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INSTRUCTION

MANUAL

Serial

Number

_____________

TYPE

3B5

AUTOMATIC/

PROGRAMMABLE

TIME

BASE

Tektronix,

Inc.

S.W.

Millikan

Way

•

P.

O.

Box

500

•

Beaverton,

Oregon

97005

•

P one

644-0161

•

Cables:

Tektronix

070-0538-00

666

WARRANTY

All

Tektronix

inst-uments

are

warranted

against

defective

materials

and

workman



s ip

for

one

year.

Tektronix

transformers,

manufactured

in

our

own

plant,

are

war



ranted

for

t e

life

of

t e

instrument.

Any

questions

wit

respect

to

t e

war



ranty

mentioned

above

s ould

be

taken

up

wit

your

Tektronix

Field

Engineer.

Tektronix

repair

and

replacement-part

service

is

geared

directly

to

t e

field,

t erefore

all

requests

for

repairs

and

re



placement

parts

s ould

be

directed

to

t e

Tektronix

Field

Office

or

representative

in

your

area.

T is

procedure

will

assure

you

t e

fastest

possible

service.

Please

include

t e

instrument

Type

and

Serial

or

Model

Number

wit

all

requests

for

parts

or

service.

Specifications

and

price

c ange

privi



leges

reserved.

Copyrig t

c

1966

by

Tektronix,

Inc.,

Beaverton,

Oregon.

Printed

in

t e

United

States

of

America.

All

rig ts

reserved.

Contents

of

t is

publication

may

not

be

reproduced

in

any

form

wit out

permission

of

t e

copyrig t

owner.

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

Type

3B5

CONTENTS

Section

Section

Section

Section

Section

Section

1

2

3

4

5

6

C aracteristics

Operating

Instructions

Circuit

Description

Maintenance

Performance

C eck

Calibration

Abbreviations

and

Symbols

Parts

Ordering

Information

Section

7

Electrical

Parts

List

Mec anical

Parts

List

Information

Section

8

Mec anical

Parts

List

I

j

Section

9

Diagrams

Mec anical

Parts

List

Illustrations

Accessories

t is

manual

Abbreviations

and

symbols

used

in

are

based

on,

or

taken

directly

from,

IEEE

Standard

260

“

Standard

Symbols

for

Units

”

MIL-STD-12B

and

ot er

standards

of

t e

elec



tronics

industry.

C ange

information,

if

any,

is

located

at

t e

rear

of

t is

manual.

■®1

Type

3B5

Fig.

1-1.

Type

3B5

Auto atic/Progra able

Ti e

Base

unit.

Type

3B5

SECTION

1

CHARACTERISTICS

T e

Tektronix

Type

3B5

Automatic/Programmable

Time

Base

unit

provides

automatic

and

programmable

time-base

features,

in

addition

to

conventional

time-base

features,

for

Tektronix

oscilloscopes

w ic

accept

3-series

time-base

units

1

.

T e

Type

3B5

provides

automatic

sweep

rate

and

trigger

seeking

on

Seek

command

eit er

from

t e

front-panel

SEEK

button,

from

a

remote-seeking

probe

(t roug

an

associated

automatic/programmable

amplifier

unit)

or

from

an

external

source

(t roug

eit er

t e

front-panel

PROGRAM

connector

or

t e

program

connector

of

t e

associated

automatic/pro



grammable

amplifier

unit).

All

front-panel

control

functions

(except

variable

sweep

rate)

can

be

externally

programmed

t roug

t e

front-panel

PROGRAM

connector.

T e

MANUAL

TIME/DIV

switc

provides

selection

of

sweep

rates

from

5

seconds/division

to

10

nanoseconds/division

wit

delayed

1

Except

the

Type

561

(SN

5000

and

below).

When

used

in

a

Type

565,

a

vertical

sweep

is

provided.

sweep

magnification

of

10

and

100

times

(up

to

a

maximum

magnified

sweep

rate

of

0.1

microseconds/division).

A

front-panel

illuminated

readout

panel

indicates

sweep

rate,

magnified

sweep

(wit

correct

indication

of

magnified

sweep

rate),

non-triggered

sweep

and

uncalibrated

sweep.

T e

readout

panel

functions

in

all

modes

of

operation.

T e

c aracteristics

w ic

follow

are

divided

into

two

cate



gories.

C aracteristics

listed

in

t e

Performance

Requirement

column

are

c ecked

in

t e

Performance

C eck

and

Calibra



tion

sections

of

t is

manual.

Items

listed

in

t e

Supplemental

Information

column

are

provided

for

reference

use

and

do

not

directly

reflect

t e

measurement

capabilities

of

t is

instrument.

T e

Performance

C eck

procedure

given

in

Section

5

of

t is

manual

provides

a

convenient

met od

of

c ecking

t e

Performance

Requirements

listed

in

t is

section.

T e

following

c aracteristics

apply

over

an

ambient

tempera



ture

range

of

0°

C

to

+50°

C,

except

as

ot erwise

indicated.

Warm-up

time

for

given

accuracy

is

five

minutes.

ELECTRICAL

CHARACTERISTICS

TRIGGERING

C aracteristic

Performance

Requirement

Supplemental

Information

Source

Internal

or

external

Coupling

AC

internal

AC

or

DC

external

Polarity

Sweep

can

be

triggered

from

positive-going

or

negative-going

portion

of

trigger

signal.

Slope

c anged

automatically

eac

time

CHANGE

SLOPE

button

is

pressed.

Mode

Auto

triggering

Normal

triggering

adjustable

for

desired

level

Internal

Trigger

Sensitivity

AUTO

and

AC

0.5

division

of

deflection,

minimum,

50

Hz

to

20

MHz

C ecked

wit

Type

3A5

signal

dis



played,

10

millivolts/division

or

greater

sine

wave.

Typically

—

3

dB

down

at

10Hz

External

Trigger

Sensitivity

AC

1.0

volt,

peak

to

peak,

50

Hz

to

20

MHz

Typically

—

3

dB

down

at

10

Hz

DC

1.0

volt,

peak

to

peak,

10

Hz

to

20

MHz

2.5

volts,

peak

to

peak,

DC

to

10

Hz

Trigger

LEVEL

Control

Range

INT-AC

At

least

+

and

—

10

volts

EXT-AC

At

least

+

and

—

20

volts

EXT-DC

At

least

+

and

—

10

volts

AUTO

Approximately

10%

and

90%

of

trigger

signal

transition

wit

a

minimum

of

0.5

division,

(10

millivolts/division

or

greater)

1

kHz

sine

wave

displayed

wit

Type

3A5

External

Program

Trigger

Level

Range

Same

as

front-panel

range

wit

current

c ange

between

about

0

and

400

micro



amps

External

Trigger

Input

RC

C aracteristics

Approximately

150

kilo ms

paralleled

by

about

22

pF

Maximum

Input

Voltage

at

EXT

TRIG

INPUT

connector

100

volts,

DC

+

peak

AC

1-1

Characteristics

—

Type

3B5

HORIZONTAL

DEFLECTION

SYSTEM

C aracteristic

Performance

Requirement

Supplemental

Information

Sweep

Rates

Manual

Mode

5

seconds/division

to

10

nanoseconds/division

in

27

calibrated

steps.

Sweep

rate

indicated

on

readout

panel

Selected

by

front-panel

MANUAL

TIME/

DIV

switc .

Steps

in

1-2-5

sequence

Seek

Mode

5

seconds/division

to

3.1

microseconds/divi-

sion

in

24

calibrated

sleps.

Sweep

rate

indi



cated

on

readout

panel

Automatically

selected

w en

seek

com



mand

is

received.

Steps

in

1-2-5

sequence

External

Mode

5

seconds/division

to

10

nanoseconds/division

in

27

calibrated

steps.

Sweep

rate

indicated

on

readout

panel

Selected

by

external

program

connected

to

PROGRAM

connector.

Steps

in

1-2-5

sequence

Sweep

Accuracy

(at

25°

C,

±5°)

1

s

to

10

ns

Wit in

±3%

of

indicated

sweep

rate

VARIABLE

control

fully

clockwise

(UN



CAL

readout

off)

and

DLY'D

SWP

MAG

switc

set

to

OFF

(MAG'D

SWP

readout

off).

10,

20

and

50

ns

accuracy

must

be

c ecked

in

accordance

wit

Performance

C eck

5

s

and

2

s

Wit in

±5%

of

indicated

sweep

rate

Variable

Sweep

Rate

Uncalibrated

sweep

rate

to

2.5

times,

or

greater,

t e

indicated

sweep

rate.

s/DIV

read



out

turns

off

and

UNCAL

readout

turns

on

w en

VARIABLE

control

is

not

set

to

CAL

posi



tion

Slowest

sweep

rate

12.5

seconds/divi



sion,

or

greater,

in

5

s

position

Sweep

Lengt

DLY

’

D

SWP

MAG

at

OFF

10.3

to

11.3

divisions

Measured

at

1

ms/DIV

sweep

rate

DLY'D

SWP

MAG

on

12

to

15

divisions

Delayed

Sweep

Magnification

Basic

sweep

rates

between

5

s

and

1

μ

s

can

be

magnified

wit

t e

Del

a

yed

Sweep

Magnifier.

Calibrated

DELAY

control

selects

portion

to

be

magnified.

Basic

sweep

rates

between

5

s

and

10

μ

s

can

be

magnified

100

times;

basic

sweep

rates

between

5

s

and

1

μ

s

can

be

magnified

10

times

Readout

panel

indicates

correct

magni



fied

sweep

rate

Magnified

Sweep

Accuracy

(at

25°

C,

±5°)

1

S

to

1

JUS

Wit in

±

3%

of

sweep

rate

indicated

on

read



out

panel

VARIABLE

control

fully

clockwise

(UN-

CAL

readout

off)

5

s

and

2

s

Wit in

±5%

of

sweep

rate

indicated

on

read



out

panel

Calibrated

Delay

Range

Continuous

from

0

to

10

divisions

from

t e

start

of

t e

trace

Delay

Accuracy

Wit in

±1.5%

of

fu

l

l

scale

at

1

ms/DIV.

Wit in

±3%

of

full

scale

at

all

ot er

sweep

rates

Calibrated

at

1

ms/DIV.

Exclude

first

0.2

division

of

display.

Includes

incre



mental

DELAY

dial

linearity

Incremental

DELAY

Dial

Linearity

Wit in

±0.4%

of

full

scale

Exclude

first

0.2

division

of

display

Delayed

Sweep

Magnifier

Jitter

3

parts

or

less

per

10,000

Equal

to

0.3

division

or

less

w en

meas



ured

wit

x1

00

magnification

at

1

ms/

DIV

basic

sweep

rate

Output

DC

Level

4-180

volts,

±10

volts

Beam

positioned

to

CRT

electrical

center

SEEK MODE

Cycles

Per

Sweep

Between

two

and

six

cycles

wit

nominal

CYCLES/SWEEP

setting

obtained

in

Calibra



tion

procedure

Automatically

selected

w en

seek

com



mand

is

received.

Front-panel

CYCLES/

SWEEP

adjustment

provides

range

of

about

0.5

to

3

times

t is

nominal

setting

Automatic

Seek

Cycling

Time

One

to

two

seconds

W en

seek

command

is

continuous

Automatic

Seeking

Time

500

milliseconds

or

less

wit

10

MHz

sine

wave

input

and

Trigger

Function

switc

set

to

INT-AUTO

Frequency

Range

for

Seek

Mode

Operation

30

Hz

to

20

MHz

Seek

Mono

Pulse

Widt

1.0

to

1.8

seconds

1-2

Characteristics

—

Type

3B5

PROGRAMMABLE

FUNCTIONS

C aracteristic

Performance

Requirement

Supplemental

Information

Trigger

Function

Int

Auto

—

If

not

programmed

Int

AC

—

Terminal

31

Ext

AC

—

Terminal

30

Ext

DC

—

Terminal

28

Grounding

(zero

volt)

digital

logic

to

given

terminal

of

PROGRAM

connector

activates

function

Trigger

Slope

+

Slope

—

If

not

programmed

—

Slope

—

Terminal

27

Trigger

Level

Analog

current

c ange

between

about

0

and

400

microamps

at

terminal

15

of

PROGRAM

connector

provides

same

trig



ger

level

range

as

front-panel

LEVEL

control

Sweep

Rate

Multiplier

X

1

—

Terminal

2

X2

—

Terminal

3

X5

—

Terminal

5

Sweep

multiplier,

sweep

decade

and

decade

enable

must

be

programmed

for

eac

sweep

rate.

Grounding

(zero

volt)

digital

logic

to

given

terminals

of

PRO



GRAM

connector

activates

function

Enable

A

—

Terminal

23

B

—

Terminal

24

Decade

Enable

Logic

Terminal

A

B

1

s

0.1

s

6

10

ms

1

ms

8

0.1

ms

10

μ

s

9

1

μ

s

0.1

μ

s

11

10

ns

26

Horizontal

Position

Analog

current

c ange

between

about

0

and

500

microamps

at

terminal

14

of

PROGRAM

connector

provides

±3

divi



sion

external

orizontal

position

range

Delayed

Sweep

Magnifier

OFF

—

Terminal

33

X10

—

Terminal

34

X

1

00

—

Terminal

36

Grounding

(zero

volt)

digital

logic

to

given

terminal

of

PROGRAM

connector

activates

function

Magnifier

Delay

Analog

current

c ange

between

about

350

and

200

microamps

at

terminal

17

of

PROGRAM

connector

provides

0

to

10

division

external

delay

range

External

Mode

Command

Type

3B5

switc es

to

External

Mode

w en

terminal

21

of

PROGRAM

connector

is

grounded

Remote

Seek

Type

3B5

switc es

to

Seek

Mode

(except

w en

External

Mode

Command

is

present)

w en

terminal

12

of

PROGRAM

connector

is

grounded

Momentary

ground

produces

two

to

six

cycles

(nominal

adjustment)

display;

con



tinuous

ground

recycles

unit

every

one

to

two

seconds

Single

Sweep

+

125-volt

external

oldoff

lockout

ap



plied

to

terminal

7

and

—

12-volts

reset

momentarily

applied

to

terminal

25

of

PROGRAM

connector

provides

single



sweep

operation

ADDITIONAL

FUNCTIONS

AVAILABLE

AT

PROGRAM

CONNECTOR

External

Horizontal

Input

Deflection

factor

Applied

to

terminal

4

of

PROGRAM

connector.

Sweep

lockout

at

terminal

7,

external

unblanking

at

terminal

13

and

orizontal

position

centering

at

terminal

14

also

necessary.

5

volts/division

±5%

Bandwidt

DC

to

750

kHz,

or

greater

Maximum

input

voltage

75

volts,

DC

+

peak

AC

Input

resistance

Approximately

100

kilo ms

1-3

Characteristics

—

Type

3B5

Additional

Functions

(cont)

C aracteristic

Performance

Requirement

Supplemental

Information

Sweep

Out

0.05

milliamp/division,

±10%,

at

termi



nal

16

of

program

connector

2

External

Unblanking

—

12

volts

DC

unblanks

CRT

Apply

to

terminal

13

of

PROGRAM

con



nector

Current

Available

from

PROGRAM

Connector

(maximum)

Supply

Terminal

Current

+

125

V

18

30

mA

-12.2

V

1

75

mA

-100

V

19

1

mA

ENVIRONMENTAL

CHARACTERISTICS

T e

following

environmental

test

limits

apply

w en

tested

in

accordance

wit

t e

recommended

test

procedure.

T is

instrument

will

meet

t e

electrical

performance

requirements

given

in

t is

section

following

environmental

test.

Complete

details

on

environmental

test

procedures,

including

failure

criteria,

etc.,

may

be

obtained

from

Tektronix,

Inc.

Contact

your

local

Tektronix

Field

Office

or

representative.

C aracteristic

Performance

Requirement

Supplemental

Information

Temperature

Operating

0°

C

to

+50°

C

Non-operating

-40°

C

to

+65°

C

Altitude

Operating

15,000

feet

maximum

Non-operating

50,000

feet

maximum

May

be

tested

during

non-operating

temperature

tests

Vibration

Operating

Vibrate

for

15

minutes

along

eac

axis

at

a

total

displacement

of

0.015

inc

(1.9

g

at

50

c/s)

wit

t e

frequency

varied

from

10-50-10

c/s

in

one-minute

cycles.

Hold

at

any

resonant

point

for

t ree

minutes.

If

no

resonant

points

are

found,

vibrate

at

51)

c/s

for

t ree

minutes

on

eac

axis.

Instrument

secured

to

vibration

platform

during

test.

Total

vibration

time

about

55

minutes.

S ock

Non-operating

One

s ock

of

30

g,

one- alf

sine,

11

milli



second

duration

along

eac

major

axis.

Guillotine

type

s ock

Transportation

Package

vibration

Meets

National

Safe

Transit

type

of

test

w en

correctly

packaged

Vibrate

for

one

our

slig tly

in

excess

of

1

g

Package

s ould

just

leave

vibration

sur



face

Package

drop

Drop

from

a

eig t

of

30

inc es

on

one

corner,

all

edges

radiating

from

t at

corner

and

all

flat

surfaces

Total

of

10

drops

MECHANICAL

CHARACTERISTICS

Si ilar

output

available

at

ter inal

18

of

the

interconnecting

plug.

C aracteristic

Information

Construction

C assis

Aluminum

alloy

Panel

Aluminum

alloy

wit

anodized

finis

Circuit

boards

Glass-expoxy

laminate

Dimensions

Fits

3-series

compartments

of

560-

series

Oscilloscopes

Connectors

EXT

TRIG

INPUT

BNC

PROGRAM

37-terminal

connector.

Mates

wit

Cinc

No.

DC-37P-C33

(Tektronix

Part

No.

131-0422-00)

STANDARD

ACCESSORIES

Standard

accessories

supplied

wit

t e

Type

3B5

are

listed

on

t e

last

pullout

page

at

t e

rear

of

t is

manual.

For

optional

accessories

available

for

use

wit

t is

instrument,

see

t e

current

Tektronix,

Inc.

catalog.

1-4

SECTION

2

OPERATING

INSTRUCTIONS

General

Infor ation

To

effectively

use

t e

Type

3B5,

t e

operation

and

capa



bilities

of

t e

instrument

must

be

known.

T is

section

describes

t e

operation

of

t e

front-panel

controls

and

con



nectors,

gives

first

time

and

general

operating

information,

External

Mode

programming

information

and

lists

some

basic

applications

for

t is

instrument.

T e

Type

3B5

operates

wit

t e

indicator

oscilloscope

and

an

amplifier

unit

to

form

a

complete

oscilloscope

system.

W en

used

wit

an

automatic

programmable

amplifier

unit,

a

remote-seeking

probe

and

an

external

programmer,

a

com



plete

system

is

formed

w ic

as

manual,

automatic

seeking,

remote

seeking

and

external

programming

measurement

capabilities.

Installation

CAUTION

Turn

off

t e

oscilloscope

power

before

inserting

or

removing

t e

plug-in

unit.

T e

Type

3B5

is

designed

for

use

in

t e

Horizontal

plug

in

compartment

of

a

560-series

indicator

oscilloscope.

How



ever,

t e

Type

3B5

can

be

inserted

into

t e

Vertical

plug-in

compartment

of

t e

indicator

oscilloscope

to

provide

a

sweep

t at

runs

vertically

on

t e

CRT

screen

(no

blanking

provided

and

instrument

may

not

meet

performance

requirements

given

in

Section

1

if

used

in

t is

manner).

Since

t e

orizontal

and

vertical

deflection

plate

sensitivities

of

t e

oscilloscope

are

different,

t e

Type

3B5

must

be

recalibrated

to

provide

an

accurate

display

for

vertical

deflection

use.

T roug out

t is

manual,

it

is

assumed

t at

t e

Type

3B5

is

used

to

provide

orizontal

deflection

in

t e

conventional

manner.

To

install

t e

Type

3B5

in

t e

oscilloscope,

insert

it

into

t e

plug-in

compartment

and

pus

it

in

as

far

as

possible.

Be

sure

t e

securing

latc

at

t e

bottom

of

t e

panel

is

out

of

t e

way

(turn

knob

counterclockwise)

to

prevent

damage

to

t e

oscilloscope

front

panel.

Secure

t e

plug-in

into

t e

compartment

by

turning

t e

securing-latc

knob

clockwise

until

it

is

tig t.

To

remove

t e

plug-in

from

t e

compartment,

turn

t e

securing-latc

knob

several

turns

counterclockwise.

T en,

pull

t e

plug-in

partially

out

of

t e

compartment

wit

t e

knob

and

take

old

of

t e

plug-in

by

t e

support

rods

to

remove

it

from

t e

oscilloscope.

W enever

t e

Type

3B5

is

transferred

from

one

oscillo



scope

to

anot er,

t e

sweep

calibration

s ould

be

c ecked

and

adjusted

if

necessary

to

provide

accurate

measurements

wit

t e

complete

system.

See

Horizontal

Gain

Adjustment

in

t is

section

for

adjustment

procedure.

Cooling

T e

Type

3B5

does

not

require

special

cooling

ot er

t an

t at

provided

by

t e

indicator

oscilloscope.

W en

operated

wit in

t e

ambient

temperature

range

given

in

Section

1,

t e

Type

3B5

provides

accurate

measurements

(note

excep



tion

for

sweep

accuracy).

FRONT-PANEL

CONTROLS

AND

CONNECTORS

Introduction

All

controls

and

connectors

required

for

t e

operation

of

t e

Type

3B5

are

located

on

t e

front

panel

of

t e

unit

(see

Fig.

2-1).

To

make

full

use

of

t e

capabilities

of

t is

instru



ment,

t e

operator

s ould

be

familiar

wit

t e

function

and

use

of

eac

of

t ese

controls

and

connectors.

A

brief

descrip



tion

of

t e

function

or

operation

of

t e

front-panel

controls

and

connectors

follows.

More

detailed

information

on

con



trol

operation

and

use

is

given

under

General

Operating

Information.

Trigger

Controls

EXT

TRIG

Input

connector

for

external

trigger

signal.

INPUT

Trigger

Function

(not

labeled)

SLOPE

Lever

switc

w ic

selects

t e

trigger

source,

coupling

and

mode.

INT-AUTO

—

Permits

normal

triggering

on

repetitive

waveforms

wit

repetition

rates

ig er

t an

50

Hz.

For

lower

repe



tition

rates

or

w en

t ere

is

no

trigger

signal,

t e

sweep

generator

free

runs

at

t e

sweep

rate

to

w ic

it

is

set

to

pro



vide

a

reference

trace.

Auto

Trigger

lig t

indicates

w en

unit

is

in

t e

auto

trigger

mode.

INT-AC

—

Sweep

triggered

by

internal

sig



nal

from

amplifier

unit.

Trigger

circuit

rejects

DC

and

attenuates

AC

signals

below

about

50

Hz.

EXT-AC

—

Sweep

triggered

by

external

sig



nal

applied

to

t e

EXT

TRIG

INPUT

con



nector.

Trigger

circuit

rejects

DC

and

attenuates

AC

signals

below

about

50

Hz.

EXT-DC

—

Sweep

triggered

by

external

sig



nal

applied

to

t e

EXT

TRIG

INPUT

con



nector.

Trigger

circuit

accepts

AC

and

DC

signals.

(+)

and

(

—

)

lig ts

indicate

w ic

slope

of

t e

trigger

signal

starts

t e

sweep.

W en

t e

(

—

)

lig t

is

on,

t e

sweep

can

be

trig



gered

on

t e

negative-going

slope

of

t e

trigger

signal;

t e

(+)

lig t

indicates

t at

t e

sweep

can

be

triggered

on

t e

positive



going

slope

of

t e

trigger

signal.

Trigger

slope

is

c anged

by

pressing

t e

CHANGE

SLOPE

button

in

t e

center

of

t e

LEVEL

control.

2-1

Operating

Instructions

—

Type

3B5

Fig,

2-1.

Front-panel

controls

and

connectors

of

the

Type

3B5.

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

2-2