Pulse Generator

114

Tektronix 114 User Manual

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SECTION

1

CHARACTERISTICS

Introduction

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

Electrical

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

CAL

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

Width.

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

CAL

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%.

Output

Polarity

and

Amplitude.

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.

Output

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

External

Trigger

Input.

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

Output.

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.

Input

Power

Requirements.

≈

15

watts;

50

to

400

cps,

94.5

to

137.5

or

189

to

275

volts,

ac.

Warm-up

Time

at

+25°C

±5°C.

Five

minutes

for

rated

accuracies.

Environmental

Operating

Temperature

Altitude

Non-Operating

Temperature

Altitude

Mechanical

Dimensions

Connectors

Accessories

0°C

to

+50°C

15,000

feet

maximum

—

40°C

to

+65°C

50,000

feet

maximum

Approximately

9"

X

6"

X

12

½"

overall

Front-panel

connectors

are

BNC

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

Questions and Answers:

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Tektronix 114 Specifications

General

Brand	Tektronix
Model	114
Category	Pulse Generator
Language	English

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