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INSTRUCTION

MANUAL

Serial

Number

_____________

114

PULSE

GENERATOR

Tektronix,

Inc.

S.W.

,

Millikan

Way

•

P.

O.

Box

500

•

Beaverton,

Oregon

97005

•

Phone

644-0161

•

ables:

Tektronix

070-465

265

WARRANTY

All

Tektronix

instruments

are

warranted

against

defective

materials

and

workman



ship

for

one

yeor.

Tektronix

transformers,

manufactured

in

our

own

plant,

are

war



ranted

for

the

life

of

the

instrument.

Any

questions

with

respect

to

the

war



ranty

mentioned

above

should

be

taken

up

with

your

Tektronix

Field

Engineer.

Tektronix

repair

and

replacement-part

service

is

geared

directly

to

the

field,

there



fore

all

requests

for

repairs

and

replace



ment

parts

should

be

directed

to

the

Tek



tronix

Field

Office

or

Representative

in

your

area.

This

procedure

will

assure

you

the

fastest

possible

service.

Please

include

the

instrument

Type

and

Serial

number

with

all

requests

for

parts

or

service.

Specifications

and

price

change

priv



ileges

reserved.

opyright

,c

1965

by

Tektronix,

Inc.,

Beaverton,

Oregon.

Printed

in

the

United

States

of

America.

All

rights

reserved.

ontents

of

this

publication

may

not

be

reproduced

in

any

form

without

permis



sion

of

the

copyright

owner.

Type

114

Type

114

Type

114

Pulse

Genero or

-

7

r

CONTENTS

Warranty

Section

1

haracteristics

Section

2

Operating

Instructions

Section

3

ircuit

Description

Section

4

Maintenance

and

alibration

Section

5

Parts

List

and

Diagrams

A

list

of

abbreviations

and

symbols

used

in

this

manual

will

be

found

on

page

5-1.

hange

in



formation,

if

any,

is

located

at

the

rear

of

the

manual.

Type

114

SECTION

1

CHARACTERISTICS

In roduc ion

The

Type

114

Pulse

Generator

is

a

general

purpose

pulse

generator.

Transistorized

circuitry

is

used

throughout,

with

most

of

the

components

being

mounted

on

an

etched

circuit

board.

The

Type

114

Pulse

Generator

is

versatile.

The

repetition

rate,

width,

and

amplitude

of

the

output

pulse

are

individual



ly

selectable

by

range

and

by

variable

control

within

each

range.

Front-panel

connectors

are

provided

for

the

pulse

out



put,

trigger

output,

and

external

trigger

input.

A

single

front



panel

switch

selects

both

the

amplitude

range

and

polarity

of

the

output

pulse.

The

trigger

output

pulse

is

set

by

a

front



panel

switch

to

occur

on

the

desired

edge

(leading

or

trailing)

of

the

output

pulse.

In

cases

where

the

Type

114

is

set

for

a

pulse

width

longer

than

the

pulse

repetition

period,

a

built-

in

feature

automatically

counts

down

the

repetition

rate

to

permit

the

width

of

the

output

pulse

to

remain

at

the

value

selected

(such

operation

is

indicated

by

a

Width

>

Period

light).

In

addition,

two

Type

114's

can

be

connected

together

so

that

the

output

pulse

of

the

second

unit

is

delayed

by

the

pulse

width

(up

to

10

ms)

of

the

first

unit.

short

circuiting

the

OUTPUT

connector

will

not

damage

the

instrument.

WARNING

The

Type

114

should

never

be

connected

to

an

inductive

load,

or

any

load

that

will

produce

a

current

which

will

feed

back

into

the

instrument.

TABLE

1-1

Amplitude

Range

Pulse

on

Pulse

off

±1

to

3

V

≈

20

Ω

19

Ω

to

22

Ω

±3

to

10

V

28

Ω

to

48

Ω

30

Ω

to

95

Ω

Elec rical

Pulse

Period.

The

PERIOD

switch

and

associated

VARI



ABLE

control

provide

continuously

variable

pulse

periods

from

1

µ

sec

to

100

msec

(pulse

repetition

rates

from

one

mil



lion

pulses

per

second

to

10

pulses

per

second).

An

EXTER



NAL

TRIGGER

position

on

the

PERIOD

switch

permits

exter



nal

control

of

the

pulse

period.

With

the

VARIABLE

control

at

the

AL

end

of

its

range

and

the

WIDTH

>

PERIOD

light

unlit,

the

period

accuracy

is

within

±3%

of

the

indicated

value.

Jitter

is

typically

less

than

0.05%

of

pulse

period

+2

ms.

Pulse

Wid h.

The

WIDTH

switch

and

associated

VARI



ABLE

control

provide

continuously

variable

pulse

widths

from

l

00 n

sec

to

10

msec.

With

the

width

VARIABLE

control

at

the

AL

end

of

its

range,

the

width

accuracy

is

within

±3%

of

indicated

value.

Jitter

is

typically

less

than

0.05%

plus

½

nsec.

An

additional

SQUARE

WAVE

position

on

the

WIDTH

switch

disables

the

variable

width

feature

and

changes

the

output

to

a

square

wave

whose

repetition

rate

is

determined

by

the

PERIOD

controls.

Period

error

in

the

square

wave

mode

is

<

±5%.

Ou pu

Polari y

and

Ampli ude.

The

AMPLITUDE

switch

provides

for

either

polarity

output

with

two

amplitude

ranges

(1

V

to

3

V

and

3

V

to

10

V).

The

VARIABLE

control

permits

the

output

to

be

varied

within

the

voltage

ranges.

Aber



rations

(overshoot,

rolloff,

preshoot,

or

ringing)

amount

to

less

than

5%

at

maximum

amplitude.

Ou pu

Impedance.

The

output

impedance

of

the

Type

114

is

given

in

Table

1-1.

The

figures

given

are

typical

and

are

dependent

upon

the

setting

of

the

AMPLITUDE

—

VARI



ABLE

control.

Load

impedance

is

not

critical.

Temporarily

Ex ernal

Trigger

Inpu .

External

triggering

requires

a

positive

trigger

signal

of

2

to

20

volts

and

having

a

risetime

of

1

µ

sec

or

less.

Triggering

signals

up

to

2

Mc

may

be

used.

Trigger

Ou pu .

The

trigger

output

pulse

into

an

open

circuit

is

approximately

3

volts;

into

a

50

Ω

termination,

the

trigger

output

pulse

is

approximately

'/

2

volt.

A

front-panel

switch

allows

the

output

trigger

pulse

to

be

set

to

occur

at

the

leading

edge

or

the

trailing

edge

of

the

main

pulse.

Inpu

Power

Requiremen s.

≈

15

watts;

50

to

400

cps,

94.5

to

137.5

or

189

to

275

volts,

ac.

Warm-up

Time

at

+25°

±5° .

Five

minutes

for

rated

accuracies.

Environmen al

Opera ing

Temperature

Altitude

Non-Opera ing

Temperature

Altitude

Mechanical

Dimensions

onnectors

Accessories

0°

to

+50°

15,000

feet

maximum

—

40°

to

+65°

50,000

feet

maximum

Approximately

9"

X

6"

X

12

½"

overall

Front-panel

connectors

are

BN

type.

See

standard

accessory

lists

in

this

manual

for

accessories

supplied

with

each

instrument.

For

optional

accessories,

see

the

current

Tektronix,

Inc.

catalog.

1-1

Charac eris ics

—

Type

114

GLOSSARY

OF

TERMS

MPPS

Bistable

(multivibrator)

alibrate

A

circuit

that

has

two

stable

states

and

requires

two

input

pulses

to

complete

a

cycle.

To

check

or

correct

the

graduation

ac



curacy

of

quantitative

indicators.

AL

(calibrated)

position

An

index

position

to

which

an

otherwise

ungraduated

control

is

set

when

a

quanti



tative

measurement

must

be

made.

atching

or

clamping

diode

Establishes

the

+

or

—

extremity

of

a

volt



age

excursion.

ount-down

(of

pulses)

circuit

Delayed

pulse

Overshoot

PPS

Preshoot

Pulse

amplitude

Pulse

duration

A

circuit,

such

as

a

bistable,

whose

output

consists

of

pulses

fewer

in

number

(usu



ally

a

submultiple)

than

the

pulses

applied

to

the

input(s).

A

pulse

occurring

after

a

preselected

in



terval

following

an

event

used

as

a

time

reference

point.

Delayed

trigger

Duty

factor

(of

pulses)

Enabling

pulse

External

trig



ger

(pulse)

Falltime

Generally,

a

narrow,

delayed

pulse.

For

periodic

pulses,

the

duty

factor

(often

called

duty

cycle)

is

equal

to

the

duration

(width)

of

a

pulse

divided

by

the

pulse

period.

A

pulse

which

opens

a

normally

closed

electric

gate,

or

otherwise

permits

an

oper



ation

for

which

a

pulse

input

is

a

neces



sary

condition.

An

enabling

pulse

derived

from

a

source

external

to

the

circuit

or

equipment

where

a

particular

operation

requires

an

enabling

pulse

with

certain

characteristics

(time

de



layed,

duration,

etc.).

The

time

required

by

pulse

waveform

to

fall

from

90%

of

its

maximum

value

to

10%

of

its

maximum

value.

Not

neces



sarily

equal

to

risetime.

Jitter

KPPS

Pulse

period

Pulse

Repeti



tion

Frequency

Pulse

width

Quiescent

Ramp

voltage

Ringing

Risetime

Short-duration

instability

(of

a

signal);

ran



dom

small

departures

from

regularity.

Kilopulses

per

second.

Monostable

(multivibrator)

A

circuit

having

one

stable

and

one

semi



stable

state.

A

trigger

pulse

drives

the

circuit

into

the

semistable

state,

where

it

remains

for

a

predetermined

time

before

returning

to

the

stable

condition.

Sampling

system

Trigger

Megapulses

per

second.

When

changing

from

one

voltage

level

to

another,

a

momentary

excursion

greater

than

the

change

desired.

Pulses

per

second.

A

small

negative

excursion

immediately

preceding

a

positive-going

pulse,

or

vice

versa.

The

amplitude

of

a

pulse

is

any

term

indi



cating

the

magnitude

of

the

pulse.

The

time

interval

between

the

first

and

last

instants

at

which

the

pulse

voltage

(or

current)

reaches

some

specified

percentage

of

the

peak

voltage

(or

current)

of

the

pulse.

The

pulse

period

in

a

sequence

of

periodic

pulses

is

the

elapsed

time

between

any

given

point

on

one

of

the

pulse

waveforms

and

the

same

point

on

the

following

pulse.

The

number

of

periodic

pulses

that

occur

in

a

given

unit

of

time.

Also

expressed

as

pulse

repetition

rate.

See

pulse

duration.

At

rest

—

specifically,

the

condition

of

a

circuit

when

no

input

signal

is

being

ap



plied

and/or

no

change

is

taking

place.

A

voltage

waveform

that

rises

at

a

steady

rate.

For

example,

at

10

volts

per

second..

High-frequency

damped

oscillations

caused

by

shock

excitation

of

high-frequency

res



onances,

or,

a

damped

oscillation

in

the

output

signal

of

a

system

as

a

result

of

a

sudden

change

in

the

input

signal.

The

risetime

of

a

pulse

is

taken

as

the

time

required

for

the

leading

edge

of

the

pulse

to

increase

from

10%

of

its

maximum

value

to

90%

of

its

maximum

value.

A

method

that

takes

amplitude

samples

from

a

repetitive

input

signal

with

each

sample

at

a

progressively

later

time,

then

reconstructs

these

samples

into

a

replica

of

the

original

waveform

at

a

much

lower

frequency.

A

signal

that

starts

action

in

another

circuit.

1-2

SECTION

2

OPERATING

INSTRUCTIONS

Fron -Panel

Con rols,

Indica ors,

and

Connec ors

(See

Fig.

2-1.)

The

function

of

each

item

on

the

Type

114

front

panel

is

given

in

the

following

tabulation.

POWER

Switch

This

toggle

switch

completes

the

circuit

to

the

primary

of

the

power

transformer.

Indicator

The

white

lamp

to

the

right

of

the

POWER

switch

lights

when

the

Type

114

is

en



ergized.

PERIOD

Switch

This

switch

selects

the

basic

range

of

pulse

period.

When

the

switch

is

set

to

EXTERNAL

TRIGGER

—

INPUT,

the

Type

114

provides

width

and

amplitude

control

for

externally

generated

pulses

applied

to

the

INPUT

connector.

Note

that

“

100

mS"

does

no

indicate

a

switch

position,

but

is

instead

an

index

for

the

VARIABLE

control.

VARIABLE

This

control

has

a

range

of

10:1

or

more,

ontrol

and

provides

continuous

coverage

between

the

steps

of

the

PERIOD

switch.

EXTERNAL

BN

connector

to

which

the

external

trig-

TRIGGER-

ger

is

applied

when

externally

triggering.

INPUT

on



nector

WIDTH

Switch

This

switch

selects

the

basic

ranges

of

pulse

width.

Note

that

the

word

“

10

mS

”

does

no

indicate

a

switch

position,

but

is

instead

an

index

for

the

associated

VARI



ABLE

control.

When

the

WIDTH

switch

is

set

to

SQUARE

WAVE,

the

output

of

the

Type

114

is

a

square

wave

whose

period

is

selected

by

the

PERIOD

controls.

VARIABLE

This

control

provides

continuous

cover-

ontrol

age

between

the

steps

of

the

WIDTH

switch

and

has

a

range

of

10:1

or

greater.

WIDTH

>

With

the

flexibility

provided,

it

is

possible

PERIOD

In-

to

set

the

controls

so

that

the

width

of

the

dicator

light

pulse

selected

exceeds

the

period

selected.

When

this

occurs,

the

Type

114

counts

down

the

repetition

rate

and

lights

the

WIDTH

>

PERIOD

light.

The

pulse

width

remains

as

selected,

but

the

pulse

period

is

no

longer

that

selected

by

the

PERIOD

controls.

AMPLITUDE

Switch

Selects

the

two

basic

voltage

ranges

and

the

polarity

of

the

output

signal.

VARIABLE

Provides

for

varying

the

output

amplitude

ontrol

within

the

range

selected

by

the

AMPLI



TUDE

switch.

OUTPUT

Connec or

BN

connector

from

which

the

output

is

taken.

TRIGGER

Switch

This

switch

permits

the

operator

to

select

the

edge

of

the

output

pulse

at

which

the

trigger

pulse

occurs.

onnector

BN

connector

from

which

the

trigger

pulse

output

is

taken.

Firs

Time

Opera ion

The

following

procedures

are

designed

to

acquaint

the

operator

with

the

operation

of

the

Type

114.

1.

Set

the

three

VARIABLE

controls

extreme

counterclock



wise.

Set

the

PERIOD

switch

to

100 µ

S,

the

WIDTH

switch

to

SQUARE

WAVE,

and

the

AMPLITUDE

switch

to

the

"

+

1

TO

+3

V"

position.

2.

onnect

the

OUTPUT

connector

of

the

Type

114

to

the

vertical

input

of

an

oscilloscope

(Tektronix

Type

547/1

Al

or

equivalent)

by

means

of

a

50

ft

coaxial

cable.

Terminate

the

coaxial

cable

at

the

oscilloscope

end

with

a

50

ft

ter



mination

(Tektronix

Part

No.

011-049

or

equivalent).

Make

sure

the

input

voltage

switch

is

set

to

match

the

voltage

of

the

power

source

in

use

(115

or

230

V

ac).

See

Fig.

2-2.

At



tach

the

power

cord.

3.

Apply

power

to

the

Type

114

and

the

oscilloscope.

Set

the

oscilloscope

TIME/DIV

or

TIME/ M

switch

to

.1

mSE

and

obtain

a

stable

display.

4.

Set

the

WIDTH

switch

to

10

µ

S.

Turn

the

associated

VARIABLE

control

clockwise

and

note

the

increase

in

pulse

width.

When

the

control

is

turned

so

that

the

pulse

width

exceeds

100

/

j

.S,

the

WIDTH

>

PERIOD

lamp

lights.

5.

Operate

the

PERIOD,

WIDTH,

and

AMPLITUDE

switches

and

controls

throughout

their

ranges

and

check

the

results

with

the

oscilloscope.

Using

he

Type

114

as

a

Source

of

Delayed

Trigger

The

use

of

the

Type

114

as

a

source

of

delayed

trigger

may

be

demonstrated

as

follows:

1.

Apply

a

1

Kpps

signal

(such

as

the

output

of

the

oscillo



scope

calibrator)

through

a

BN

T

connector

and

appro



priate

coax

cables

to

the

external

trigger

input

connectors

of

2-1

Opera ing

Ins ruc ions

—

Type

114

Fig.

2-1.

Fron

panel

con rol*.

Fig.

2-2.

Type

114

rear

pon

e

l.

2-2

Opera ing

Ins ruc ions

—

Type

114

both

the

Type

114

and

the

oscilloscope

(see

Section

1

for

external

trigger

characteristics

required).

2.

Obtain

an

externally

triggered

sweep

on

the

oscillo



scope.

3.

onnect

a

coaxial

cable

between

the

TRIGGER

OUT



PUT

connector

of

the

Type

114

and

the

vertical

input

of

the

oscilloscope.

4.

Turn

the

Type

114

PERIOD

switch

to

EXTERNAL

TRIG



GER.

Set

the

WIDTH

switch

to

100

µ

S.

Turn

the

WIDTH

variable

control

to

AL.

Set

the

oscilloscope

VOLTS/ M

switch

to

1

volt.

Set

the

TIME/ M

switch

to

.1

mSE .

5.

Set

the

Type

114

TRIGGER

switch

to

TRAILING

EDGE.

A

narrow

trigger

pulse

approximately

3

volts

in

amplitude

should

be

visible

approximately

1

cm

from

the

start

of

the

oscilloscope

trace.

6.

Turn

the

WIDTH

—

VARIABLE

control

and

note

that

the

displayed

trigger

pulse

can

be

delayed

from

10 µ

sec

to

more

than

100

µ

sec

from

the

start

of

the

trace.

By

using

the

5

basic

ranges

of

the

WIDTH

switch

and

by

turning

the

as



sociated

VARIABLE

control,

it

is

possible

to

delay

the

trigger

pulse

over

a

range

from

approximately

150

nanoseconds

to

10

milliseconds.

Swi ching

he

Power

Transformer

Primary

Con



nec ions

A

switch

on

the

rear

of

the

Type

114

chassis

permits

switching

the

power

transformer

connections

for

operation

on

either

94.5-137.5

(115

V

ac

nominal)

or

189-275

volts

ac

(230

V

ac

nominal).

Be

sure

the

correct

fuse

is

installed.

2-3

NOTES