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BRADLEY

1^

electronics

j

INSTRUCTION

MANUAL

u

PERIOD

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E,-

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m

G.

S.

E.

BRADLEY

LTD.

Electral

House,

Neasden

Lane,

London,

N,W.10

Telephone:

01

^50

TBII

Telex:

25583

AMENDMENT

RECORD

SHEET

Incorporation

of

an

Amendment

List

in

this

publication

is

to

be

recorded

by

signing

in

the

appropriate

column

and

inserting

the

date

of

making

the

amend

ments.

A.

L.

AMENDED

BY

DATE

Although

every

care

has

been

taken

to

ensure

that

the

information

contained

in

this

manual

is

accurate

at

the

time

of

going

to

press,

continuous

development

may

result

in

equipment

changes

and

consequent

inaccuracies

in

the

Manual.

The

Company

reserves

the

right

to

institute

such

changes

as

and

when

necessary

without

prior

notification.

Reproduction

of

this

document,

or

any

part

of

it,

without

written

permission

from

G.

&

E.

Bradley

Ltd.,

is

prohibited.

GUARANTEE

We

will

make

good

by

repair

or

replacement

any

defects

in

products

of

our

manufacture

not

caused

by

wear

and

tear,

accident,

mis-use

or

neglect,

provided.

(1)

that

such

defects

are

brot^ht

to

our

notice

not

later

than

12

months

from

the

date

the

goods

were

first

despatched

and

(2)

that

no

unauthorized

repair

or

replacement

has

been

previously

carried

out

or

attempted.

We

do

not

guarantee

the

products

of

other

manufacturers

which

form

part

of

the

goods

of

our

manufacture,

but

will

pass

on

to

our

customer

the

full

benefits

we

have

received

in

repsect

of

guarantees

offered

by

such

other

manufacturers

in

respect

of

their

goods.

This

guarantee

is

given

in

lieu

of

any

warranty

implied

by

statute

or

otherwise,

and

our

liability

thereunder

is

expressly

limited

to

the

cost

of

the

repair

or

replacement

made

by

us

or

to

our

order.

G.

and

E.

Bradley

Limited,

Electral

House,

Neasden

Lane,

London,

N.

W.

10.

CONTENTS

SECTION

1

1.1

INTRODUCTION

Performance

Page

1

SECTION

2

SPECIFICATION

SECTION

3

OPERATING

INSTRUCTIONS

3.1

Installation

3.

2

Push

Buttons

3.

3

Rotary

Switches

3.4

Functional

Description

3.5

'A'

Functions

3.

6

'B'

Functions

3.

7

Output

Functions

SECTION

4

TECHNICAL

DESCRIPTION

4.1

Timing

Section

4.

2

Output

Section

4.3

Power

Supplies

SECTION

5

SERVICING

AND

ADJUSTMENTS

5.1

General

5.2

Mechanical

Details

5.

3

Test

Equipment

5.4

Power

Supplies

5.

5

DC

Voltage

Test

5.

6

Input

and

Delay

Functions

5.7

Timing

5.

8

Pulse

Shape

5.

9

Offset

Zero

Check

13

13

18

19

21

21

21

21

21

22

23

24

25

26

SECTION

6

PARTS

LIST

27

(ill)

LIST

OF

ILLUSTRATIONS

FRONTISPIECE

FIG.

A

and

B

FIG.

1

FIG.

2

FIG.

3

FIG.

4

FIG.

5

FIG.

6

FIG.

6

(a)

FIG.

6

(b)

FIG.

6

(c)

FIG.

7

FIG.

8

FIG.

9

FIG.

10

Showing

Advantage

of

Source

Termination

Showing

ECL

Logic

Circuit

Showing

Logic

Levels

of

ECL

Gate

Multi-Vibrator

Waveforms

Monostable

Waveforms

Differentiator

Waveforms

Timing

Circuit

Period

Switch

Arrangement

Delay

A

+

B,

Width

A

+

B.

Switch

Arrangement

Delay/Period.

Switch

Arrangement

Output

Circuit

Power

Supplies

System

Output

Circuit

Printed

Circuit

Board

(iv)

SECTION

1

INTRODUCTION

1.1

PERFORMANCE

The

Bradley

233

twin

channel

pulse

generator

provides

0.

5Hz

to

50MHz

at

up

to

10

volts

positive

or

negative

into

50fi.

Resistive

or

reactive

loads

of

any

magnitude

may

be

driven.

The

50n

source

impedance

('back

match')

at

the

generator

will

always

produce

a

true

50fi

source

at

the

end

of

the

cable.

The

internal

50J2

can

be

switched

out

to

provide

full

10

volts

into

a

5052

external

load.

Output

Baseline

offset

provides

any

pulse

amplitude

from

0.

5

volts

to

10

volts

within

the

limits

±10

volts.

The

parallel/serial

delay

allows

pulse

positions

to

be

adjusted

independ

ently

or

in

groups.

The

internal

sum

facility

allows

the

two

outputs

to

be

summed

without

reduction

in

amplitude

or

refelction

in

the

interconnecting

cables.

This

facility

provides

stepped

or

super-imposed

pulses

up

to

20

volts

maximum

amplitude.

Other

features

of

the

233

are

the

internal

burst

facility

by

using

the

B

delay

generator

as

an

oscillator

to

be

gated

by

the

A

width.

The

adjustable

level

control

and

slope

selection

per

mits

triggering

off

any

point

on

the

input

waveform.

This

operates

down

to

zero

frequency

whether

on

external

trigger,

gate

or

external

width.

A

Trigger

Indicator

lights

when

the

input

is

correctly

triggered.

Simplicity

of

operation

is

provided

by

the

square-wave

facility

which

eliminates

the

need

to

adjust

the

delay

and

width

controls.

The

B

period

oscillator

can

be

free-run

independently

of

the

A

section

thus

providing

virtually

two

pulse

generators

in

one

instrument.

1

-

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

2.10

2.11

2.12

2.13

2.14

2.15

2.16

2.17

2.18

Repetition

Rate

External

Input

Manual

Trigger

Light

Pre-pulse

Output

Delay

and

Width

Configurations

Internal

Burst

Pulse

Delay

Pulse

Width

Timing

Jitter

Timing

Drift

Output

Configurations

Output

Amplitude

Polarity

Baseline

Offset

Rise

and

Fall

Times

Waveform

Aberration

Output

Protection

SECTION

2

SPECIFICATION

0.

5Hz

to

50MHz

(8

ranges).

DC

coupled.

Sensitivity

0.4V

peak

to

peak.

Minimum

pulse

width

5ns.

Slope

selection.

Level

variation

±4V.

Maximum

signal

50V

peak.

Trigger,

gate

and

external

width

modes

available.

Single

cycle,

burst

and

d.

c.

level

or

slope

modes

available

from

front

panel

push

button.

Indicates

correct

level

setting

when

an

external

input

is

supplied,

whether

used

for

triggering

or

gating.

Single

flash

when

manual

button

is

depressed.

Minimum

+2V

pulse

from

50

ohm

source.

Risetime

less

than

5ns.

Occurs

less

than

20ns

after

triggering

from

an

external

source.

Width

about

250ns

at

low

frequency

reducing

automatically

to

approximately

10ns

at

50MHz.

Two

delay

plus

width

chains.

May

be

driven

in

parallel

from

the

internal

or

external

period

signal,

or

in

series,

in

which

case

the

B

delay

triggers

off

the

trailing

edge

of

the

A

width.

B

delay

converts

to

a

period

oscillator,

gated

by

width

A.

20ns

to

Is.

(Pre-pulse

to

Main

pulse).

10ns

to

Is.

Maximum

duty

cycle

50%

at

minimum

vernier

increasing

to

80%

at

maximum

vernier.

Less

than

0.1%.

/

V

'

"f

^

6

'

^

^

Approximately

0.1%/°C.

Two

independent

output

channels.

Each

can

be

driven

from

A

and/

or

B

pulse

width

or

period

signal.

Each

has

polarity

and

comple

ment

selection,

independent

amplitude

and

offset

controls.

Continuously

variable

0.

5V

to

lOV

into

500.

Internal

summation

controlled

by

push

button.

Outputs

add

algebraically

into

output

2

and

output

1

becomes

non-operative.

Positive

or

negative.

0

to

-lOV

(Positive

pulse).

0

to

+10V

(Negative

pulse)

5ns

typical.

Less

than

±5%

at

amplitude

greater

than

2V

(with

500

termination).

Short

circuit

and

overload

protected.

-

3

-

2.19

2.

20

2.

21

Power

Supplies

Temperature

Ranges

Dimensions

100-125V

or

200-250V.

50/60Hz.

Approximately

35VA.

All

supplies

regulated.

Operation

0

to

50°C

Storage

-10

to+60°C.

2.22

Weight

For

Rack

Mounting

Height:

90mm

(3.1/2")

Width:

310mm

(12.1/4")

Depth:

280mm

(11")

5.5kg

(121b).

Overall

-

includes

feet

Handles

and

Controls.

115mm

(4.1/2")

332mm

(13.1/8")

322mm

(12.

3/4")

-

4

SECTION

3

OPERATING

INSTRUCTIONS

3.1

INSTALLATION

1.

Check

that

the

rear

panel

voltage

selector

switch

is

set

correctly

for

the

supply

voltage.

2.

Fuse

ratings:

for

200/250V

operation

-

0.

5A

(supplied)

for

100/125V

operation

-

lA.

3.

Supply

connections

Brown

-

Line

Blue

-

Neutral

Green/yellow

-

Earth

3.2

PUSHBUTTONS

1.

The

legend

above

any

push-button

refers

to

the

function

obtained

when

the

button

is

in.

2.

Black

buttons

occur

in

interactive

groups,

and

normally

only

one

button

should

be

in.

3.

White

buttons

are

mechanically

independent,

and

the

legend

below

a

button

refers

to

the

function

obtained

when

the

button

is

out.

It

is

screened

in

yellow

as

a

reminder.

4.

The

red

button

has

a

spring-return

action.

3.3

ROTARY

SWITCHES

1.

On

all

time

switches

the

nomimal

value

of

the

switch

setting

is

obtained

when

the

small

concentric

vernier

control

is

fully

anti-clockwise

in

the

'CAL'

position.

When

the

vernier

is

turned

clockwise

the

time

increases

until

it

overlaps

the

next

greater

range

setting;

or

on

the

longest

range,

overlaps

a

value

ten

times

greater

than

the

range

setting.

2.

Stable

pulses

can

be

guaranteed

only

when

the

delay

and

width

monostables

are

not

"counting

down".

It

is

important,

therefore,

to

keep

both

delay

and

width

of

a

pulse

somewhat

less

than

the

period.

If

the

delay

is

not

required,

set

it

to

lOnsec.

3.

Jitter,

or

at

high

frequencies,

moding

can

be

caused

by

any

delay

or

width

monostables

counting

down.

It

is

good

practice

to

keep

all

unused

delay

or

width

contols

set

to

lOnsec.

4.

On

the

output

amplitude

controls

the

nominal

value

of

the

switch

setting

is

obtained

with

the

vernier

fully

clockwise

in

the

'CAL'

position.

The

vernier

reduces

the

amplitude

until

it

overlaps

the

next

smaller

range

setting,

or

on

the

lowest

range,

until

it

is

less

than

0.

5V.

3.4

FUNCTIONAL

DESCRIPTION

1.

A

Section

This

section

determines

the

pulse

rate

for

the

rest

of

the

unit.

On

"Free

Run"

and

"Ext

Gate"

the

rate

depends

on

the

settings

of

the

PERIOD

switch

and

vernier.

On