HP 13OB, 13OBR Service Manual

@

OPERATING AND

MODEL

SERIALS

OSCILLOSCOPE

SERVICE

13OB/BR

PREFIXED:

201

MANUAL

)

00013-3

Copyright HEWLETT-PACKARD COMPANY

1501

PAGE

MILL

ROAD, PAL0 ALTO, CALIFORNIA,

U.

1959

S.

A.

Printed:

JAN

1862

Model 130B

Table of Contents

List

of

Illustrations

)

TABLE

Section Page

I

GENERAL DESCRIPTION

1 . 1

.

General

1.2 . Damage in Transit

1.3

.

Power Line Voltages

1.4 . Power Cord

1.5 . Installation

1.6 . Cathode Ray

I1

OPERATINGINSTRUCTIONS

2.1

.

Controls and Terminals

2.2

.

Rear-Access Terminals

2.3

.

Warm-up Drift

2.4

.

AC

2.5

.

Balanced Inputs

2.6

.

Operating Procedures

111

THEORY OF OPERATION

3-

1

.

General Content

3.2 . Over-All Operation

3.3

.

Vertical Amplification Channel

3.4 . Horizontal Amplification

3.5

.

Sweep Generator

3.6

.

Low Voltage Power Supply

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

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

of

Tube

or

DC Coupling

Channel

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

........

.........

.......

Rack Mount

Warranty

.....

....

......

..........

........

..........

.......

........

..........

........

.........

....

. .

1-1

1 . 1 1-1 1 . 1 1-1 1-1

1-2

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

3-1

3-

3-1

3-1 3-2

3-2

3-3

OF

CONTENTS

Section

111

THEORY OF OPERATION (cont’d)

3.7

.

3.8

.

IV MAINTENANCE

4-

1

.

4.2

.

4.3 . Removing the Cabinet

4.4

.

4.5 . Connecting

4.6 . Tube Replacement

4.7

.

4.8 . Adjustment Procedure

4.9 . Turn On 4-

10

4.11

4.12 . Checking and Adjusting the

1

4.13 . Adjusting the Vertical Amplifier 4- 14 . Adjusting the Horizontal Amplifier

4.15

4.16 . Adjusting Preset

4.16 . Adjusting the Sawtooth Generator

High Voltage Power Supply Calibrator

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

Introduction Simple Check Procedure

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

.......

Isolating Troubles to Major

Sections

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

for

230Volt

Operation

........

Condensed

Procedures

Test

and Adjustment

..........

......

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

.

Power Supplies

.

ReplacingandAdjustingthe

Calibrator

.

Phase Shift Adjust

..........

...........

........

.........

and Sweep Amplifier

......

Page

....

.....

.

CRT

.

3-4 3-4

4-1 4-1 4-1 4-3

4-3 4-3

4-4 4-5

4-9 4-9 4-9 4-11

4-13 4-13 4-15 4-15 4-17

4-17

1

/

i

/

LIST

OF

Number Page

1.1

.

Model 130B/BR Oscilloscope

1

.

2

.

Cathode Ray Tube Warranty

1.3

.

Model Operating Controls and Terminals

2.1

.

Vertical Balance Adjustment

2.2

.

Horizontal Balance Adjustment

2.3

.

2.4

.

Internal Sweep. Internal Sweep.

2.5

.

External Horizontal Input

2.6

.

AC Coupling Balanced Input

2.7

.

Connection to CRT Deflection Plates

2.8

.

External Intensity Modulation

2.9

.

Aligning ScopeTracewithGraticule

2.10

3.1

.

4.1

.

Location Diagram

4.2

.

Line Voltage Connection

4.3

.

Power Supply Location Diagram

4.4 . Servicing Etched Circuit Boards

4.1 . Condensed

4.2

.

Tube Replacement Chart

00013-2

130BR

Internal Synchronization External Synchronization

130B

Procedures

Installation

Diagram

for

Major Circuits

Test

and Adjustment 4.3 . Regulated Power SupplyTolerances

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

.....

......

........

...

......

....

.......

......

.......

......

.

.....

.

......

.

.......

....

LIST

........

1-0

1

.

2

1-3

2-0 2-3 2-4

2-5 2-6

2-7 2-8 2-9 2-10 2-11 4.15 . Power Supply Regulator.

3-0

4-2 4.17 . Filament and Primary Detail. 4-4 Schematic Diagram 4-29 4-8 4.18 . Sweep Time/CM Switch.

OF

4-6 4-7 5.2 . Table

ILLUSTRATIONS

Number Page

.

4.5

4.6

4.7

4.8

4.9

4.10

4.11

4.12

4.13

4.14

4.16 . Power Supply. Schematic

Vertical Amplifier Adjustment

Locations

.

Horizontal Amplifier Adjustment

Locations

.

SweepGenerator Adjustment Locations . 4-16

.

Vertical Amplifier.

Voltage Resistance Diagram

.

Vertical Amplifier. Schematic

.

Horizontal Amplifier.

Voltage Resistance Diagram

.

Horizontal Amplifier. Schematic

.

Sweep Generator.

Voltage Resistance Diagram

.

Sweep Generator. Schematic Sweep Time/CM Switch

.

Voltage Resistance Diagram

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

.....

....

.....

......

.........

.....

........

..........

Assembly Diagram

TABLES

5.1

.

Reference Designator

of

Replaceable Parts

..........

. .

..........

.......

4-12 4-14

4-20 4-21

4-22 4-23

4-24 4-25 4-26

4-27 4-28

4-30

4-9

5-2

5-13

iii

SPECIFICATIONS

Model

130B

SWEEP Sweep Range:

0.2

,usec/cm to at least

ibrated sweeps, accurate within

1-2-5-10

Vernier permits continuous adjustment of sweep time between calibrated steps and extends slowest sweep time to at least

Magnifier:

X5

Magnifier may

expands fastest sweep to

curacy within

Synchronization:

Internally from line voltage or from signals causing

sequence, 1 ,usec/cm to 5 sec/cm.

10%.

1/2

centimeter or more vertical deflec-

tion.

or more.

Trigger Point:

Continuously adjustable from approximately

-30

to

+30

volts on either positive or negative

slope of external synchronizing signal, or from

any point of the vertical signal presented on the

screen.

Preset Triggering:

Switch position on sweep mode control selects optimum setting for automatic triggering.

INPUT AMPLIFIERS

Vertical and horizontal amulifier characteristics.

Sensitivity:

1

mv/cm to at least ranges, accurate within sequence, 1 mv/cm to mits continuous adjustment between ranges and

decreases sensitivity of least

125

volts/cm. Input voltage rating

volts dc or rms.

12.5

sec/cm.

12.5

be

used on all ranges and

0.2

pec/cm.

from

5

125

v/cm.

*5%,

50

v/cm. Vernier per-

50

Peakmto-peak impedance 2 megohms, approximately

s

15

in a

v/cm range to at

21

fs%,

sec/cm.

have' same

calibrated

1-2-5-10

calin a

Ac-

600

Phase Shift:

Within up to lifiers with verniers in cal.

Stability:

1

Bandwidth

DC

to of sensitivity setting.

Balanced Input:

On

Mount

with approximately

f

lo

relative phase shift at frequencies

50

kc

between vertical and horizontal amp-

mv/hr after warmup.

Coupling: dc to

300

kc.

Specified bandwidth

1,2,5,10,20

input

impedance: megohms shunted

and

300

50

25

kc.

AC Coupling: 2 cps

is

independent

mv/cm ranges. Cabinet

pf. Rack Mount input

125

shunt capacity. Disconnecting the front panel which connect to the reduces the input capacity to approximately

25

pf.

Common Signal Rejection: (Balanced input only):

Rejection at least not exceed

Single Ended Input:

Cabinet Mount input impedance: shunted with approximately

input impedance: pf shunt capacity. Disconnecting the the front panel connecting to the rear terminals reduces the input capacity to approximately

50

pf.

Internal Calibrator:

300

millivolts peak-to-peak squarewave applied to vertical or horizontal amplifiers

1.5

by

40

volts.

1

megohm, approximately

CAL position of input attenuators.

Common signal must

db.

50

wires

rear

terminals

1

megohm

pf. Rack Mount

wires

f

2%,

300

cycles

pf

at the

200

at

iv

00013-2

Model

130B

SPECIFICATIONS

GENERAL

External Graticule (Standard):

Edge lighted graticule with controlled illumination, 10 cm

x

10 cm, marked

in

centimeter squares with 2 mm subdivisions, on major horizontal and vertical axes.

Internal Graticule (Optional):

10 cm x 10 cm, major horizontal.

CRT Plates:

Direct connection to deflection plates via minals on rear. Sensitivity approximately 20 volts/cm.

Intensity Modulation:

Terminals on

rear;

20 volts positive signal

blanks CRT at normal intensity.

Dimensions:

Cabinet Mount: 9-3/4 in. wide, 15 in. high,

Rack

21-1/4

Mount:

in.

deep.

ter-

(CONT’D.)

Weight:

Cabinet Mount:

Rack

Mount:

lbs, shipping

Net 47 lbs, shipping 62 lbs.

54

Net

41

Cathode Ray Tube:

5

AQP mono-accelerator flat face type with 3000 volt accelerating potential. Available with P1, P2, P7 or P11 screen.

Power Supply:

115/230 volts

lo%, 50/1000 cycles, 160 watts.

Filter Supplied:

Color of filter compatible with screen phosphor. Green for P1 and P2, Amber for P7, Blue for P11.

Rack Mount:

Has

rear

terminals in parallel with front panel.

connections.

Accessories Furnished:

Supplied with

Rack

Mount.

130B-12P and Q Mounting Brackets (pair).

Two 125-57 Plugs (mate with

rear

terminals).

Two 125-59 Clamps for 125-57 Plugs.

lbs.

Accessories Available:

AC-83A Viewing Hood; face-fitting molded

TOP

rubber. Price Additional Mounting Brackets. 130B-12P (left)

$5.00.

and 130B-12Q (right)’; $2.50 a pair.

Price:

Model 130B, Cabinet Mount: $650.00 Model 130BR, Rack Mount: $650.00

Opt ions

:

2. P-2 CRT (installed)

3. Internal graticule CRT (installed)

7. P

-

6

i

J

1-19-1

Ik

130

BR

11.

7 CRT (installed)

P-11 CRT (installed)

00013-2

V

Sect. I Page0

Model 130B

)

Figure

1-1.

Model 13OB/BR Oscilloscope

00013-2

,I

Model

130B

Sect.1

Page

1

i

1-1

GENERAL

The Hewlett-Packard Model 130B Oscilloscope

general purpose oscilloscope. either internal either internally

it

can

be type mounting. Because balanced input, the Model 130B may often

directly with transducers, enabling you direct

having

Some of the

are

A.

tained from

insures type of sweep generator, independent of sweep generator.

B.

sients by expanding the

detail.

all

sweep time

C. CALIBRATED AMPLIFIERS

are

*5%.

in ization

Phase shift measurements can with this oscilloscope over frequencies.

00013-2

presentation of phenomena

to

resort

as

follows:

LINEAR INTEGRATOR SWEEP GENERATOR The accurate direct reading sweeps

a

X5 SWEEP EXPANSION

You speed observation and analysis

trace

This X5 sweep expander, may

sweep time settings and expands the fastest

Voltage measurements of various waveforms quickly made with the 130B, accurate within

A built-in calibrator which

*2%

permits quick verification and standard-

of

the amplifier gain.

or

external sweeps which can

or

externally synchronized and

obtained in either the cabinet

of

to

preamplifiers.

special

a

Miller-integrator sweep circuit which

high

of

tube characteristics than other types

to

10

to

.2

features

order

linearity and stability.

a

two centimeter segment

centimeters

microsecond/cm.

it

can

be

used with

or

its

high sensitivity and

be

to

desired

of

this oscilloscope

are

is

more reliable and

of

for

easy viewing

be

used on

is

accurate with-

be

made accurately

a

wide range of input

without

is

be

rack used

see

ob-

This

tran-

SECTION

GENERAL DESCRIPTION

1-2

a

This instrument should when

refer

graph

1-3

a

The Oscilloscope wired otherwise specified. However, the instrument

may

source power transformer. This conversion in the Maintenance Section (Section

1-4

The three conductor power instrument prong male connector recommended by the National

Electrical

contact two-blade chassis when used with the appropriate receptacle.

of

An adapter should

of

plug adapter short lead from the adapter which should be connected operating personnel.

1-5

The @ 130BR ported in usual manner; mounted in the rack with brackets Figure supported by the dust cover and may

DAMAGE

it

is

to

the “Claim

on

POWER LINE VOLTAGES

for

also

be

if

the proper conversion

POWER CORD

Manufacturers’ Association. The third

is

an offset round pin, added to a standard

ac

to

a

standard two contact output.

is

used, the ground connection becomes

to

a

INSTALLATION

a

1-1.

IN

TRANSIT

be

thoroughly inspected

received. If any damage

for

Damage in Shipment”

the Warranty sheet in this manual.

is

shipped from the factory

115

volts

ac

line operation, unless

operated from a 230 voIts

is

IV).

cable

supplied with the

is

terminated in a polarized three

plug, which grounds the instrument

be

used

to

connect the NEMA

suitable ground

is

designed

19 inch rack by the front panel in the

or,

the dust cover may

In the

OF

latter

for

the protection

RACK MOUNT

so

that

it

case,

the chassis

is

evident,

made

is

described

When the

can

be

as

shown in

be

slipped in

para-

ac

line

to

the

a

of

sup-

rigidly

is

I

Sect. I Page

or

out easily; the screws through the front panel merely holding the chassis in place. mount the

1)

Mount the bracket

2

130BR

using the brackets:

as

shown in Figure

To

1-3

rack

with screws through the outside holes of the brackets. The length of these screws may the front panel from the panel The brackets

at

the

rear

are

installations but can be used required. These

brackets

Hewlett-Packard Company

2)

Remove the dust cover from the

The

cathode

ny date

not Included

You?

glad to process

Whenever

oui

rival,

ray

bbes

prchased

01

sale by

ln

local Hewletl-Packard

a

bbe is

in

full

and

since m eredlt

1)

Carefully wrnp

pddlng material.

2)

Wrap the

3)

Pack

the

4)

Prmund

almllir

tlght ail around

5)

mbes

be

E)

Shipprepaid preferably

We

CATHODf RAY

tube

supplied

from

theHewlett-PackrdCompany.

this

guarantee.

your

warnnty clalm

returned

returned with the tube. Follawshi&lng instructions carefuilyto

can

be

above

In

a

rlgid

tube In each dimension.

the

tube

shockabsorbing

returned

packed

I"

a

do

not

recommend

TUB1

In

your

Hnvlett-Packud

9

are

-ranteed

representative

for

allowed

SHIPPING

the

tube

in

heavy krdt

mntalner

withal leaat four lmhes afpekedexcelslor

the

from

wooden

maintalna

for

you. Please

L

warranty claim the

on

broken

INSTRUCTIONS

In

1/4"

thick

pper

which

Is

material.

bbe.

outside

the

eontlnental

box.

by

AIR

FRElGHTor

parcel

p~st

be

chosen

rails

to

as

desired.

notnecessaryin most

if

added support

are

available from the

as

an accessory item.

130BR

WARRANTY

Oselllodeope

agllmt

electrical

Broken

bbes

a

stock

conwl1

reverse

tubes.

cotton

batting

at

least

4

Be

certain

United

RAILWAY EXPRESS.

or

air

preel post shlpment.

nnd

replacement

failure

for

or

tubes withtmrned phosphor

of

him.

slde

Inches

that

thepcklng

Sate8

one

replacementtubes and

of

this sheet must

or

other

soft

larger

ULVl

or

Is

should

insure

space

and

csWa

year

from

be

de

is

wlll

filled

mount it in the brackets with the

10-32

screws provided.

3)

Slip the

130BR

into the dust cover and fasten in

place with screws through the front panel.

1-6

CATHODE RAY TUBE WARRANTY

The cathode ray tube (crt) supplied with the oscil-

loscope and replacement crt'

Hewlett-Packard company

s

purchased from

are

guaranteed against

electrical failure for one year from the date of sale

by Hewlett-Packard. Cathode Ray Tube Warranty

sheet is illustrated in figure

use

is included in the appendix of this manual.

FROM:

NAME:

COMPANY: ADDRESS:

Perm"

to contact

for

the

are

NAHE:

TITLE:

kt

COMPANY: ADDRESS:

ar-

rn

pceaa

1)

@MsTRuMENT

2)

TUBE TYPE SERIAL

3)

ORIGINAL TUBE REPLACEMENT TUBE

4)

YOUR

5)

DATE PURCHASED

8)

PURCHASED

7) COMPIAINT (Plawe describe mbre

8)

OPERATING CONDITIONS:

further

-

govr

clDlm

quickly please enter the

MODEL

PURCHASE ORDER

FROM

ZIT

Irdormatlon:

NO.

(Please

deacrlbe condltlona prlor

WARRANTY

of

Information

trouble)

1-2.

CLAIM

indicated

SERUL

A

sheet for your

below

to

nnd

at

Model

trusshead

DATE

___

Ume

of faflure

130B

-

HEWLETT-PACKARD

CO.

PAGE

MILL

ROAD,

PAL0

Figure

ALTO, CALIF. U.S.A.

1-2.

Cathode Ray Tube Warranty

i

00013-2

Model

130B

Sect.11 Page

1

\

1

OPERATING INSTRUCTIONS

2-1

Front panel operation controls

ure

enables you to operate

a tailed operating procedures

ating plates.

INTERNAL SWEEP CONTROLS

SWEEP TIME/CM This switch determines the speed at which the Horizontal or Sync INPUT crt beam crosses the screen. HORIZ. SENSlTIVITY tion or internal sweeps are not generated. Associ- sweeping voltages. On ated with the SNEEP TIME/CM switch centric VERNIER which provides continuous ad- rear of justment of sweep speed sweep magnifier operates

CONTROLS AND TERMINALS

2-1.

This description of the operating controls

the

instrument

basic

knowledge of oscilloscope technique.

are

-

switch must be in

an

INT. SWEEP posi- external

between

on

all ranges.

are

shown in Fig-

if

given

in

steps.

you have

De-

the

oper-

is

a con-

A

X5

TRIGGER LEVEL This continuous control selects the level

sync waveform where triggering the TRIGGER LEVEL control trigger circuits

TRIGGER SLOPE This two-position switch, concentric with TRIGGER LEVEL, permits triggering to occur on either positive or negative slope of internal, external or line voltage sync signals.

A

set

of three binding posts used for receiving

sync

a

3-conductor receptacle

the

with the binding posts.

-

are

the most sensitive.

-

voltages and

instrument,

the

SECTION

on

is

to occur. When

is

set

to zero, the

-

external

rack mount model only,

5102,

is

connected

generated

mounted at the

in

parallel

II

the

SYNC This three position switch lets gered triggering can be accomplished from a line quency signal or from an applied signal of sufficient amplitude to produce a one- Horizontal and vertical deflection plates, and a half centimeter deflection. External triggering terminal for crt intensity (Z-axis) modulation. can be produced by signals havingamplitude greater than

SWEEPMODE

As

wise

an

dition through a condition operation

in

counterclockwise position the control switches

into

optimum triggering bias for nearly all waveforms.

-

the

sweep be trig-

either

0.5

internally or externally. Internal

vertical

volt, peak-to-peak.

-

this control

position,

un-synchronized free-running (FREE

which sweeps

a

PRESET position.

is

rotated from the extreme clock-

the

sweep

is

possible (TRIGGERED) to a position

will

generator will pass from

where

not occur.

This

only triggered

At

the

position provides

input

RUN)

extreme

fre-

con-

2-2

The following terminals

the

See

2-3

When

the

at high sensitivities, immediately following turn-on, becoming slower as drift, not be attempted until the instrument warm. For most purposes a will be adequate.

REAR-ACCESS TERMINALS

------DANGER-

rear access plate of

Figures

trace

the

2-8

WARM-UP DRIFT

the

oscilloscope

will

instrument warms up, Because of this

fine

adjustment of amplifier balance should

HIGH

VOLTAGE-----

are

accessible through

the

instrument cabinet:

and

2-10.

is

first

turned

be

quite noticeable, particularly

the

trace drift

5

on,

is

thoroughly

minute warm-up

is

drift

fastest

in

Sect.11 Page

2-4

AC OR DC COUPLING

2

AC coupling permits high gain to be employed without regard for

the

dc level involved.

In

the

AC position the input signal (vertical or horizontal)

is

coupled to

which removes the dc component from

the

amplifier through a capacitor

the

input. This coupling circuit has a low frequency cut-off at

2

cps. To avoid degrading input pulses or square waves below ling. WHEN USING AGE VALUE POSITION

200

cps it

is

advisable to

DC

COUPLING THE AVER-

OF

THE DC DETERMINES THE

OF

THE SWEEP ON THE OSCILLO-

use

dc coup-

SCOPE. IF YOU ARE UNABLE TO FIND THE TRACE WITH THE VERTICAL POSITION CONTROL WHEN USING

DC

COUPLING, TRY AC COUPLING. When AC coupled the maximum dc that may be applied

2-5

BALANCED INPUTS

is

600

volts.

The instrument will accept balanced input signals

on

the

six

most sensitive ranges. This arrange-

ment

is

shown

in

Figure

2-7.

Driving the instrument from a balanced source can be stray pickup that would otherwise obscure desired information. To take advantage of noise reduction that input, you must be the source conductor shielded cable oscilloscope. The input cable shield must connected to a suitable ground, loscope or some other cautions

very

effective in removing

is

possible

sure

that neither terminal of

is

connected to ground, and

between

point.

in

the external input circuit, any stray

the

with

a balanced

use

the source and

either

at the oscfl-

With these pre-

unwanted

the

double

be

signals (noise, hum, etc.) will be coupled equally to

the

two input terminals, and be cancelled by

the

differential amplifiers. Since

formation

is

applied between nals, it will be amplified and displayed normal manner. Since

the

noise

the

two

is

desired

input

termi-

in

a problem

in-

the

Model

at

mainly

is

available only on the most sensitive ranges

low level, the fact that balanced input generally not a serious limitation. The common-mode signal rejection will be at

least

40

db

(1/100

of

the

input signal). using a balanced input certain limitations must be considered. The proper operating levels must be maintained

on

the

input

amplifier: The COMMON-MODE SIGNAL VOLTAGE MUST NOT EXCEED

TIVE,

this

1.5

VOLTS EITHER POSITIVE ORNEGA-

ON

EITHER INPUT TERMINAL. Note that

is the sum of all voltages (dc plus peak ac).

NOTE

If

balanced ac coupling

to connect a capacitor

is

desired, it is necessary

in

the external signal path to the middle terminal, since a dc voltage on this terminal only unbalances arrangement

is

shown

in

Figure

the

amplifier. This

2-7.

-----------

2-6

Basic operating procedures are described following illustrations. Positions of controls are different on are identical to those of the rack model.

Figure DescriDtion

2-2 2-3 2-4

2-5 2-6

2-7 2-8

.

2-9 2-10

OPERATING PROCEDURES

the

cabinet model but their functions

VERTICAL BALANCE ADJUSTMENT HORIZONTAL BALANCE ADJUSTMENT INTERNAL SWEEP-INTERNAL SYNCHRONIZATION INTERNAL SWEEP-EXTERNAL SYNCHRONIZATION EXTERNAL HORIZONTAL INPUT AC COUPLING BALANCED INPUT

CONNECTION TO CRT DEFLECTION

PLATES EXTERNAL INTENSITY MODULATION ALIGNING SCOPE TRACE

WITH

GRATICULE

130B

When

in

the

is

Model 130B Sect.

VERTICAL BALANCE ADJUSTMENT

I1

Page

3

After

Warm-up:

Turn

1.

2.

3.

4.

5.

6.

SWEEP MODE control to FREE

Set HORIZ. SENSITIVITY switch to

SNEEP X1. Set SWEEP TIME/CM switch

venient

faster than

factory.)

Short vertical input terminals together. Set AC-DC switch to

Set VERT. SENSITIVITY to CAL. VERNIER to CAL.

base

line

is

formed.

50

MILLISECONDS/CM

DC.

so

(Any

RUN.

INT.

that a consweep

time

is

satis-

Turn

RO

b

7.

Center bottom portion of calibration signal trace using VERT. POS. control.

8.

Set VERT. SENSITIVITY to 1 MILLIVOLTS/ CM.

9.

Center trace with coarse (screwdriver)

VERT.

control if unbalance

10.Repeat steps

NOTE: etched board) VERNIER.

DC

BAL, control or with

is

slight.

6,

7,8

and

A

separate adjustment (Bal. Adj. on

is

provided to balance

9

if

fine

necessary.

/

(knob)

the

Figure

2-2

Sect.

I1

Page

4

HORIZONTAL BALANCE ADJUSTMENT

Model

130B

After warm-up:

1.

Short together the horizontal INPUT terminals.

2.

Set AC-DC switch

3.

Set HORIZ. SENSITIVITY to CAL. Turn VERNIER

4.

Adjust the HORIZ. POS. control

to

left edge of the calibrating signal

CAL.

to

DC.

to

place the

trace

the major vertical axis.

JUMPER

5.

6.

7.

NOTE: A separate adjustment (Bal. Adj. on the etched

on

VERNIER.

Set HORIZ. SENSITIVITY VOLT/CM.

Return the spot with the

coarse

BAL. control if the unbalance

Repeat steps

board)

to

the major vertical axis

(screwdriver) HORIZ.

or

with the fine (knob) control

is

slight.

2,

3

4,

and 5 if necessary.

is

provided

RO

1

to

balance the

MILLI-

DC

Figure

2-3

Model 130B

@-

0-

Sect.11 Page 5

INTERNAL SWEEP - INTERNAL SYNCHRONIZATION

1.

Set HORIZ. SENSITIVITY switch SWEEP

2.

Set SYNC switch to INT.

3.

Set SWEEP MODE to PRESET.

4.

Connect vertical input signal into vertical input terminals.

5.

Set AC-DC switch for

6.

Adjust VERT. SENSITIVITY sensitivity.

X1

(or

to

X5

for

magnified sweeps)

type

coupling desired.

to

for

INT.

desired

Figure

7.

Set TRIGGER SLOPE switch for triggering

on

positive

as desired.

8.

Set TRIGGER LEVEL control

9.

Select desired sweep speed with SWEEP TIME/CM switch.

10.Adjust TRIGGER LEVEL desired level. In some cases, it may necessary to switch SWEEP MODE from PRESET particular trace being viewed.

2-4

or

negative

to

an individual adjustment

slope

of

to

input signal,

to

start trace at

0.

for

be

the

Sect.11 Page

6

Model 130B

INTERNAL SWEEP - EXTERNAL SYNCHRONIZATION

1.

Set HORIZ. SENSITIVITY switch SWEEP

2.

Set SYNC switch to EXT.

3.

Set SWEEP MODE

4.

Feed synchronizing signal more) to the horizontal input terminals.

5.

Set AC-DC switch

6.

Set TRIGGER LEVEL to

7.

Feed vertical input signal into vertical input terminals.

X1

(or

to

X5

for magnified sweeps).

.

to

PRESET.

(0.5

for

type coupling desired.

0.

volts p-p or

to

IfiT.

Figure

8.

Adjust VERT. SENSITIVITY for desired sensitivity.

9.

Select desired sweep speed with SWEEP TIME/CM switch.

10. Set TRIGGER SLOPE for triggering on posi-

or

tive

11.Adiust TRIGGER LEVEL desired level. In some cases, it may

found necessary to switch SWEEP MODE

from PRESET to an individual adjustment for

the particular trace being viewed.

negative slope, as desired.

to

start trace at

2-5

be

Model

130B

EXTERNAL HORIZONTAL INPUT

Sect.

I1

Page

7

?

1.

Feed horizontal signal to horizontal input terminals.

2.

Set AC-DC switch des ired.

3.

Set

HORIZ.

sensitivity. ing Lissajous patterns,

SENSITIVITY switch

for

type of input coupling

for

desired

Figure

4.

Adjust horizontal position

HORIZ.

This type

POS. control.

of

input

2-6

will

be

etc.

found

of

pattern with

useful

for

view-

Sect.11 Page

8

Model

130B

AC COUPLING BALANCED INPUT

VERT

POS

The following procedure input, but

1.

Set VERT. SENSITIVITY to

is

the same for the horizontal input.

is

for the vertical

50

MILLIVOLTS/

CM, input not balanced on higher ranges.

2.

Set AC-DC switch to AC.

3.

Disconnect shorting strap.

4.

Connect

0.1

microfarad capacitor to mid-

terminal.

5.

Connect input signal

6.

Ground input at the black terminal.

The capacitor must

to

A

and

be

used to block any dc.

RO

B.

Figure

2-7

Model

130B

CONNECTION TO CRT DEFLECTION PLATES

Sect.

I1

Page 9

The following procedure ternal signals to

but

is

the

1.

Remove rear access plate fastened by four

the

same for the horizontal plates.

is

for connecting ex-

vertical deflection plates,

screws.

2.

Remove

cal

replace them with

the

shorting bars between

Amplifier and terminals

1

megohm,

D3

the

and

1/2

resistor.

Verti-

D4

and

watt

Figure

For balanced AC coudinp:

3.

Connect balanced signal through appropriate capacitor to

D3

and

D4.

For single-ended AC coupling:

4.

Bypass

D4

to chassis

with

capacity.

5.

Connect

the

signal to

D3

through an appro-

priate capacitor.

NOTE:

deflect and connect

If

the

it

is

desired to have positive voltage

beam

downward, bypass

the

signal to

D4.

2-8

an

adequate

D3

tochassis

Sect.11

Page

10

EXTERNAL INTENSITY MODULATION

Z

AXIS

02

POSlTNE

DEFLECTS

RT

d

D3

POSITIVE DEFLECTS UP

VERT

I

RO

CA

Model

L

130B

d

CAUTION: Dangerous Voltages this terminal board. Be sure the instrumekt turned

To

signals:

1.

off

when making this connection.

intensity modulate the CRT with external

Remove small screws

rear

access

at

rear

plate fastened

of

are

present-on

dust cover.

by

four

is

2.

Remove shorting

3.

Connect modulating signal

A

positive voltage

the CRT trace from normal intensity.

bar.

of

to

20

volts peak will blank

these terminals

Figure

2-

9

Model

130B

Sect.11 Page

11

ALIGNING SCOPE TRACE

WITH

GRATICULE

RO

CAUTION: DANGEROUS VOLTAGES ARE

PRESENT INSIDE THE INSTRUMENT

Remove two screws at rear of dust cover and slide cover off to rear. Fiber lever

both

radial and longitudinal positioning of CRT

and

is

locked by clamp

(1).

(2)

controls

Figure

To align sweep trace with graticule loosen clamF

(1)

with a screwdriver. Rotate fiber arm

until

the

trace

is

parallel to horizontal lines

graticule. Tighten clamp

(1)

after adjustment

has been made.

2-10

(2)

on

Sect.

111

Page

0

Model

130B

r--

I

J

I

c

0

L

a

FW

3-

a5

+-I

3n

or

a

E

(d

k

bn

(d

8

c

0.

-I

a

4

al

k

3 bn

iz

OU

I

Model 130B

J

Sect.111 Page

1

3-1

GENERAL CONTENT

This section contains a brief description of the over-all operation of the Model 130B Oscilloscope, description of each major section and detailed description

3-2

The block diagram in Figure circuits of the Model 130B Oscilloscope.

A.

VERTICAL AMPLIFIER

The Vertical Amplifier receives the input signal, amplifies it, and drives the vertical deflection plates of the cathode ray tube. In addition,

this

amplifier determines the vertical position of

the spot on

chronizing

B. HORIZONTAL AMPLIFIER

The Horizontal Amplifier receives either from Sweep Generator, amplifies zontal deflection plates of Except for

fier

for amplifying the internally- generated sawtooth voltage, Vertical Amplifier.

SflEEPGENERATOR The Sweep Generator forms a sawtooth volt-

to control across Generator generator,

the

sawtooth. The trigger generator controls allow sawtooth sweep begins.

of

a Schmitt trigger.

OVER-ALL OPERATION

3-1

the

screen

the

sweep

the

provisions in

the

face of

is

divided into two parts:

2)

the

operator to choose

and supplies a signal for syn-

with

the vertical input signal.

horizontal INPUT jack or from the

it

and drives

the

cathode ray

the

Horizontal Ampli-

it

is

essentially

horizontal movement of the spot

the

cathode ray tube. The Sweep

a

trigger generator, which starts

the

point at which the

shows the basic

its

signal

the

hori-

tube.

the

same as

1)

a

sawtooth

the

SECTION

THEORY

In addition to forming the 'internal sweep of the oscilloscope, the required unblanking pulse trace during

D.

CALIBRATOR

An nominal frequency of 300 cps, ting

the

either

to CAL., turns

and connects

E. CATHODE

accelerator type. It

P1 phosphor screen but P11 phosphors also and P2 upon special order.

All are electrically interchangeable and the tube

easily changed. makes possible

which requires no resetting when adjusting the

FOCUS or INTENSITY controls. plate terminals are connected through removable jumpers at rect connections to the plates

3-3

The vertical amplification channel consists of three parts:

ator,and the amplifier section proper.

A.

is

capacitor

DC

attenuator.

the VERT. or HORIZ. SENSITIVITY switches

The cathode ray tube

VERTICAL AMPLIFICATION CHANNEL

AC - DC The signal comes into the input terminals and

fed to

position, the signal goes directly to

the

each

sweep.

internal square-wave calibrator, with

basic gain of the amplifiers. Turning

on

its

output to the appropriate amplifier.

RAY

a

the

rear of the instrument

the

SWITCH

the

AC-DC switch. For ac coupling,

is

switched into

OF

Sweep Generator also supplies

the

calibrator supply voltage

TUBE

is

normally supplied

is

The

simple astigmatism adjustment

OPERATION

which

brightens

is

provided for

is

a SAQP - mono-

available

mono-accelerator anode

in

The

the

deflection

so

can

be made easily.

AC-DC

switch,

the

signal path.

the

input attenu-

set-

with

P7 and

that di-

In

the

input

111

the

a

is

a

the