voltage regulated

supplies must flow through the lowest rectifier in the stack, which heater current to tubes. Thus the negative return of the lowest

stacked supply

the tube heaters voltage held constant bya shunt voltage regulator. The shunt regulator, V49 and V50, absorbs slight differences in the 150A's in-

stantaneous current requirements and input variations such that the voltage applied to the

d-c heater string The operation of the four regulated-voltage

supplies

is

described. V44, V45 and V46 are the regulator tubes which act tors controlled by the voltages at the control and screen grids of Control Tube V47. regulated output voltage from the cathode of the Series Regulators tends to increase the voltage crease, causing V47 to draw more current.

This lowers the plate voltage of V47 and con-

own

transformer winding and

is

thus the only independent one.

a

is

returned to ground through

as

a

is

identical

at

the grid of V47 tends to in-

follows: regulated

all

other regulated sup-

is

sufficient for d-c

series string of electron-

load with the total heater

constant.

so

only the -150v supply

as

variable resis-

If

the

,

3-11

sequently the gridvoltage on the series regulators, resulting in greater plate resistance in the series regulators. The greater plate resistance causes a larger voltage drop

cross the tubes, instantaneously compensat-

ing for the increased voltage output, and re-

sults in substantially constant voltage output.

If

the regulated output tends to decrease, the

reverse of the above action occurs. The

screen of V47

connecting variations andripple in the unregulated input voltage ner. The three screen resistors are chosen

so

that input voltage changes of

caused by line voltage variations are almost wholly screen-compensated. Ripple at the input to the regulator duced below the level possible by controlgrid compensation. Ripple in the output voltage

is

coupled to the grid V47 by capacitor C143, while slow variations in the d-c level are fed to the grid of V47 through voltage divider R378, R379 and R380. The normal

bias for V47 and the resultant’output voltage

from the regulators, setting of potentiometer R379. The heater voltage for Control Tubes V40, V43 and V47 (controlling -150v, +130v and t260v outputs) are d-c regulated to eliminate tube contact-

potential changes occurring with line-voltage

variation, thus permitting extremely constant output voltages. This extremely close regulation provides the high d-c amplifier stability necessary for very low trace drift.

In the complete Low Voltage Power Supply

there are four protective switches of which

three are dc relays and one actuated switch. Dc relays K1 (Thermal Time Delay Relay), K4 (Turn on Relay), and K2 (Overload Relay) protect the components of the oscilloscope from damage due to exces-

sive voltages during the turn on period when current drain to be high and from damage due to excessive currentbecause of an overload or cuit. S12 Thermal Cutout, actuated switch, protects the oscilloscope from damage caused by excessive operating temperatures. Should the fan

become clogged, or ambient temperature

rise, the operating temperature at S12 reaches approximately 150°F.

S12

is

used

as a control grid for

in

exactly the same man-

+lo%,

is

thus substantially re-

is

determined by the

is

a

temperature

is

low and output voltages tend

a

short cir-

a

temperature

fail,

the filter

will shut off the instrument when

a-

as

voltage during the turn on period. Figure

is

a

block diagram of the Lowvoltage Power Supply showing these relays and Overloadrelay

K2

in the normaloperating position. When

is

power not energized and its contacts are in the upper position. Input voltage into the series regulators chassis level by the series resistors and K1 receives heater voltage from SR3. tion to operating K1, SR3 furnishes heater current to the tubes in the dc heater string that these the time relay K1 closes. When relay K1 closes andallows the -150 volt supply to come

up to full output, relay K4

ergizing K4 shorts out the series resistors

in the other supplies and permits their outputs

to rise to their operating values. Contacts

K4C remove the heater voltage from Thermal

Time Delay Relay K1 permitting it to cool and its contacts to open. Since K4 also has contacts which short the series resistor in the -150 volt supply, the coaling of K1 has no effect. However, once K1 has cooled, any

interruption of ac power or of energizing voltage for K4 de-energizes K4 and thus lowers

all

regulated output voltages until the time

delay cycle OverloadRelay K2

dc heater voltage ( -82 vdc) exceeds -110 volts the current from the three positive voltage rectifiers (after the range of the shunt regulator has been exceeded) an excessive increase of current from any positive supply

will

de-energizing K4 to lower the voltage outputs of the series regulator as previously explained; by removing exitation voltage to the heater of K1; and by disconnecting the Shunt Reg-

ulator and the dc heater string from the volt buss. voltage fromKl’s heater, K1 would go through

its cycle of operation and connect the -150

volt supply for full output. Disconnecting

loads except the overload relay from the

volt buss causes tive supplies to flow through K2 thus keeping K2 energized until ac power to the instrument

is

interrupted. In fact, a filter capacitor in

the power supplykeeps K2 energized for sev-

eral seconds after ac power has been removed from the instrument.

first appliedto the instrumentK4

is

effectively reduced nearly to

tubes will be ready to operate by

is

energized. En-

is

completed.

is

energized whenever the

.

Since this voltage

trip Overload relay K2. K2 operates by

If

K2 did not remove the exitation

all

current from the posi-

is

dependent upon

In

3

-4

addi-

so

-82

all

-82

is

During the time that the 150A there is almost no loadon the power supplies and consequently their output voltages would

if

rise excessively prevent such K1 and Turn On RelayK4 prevent this rise of

a

no steps were taken to

rise. Thermal Time Delay

is

warming up

Keeping the output voltages of the Low Voltage Power Supply depressed during turn on also keeps the outputs of the High Voltage Power Supply within bounds since its output voltages are dependent upon the plate and

screen voltages

3

-12

of

the

rf

oscillator, V27.

3-1

2

REGULATED HIGH-VOLTAGE POWER

SUPPLY

The cathode of the CRT in the 150Ais operat-

at

-4800

ed

mately -5000 volts each obtained from ply which has an independent transformer

seconding winding and rectifier, but driven

by a single 60-kc high voltage oscillator.

volts, the intensity grid

at

approxi-

a

sup-

Mag: XlOO

50

Sweep: 10, 20, and

Input: 1-kc sinewave, 6-cmde-

fle cfion

Intensity: dim

Focus and

Astigmatism: optimum

ms/cm

I-

A feedback-control amplifier V28, regulates

the CRT cathode supply by determining the

60-kc oscillator's screen voltage and hence

its

power output. Any tendency for the output voltage of the Cathode Supply to shift approximately cancelled by increasing or de-

creasing the quired to compensate for that shift. The CRT grid-supply voltage being unregulated, varys

slightly variation, however, occurs only when the

beam intensity andhence oscillator excitation

are

The Intensity Grid Supply to couple CRT unblanking pulses, which vary in rate from almost d-c to radio frequency,

to the Intensity Grid. the supply the supply Follower VllB in the Sweep Generator, the high-voltage end to the intensity grid through the INTENSITY control. The entire intensitygrid supply rises and falls with the unblanking pulse from VllB and the pulse mitted directly to the intensity grid.

The winding and stray capacities in the sec-

ondary of this supply trical ground of the winding, with regard to

the oscillator driving voltage, the low-voltage side of the winding toward the high-voltage side. This introduces

siderable 60-kc signal voltage into the lowvoltage lead, which

create objectionable intensity and sweep modulationon the scope trace

60-kc oscillator frequency. This undesired

60-kc voltage duction of an out-of-phase charging current

which

C108

tion under the following most adverse conditions:

as

varied, and

is

adjusted for minimum trace distor-

amplitude of oscillation

CRT beam current

is

proper.

is

floating; the low-voltage end of

is

connected to Unblanking Cathode

are

if

not suppressed, would

is

balanced out by the intro-

supplied through C107 and C108.

is

varied. This

is

separate in order

To

accomplish this,

such that the elec-

is

shifted from

at

the high-voltage,

is

as

re-

trans-

a

con-

Any residual distortion should be almost

6th harmonic of the oscillator fundamental

which

3.13

is

Other descriptions of the operationof the 150A Sweep Generator apply principally to normal

sweep operation, top access door) in the NORMAL position. Severaluseful modes of operation ble with In SINGLE SWEEP operation, starting from the already reset condition,

can be started through any of the usual channels, and the sweep terminates in the usual fashion. Before another sweep can be initiated, no matter how many triggers arrive meanwhile,

essary; the resetting action canbe done either

manually by use of the SWEEP MODE control or electronically by application of an appropriate pulse to the RESET connector

side the access door.

For SINGLE SWEEP operation,. V17 to

cathodes of V17A, V17B, and V16B together. In this explanation the sweep generator

the SWEEP MODE control position; V17A

indicator lamp I6

condition; with these conditions the next negative sync pulse from Schmitt Trigger V9 will

start

ed level the trigger occurs

after

tive-slope sawtooth its

cathode circuit and to raise that voltage until the lower hysteresis limit of Schmitt Trigger V17 t3, conduction switches from V17A to V17B (indicator lamp I6 goes out) and the cathode

is

unavoidable.

SINGLE SWEEP AND DELAYED

SWEEP OPERATION

i.e.,

S4

in the SINGLE SWEEP position.

a

specific resetting action

with

S4

(inside the

are

a

single sweep

S4

a

Schmitt Trigger circuit, and ties the

it

will be assumed that

is

in the armed condition;

is

in the PRESET

is

conducting, V17B cutoff;

is

lit,

indicating the armed

a

sweep. Refer to Figure 3-52 the

at

the common cathodes

the sweep has been triggered, the posi-

cathode to take control of the common

is

reached. When this happens,

at

ti.

At time t2, shortly

at

the grid of V16B causes

possi-

is

converts

is

El,

at

all

nec-

in-

arm-

and

time

3 -13

FIGURE

3

3-5

-14

potential jumps to E3; from time t3 totime

t4 V17B controls the common cathode voltage.

at

Eventually, the inverted sawtooth of V16B rises to such gains control of the common cathode circuit, and when E4, the upper hysteresis limit

V10,

is

reached, the sweep time t5. At the termination voltage at which time V17B regains control and establishes the lock-out bias applied to the grid

of

the same

conduction was switched from V17A to V17B.

As

cannot be retriggered, since the output

Sync Schmitt Trigger V9

overcome the lock-out bias. To reset the sweep circuit ed by V9,

tion from V17B back to V17A (at which time indicator lamp I6 will done manually by rotating the SWEEP MODE control away from PRE-SET and back again, or it can be done electronicallyby applying resetting pulse to the RESET connector inside the top access door (the pulse must be from one to four microseconds wide and from

at

the grid of V16B drops back to E3,

VlOA. This lock-out bias level E3

as

the level established

long

as

this condition remains the sweep

so

that it can again be trigger-

it

is

necessary to switch conduc-

a

value that V16B re-

is

terminated,

of

the sweep, the

is

insufficient to

r

e-light). This can be

the grid

is

at

t3 when

of

at

thus

of

t15

to t25 volts high). In Figure 3-5 reset shown voltage drops from E3 back to El.

Manual single-sweep operation for viewing or photographing

current phenomenon; electronic-reset opera-

tion in conjunction with an external delay

generator pulse will normallybe used inviewing repetitive waveforms. Two modes reset operationare available. One mode, obtained with the SWEEP MODE control set to PRE-SET, provides first vertical signal after the reset pulse; thus the display tween the delay trigger and the signal under observation. The other mode, obtained with the SWEEP MODE control in FREE-RUN,

starts

pulse, regardless of the presence or absence of vertical signals, usually the same results can be obtained without an externaldelay gen-

a

erator through NORMAL operation of the

sweep generator in conjunction with the INT. SWEEP MAGNIFICATION positions of the HORIZ. SENSITIVITY selector.

at

time t6, when the common cathode

is

convenient

a

single non-re-

as

the source of the resetting

of

electronic-

a

sweep triggered by the

is

not affected by jitter be-

a

sweep instantaneously after the reset

is

3-15

SERVICING ETCHED CIRCUITS

0

APPLY HEAT SPARINGLY TO LEAD REMOVE PART FROM CARD AS IRON MELTSTHE

OF

PART TO

BE

REPLACED.

SOLDER.

@

BEND CLEAN LEADS ON NEW PART

AND CAREFULLY INSERT THROUGH

HOLES

ON

BOARD.

I

@HOLD PART AGAINST BOARD

AND SOLDER LEADS.

FIGURE

4-1

I

SECTION

MAINTENANCE

4-

1

INTRODUCTORY

This section contains instructions for adjusting and servicingthe 150A Oscilloscope. The 150Ais constructed circuit sections single etched circuit board, except for the Main Vertical Amplifier which utilizes two

separate chassis. The material in this section

is

divided section having instructions, and at the rear of the manual, a

schematic and a voltage-resistance dia-

gram. The material in this section

follows

4-2 4-3 4 -4

4-5 4-6 4-7

4-8

4-9

4- 10 4-11 4- 12

4- 13

4-

14

4- 15

16

44- 17

4- 18

:

Replacing the Air Filter

Removing the Cabinet Connecting for 230 -Volt Power Lines

Servicing Etched Circuits

Tube Replacement Chart Isolating Troubles to Major Sections

Adjusting the Low-Voltage Supplies Adjusting the RF High -Voltage

Supply Replacing and Adjusting the CRT

Adjusting the Calibrator Adjusting the Main Horizontal Amplifier Adjusting the Ext. Horiz. Input Preamplifier Adjusting the Sync Circuit Adjusting the Preset Sensitivity

of the Sweep Generator Calibrating the Sweep Generator Adjusting the Gainand Frequency

Response of the Main Vertical

Amplifier Adjusting the

Amplifier

4-2 REPLACING THE

The

air

-filter element in the 150A able type. It instrument cabinet by

is

removed by pulling straight down. To re-

new the filter element, wash in warm water

is

so

that each of the major

is

physically located on

as

the circuit sections, each

a

complete set of adjustment

is

9

152A Dual Trace

AIR

FILTER

is

a

renew-

retained in the bottom of the

two

bullet catches, and

as

IV

and detergent, then recoat with the special oil, Filter Coat

Products Gorp., Madison spect the

constant

a

4-3

REMOVING THE CABINET

The 150A chassis and panel are removed from the cabinet by removing the four retainer screws on the rear of the cabinet and sliding the chassis forward out of the cabinet.

4-4

CONNECTING FOR 230-VOLT POWER

air

use.

LINES

The 150A tory with the dual primary windings of the two power transformers connected in parallel for use on 115-volt a-c lines. The windings

can easily be reconnected in on 230-volt power connections to both power transformers are identical, and each requires the same change in connections. To reconnect the primary

windings of TZ and T3 for use on 230 volts,

on each transformer disconnect the jumpers

which join terminals nectl0-ohm diskthermistors RT301 to T2 and RT302 to T3 between terminals 4 and place the 6-amp fuse with the 150A can now be operated from 230 volt lines with no change in operation.

4-5

SERVICING ETCHED CIRCUITS

Figure 4-1 illustrates how to replace electrical parts on etched circuits.

When servicing etched circuits, DO NOTpush or pull wires in such wiring from the board.

When soldering leads on the etched board, use

sparingly to the leads on the part to be replaced, not to the wiring on the board.

Before installing new parts, clean holes to receive new part without forcing. Have new

is

a

50 watt iron or smaller. Apply heat

No.

3,

made by Research

10,

filter often when the 150A

normally shipped from the fac-

if

desired. The primary

1

to 4 and 2 to

a

Wisconsin.

series

a

3-amp fuse and

way

as

to raise the

is

for use

5.

Con-

5.

In-

in

Re-

4-

1

MAIN VERTICAL AMPLIFIERS

FINAL (ABOVE INTERMEDIATE (BELOW)

1

HORIZONTAL AMPLIFIER

I)

MAJOR

SECTIONS

HIGH VOLTAGE

POWER SUPPLY

AND CALIBRATOR

II

LOW VOLTAGE

POWER SUPPLY

PLUG -IN

VERTICAL AMPLIFIER

w

FIGURE

SWEEP GENERATOR

AND SYNC AMPLIFIER

4-2

leads tinned and ifnecessaryfluxed to receive

a

solder quickly with

without residue

4-6

TUBE REPLACEMENT CHART

The heaters of some of the tubes in the 150A Oscilloscope are operated in series from regulated d-c voltage obtained from the LowVoltage Power Supply. This series heater string age Power Supply schematic diagram; the

actual connection through each circuit

shown individually on the schematic of the circuit. When replacing tubes during trouble shooting, if one of the series tubes

it

4-7

is

shownin one piece on the Low-Volt-

will turn off

ISOLATING TROUBLES

.

all

the other tubes in the string.

minimum of heat and

is

pulled,

TO

MAJOR

SECTIONS

In any case of trouble Shooting, attempt operation of the various sections of the scope and determine which major section

contains the circuit failure. When this determined, refer to the Location Diagram, the Voltage -Resistance Diagrams and the

Tube Replacement Chart for assistance with

changing tubes and measuring voltages and resistances in each circuit. See that

are

tubes with

a

Start by measuring the voltages of the main

power leads from the power supply, then

measure voltages at the sockets of tubes in

the circuits which are suspected. When trouble shooting direct-coupled

circuits, the mally balanced and cause the spot to be sta-

tionary in the center of the scope screen. A fault in either side will usually unbalance the

circuit and cause the spot to move off the screen. To bring the spot back, short to-

gether the control grids (or the plates) of the

two sides of one stage. This eliminates sig-

nals of which originate prior to the shorted points. If shorting the two halves of ddes not bring the spot on the screen and hold

it motionless, By continuing this process through the amplifier the trouble can be isolated to circuit area. returns the spot, the trouble can be in the

plate-load resistors or in the grid or cathode

circuits of the following stage.

a.

Check the Low-Voltage Power Supply

voltages

lighted; check by replacement or

tube checker; then measure voltages.

two

sides of the circuit are nor-

all

types, d-c unbalance, jitter, etc.

a

stage together

a

subsequent circuit

If

shorting the plates! together

as

described in paragraph 4-8.

os

,

push-pull

is

faulty.

a

cillo-

all

the

small

b. Check the High-Voltage Power Supply

voltages

c. Check the Calibrator

paragraph be used to quick-check the horiz'ontal and vertical amplifiers and the sync circuits.

d. Check the Sweep Generator. With the

a

is

SWEEP MODE control, attempt freerunning; then, stop the free-running. Connect the CALIBRATOR output to the SYNC input and attempt synchronization with various CALIBRATOR output levels of the SWEEP MODE control. With instrument out of cabinet, note condition of the ISWEEP is

not lighted no sweep the lamp voltage.

e. Checkthe Vertical Amplifier by connect-

ing the CALIBRATOR output to the vertical inputs. Note the resultant deflection and wave shape.

not operate, trouble shoot that channel; neither one operates properly, trouble shoot

the Main Vertical Amplifier.

Check the Horizontal Amplifier in the

f.

same manner

4-8

ADJUSTING POWER

The complete, low-voltage power supply pro-

vides five, separately-regulated output volt-

ages: -150 jdc, -82 vdc, t130 vdc, $260 vdc and t400 vdc. circuit shown inFigure 4-3. The low voltage supply has two interdependent adjustments

which set the -82-volt filament supply and the

-150-volt output. There are no separate adjustments for the +130-volt, t260-volt and t40O-volt regulated supplies. tive voltages depend upon correct adjustment of the -150-volt supply; the t400 vdc supply depends also upon having the correct output voltage from the t260-volt supply.

All

regulated voltages can be conveniently

measured through the access hole over the

High -Voltage Power Supply etched board at the top-rear of the instrument chas-

sis.

To adjust the -82-volt and the -150-volt

supplies refer to Figure 4-3 and proceed

follows:

as

described in paragraph 4-9.

as

described in

4-1

ONvt

neon indicator lamp. If the lamp

is

operated by the sweep "turn-on"

If

one channel of the plug-in does

THE

The Calibrator can then

1.

at

various settings

is

in process, since

as

the Vertical Amplifier.

LOW-VOLTAGE

SUPPLIES

All are located onthe one etched

All

the posi-

-

circuit

as

if

4-3

TUBEREPLACEMENTCHART

MAIN VERTICAL AMPLIFIER

Tube

Designation

v1,

v2

v3

AB

v4

AB

V5, V6

v7

AB

V8

v9

Tube Type

~

6

197

6yL6

6BQ7A

6

197

or

6CL6

6AU8

6BQ7A 6BQ7A

Tube Function

Input Amplifier

Double Cathode Followers

Output Amplifiers

Internal-Sync Preamplifier

SWEEP GENERATOR

Sync Amplifier-Inverter Sync

S

chmitt Trigger

Ad just me nt Re quir ed

Adjust the Main Vert. Ampl. Gain, R5

(see para. 4-17)

No

adjustment required.

Adjust the Main Gain, R5 Adjust High Frequency Response, C8

(see para. 4-17)

No

adjustment required.

No adjustment required. Adjust Trigger Sensitivity,

R66

(see

para. 4-14) Adjust Trigger Symmetry, R72 (see para. 4-14)

Vert.

Ampl.

VlO

v11

v12

V

13

V 14

V15 V16

AB

AB AB

6BQ7A

1/26BQ7A

1

/26BQ7A 6AL5 6AH6

6BK7A 6BQ7A

Sawtooth Start-Stop Trigger

Cathode Followers

Cathode Followers Integrator Switch

Feedback Integrator

Cathode Followers Sawtooth Inverter and Re-

triggering Holdoff Cathode Follower

4-4

Adjust (see

No adjustment required. No adjustment required. No ad jus tme nt Adjust Sweep Amplitude, R122

Calibrate Sweep Speeds, R143, ~144, ~145, ~157, c59, C41, C78 (see para. 4-16)

No adjustment required Adjust Preset Adj., R103

(see para. 4-15) and Adjust Sweep Amplitude R122 (see

Preset

para. 4-15)

Adj., R103

r

para. 4-16a)

equir ed

.

c61,

.

TUBEREPLACEMENT CHART

I

Designation

E

v20, v21

6BQ7A Retriggering Bias Control

6BQ7A

6AH6

6

SWEEP GENERATOR (Cont'd.)

Tube Type Tube Function

Tube

HORIZONTAL AMPLIFIER

Ext. Horiz. Input PreAmplifier

Amplifier -Phase Inverter Push-pull Amplifiers

ti5

Adjustment Required

Adjust Preset Adj., R103

(see

para. 4-15)

Adjust Input Capacity Adj., C74 and Frequency Response Adj., C75. Adjust Ext. Gain, R178 Adjust Ext. Bal., R185

(see para. 4-13) No adjustment required. Adjust Main Horiz. Gain

(see

para. 4-12a)

Adjust XlOO Magnification Cal.

(see para. 4-12b) Adjust X5 to XlOO Magnification Centering and X1 Centering

(see

para. 4-12c)

Ad just Frequency Response

(see

para. 4-12d)

v22 V23, V24

V25

I

V26AB

AB

6BQ7A

6

197

or

6CL6

6BQ7A

~~

6AU5GT

12AU7

Push-pull Cathode Followers

Push-pull Output Amplifiers

Push-pull Output Cathode

Followers

Push -Pull Capacitance

Drivers.

HIGH VOLTAGE SUPPLY AND CRT CIRCUIT

HIGH VOLTAGE POWER SUPPLY

60-KC, Hi-Voltage Oscillator

Voltage Control Tube

No adjustment required. Adjust Main Horiz. Gain

(see para. 4-12a) Adjust Frequency Response

(see para. 4-12d) No adjustment required

No

adjustment required.

Check both high-voltage outputs.

(see

para. 4-9)

Check both high-voltage outputs.

(see para. 4-9)

.

4-5

HIGH VOLTAGE

SUPPLY

AND CRT CIRCUIT (Cont'd.)

Tube

Designation

V29

V30

1

V3

V32

v33, v34, v35

Tube Type

3A2

5AMP

6U8

12B4A

Tube Function

KIGH VOLTAGE POWERSUPPLY

Beam Hi-Voltage Rectifier

Intensity Hi-Voltage Rectifier

Cathode Ray Tube

CALIBRATOR

1-KC Multivibrator

LOW VOLTAGE POWERSUPPLY

t400-Volt Series Regulators

Adjustment Required

Check both high-voltage out-

puts.

(see

para. 4-9)

Check both high-voltage outputs.

(see

para.

Adjust Astigmatism, (R2, R3) Main Vert. Gain Adj., R5

Main Horiz. Gain Adj., R199

(see para. 4-10,4-17, and 4-12a)

No

adjustment required.

Visually inspect waveform.

No

adjustment required

4-9)

.

V36 V37, V38,

v39 V40

1,

V42

V4 v43 v44, v45,

V4 6 v47

V48

AB

v49

V50

6BH6

12B4A

6BH6

12B4A

6BH6

12B4A

6BH6

1

565

12AX7

12B4A

+400-Volt Control Tube t260-Volt Series Regulators

t260-Volt Control Tube

+

130-Volt Series Regulators

t130-Volt Control Tube

-

150-Volt Series Regulator?

-

150-Volt Control Tube

Power Supply Reference

Tube

-82-Volt Control Tube

-

8 2-Volt Shunt Regulator

%

No

adjustment required.

No

ad jus tment r equir ed

No

ad just me nt r e quir e d

No

adjustment required.

No

adjustment required

Check -150V Adjust.

(see para. 4-8)

Check -150-Volt output

(see

para. 4-8)

Check -150-Volt output

(see

para. 4-8)

Check -82-Volt output

(see para. 4-8)

No

adjustment required.

. .

.

4-6

TUBE REPLACEMENT CHART

@I

MODEL 152A DUAL TRACE AMPLIFIER

Tube

Designatior

V501 in V507 in B

V502 in V508 in B

V503 in A

V509 in B

A

Tub e TYPe

6BQ7A

Tube Function

~

Input Cathode Followers

Phase Inverter

Swjtched Amplifiers

Adjust me nt Required

Adjust Input Capacitors, C517 and C518 for INPUT A, C548 and C549 for INPUT B.

(see para. 4-18d) Adjust Balance, R519 for INPUT A, R586 for INPUT B. (see

figure 2-11)

Adjust

Vert.

Gain Cal. R524 for INPUT A R589 for INPUT B (see figure 2-14) Adjust

Vertical

Centering R561 (see

para. 4-18a)

Adjust Balance,

R519 for INPUT A R582 for INPUT B

(see figure 2-11) Adjust Neut. Capacitor, C5

Adjust Neut. Capacitor, C520 (see para. 4-18b)

'

19

V504

V505

V506

v5 10

AB

6AN8

12AU7A

6BK7A

6BQ7A

Alt. Sweep Trigger Amp. and Cathode Follower

Switching Multivibr ator

Amplifier

Output Cathode Follower

No

ad jus tment required Check triggering sweep

rates.

at

.

highest

Select tube for best symmetry during chopped operation.

Make certain that the trace

does not switch channels be-

a

fore the end of

sweep on ALTERNATE operation. Check on slowest sweep speed.

Adjust Vertical Centering, R56

1

(see

para. 4-18a)

4-7

R

379

ADJUST

REGULATED SUPPLY

(SEE

-

I50

PARA,

VOLT

4-8)

LOW VOLTAGE POWER SUPPLY REGULATOR

ADJUST

REGULATED HEATER SUPPLY

(SEE

-

REAR

OF

CHASSIS

R

382

-82

PARA.

VOLT

4-8)

FIGURE

-

4-3

4-8

a.

Remove the 150A from the cabinet; turn on and allow to warm up for 5 minutes.

With an accurate d-c voltmeter, measure

b.

the d-c voltage between the -150-volt

measuring point and chassis.

c. Connect a d-c voltmeter having an input

impedance of 1000 megohms between

ground and the -4800-volt measurement point.

If

d.

necessary, adjust R275 to obtain -4800

volt

s

.

c.

If

necessary, adjust R379 to obtain -150-

volts. Measure the d-c voltage between the -82-

I

d.

volt measuring point and chassis.

e.

If necessary, adjust R382 to obtain -82 volts.

f.

Recheck jhe -150-volt supply. Measure the t130, t260 and t400 volt outputs.

The voltages of these supplies

1%

resistors and should be within 2% of their

specified voltages.

4-9

ADJUSTING THE POWER

Be careful when adjusting the high-voltage

CRT beam and intensity supplies; the voltages for the CRT cathode and intensity con-

trol grid are -4800 and -5050 volts to chas-

sis,

respectively. Use a high-voltage, high impedance probe such sistive Voltage Multiplier with the 410B Voltmeter.

SUPPLY

RF

HIGH-VOLTAGE

as

Model 459A

are

fixed by

DC

Re-

e. Measure the d-c voltage at the grid of

is

the CRT when the intensity

minimum.

,

f.

To

minimize the ripple on the -5000-volt

output to the 20 MILLISEC/CM and the HORIZ. SENSITIVITY selector to the

Apply

g.

INPUT

the 150A showing one cycle of sine wave.

h. Using an insulated screwdriver, adjust

C

ple modulation on the sine wave trace.

4-10

REPLACING AND ADJUSTING THE CRT

set

theSWEEP TIME/CM selector

XlOO

a

500 cps sine wave to the vertical

A to obtain a sine presentation on

108A to obtain minimum residual rip-

turned to

position.

WARNING

HANDLE THE CATHODE RAY TUBE

C

AR

E

F U L L

brokenpieces to travel forward, out

of the tube.

Y.

Impolsion causes

r

-f

The arately rectified dc output voltages from

single for the cathode of the CRT and-5000 vdc unregulated for the grid. R275 (see Figures 4-4 and4-13) sets the -4800 vdc cathodevoltage by controlling the amplitude of oscillation of the oscillator and thusvaries the grid

supply voltage at the grid voltage should remain between -4950 vdc and -5050 vdc when the INTENSITY control occurring

To adjust the high voltage supply refer to Figure 4-4 and proceed

a.

to warm up for 5 minutes.

.

b

high-voltage supply provides two sep-

60

kc oscillator; -4800 vdc regulated

the same time. However,

is

turned to minimum and no sweep

is

.

as

follows:

Remove the instrument from the cabinet. Turn the instrument on and allow

Check the output of the low-voltage power

(see

supply

paragraph 4-8).

a

Turn the INTENSITY control to minimum when applying power to CRT. The phosphor can quickly by too much brightness.

The CRT can be replaced without removing the instrument cabinet. To replace the cathode-ray tube, refeT to Figures 2-9 and 2-10 and proceed

a.

Loosen the clamp on the CRT socket.

b. Remove the five clip leads to the deflec-

tion-plate and accelerator terminals on

the neck of the CRT.

-tube to gain access to the terminals. Remove the front-panel bezel (see Fig-

c.

ure 2-9).

as

CAUTION

follows:

be

damaged

If

necessary, rotate

a

new

4-9

MEASURE CATHODE VOLTAGE(-4800V)

HERE

0

CRT CATHODE

CRT

0

GRID

0

nY

ADJUST

DANGER

HIGH

VOLTAGE

5000

k;q

VOLTS

fiyggy

-LADJUST

\

+260

-

(t415V

DC

UNREGULATED)

FIGURE

4-10

4-4

100

Grasp the CRT

d.

ment lever

base free of the socket. cated on the High-Voltage Regulator deck

Remove the CRT through the front panel.

e.

Insert the replacement CRT through the

f.

front panel and connect to socket.

g. Replace front-panel bezel. ceed

Position the socket assembly

h.

face

of the CRT

Reconnect the five deflection-plate and ac-

celerator leads. b. Set theCALIBRATOR selector to the 100

i.

Set theINTENSITY control to Max. CCW position. Turn the instrument on and

allow to warm up. j. Set SWEEP MODE control to FREE RUN. d. Remove V32.

k. Adjust the INTENSITY control to obtain

a

weak trace; adjust the FOCUS control

a

for tion control, center the trace vertically.

1.

sharp trace, and with thevertical posi-

Align trace with graticule 2-1

0).

base

and, using the align-

as

a

fulcrum, work the CRT

is

seated on the bezel.

(see

SO

that the

Figure

volts. The peak positive voltage

a

screwdriver adjusted potentiometer lo-

by

(see Figure 4-4). This peak positive voltage can be measured with

V32

is

removed.

To measure and adjust the 100-volt, CALI-

BRATOR output,

as

follows:

a.

Remove the 150A from the cabinet; turn on and allow to warm up for 5 minutes.

volt position.

c.

Connect an accurate d-c voltmeter to the

CALIBRATOR output.

to obtain exactly t100 vdc BRATOR output connkctor. cannotbe brought to 100 volts, checkthe t130and the -150-volt supplies. still

too high, replace crystal diode CR1.

e.

Replace V32.

refer

a

d-c voltmeter when

to Figure 4-4 and pro-

If

necessary, adjust R290

at

If

the d-c voltage

If

the voltage

is

set

the CALI-

is

m. Making certain the CRT face

the bezel, tighten the clamp on the CRT

socket. n. To readjust the astigmatism control,

connect the CALIBRATOR output to the

vertical input.

0.

Set the VOLTS/CM and CALIBRATOR

selectors to obtain approximately

deflect ion. p. Simultaneously adjust the focus and the

astigmatism for the best overall focus,

or for optimum sharpness inany desired area. q. Check the gain calibration of the Main

Vertical and MainHorizontal Amplifiers.

Paragraphs 4-17 and 4-12.

is

against

6

cm

4-1 1 ADJUSTING THE CALIBRATOR

The output voltage from the CALIBRATOR approximately a 1000-cycle /sec. square wave

is

0

which

volts peak during the on period when set for

volts during the off period andt100

is

4-12 ADJUSTING THE MAIN HORIZONTAL

AMPLIFIER

The Main Horizontal Amplifier contains the

s

following screwdriver ad jus tment on the Horizontal Amplifier (left-side) swingout chassis:

4-12a. Main Horizontal Gain Ad-

just m ent

4- 12b. XlOO MagnificationCalibra-

tion

4- 12c. X5 Magnification Centering

and X1 Centering

4- 12d. Main Horizontal Amplifier

Frequency Response Ad

justments

located

-

4-12A MAIN HORIZONTAL GAIN

ADJUSTMENT

Before adjusting the main horizontal gain

check and if necessary adjust the astigmatism

as

control

The gain of

adjusted by potentiometerR199 and should be

instructed in paragraph 4-19.

tlie

Main Horizontal Amplifier

is

4-1

1

HORIZONTAL AMPLIFIER

REOUIRES NO READJUSTMENT

ADJUST MAIN HORIZ AMPLIFIER

FREQUENCY RESPONSE

(SEE

PARA 4-12d)

R213

ADJUST XlOO MAG GAIN

(SEE PARA 4-12b)

ADJUST X1 CENTERING

ADJUST MAIN HORIZ AMPLIFER

FREQUENCY RESPONSE

R189

(SEE PARA

(SEE

ADJUST MAGNIFICATION CENTERING

4-12~)

PARA 4-12d)

(SEE

R

207

PARA.4-12c)

R178

ADJUST EXT. HORIZ. INPUT

VOLTS

/

CM

(SEE PARA.4- 13b

//

/

R199

ADJUST EXT. HORIZ. BALANCE

(SEE PARA. 4-13a)

7r

ADJUST X

(SEEPARA 4-12d OR PARA 4-16b)

\

LADJUST

INVERTER FREQUENCY

R

I85

c75

ADJUST EXT HORIZ INPUT FREQUENCY RESPONSE

(SEE

PARA 4-13~)

C78

1

FREQUENCY RESPONSE

ADJUST EXT HORIZ INPUT

CAPACITY

(SEE PARA.4-13c)

c77

ADJUST

X5

FREQUENCY RESPONSE

(SEE &RA 4-12d)

(SEE PARA.4-12d)

TO XlOO MAG

C80

RESPONSE

FIGURE

4-12

4-5

i

I

set to produce an initial deflection sensitivity

of 10 volts /centimeter when the HORIZ. SEN-

is

set

SITIVITY selector CATION position. When R199 Inverter Frequency Response adjustment C80

is

also affected, and the frequency response must be checked and adjusted paragraph 4-12d. To adjust the Main Horizontal Amplifier Gain, refer to Figure 4-5 and proceed

a.

up for five minutes.

as

follows:

Pull the 150A approximately 5 inches out of the cabinet;

turn on and allow to warm

to the X1 MAGNIFI-

is

adjusted,

as

shown

to lesser degrees. On the XlOO range, the

sensitivity of the Horizontal Amplifier should

100

be just

VOLT, or 10 CM/VOLT, and ment of potentiometer R213. The CALIBRATOR output

in

To calibrate the XlOO MAGNIFICATION range of the HORIZ. SENSITIVITY selector, refer to Fig. 4-5 and proceed as follows:

Pull the 150A approximately 5 inches out

a.

of the cabinet; turn on and allow to warm

up for five minutes.

times the X1 sensitivity of

is

set byadjust-

can

be used for this adjustment.

.1

CM/

,

I

!

I

i

1

I I

I

b. Set the CALIBRATOR selector to the

volt position. Connect the CALIBRATOR output to both the EXT. HORIZ. EXT. SYNC INPUT connectors.

Connect the SAWTOOTH OUTPUT inside

c.

the top access door to the vertical INPUT A connector.

d. Set the INPUT A VOLTS/CM selector to

the 5 VOLTS/CMposition; SENSITIVITY selector to the straight down position midway between the XlOO MAGNIFICATION and the 5 VOLT/CM positions; set the SWEEP TIME/CM selector to the .5 MILLISECOND

e.

Adjust the TRIGGER LEVEL control to

give square wave should now be presented vertically on the 150A scope screen.

f.

Adjust the Main Horiz. Gain Adj. R199 to

obtain exactly 10 centimeters horizontal

deflection for the 20-volt peak-to-peak input. g. Check frequency response

paragraph 4-12d.

Adjust theX5 to XlOO and the X1 Center-

h.

ing adjustments

4-12~.

The basic gain of the Horizontal Amplifier now correctly set. of the SWEEP TIME/CM selector

correct, the Sweep Generator adjustment, see paragraph 4-16.

/CM

position.

a

stable trace. Several cycles of

as

shown in paragraph

If

the overall calibration

INPUT and

set

the HORIZ.

as

shown in

is

no

is

in need of

20

is

longer

b. Set the CALIBRATOR selector to the

VOLT position.

c. Note the single grey wire that connects

between the Sweep Generator swing-out chassis out chassis. Disconnect this lead from the

pin connector on the Horizontal Amplifier

etched board. Connect CALIBRATOR output to this board connection.

d. Also, connect the CALIBRATOR output

e. PUT A connector.

f. set the HORIZ. SENSITIVITY selector toXlOO

MAGNIFICATION position;

/CM to .5 MILLISECONDS/CM position; set

the SWEEP MODE control to PRESET. g. Adjust the TRIGGER LEVEL control to square wave should now be presented verti-

cally on the 150A scope screen.

h. peak-to-peak horizontal deflection. i. ment of R213 to obtain best overall accuracy.

and the Horizontal Amplifier swing-

a

jumper from the

to the EXT. SYNC INPUT connector. Connect the SAWTOOTH OUTPUT inside

the top access door to the vertical IN-

Set the vertical INPUT A VOLTS/CM

selector to the

a

give

Adjust the XlOO Magnification Gain Adj. R213 to obtain exactly

Check magnification obtained on the X50 range.

stable trace. Several cycles of

If

necessary, refine the adjust-

5

VOLTS/CM position;

set

SWEEP TIME

10

centimeters

1

I

i

I

4-1

2B X100 MAGNIFICATION CALIBRATION

The

XlOO

range of the INT. SWEEP MAGNIFICATION selector a

calibration adjustment; however, this ad-

justment also affects the X50 and X10 ranges

is

the only range that has

4-12C

The MAGNIFICATION centering adjustments position the spot when the cathodes of V20 and V2lare potentials. This assures that when the sweep

4-13

X5

TO

XlOO

MAGNIFICATION

CENTERING AND

at

the center of the screen

X1

CENTERING

at

equal

is

magnified, the center of the original trace remains in the center of the screen. The X5 to XlOO Magnification Centering Adj. R207

all

affects FICATION selector. The X1 Centering Adj.

R189 readjusts the centering in the X1 posi-

tion only, and must be set after R207 rectly

fer to Figure 4-5 and proceed

a.

Remove the 150A from the cabinet; turn on and allow to warm up for five minutes.

b.

Adjust the FOCUS, INTENSITYand

SWEEP MODE controls to give a small

undeflected spot on the 150A screen.

c. While repeatedly switching the HORIZ.

SENSITIVITY selector from X5 to XI00

positions and back, adjust the HORIZ. POSI-

TION control until the spot does not change

position

is

tor of the HORIZ. POSITION control.

d. Set the HORIZ. SENSITIVITY selector.

to the X5 MAGNIFICATION position. Adjust the X5 to XlOO Magnification Cen-

e.

tering Adi. R207 to center the spot on

the screen. HORIZ. POSITION control. R207 terchange V20 and V21 or V23 with V24 and

repeat step e. f.

Set the HORIZ. SENSITIVITY selector

to X1 position. Adjust the X1 Centering Adj. R189 to cen-

g.

ter

4-12D

positions of the SWEEP MAGNI-

is

cor-

set.

To make these adjustments re-

as

follows:

as

the HORIZ. SENSITIVITY selec-

switched. Do not disturb this setting

v

Db

not disturb this setting'of the

If

the range of

is

not sufficient

the spot on the screen.

to

center the spot, in-

MAIN HORIZONTAL AMPLIFIER FREQUENCY RESPONSE ADJUSTMENT

The linearity of the oscillosco7e sweep requires complete and accurate adjustment of the MainHorizontal Amplifier Frequency Re-

sponse. The frequency-response adjustments

are

made by viewing square waves of three different frequencies and requires wave generator with rise times of. 02 microsecond or better and an output of volts peak-to-peak. At each of the three

frequencies, adjustments are made to achieve flatness of the top and bottom of the squarewave viewed on the scope screen. Since the

Main Horiz. Gain Adj. has some effect upon

the frequency response of the amplifier, it

should be correctly set

graph 4-12a before

as

instructed inpara-

the frequency response

a

square-

at

least

7

test

is

adjusted. To adjust the frequency response of the Main Horizontal Amplifier, refer to Figure 4-5 and proceed as follows:

a.

Connect SWEEP OUTPUT of 150A to vertical INPUT.

b. Connect the 117521 output of an @Model

is

test.

1

lo-

is

so

211A Square Wave Generator to pin

V20 through

This

connection can be made

of R204 andR187.

to the Horizontal Position control and cated directly behind this control.

Connect the EXT. SYNC. INPUT of the 150A under

c. Set oscilloscope POLARITY switch to

"AC POS.

Set oscilloscope SYNC control to "EXT.

d.

AC" and SWEEP MODE to "PRESET".

e.

SetverticalVOLTS/CMat"l"

IER

Set Square Wave Generator to 100 KC.

f. g. Switch oscilloscope HORIZ.SENSITIVITY

control to llX5".

h. Locate "Sweep Output" connector on

Sweep Generator Board. This point most easily located gray wire at pin 7 of tube V13; Disconnect

gray wire

i.

Set the 211A controls to obtain a horiz-

ontal deflection of approximately 8 centi-

meters. Use viewing two or three cycles.

j.

Adjust C84 and C88 followed by C85 and

C89 plus C80 to obtain the best possible square wave pattern. Capacitors C84 and

C88 control one time constant, C85 and C89

a

second time constant, and C80 a third time

constant. The waveforms obtained will vary with input

frequency. Some high frequency ringing will

be noted but should be disregarded whenmak-

ing these adjustments.

The following procedure

1.

they are set to approximately equal values

a

0.1

pf,

600

volt capacitor.

at

the junction

Resistor R187

"6OOAl1

output

is

connected

of

the 211A to the

UP".

andVERN-

at

ltCAL".

as

the connector with

at

this connector.

a

sweep speed that will permit

is

recommended:

Set capacitors C84 and C88 to the center

of their adjustment range

.

of

a

4 -14

2.

Adjust for the best possible square wave pattern by rotating C84 and

C88 each approximately the same amount

as

to keep both capacitors

as

same value

3. Adjust capacitors C85 and C89 plus C80 for the best possible square

wave pattern. Capacitors C85 and C89 are formed by metal straps around encapsulated resistors R219 and R224 respectively. Adjust by sliding straps long encapsulated resistors.

k. Set the HORIZ. SENSITIVITY selector to

IIX10". Reduce the 1175211 output from

the 211Agenerator to obtain

flection

211A should be set to 100 KC.

1.

any ringing present when making this adjustment.

m. Reconnect the wire disconnected in step

n. Disconnect the 11752f output of the 211A capacitor used in step

"75," output directly to the "EXT. HORIZ. INPUT". Set the 211A to 10 KC.

0.

Set the izontal deflection which will be approximately

4

centimeters. Use a sweep speed that will

permit viewing two or three cycles.

p.

of

approximately 8 centimeters. The

Adjust capacitor C86 to obtain the best possible square wave pattern. Disregard

h.

from pin

Switch the HORIZ. SENSITIVITY selector to the unmarkedvertical test position.

2

11A controls to obtain maximum hor

Adjust capacitor C77 to obtain the best

possible square wave.

possible.

1

of V20, remove the

2,

and reconnect the

close to the

a

horizontal de-

0.

a-

1

pf

4-13 ADJUSTING THE

EXT.

HORIZ. INPUT

PREAMPLIFIER

The External Horizontal Input Preamplifier contains the following screwdriver adjustments located on the Horizontal Amplifier swing-out chassis. These adjustments should notbe attempted unless the gain and frequency response of the Main Horizontal Amplifier

are known to be correctly adjusted.

4-

13a. External Balance Adjust-

ments

4-

13b. External Horizontal Input

Sensitivity Calibration

4-

13c. External Horizontal Input

Capacity and Frequency Response Adjustments

4-1 3A HORIZ. BALANCE ADJUSTMENT

Adjustment of the horizontal Ext. Bal. Adj.

potentiometer R185 minimizes shifts in hori-

zontal centering when the VERNIER control

is

varied. To adjust the Ext. Bal. Adj. re-

fer to Figure 4-5 and proceed

a.

Remove the 150A from the cabinet; turn on and allow to warm up for five minutes.

b.

Set the HORIZ. SENSITIVITY selector to the

.2

VOLTS/CM range. Adjust the

HORIZ. POSITION and the INTENSITY con-

a

trols to obtain

-

c.

While turning the horizontal VERNIER

control up and down repeatedly, adjust the Ext. Bal. Adj. potentiometer R185 until the spot does not move trol

is

moved.

4-13B

EXT.

HORIZ. INPUT VOLTS/CM

spot of medium intensity.

as

follows:

theVERNIER con-

CALIBRATION

The Ext. Gain Adj. potentiometer R178 sets the gain of preamplifier tube V18 to calibrate the EXT. INPUT VOLTS/CM positions of the HORIZ. SENSITIVITY selector switch. To make this adjustment, refer to Figure

and proceed a.

Perform steps a through d of paragraph 4-13a, above.

b. Set the CALIBRATOR selector to the

VOLT position and connect the CALI-

BRATOR output to the EXT. SYNC INPUT.

c. Connect the SAWTOOTH OUTPUT in the

top access to the input

cal amplifier.

4

-15

as

follows:

of

the plug-inverti-

4-5

2

R

144

ADJUST

ADJUST 1 MICROSECOND/GM

(SEE

10

MILLISECONDS/CM

PARA. 4-16b)

R

143

a1

SECONDICM

PARA, 4-16b)

C

61

PARA, 4-16b)

C67

ADJUST

ADJUST SYNC TRIGGER SENSITIVITY

.I

MICROSECOND/CM

(SEE

PARA. 4-16b)

R

66

PARA. 4-14)

(SEE

ADJUST PRESET SENSITIVITY ADJUST SYNC TRIGGER SYMMETRY

(SEE

PARA.

4-15)

SWEEP GENERATOR

R

145

ADJUST 1 MILLISECON

(SEE

PARA. 4-16b

(SEE

PARA. 4-14)

R

122

ADJUST SWEEP AMPLITUDE

(SEE

PARA.

c

59

ADJUST

10

MICROSECOND/CM

(SEE

PARA. 4-16b)

C

64

.5

MICROSECONDICM

(SEE

PARA. 4-16b)

C

40

HF

SWEEP AMPLITUDE

(SEE

PARA, 4-160)

C

65

.2

MICROSECONDICM

(SEE

PARA. 4-16b)

4-160)

FIGURE

4-16

4-6

Set the vertical VOLTS/CM selector to

d.

set

2 VOLTS/CM;

selector to

SWEEP MODE control to PRESET;

SYNC selector to EXT;

SITIVITY selector to .2 VOLTS/CM. Adjust the TRIGGER LEVEL control to obtain trace.

e.

Connect the CALIBRATOR output to the EXT. HORIZ. INPUT.

f.

Set the EXT. HORIZ. INPUT VERNIER

control to the CAL. position.

g. Adjust the

R178 to obtain

of 10 centimeters, disregarding overshoot if

present.

1

MILLISECOND/CM;

Ext.

the SWEEP TIME/CM

set

the HORIZ. SEN-

a

stable

Gain Adj. potentiometer

a

square wave amplitude

the the

position. Several cycles of square wave

should now be displayed vertically on the 150A scope screen.

f.

Adjust C75 for the straightest top and

bottom on the square wave.

g. Replace the connection from the CALI-

BRATOR output to the EXT. HORIZ. PUT with the AC-21 Probe which has been adjusted for use with the 150A's vertical plifier.

h.

Set

the CALIBRATOR output to the '50

VOLT position.

i.

,

Adjust C74 for the straightest top and bottom on the square wave

the 150A scope screen.

as

viewed on

IN-

am-

4-13C EXT. HORIZ. INPUT CAPACITY' AND

FREQUENCY RESPONSE ADJUSTMENT

The EXT. INPUT VOLTS/CM section of the HORIZ. SENSITIVITY selector switch has two adjustments for frequency response, C72

and C75, and two adjustments for standardizing the input capacitance, C71 and C74.

The two frequency response adjustments ten the response of two different attenuator networks. The two input capacity adjustments equalize the EXT. HORIZ. INPUT capacity

with the vertical INPUT A and B capacity that the 10: 1 divider probe can be used inter-

changably with either input without readjust-

ment of the probe. To make these adjust-

ments, refer to Figure 4-5 and proceed

follows

a.

b. Set the CALIBRATOR selector to the 5

TOR output to the EXT. SYNC INPUT. c. Connect the SAWTOOTH OUTPUT in the

d. Set the vertical INPUT A VOLTS/CM

set

MILLISECONDS /CM position; set the SWEEP MODE control to PRESET; set the SYNC lector to EXT. Adjust the TRIGGER LEVEL

control to obtain

e. Connect the CALIBRATOR output to the

SENSITIVITY selector to the .5 VOLTS/CM

:

Remove the 150A from the cabinet; turn on and allow to warm up for five minutes.

VOLT position and connect the CALIBRA-

top access door to the verticalINPUT A.

selector to the 2 VOLTS/CM position;

the SWEEP TIME/CM selector to the .5

a

stable vertical

EXT. HORIZ. INPUT. Set the HORIZ.

trace.

flat-

so

as

se-

j. Set the HORIZ. SENSITIVITY selector

to the 2 VOLTS/CM position. Increase

the CALIBRATOR output voltage to obtain

square -wave amplitude of several centi

meters.

k.

Adjust C71 and C72 to obtain the straight-

est topand bottom of the square wave viewed on the 150A scope screen. C71 and C72 affect widely differing time constants

such that their separate effects

distinguished.

4-14 ADJUSTING

The Sync Circuit has three interdependent adjustments; calibrating the zero position of the TRIGGER LEVEL control; adjusting Trigger Sensitivity; adjusting Trigger Symmetry. All

three must be adjusted in one procedure.

Calibrating the zero position of the TRIGGER LEVEL control equalizes the d-c voltage level from the two plates of Phase Inverter the TRIGGER LEVEL ing the Trigger Sensitivity establishes the minimum input sync signal voltage whichwill operate Schmitt Trigger V9. Adjusting Trigger Symmetry adjusts the Schmitt Trigger to have equal sensitivity to both positive and negative going signals, hysteresis lower limits can be positioned symmetrically

about the d-c bias level obtained from V8 with the TRIGGER LEVEL the Sync Circuits, refer to Figure 4-6 and proceed

a.

as

Remove the 150A from the cabinet; turn on and allow to warm up for 5 minutes.

THE

area

follows:

SYNC CIRCUIT

set

is

i.e.,

of

V9

so

set

to

that the upper and

to zero. 'To adjust

are

V8

ttO't.

it

adjusts the

as

easily

when

Adjust-

a

-

4-17

Connect ad-c VTVM (isolatedfrom chas-

b.

sis)

to pins 1 and 6 (plates) of

V8.

a.

Remove the 150A from the cabinet; turn on and allow to warm up for

5

minutes.

c. Set the TRIGGER LEVEL control to ob-

0

tain

d.

If position the TRIGGER LEVEL knob to

indicate

voltage

move-the meter.

of the TRIGGER LEVEL control.

e. Connect an audio oscillator to the SYNC

INPUT connector. Adjust oscillator to

be between 20 and 50 kilocycles.

f.

Connect

to give

flection, to pin 2 (grid) of V9.

Adjust the oscillator output to obtain

g.

4-cm deflection on the test oscilloscope and adjust the complete cycles on the screen. One pip should appear on each slope of the sine wave. The upper pip

should be on the positive slope of the sine

wave; the lower pip

should be on the negative slope of the sine

wave.

If

h.

teresis" area exactly

i.

If hysteresis area exactly midway between

the top and bottom of the sine waves.

j. The two adjustments, R66 and R72, inter-

act and must be repeated until both the

hysteresis area and the position are correct.

volts on the voltmeter.

necessary, loosen the set screw and

0

(top center) when the difference

as

read on the voltmeter

Do not disturb the setting

a

test

oscilloscope, calibrated

a 1 volt/centimeter vertical de-

scope sweep to observe four

is

the upper hysteresis limit, and

is

the lower limit, and

necessary, adjustR66to obtain atlhys-

necessary, adjust R72 to position the

is

zero. Re-

1

centimeter wide.

.1

b. Set SWEEP TIME on

CM, SWEEP MODE

c.

While measuring the d-c voltage

2 'of V10, turn the SWEEP MODE control clockwise from the PRESETposition until the Sawtooth Generator free runs. moment the generator begins to free run, the voltage reading will suddenly drop. Note exact voltage reading before the drop.

d. Set the SWEEP MODE control to PRE-

SET. Note the voltmeter reading.

necessary, adjust R103 to obtain a reading

is

that obtained in step d.

a

exactly 1.5 volts

MILLISECOND/

on

PRESET.

less

negative than

4-16 CALIBRATING THE SWEEP GENERATOR

Calibrating the Sweep Generator includes one adjustment for Sweep Amplitude located in

the Sweep Generator, and one fine adjustment for Sweep Slope located in the Main Horizontal

Amplifier. Do not attempt the Sweep Slope Adjustments unless the Sweep Amplitude (para. 4-16a), the MainHorizontal Gain (para. 4-12a) and the Main Horizontal Frequency

Response (para. 4-12d)

rect. For the Slope Adjustments controlled time-mark generator

4- 16a. Sweep Amplitude Adjust

ment

4- 16b. Sweep Slope Adjustments

are

known tobe cor-

a

is

required.

at

At the

crystal-

-

If

4-1 5 ADJUSTING THE PRESET SENSITIVITY

OF

THE SWEEP GENERATOR

The PRESET position of the SWEEP MODE

control provides Sweep Start-Stop Trigger which gives stable triggering for almost

sensitivity of the Sawtooth Generator termined by the bias applied to the control grid of VlOA; the more positive the bias voltage, the larger the sync signal required to trigger V10. The SWEEP MODE control adjusts this bias, and in the PRESET position, supplies an optimum fixed bias voltage. To adjust the PRESET sensitivity, refer to Fig-

ure 4-6 and proceed

a

fixed sensitivity for the

all

sync signals. The

is

as

follows:

de-

4-16A SWEEP AMPLITUDE ADJUSTMENT

This adjustment

Sweep Amplitude Adj. potentiometer

a

give rect setting of this adjustment, and C40, the

0.2

ment, assures that zontal Amplifier will produce of Sweep deflection. refer to Figure 4-6 and proceed as follows:

a.

b. Connect a d-c voltmeter having an

4-18

sawtooth amplitude of

microsecond Sweep Amplitude adjust-

Remove the 150A from the cabinet; turn on and allow to warmup for five minutes.

is

made by adjusting the

-1

12

volts. Cor-

a

properly adjustedHori-

11

centimeters

To

make this adjustment,

R122

to

accuracy of 3% or better between pin 8 of V15 and ground.

c.

Set theSWEEP TIME/CMselector to the 1

SECOND/CM position; set the SWEEP

MODE control to ccwposition but not on PRE-

SET.

d. Record the voltmeter reading. This

a

reading may be

few volts positive or

negative.

e.

Set the SWEEP MODE control to FREE RUN.

f.

Observe the most negative voltage reading on the meter.

g.

If

necessary, adjust R122 to make this

voltage-1 12 volts more negative than the

reading in step d, h. Set theSWEEP TIME/CMselector to the

.2

microsecond range and adjust C40 to

11

obtain

4-168

cm deflection.

SWEEP SLOPE

ADJUSTMENT

centimeters apart re spec tively. Re turn

switch to "Xl".

If expanded sweep ranges are out

of

calibration, set HORIZ. SENSITIVITY to"X100" and adjust R213, mounted on Horizontal Amplifier

deck, to space pips exactly 5 centimeters

a-

part.

i.

Set marker generator for 1 millisecond

2

pips andSWEEP TIME/CM to".

SECOND".

The pips shouldbe exactly 5 centi-

MILLI-

meters apart.

Set SWEEP TIME/CM to

j.

I!.

5 MILLISEC-

OND". The pips should be exactly

centimeters apart. k. Set SWEEP TIME/CM to

Ill

MILLISEC-

OND". Adjust R145 to set pips exactly

1

centimeter apart.

Set marker generator for 10 millisecond

1.

pips.

2

I

I'

The Sweep Generator contains nine independent adjustments, R143, R144, R145, R157, C41, C59, C64, C65, and C67 which calibrate the sawtooth sweep for nine groups of ranges of the SWEEP TIME/CM selector. A tenth adjustment, C78 in the Horizontal Am-

is

plifier, position.

used only for the fastest sweep

To

make these adjustments, refer

to Figure 4-6 and proceed as follows: a.

Remove the 150A from the cabinet; turn on and allow to warm up for five minutes.

!I.

1

b. Set SWEEP/CM to

sweep VERNIER to "CAL.

MILLISECOND",

!I,

SYNC to "INT1*, SWEEP MODE to glPRESET1t, and HORIZ. SENSITIVITY to "X1".

Connect the output from

c.

a

marker gener-

ator to the oscilloscope vertical input. Set the marker generator for pips spaced

d.

100 microseconds apart.

Adjust oscilloscope vertical VOLTS/CM

e.

TRIGGER LEVEL, and TRIGGER SLOPE

a

controls to obtain

steady trace.

m. Switch SWEEP TIME/CM to

"2

SECONDS" and then "5 MILLISECONDS" which should produce pips spaced exactly 5 and

2

centimeters apart respectively.

n. Set SWEEP TIME/CM to"10MILLISEC-

ONDS" and adjust R144 to set pips exactly

1 centimeter apart.

0.

Set marker generator for 100 millisec-

onds

(0.

1

second) pips.

p. Switch SWEEP TIME/CM to

"20

SECONDS and .I50 MILLISECONDS which should produce pips spaced exactly 5 and 2 centimeters apart respectively.

9.

Set SWEEP TIME/CM to

'I.

1

and adjust R143 to set pips exactly

centimeter apart.

r.

Set marker generator for 1 second pips.

s.

,

Set SWEEP TIME/CM to

'I.

5 SECOND", and

'I.

2

SECOND",

"1

SECOND" which

should produce pips spaced exactly

1

centimeters apart respectively.

MILLI-

SECOND"

5,

2,

and

1

Adjust R157

f.

so

pips are exactly 1 centi-

meter apart. Set marker generator to 5 microseconds.

g.

h.

Set HORIZ. SENSITIVITY switch to ttX5", ntXIO", "X50ft, and "X100" which should

produce pips spaced 0.25, 0.5, 2.5, and 5

"2

t. Set SWEEP TIME/CM to

SECONDS"

and "5 SECONDS" which will produce pips and 5 pips per centimeter respectively.

u. Set SWEEP TIME/CM to

SECONDS

It,

HORIZ. SENSITIVITY to

"20

1'X5", and SWEEP MODE full clockwise to "FREE RUN".

4-19

2

MICRO-

v. Set marker generator for a 10 MC sine

wave. Adjust oscilloscope controls to obtain high.

w.

x. Set HORIZ. SENSITIVITY to

y, centimeter apart. If the sweep length

than

Z.

a

steady display 5 to 6 centimeters

Adjust C67

are 10 centimeters long.

Adjust C78 on the Horizontal Amplifier

deck to space marker pips exactly

10

centimeters.

Disconnect any input to oscilloscope

1. vertical amplifier or EXT. SYNC.

INPUT t e r m i nal

2.

Set SWEEP TIME/CM switch to MICROSECONDtt, sweep VERNIER

to CAL tlX1tl, and rotate SWEEP MODE control

full clockwise.

Set sweep length by adjusting C40 to

3.

obtain

meters long.

4. A test oscilloscope can be used to make

made in step to pin city probe and observe the sweep gener ator waveform. Adjust C40 just short of the position that produces distortion of the waveform point. Distortion, duce sweep "fold-over" sweep.

Set marker generator for a 5 MC sine wave.

so

two cycles of the sine wave

"Xl".

is

s

.

I(,

HORIZ. SENSITIVITY to

a

horizontal line 10.4 centi-

a

refinement of the adjustment

3.

Connect the oscilloscope

8

of tube V15 through a low capa-

at

the maximum negative

if

permitted, will pro-

at

the end of the

less

'I.

aa

To adjust sweeps:

1.

SetSWEEPTIME/CMto".

SECONDIIand adjustC65 to make 10 cycles of the sine wave long.

2.

Set marker generator for 1 micro-

second pips.

1

-

3.

Set SWEEP TIME/CM to

SECOND" and adjust C64

cycles from the marker generator are

10 centimeters long.

ab Set SWEEP TIME to

and set marker generator

second pips.

Adjust capacitor C6l to set pips exactly

ac

1 centimeter apart.

ad Set marker generator for

ond pips.

ae Set SWEEP TIME/CM to Io2MICROSEC-

ONDS"

will give pips spaced 5 and respectively.

af

Set SWEEP TIME/CM to SECONDS" and adjust C59

exactly 1 centimeter apart.

Set marker generator for 100 microsec-

ag

ond pips.

ah SetSWEEP TIME/CM to

ONDS" and "50 MICROSECONDS" which

should produce pips spaced exactly 5 and centimeters apart re spec tively.

.2

and .5 MICROSECOND

2

10

centimeters

I!.

5 MICRO-

so

"1

MICROSECOND"

for 1 micro-

10

microsec-

and "5 MICROSECONDS" which

2

centimeters

"10

tb

"20

MICROSEC-

MICRO-

that 5

MICROset pips

2

4-19A

MAIN VERTICAL AMPLIFIER

TOP DECK - BOTTOM VIEW

C8

MAIN VERTICAL AMPLIFIER

ADJUST FREQUENCY RESPONSE

(SEE

PARA.

4-17)

R5

MAIN VERTICAL AMPLIFIER

ADJUST GAIN

(SEE

PARA.

4-17)

\

@@@

I

BOTTOM DECK - TOP VIEW

\

FIGURE

4-7

4-20

4-17 ADJUSTING GAIN AND FREQUENCY RE-

SPONSE

The Gain setting of the Mainvertical Ampli-

fier

is

which standardizes the gain of the Main Ver tical Amplifier on the instrument chassis that any plug-in amplifier may be used inany 150A without losing deflection calibration.

The adjustment requires only an a-c voltmeter calibrated inrms volts. Thefrequency response adjustments are screwdriver-adjusted trimmer capacitors which are easily adjusted by observing on the oscilloscope screen plied to the oscilloscope input. To standardize the gain of the Main Vertical Amplifier, refer to Figure 4-7 and proceed

a.

Remove the 150A from the cabinet; turn on and allow to warm up for 5 minutes.

b. Connect the CALIBRATOR output to the

vertical INPUT connector on the plug-in amplifier being used. Synchronize the oscilloscope internally.

c. Connect an a-c voltmeter such

Model connections of the Main Vertical Amplifier. The voltmeter must be isolated from chassis ground to prevent shorting out one side of the

input signal d. Adjust the CALIBRATOR and the verti-

cal VOLTS/CM selector and VERNIER

to obtain volts. Note that anaverage reading voltmeter calibrated in rms volts of

1.65 volts for the 3-volt peak-to-peak square

wave used.

e.

If

necessary, adjust R5 to obtain an ex-

act 6-centimeter vertical deflection on

the oscilloscope graticule. Gain standardiza-

is

tion

sponse, proceed

f. Connect

0.1 usec to the vertical INPUT connector.

g.

complete. To set the frequency re-

ing

rise

If

necessary, adjust C8 to obtainthe

test square wave on the oscilloscope.

OF'

MAIN VERTICAL AMPLIFIER

a

simple potentiometer adjustment

a

100-KC and 1-MC square wave ap-

as

follows:

as

the

400

series to the push-pull input

.

a

voltmeter reading of exactly 1.65

a

sine wave reads

as

follows:

a

1 megacycle square wave hav-

and decay times not greater than

flat-

4-18 ADJUSTING MODEL 152A DUAL TRACE

AMPLIFIER

a.

Vertical Centering Adjustment.

b. Neutralizing Adjustments.

c. Output Frequency Response Adjustment.

-

d. Input Capacity Adjustment.

so

VOLTS/CM Range Switch Frequence Re-

e.

sponse Adjustments.

4-18A VERTICAL CENTERING ADJUSTMENTS

The Vertical centering adjustment affects both the A and B INPUTS

a.

Remove the air-filter element to gainac-

cess to the adjustments;

and allow to warm up for five minutes.

the SWEEP MODE control to free run to ob-

a

tain b.

c. Since any unbalance affects the position channel be balanced according to the proce-

@

dure given in the Operating Instructions, Figure 2-11.

d. Superimpose the two traces with the

channel set equally center of their adjustment range. Adjust R561

as

screen. e. If the VERTICAL POSITION knobs are

justment range there involving tubes V502, V503, V508 and V509. Such an unbalance may be corrected by inter-

changing or replacing these tubes. Repeat steps c and d.

straight line trace.

Set the VERTICAL PRESENTATION selector for ALTERNATE operation.

of the trace it

VERTICAL POSITION knob' for each

required to center the two traces on the

not both close to the center of their ad-

at

the same time.

turn on the 150A

is

imperative that each

on

opposite sides

is a relative unbalance

4-1 8B NEUTRALIZING ADJUSTMENTS

To prevent the higher frequencies from feed-

ing through the push-pull Output Amplifiers

when they are in

amplifiers must be neutralized. Neutraliea-

is

tion which age of put amplifiers of the channel which

accomplished with trimmer capacitors

are

adjusted while observing the leak-

a

10-megacycle signalthrough the out-

a

turned-off state, these

is

Set

of the

cut-off.

The Dual Trace Amplifier Unit has the following screwdriver adjustments:

To neutralize the output amplifiers, refer to

as

Fig. 4-8 and proceed

4-2

1

follows:

ADJUST CHANNEL

INPUT CAPACITY

(PARA. 4-18D)

DUAL TRACE AMPLIFIER

ADJUST 20VOLTWCM ADJUST IOVOLTS/CM ADJUST 5 VOLTS/CM

ADJUST

B

I

2

VOLTWCM

ADJUST 20VOLTS/CM ADJUST IOVOLTS/CM ADJUST

ADJUST 2 VOLTS/CM

5

VOLTS/CM

CHANNEL FREQUENCY RESPONSE

ADJUSTMENTS

(PARA. 4-18E)

ADJUST ADJUST

ADJUST

ADJUST .IVOLTS/CM

ADJUST NEUTRALIZATION

CHANNEL A

B

VOLTS/CM

I

VOLT/CM

.5

VOLTS/CM

.2

VOLTS/CM

OF

V503 IN

(PARA. 4-188)

I

{

I

I=

I

7

\

c549

TOP VIEW

ADJUST CHANNEL

I

INPUT CAPACITY

'

(PARA. 4-18D)

I

CHANNEL A VOLTS/CM FREQUENCY RESPONSE ADJUSTMENTS

(PARA. 4-18E)

I

ADJUST

ADJUST ADJUST .2VOLTS/CM

'

ADJUST

ADJUST NEUTRALIZATION CHANNEL

VOLT/CM

.5

VOLTWCM

.I

VOLTS/CM

OF

V509 IN

(PARA. 4-188)

B.

A

ADJUST FREQUENCY RESPONSE

(PARA. 4-18C)

-

V

BOTTOM VIEW

FIGURE

4-8

4-22

ADJUST VERTICAL

CENTERING

(PARA. 4-18A)

Remove the

a.

cess to the adjustments; turnon the 150A

and allow to warm up for 5 minutes.

Set the SWEEP TIME/CM selector to .5

b.

MICROSECOND/CM position; set the

SYNC selector to EXT. AC. c. Connect 10-megacycle sine wave signal

to INPUT A and to EXT. SYNC INPUT.

d. Adjust the VOLTS/CM selector to obtain

a

vertical deflection of 6 centimeters

then set the VOLTS/CM switch to the next

more sensitive range.

air-filter

element to gain ac-

SWEEP TIME/CM selector to the 5 MICRO-

SECOND position.

c. Using the AC-21A Probe connected to the

EXT. SYNC. INPUT, synchronize the

150A from the junction of R551, R552,

With the VERTICAL POSITION controls

d

.

center both traces. Connect the

e.

TOR output to INPUT A.

6.3

vac from the CALIBRA-

,

f.

Set the VOLTS/CM selector to obtain vertical deflection of 6 centimeters.

C529.

,

a

Set the VERTICAL PRESENTATION

e.

lector to B ONLY position.

f.

Simultaneously adjust C519 and C520 to

obtain oscilloscope trace. The two adjustment mers should now have nearly equal physical settings. If they do not habe nearly equal settings, the switched amplifier tube (V503 or V509) has an undesirable capacity unbal-

ance and should be replaced.

g. Repeat the above procedure for INPUT

B, connecting the 10 MC signal to INPUT

B,

setting the VERTICAL PRESENTATION

selector to the A ONLY position and adjust-

ing C550 and C551.

a

minimum residual signal on the

se-

trim-

4-18C OUTPUT FREQUENCY RESPONSE

ADJUSTMENT

To compensate for circuit loading by the in-

s

is

to main-

is

V510A

ap-

put capacity of output cathode follower

and B, the grid circuits contain resistancecapacity voltage dividers which utilize the input capacity of the Output Cathode Followers as

part of the dividers. The effect

a

tain the full frequency range.

The time constant of this adjustment

proximately 1.5 microseconds.

To adjust Output Frequency Response trim-

mers

and proceed

constant signal voltage division over

C530 and C531, refer to Figure 4-8,

as

follows:

Adjust C530 and C531 to obtain the flattest

g.

and most stationary Channel

h. To assure that the best transient response

is

obtained, apply kilocycle square wave to either Vertical Input. Adjust scope presentation for conveni-

ent viewing.

i.

If necessary, refine the adjustment of C530 and C531 equally to obtain flattest

top on square wave.

4-1

8D

VERTICAL INPUT CAPACITY

a

high-quality

B

trace.

100-

ADJUSTMENT

The input capacities of the vertical and horizontal input circuits in scopes have been made adjustable

all

can be made equal. A probe that

justed for one input

all

for ponent in the input circuit be necessary to reset the input capacity to the

standard amount. To standardize an input

capacity requires one input circuit which known to be which has been adjusted to this input, see

Fig. 2-8. To standardize the vertical input

capacities, refer to Fig. 4-8 and proceed as follows?

a.

b.

other inputs.

correctly adjusted and

Turn on the 150A and allow

up for five minutes. Connect the standardizedprobe to INPUT

A and to the CALIBRATOR output.

@

Model 150A oscillo-

so

that they

is

then correctly adjusted

If

a

tube or other com-

is

changed,

a

it

to warm

is

ad-

it

may

probe

is

Remove the

a.

cess to the adjustments; turnon the 150A

and allow to warm up for five minutes.

Set the VERTICAL PRESSNTATION se-

b.

lector for CHOPPED operation;

air-filter

element to gain ac-

set

the

Set thePOLARITY selector to POS.

c.

the VOLTS/CM selector to .05 and the

SYNC selector to INT.

Adjust C517 to obtain the flattest top on

d.

1

KC square wave.

the

4-23

UP,

e. Set the POLARITY selector to NEG.

and adjust C518 to obtain the flattest top

on the square wave. f.

To adjust INPUT ardized probe to INPUT

C548 for

4-1

8E

POS.

VOLTS/CM

UP

B,

connect the stand-

B

and adjust

and C549 for NEG.

SELECTOR FREQUENCY

UP

UP.

RESPONSE ADJUSTMENTS

Each VOLTS/CM range switch consists of independent resistance -capacity voltage dividers, each section having two adjustments. One capacitor in each dividing network justable to obtain balanced resistance -capacity values and provides constant voltage division over the full frequency range. The other capacitor keeps the input capacity constant. The values of resistance and capacity in the switch are such that the adjustments can be made at relatively low frequencies and the output of the internal CALIBRATOR can be used. These adjustments are dependent upon the correct adjustment of the Vertical Input Capacity(see para. 4-18d). To ad-

just the frequency response of

the VOLTS/CM range switch, proceed follows:

a.

Turn on the 150A and allow to warm up

for five minutes.

b. Connect the CALIBRATOR OUTPUT to

the VERTICAL INPUT of the channel to

be adjusted by means

c. Set the VOLT/CM selector to the range

indicated in the following chart and ad-

just the CALIBRATOR for

sentation on the oscilloscope screen. Make the indicated adjustments for best squarewave response.

of

a

standardizedprobe.

all

a

convenient pre-

is

ad-

ranges of

as

NOTE

Model 152A requires two Plug-in

(@

Extenders

so

95L) ated partially withdrawn from the

150A to gain access to some of the

adjustments.

f~

LTS

RANG E

.1

.2

.5

1

2

5

10

20

that the 152A can be oper-

/

CM

stock number 150A-

CHANNEL A

ADJS.

C503 c534

C504 c535

C505 C511

C506 C512

C507 C513

C508 C514

C509 C515

C510 C516

CHANNEL

B

ADJS.

C569 C590

C570 C591

C571 c577

C572 C578

c573 c579

c574 C580

c575 C581

C576 C582

4-24

SC HEMATIC DIAGRAM NOTES

Heavy solid line shows main signal path; heavy dashed line shows control, sec-

1.

ondary signal, or feedback path. Heavy box indicates front-panel engraving; light box indicates chassis marking.

2.

Arrows on potentiometers indicate clockwise rotation as viewed from the round

3.

shaft end, counterclockwise from the rectangular shaft end.

4.

Resistance values in ohms, inductance in microhenries, and capacitance

micromicrofarads unless otherwise specified.

Rotary switch schematics are electrical representations; for exact switching

5,

details refer to the switch assembly drawings. Relays shown in condition prevailing during normal instrument operation.

6.

VOLTAGE AND RESISTANCE DIAGRAM NOTES

in

Each tube socket terminal

1. and pin number,

*

H

K

G = control grid

Sc

-

Sp

The numerical subscript to tube-element designators indicates the section of multiple-section tube; the letter subscript to tube-element designators indicates the functional difference between like elements in the same tube section.

socket terminal with an asterisk may be used

A voltage and resistance shown.

Voltages values shown are for guidance;

2.

due to tube aging or normal differences between instruments. Resistance values may vary considerably from those shown when the circuit contains potentiometer crystal diodes, or electrolytic capacitors.

Voltage measured

3.

line; measurements made with an electronic multimeter, from terminal to chassis ground unless otherwise noted.

A solid line between socket terminals indicates a connection external to the tube

4.

between the terminals;

inside the tube. Voltage and resistance

terminals.

as

follows:

no tube element heater T = target (plate) cathode R = reflector or repeller

screen grid suppressor grid Sh shield

at

is

numbered and lettered to indicate the tube element

P

plate

A

=

anode (plate)

S

-

spade

NC

-

no external connection to socket

as

a

tie point and may have

values may vary from those shown

the terminal

a

dotted line between terminals indicates a connection

is

shown above the line, resistance below the

are

given

at

only one of the two joined

a

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SECTION

V

TABLE

Any changes in the Table of Replaceable Parts will be

listed

manual.

When ordering parts from the factory always include the following information:

on

a

Production Change sheet at the front of this

OF

REPLACEABLE PARTS

Instrument model number Serial number

-hp- stock number

Description of part

of

part

TABLE

OF

REPLACEABLE PARTS

Circuit

Ref.

c1

c2

c3 c4

C5, C6 c7

C8

c9

c10

c11

c12,c13,c14

Deec ription

MAIN VERTICAL AMPLIFIER

Capacitor: selected values; replace in sets

Capacitor: fixed, titanium dioxide dielectric,

.47 p.p Capacitor: aelected values; replace in sets Capacitor: fixed, titanium dioxide dielectric,

.47 yyf, +5%, 500 vdcw Capacitors: selected values; replace in sets Capacitor: fixed, ceramic disc,

-02

Capacitor: variable, ceramic,

trimmer, 5-25cylf

Capacitor: fixed, mica, 47

Capacitor: fixed, titanium dioxide dielectric,

3.9 yy

Capacitor: fixed, mylar dielectric,

.

These circuit references not assigned

f,

+570,

500 vdcw

p.

f.

tol.

+loo%

f,

+lo%,

1

yf, +5%, 200 vdcw

500 vdcw

-O%,

wf,

600 vdcw

25%, 300 vdcw

Stock

150A

-9

15-74

150A-95D 15-74

1

5 OA

-9

5D

15-85

13-28

14-74 15-126

16-103

5D

@

No,

Mfr. * &Mfre.

Derignation

HP DD

Type GA

HP DD

Type GA HP

R.

M.

C.

Type B

L

Style

557-23

V,

TypePQ

Goodall

620M10452

DL lA, DL 1B

L1. L2

L4

L3, P2

R

1A

R2, R3

R4

R5 X6, R7

X8A

%8B

Delay Line Cable

Bridged "T" Coil Assembly:

Coil, R.F., 9yh

Plug, male, nova1

Resistor: fixed, metal film on glass body,

2.2K ohms,

Re

sis

tor: fixed, compos ition,

47 ohms,

Resistor: fixed, deposited carbon,

180,000 ohms, k170, 112 Resistor: variable, 100 ohms, Resistor: fixed, metal film on glass body,

5000 ohms, f570, 5

Resistor: fixed, metal film on glass body,

2. ZK ohms,

Pair:

+1%,

tlO70,

+I%,

112

4

2200

W

ohms

2400 ohms

W

+20%,

.2W

1

50A- 16J

150A-60C

L

50A-60D

L

50A-95F

134-2.ZK

!3-47

13-180K

!

10- 166

13 5-5K-5

;34-2.2K

HP

HP HP HP AB

Type S30

B EB 4701

NN

DC-l/ZC BO, Type 70

AB

LP-5

AB

Type S30

*

See Liat

of

Manuiacturerr

Code

Letter0

for

Replaaeable

5 -2

Parttp

Table

'.

circuit

Ref.

~ ~~

MAIN

TABLE

VERTICAL

OF

REPLACEABLE PARTS

AMPLIFIER

(CONT~D.

R9,RlO,R11

R12A

R13A

R14

R15

R16, R17

R18

R19,

R20

R21,

R22

Resistor: fixed, deposited carbon,

180,000

Resistor: fixed, carbon film on ceramic body,

2.2K

Resistor: fixed, carbon film on ceramic body,

2.2K

Resistor: fixed, wirewound,

lOOOohms,

Resin tor

47

Re

ais

tor : fixed, composition,

4700

Re

s i s

tor: fixed, compos it ion

47

Resistor: fixed, composition,

4700

Resistor: fixed, composition,

47

ohms,

*l%,

*1SD

*lW,

:

f

ked, compooition,

ohms,

*lo%,

*l%,

1/4

1/2

1OW

W

1

W

1

W

1/2

W

,

3 3 - 180K

30-2.2K

26-17

23-47

24-4700

23-47

24-4700

23-47

NN

DC

-

1

NN

DC-1/4

NN

DC-1/4

I

A-IO-F

B EB

4701

B

4721

GB B

4701

EB B

4721

GB B

EB

4701

/2C

R23

R24, R25

R26

R27, R28

R29

230, R31

232, R33

234

23 5

Resistor: fixed, composition,

470

ohms,

Resistor: fixed, metal film on glass body,

2000

Resistor: fixed, composition,

470

ohms,

Resistor: fixed, metal film on glass body,

400

ohms,

Resistor: fixed, metal film on glass body,

400

ohms,

Resistor: fixed, composition,

470

ohms,

Resistor: fixed, metal film on

2000

Resistor: fixed, composition,

10

megohms,

Resistor: fixed,

ohm,

ohms,

f5%, 1/2

f5%, 7

f5%, 1/2

*5%,

3

w

f5%, 3

*5%, 1/2

W

f5%, 7

*lo%,

3.3

megohms,

W

1/2

glass

W

body,

*lo%,

1/2W

23-470-5

337-2K-5

23-470-5

333-400-5

E

3 -470- 5

3

37-2K- 5

23-10M

t3-3.3M

B

4715

EB

AB

LP-7

B

4715

EB AB

LP-3

AB

LP-3

B

4715

EB

AB

LP-7

B EB

1061

B, EB

1355

5 -3

TABLE

OF

REPLACEABLE PARTS

Circuit

Ref.

R3 6

R37

R38

R39

R4

0

R4

1

R43

v1,

v2

v3, v4 V5, V6

Description

Resistor: fixed, composition,

47

ohms,

Resistor: fixed, composition,

2200

Resistor: fixed, composition,

130

Resistor: fixed, compos ition,

47

ohms,

Resistor: fixed, metal film on glass body,

6500

This circuit reference not assigned

Re

sis

tor : fixed, compos it ion,

22

ohms,

Tube:

Tube: Tube:

6197

6BQ7A 6197

ohms,

or

+lo%,

1/2

+lo%,

?570, 1/2

+lO7’0,

?lO~o,

1/2

f5%, 3

1/2

6CL6

W

1

W

Stock

23-47

24-2200

23-130-5

23-47

333-6500-5

23-22

212-6197 2 12 -6C L6

212-6BQ7A 212-6197

2 12 -6C L6

@

No.

or

Mfr.

*

&Mfre.

Designation

B

EB 4701

B GB 2221

B

EB 1315

B

EB 4701

AB

LP-3

B

EB 2201

zz

ZZ

zz

v7 KV1, xv2,

xv3, xv4, xv5, xv6,

xv

7

Tube:

Socket, tube,

6AU8

nova1

2 12-6AU8

120-10

ZZ

H,

44F-16388

*See

IiLiot

of

Manuiaeturera

Cede

Letera

fer

Rslplaaeabla

5

-4

Parts

Table ff.

TABLE

OF

REPLACEABLE PARTS

c21

c22

C23

C24

C25 C26 C27

c28

C29 C30 C31

Circuit

Ref.

Description

SWEEP GENERATOR

pp

Capacitor: fixed, mica, 820

flO70,

Capacitor: fixed, mylar dielectric,

.Ol

Capacitor: fixed, mica,

820

Capacitor: fixed, ceramic dielectric,

-01 Capacitor: fixed, mica, 39 This circuit reference not assigned Capacitor: fixed, ceramic .dielectric,

.Ol

Capacitor: fixed, ceramic dielectric,

10

Capacitor: fixed, mica, 22 Capacitor: fixed, mica, Capacitor: fixed, silver mica,

820

500 vdcw

p

f,

f5%, 400 vdcw

pp

f,

p

f,

tol. tl0070,

pf,

tol. tl0070,

pp

f,

fO.

pp

f,

+lo%,

k570, 500 vdcw

5

pp

500 vdcw

-070,

f,

NPO temp. coeff. 500vdc

lOppf,

f.

1000 vdcw

pp

f,

1000 vdcw

pp

f,

?EL%,

?lo%,

f570, 300 vdcw

300

vdcv

500 vdcw

Stock

14-28

16-101

14-28

15-43

14-70

--e--

15-43

15-30

14-69 14-10 15-104

@J

No.

Mir. * &Mire.

Deeignation

V

Type OXM

Goodall

6 20M 103 54

V

Type OXM

K

Type BPD

V,

Type PQ

.01

K

Type BPD . 01

K

Type

GI-1

V,

Type RQ

V,

Type

OXM

z

KR-1382

C32

c3-3

c34

c35

C36

c37

c38

c39

240

;41, C42

Capacitor: fixed, mica,

100Wf, k570, 300 vdcw

Capacitor: fixed, ceramic dielectric,

.Ol

pff.

tol. tl0070,

Capacitor: fixed, titanium dioxide,

8.2

pp

f,

fl0’70, 500 vdcw

Capacitor: fixed, silver mica,

Capacitor: fixed, ceramic dielectric,

Capacitor: fixed, titanium dioxide dielectric,

Capacitor: fixed, paper dielectric,

Zapacitor: variable, ceramic, with slotted

l’hese circuit references not assigned

pp

f,

200

820

.

01

3.9

.

1

pf,

head shaft, 8-50

+5%, 500 vdcw

pp

f,

+570, 500 vdcw

pf,

tol.

p.p

f,

?lo%,

?lO7o,

tlOO?’o,

400 vdcw

-070,

500 vdcw

pp

f,

N750 temp. coeff.

1000 vdcw

14-76

15-43

15-123

15-103

15-104

15-43

15-126

16-35

L3-23

V Type PQ

K

Type BPD . 01 DD

Type GA

z

DR-1320

Z

~~-1382

K

Type BPD

DD

Type GA

.Ol

cc

109P 10494

L

Style 557

-----

*Ow

”Ut

of

Xmufroturrrr

Cod~

L&rr

lor

Raplraenblo

5-5

Partr

Table’.

Circuit

;43

;44

Ref.

TABLE

OF

REPLACEABLE PARTS

Description

SWEEP GENERATOR (CONT'D.

Zapacitor: fixe&, ceramic dielectric,

.

01

pf,

tol.

+loo%,

Zapacitor: fixed, titanium dioxide,

2.2

p

f,

+lOVo,

-070,

500 vdcw

1000 vdcw

Mfr.

*

@

Stock

No.

)

5-43

5-52

K

Type BPD .01 DD

GA-4

&Mfrs.

Designation

345

Z46, C47

Z48

349, CSO 351

352

3 53

3

54

c55

C56

c

57

C 58

c

59

C60

Zapacitor: fixed, ceramic disc.

.02

pf,

tol.

+loo%,

:

Zapacitor

.Ol

Zapacitor:

+O.

rhese circuit references not assigned. Zapacitor: fixed, paper dielectric,

.47

Zapacitor: fixed, paper dielectric,

.051 3apacitor: fixed, mica, 4700pp Zapacitor: fixed, mica, 4700pp

3apacitor: fixed, mylar dielectric,

1

Sapacitor: fixed, mylar dielectric,

.

Capacitor: fixed, mylar dielectric,

0.01

Capacitor: fixed, silver mica,

.

Capacitor: variable, ceramic, dielectric Capacitor: fixed, ceramic dielectric,

82

fixed, ceramic dielectric

p

f,

tol. tl0070,

fixed, ceramic dielectric, 10

5

pp

f,

NPO temp. coeff., 500 vdcw

p

f,

+loyo,

p

f,

+lo%,

pf,

5570,

200

1

pf,

+570, 200 vdcw

p

f,

+570,

001

pf,

5570, 500 vdcw

pp

f,

?570,

-070,

200 vdcw

vdcw

400 vdcw

500

vdcw

600 vdcw

,

1000 vdcw

f,

+l070,

f,

+lo%,

pp

f,

500vdcv

500vdci

7-

4

5p,

p

5-85

5-43

5-30

.6-84

.4-44

.4-62

16-102

16-103

16-101

15-57

13-1

15-7

G

DD-203

K

Type BPD . 01

K

Type CI-1

cc

109P47492A

Z

Type 33

Z,

C-1247

V,

Type

CM20B471K Goodall

621M10552

Goodall

620M10452 Goodall

620M 103 54

A

1464TT

L,

L

NPO 333

"Ott

TS2A

C61 C62

C63

C

64

C65

C66

*

See "List

as

Same

Capacitor: fixed, ceramic dielectric,

Capacitor: fixed, mica,

Capacitor: variable, trimmer,

Capacitor: fixed, ceramic dielectr-2,

of

Manufacturers Code Letters

C59

pp

f,

82

22w, ?570, 300 vdcw

ceramic, 5-25cLFLf

ceramic, 3-12F4Lf

5~f, ?0.514Lf, 500 vdcw

2570, 500 vdcw

for

Replaceable

5 -6

15-7

14-69

13-28 1A

13-29

15-29

Parts

38A

Table".

L

NPO 333

V

Type

PC2

L

Style 557-23

L

Style 557-23

K

CI-

1

35

TABLE

OF

REPLACEABLE PARTS

Circuit

Ref.

C67

CR3 CR4

CR7 CR8

11, I2 13,14,15,

Description

Capacitor: variable, trimmer,

ceramic, 1.5 Crystal, rectifier, selected Crystal, rectifier, germanium diode

1N38A Crystal, rectifier Crystal, rectifier, germanium diode

Neon, selected: (red coding) Neon, selected: (blue coding)

I6

NOTE:

11,

12, 13, 14, 15; these neon lamps are polarized and must be installed with the painted side connected to the positive voltage.

-

7wf

Stock

13-27

212-G11A 2 12

-

1N38A

212-GllA 212-G12

G-84E C-84B

@J

No.

Mfr. * &Mfrs.

Designation

L

Style 557-23

BU,

HD-2135

EE 1N38A

BU,

HD2135

Transitron

1N116 selected

HP

*See

"List

of

Manufacturers Code Letters

for

Replaceable

5-6A

Parte

Table'.

TABLE

OF

REPLACEABLE PARTS

Circuit

Ref.

I7 18

19

I12 J3

54 J8, J9, J10 L8 L10, L11 L12 L13 L14 R51, €252

~~

SWEEP GENERATOR (CONT'D.

NE

2 neon, selected, 1/25

Neon, selected: (green coding)

Same as I7

Lamp, incandescent, 6V., 1 C.

Consists of:

Binding post, red (1) Binding post, black (1) Insulator (2)

Connector: BNC

Socket, electric tube, 9 pin, miniature type

Coil, choke, lOph, Coil, R. Coil, Coil, Coil,

Resistor: fixed, composition,

R.F.,

R.

R.F.,

680,

F.,

F.

000

,

Desc rbtion

w

+loyo,

35 210% p h

100ph

270 p h

20ph

ohms, 21070, 1/2

layer wound

)

P.

W

Stock

G-84B G-84D

211-170

G-1OD G-1OC G-83A

125-9 G-76D 48-54 48-42

1 50A -6 OA 150A-60G 150A-60E

23-680K

@

No.

Mfr. * &Mfrs.

Designation

HP HP

0,

Type 51

HP HP

HP

LL, 5126 EE, 7490-0070 CG, 217-21

1035-15

CG, HP HP

HP B

EB -841

R53

R54

R55

R56

R57 R58

R59

R60

R61, R62

R63

R64, R65

Resistor: fixed, composition,

270,000 ohms,

Resistor: fixed, composition,

220,000 ohms,

Resistor: fixed, composition,

1 megohm,

Resistor: fixed, composition,

2.2 megohms, See 214 Resistor: fixed, compos ition,

47,000 ohms,

Resistor: fixed, composition,

470,000 ohms,

Resistor: fixed, composition,

56 ohms,

Resistor: fixed, composition,

2200 ohms, 21070, 1

Resistor: fixed, non-inductive metal film on

glass rod body,

Resistor: fixed, composition,

56 ohms,

+lo%,

+loyo,

+lo%,

+loyo,

ClOO/o,

tlO"/o,

1/2

W

20,000

1/2

W

1/2

W

1/2

ohms,

W

+lo%,

4

W

23-270K

23-220K

23-1M

23-2. 2M

23-47K

23-470K

23-56

24-2200

3 34- 20K

23-56

B EB 2741

B EB 2241

B EB 1051

B EB 2251

B EB 4731

B

EB 4741

B

EB 5601

B GB 2201

AB

LP-4

B

EB 5601

*See "List of Manufacturers Code Letters for Replaceable

5-7

Parts

I

Ta.ble".

Circuit

Ref.

TABLE

OF

REPLACEABLE PARTS

Description

SWEEP GENERATOR (CONT’D.)

Stock

@

No.

Mfr.

*

&Mfrs.

Desimation

R66

R67 R68

R69

R70

R7 1

R72

R73, R74 R.7 5

R76

R77

R78

Re

si

s

tor: variable, compos ition, linear taper

2000 ohms, +30%, 113 This circuit reference not assigned. Resistor: fixed, composition,

1800 ohms,

Resistor: fixed, non-inductive me tal film type

on glass rod body, 10,000 ohms, +570, 4 Resistor: fixed, deposited carbon,

200,000 ohms, +5%, 1/2 Resistor: fixed, deposited carbon,

526,000 ohms, +1%. 1

Resistor: variable, composition, linear taper,

This circuit reference not assigned Resistor: fixed, metal film on glass body,

Resistor: fixed, glass body,

Resistor: fixed, composition,

000

100,

6500 ohms, f5%, 3

10,000 ohms, f5%,

100 ohms,

56 ohms,

+lo%,

ohms, +300/, 1/4

+lo%,

1/2

W

3

W

!lo-133

__---

?3-1800

334-10K

33-200K

31-526K

210-138

-----

333-6500-5

333-10K-5

23-100

23-56

BO UPE-70 special

B EB 1821

AB

LP-4 NN

DC-1/2 A

NN

DC-1 BO

UPE-70 special

-----

AB

LP-3

AB

LP-3 B

EB 1011 B

EB 5601

R79, R80

R8

1

R8 2

R8 3

R84

R8 5

R8 6

R8 7

R88

Resistor: fixed, deposited carbon,

37,000 ohms, +1%, 1

Resistor: fixed, composition,

56 ohms,

Resistor: fixed, compos ition,

1000 ohms,

Resistor: fixed, deposited carbon,

37,000 ohms, +1%, 1

‘Resistor: fixed, composition,

68,000 ohms, f5%, 1

Resistor: fixed, compos ition,

560,000 ohms,

Resistor: fixed, composition,

180.000 ohms,

Re si s tor : fixed, compos ition,

56 ohms,

This circuit reference not assigned

+lO~o,

+lo%,

1/2

W

1/2

+lo%,

1/2

W

w

1 /2

1/2

W

*See “List of Manufacturers Code Letters for Replaceable

3

23-56

23-1000

3 1 -37K

24-68K-5

23-560K

23-180K

23-56

-__--

Parts

1 -37K

Table‘‘.

NN

DC-1 B

EB 5601 B

EB lo21

NN

DC-1 B

GB 6835

B

EB 5641

B

EB 1841

B

EB 5601

-----

5 -8

HP 152A, 150A Service manual [en, fr]