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HEWLETTPACKARD

MODEL

8012A

PULSE

GENERATOR

This

manual

corresponds

to

instruments

with

the

serial

number

prefix:

G1121

and

below

COPYRIGHT

HEWLETT-PACKARD.GMBH

1971

703

BOBLINGEN,

HERRENBERGER

STR,

110,

WEST

GERMANY

08012-90000

PRINTED:OCTOBER

71

Mode!

8012A

Section-

Table

1—1.

Specifications.

PULSE

CHARACTERISTICS

(500

source

and

load

impedance)

Transition

Times:

5nS

-

0.5S

in

four

ranges.

Ranges

are

common

for

rise

and

fall

times

but

independent

verniers

provide

separate

control

of

rise

and

fall

time

within

each

range

upto

maximum

ratios

of

100:1

or

1:100,

Linearity:

For

transition

times

>

30nS

maximum

deviation

from

a

straight

line

between

the

10%

and

90%

points

is

less

than

5%

of

pulse

amplitude.

Overshoot

and

Ringing:

<

±

5%

of

pulse

amplitude.

Preshoot:

<

±

5%

of

pulse

amplitude.

Pulse

Width:

<

IQnS

to

IS

in

four

ranges.

Vernier

provides

continuous

adjustment

between

ranges.

Width

Jitter:

<

0.1%

+

50pS

on

any

width

setting.

Maximum

Duty

Cycle:

>

75%

from

1Hz

to

10MHz,

decreasing

to

>

40%

at

50MHz.

Maximum

Output:

5V

across

5012,

(10V

across

open

ciruit).

Output

circuit

protected,

cannot

be

damaged

by

shorting.

Attenuator:

Four-step

attenuator

provides

the

ranges:

0.2

—

0.5V,

0.5

—

IV,

1

—2V

and

2

—

5V.

Vernier

provides

continuous

adjustment

between

steps.

Polarity:

Positive

or

negative,

selectable.

Source

Impedance:

5012

±

10%,

shunted

by

(typically)

20pF.

DC

Offset:

±

2.5V

across

5012

load.

Independent

of

attenuator

and

amplitude

vernier

settings

and

may

be

switched

off.

Pulse

Delay:

<

35nS

to

IS

(with

respect

to

trigger

output)

in

four

ranges;

vernier

provides

continuous

adjustment

between

ranges.

Delay

Jitter:

<

0.1%

+50pS

on

any

delay

setting.

REPETITION

RATE

AND

TRIGGER

Repetition

Rate:

1Hz

to

50MHz

in

four

ranges.

Vernier

provides

continuous

adjustment

between

ranges.

Period

Jitter:

<0.1%

+50pS

on

any

repetition

rate

setting.

Square

Wave:

0.5Hz

to

25MHz

in

four

ranges.

Duty

cycle

50%

±5%

upto

1MHz,

tolerance

increases

to

±

15%

at25MHz.

Trigger

Output:

Amplitude:

>+1V

across

5012.

Width:

16nS±

lOnS.

Suitable

for

triggering

another

8012A.

EXTERNALLY

CONTROLLED

OPERATION

External

Triggering

Repetition

Rate:

0

to

50MHz.

For

square

wave

output,

frequency

divided

by

factor

2.

Trigger

input:

Sinewaves

>

1.5Vpp

(

zero

dc

)

or

pulses

>

0.8V,

(positive

or

negative)

at

least

7nS

wide.

Delay:

25nS

±

8nS

between

leading

edge

of

trigger

input

and

trigger

output

signals.

Maximum

Input

Amplitude:

<±7V

Input

Impedance:

5012

±

10%

Coupling:

DC-Coupled.

Manual:

Front

panel

push

button

for

single

pulse.

Page

1—1

Section

1

Model

8012A

Table

1—1.

Specifications.

Continued.

Gating

Synchronous

Gating:

Gating

signal

turns

generator

"on".

First

trigger

output

pulse

is

coincident

with

leading

edge

of

gate

pulse.

Last

output

pulse

is

always

generated

with

normal

width

even

if

the

gate

pulse

ends

during

the

generation

of

the

output

pulse.

Gate

Input:

DC-coupled;

voltage

at

open

circuit

gate

connector

approximately

+1.8V.

Shorting

current

<

12mA.

Input

impedance

approximately

1600.

Gate

Input

Signal:

Voltage

>

+1.5V

or

resistor

>

30012

from

gate

input

to

ground

enables

the

repetition

rate

generator.

Voltage

<

+0.8V

or

resistor

<

1500

disables

the

repetition

rate

generator.

Gate

input

is

TTL

compatible.

Maximum

Input

Signal:

<±

5V

External

Width

Input

External

Width:

Output

pulse

width

determined

by

the

width

of

drive

input

signal.

Transition

times

and

amplitude

are

selec¬

table.

Repetition

rate

generator

running

provides

trigger

output

but

these

trigger

pulses

are

not

related

to

the

pulses

at

the

output

connector.

RZ

Mode:

External

input

(switched

to

delay

generator)

determines

pulse

period.

Transition

times,

delay,

width,

and

amplitude

are

selectable.

Trigger

output

is

not

related

to

RZ

Mode

output.

Input

Signal:

Input

Impedance

500;

DC-coupled.

Signal

>

+1V,

at

least

7nS

wide,

provides

output

signal.

Maximum

Input

Signal:

<±

5V.

GENERAL

Operating

Temperature

Range:

0°C

to

+55°C

Power

Requirements:

115

or

230V

+10%,

-15%,

48

to

440

Hz,

70VA

maximum.

Weight:

Net91bs.

(4kg,),

shipping

14,61bs.

(6,5kg.)

Dimensions:

7.9

in.

wide,

5.6

in.

high,

13

in.

deep.

(200

x

142

x

30mm.)

Page

1—2

Model

8012A

Section

I

GENERAL

INFORMATION

1-1

INTRODUCTION

1—2

The

Hewlett-Packard

Model

8012A

Pulse

Generator

is

a

multi-purpose

pulse

source,

capable

of

generating

a

wide

variety

of

output

pulse

waveforms,

either

as

single

pulses

or

as

pulse

trains

with

repetition

rates

from

1

Hz

to

50

MHz.

The

transition

times,

amplitude,

width

and

polarity

of

the

output

pulse(s)

may

be

varied

as

required

by

means

of

easily

identified

front

panel

controls.

The

pulse

width

may

be

deter¬

mined

by

the

pulse

generator's

width

control

(normal

mode),

by

external

signals

(external

width

mode),

or

by

switching

the

width

control

to

the

square

wave

position

—

this

causes

the

output

pulse

width

to

equal

one

half

the

pulse

period.

With

the

offset

control

in

the

off

position

the

square

wave

is

symmetrical

above

and

below

zero

volts.

All

the

output

pulses

may

have

their

baseline

shifted

above

and

below

the

zero

volt

reference

line

by

means

of

the

front

panel

offset

controls.

Trigger

pulses

are

available

for

synchronising

external

circuits

and

a

delay

control

enables

the

delay

time

between

the

trigger

and

output

pulses

to

be

varied

as

required.

Synchronous

gating

of

the

trigger

and

output

pulses

is

possible

by

applying

a

pulse

to

the

gate

input

socket.

1—3

Three

modes

of

operation

are

possible

as

follows:

a.

Normal

Mode:

In

this

mode

the

internal

oscillator

determines

the

repetition

rate

of

the

output

pulses.

The

oscillator

may

be

triggered

inter¬

nally,

externally,

or

manually;

it

may

also

be

gated.

A

trigger

pulse

is

generated

for

each

output

pulse

and

the

delay

between

them

may

be

varied.

b.

External

Width

Mode:

In

this

mode

external

pulses

applied

to

the

input

socket

on

the

rear

panel

determine

the

width

and

repetition

rate

of

the

output

pulses.

Gating

is

not

possible.

Note

that

the

pulse

available

at

the

trigger

output

socket,

being

derived

from

the

internal

oscillator,

is

not

related

to

the

external

width

output.

Figure

1-1

HP

Model

8012A

Pulse

Generator

Page

1—3

Section

Model

8012A

1-8

MANUAL

IDENTIFICATION

1—7

This

instrument

carries

a

10-character

serial

number

on

the

rear

panel,

the

first

5

characters

of

which

are

termed

the

serial

number

prefix.

If

the

prefix

does

not

agree

with

that

quoted

on

the

title

page,

reference

should

be

made

to

the

change

sheets

supplied

with

the

manual.

To

obtain

further

information

for

any

instru¬

ment,

contact

the

nearest

Hewlett-Packard

Sales/Service

Office,

always

specify

the

model

number

and

complete

serial

number.

1-8

ORDERING

ADDITIONAL

MANUALS

1—9

One

manual

is

shipped

with

each

pulse

generator.

Additional

manuals

may

be

purchased

from

the

local

Hewlett-Packard

field

office

(see

list

at

rear

of

this

manual

for

addresses}.

Specify

the

model

number

complete

serial

number

prefix,

and

HP

stock

number

provided

on

the

title

page.

c,

RZ

Mode:

In

this

mode

external

pulses

applied

to

the

input

socket

on

the

rear

panel

determine

the

repet¬

ition

rate

of

the

output

pulses.

All

other

output

pulse

parameters

are

determined

by

the

pulse

generator's

front

panel

controls,

but

gating

is

not

possible.

Note

that

the

pulse

available

at

the

trigger

output

socket,

being

derived

from

the

internal

oscillator,

is

not

related

to

the

RZ

output.

1-4

ACCESSORIES

AVAILABLE

1—5

Electronic

test

equipment,

cables,

connec¬

tors,

adapters,

and

other

accessory

items

are

available

from

Hewlett-Packard.

For

more

information

on

specific

items

consult

the

Hewlett-Packard

Catalog

or

Sales/

Service

Office.

Figure

2-1

Pulse

Generator

and

Supplied

Accessories

Page

1—4

Model

8012A

Section

11

2—1

INITIAL

INSPECTION

2—2

Inspect

the

instrument

for

physical

damage

and

check

its

operation

as

soon

as

possible

after

delivery.

Section

IV

contains

performance

check

procedures

which

will

verify

instrument

operation

within

the

published

specifications.

This

check

is

suitable

for

incoming

quality

control

inspection.

If

physical

damage

is

evident,

or

the

instrument

does

not

meet

specifica¬

tions

when

received,

notify

the

carrier

and

the

nearest

Hewlett-Packard

Sales/Service

Office

(see

list

at

rear

of

this

manual).

The

Sales/Service

Office

will

arrange

for

repair

or

replacement

without

waiting

for

settlement

of

a

claim

with

the

carrier.

The

certification

and

warranty

statements

for

all

HP

instruments

are

on

the

inside

front

cover

of

this

manual.

2—3

The

instrument

is

delivered

complete

with

the

following

items:

HP

Stock

Numbers

Power

Cord

8120—1692

Fuse,

0.5A

for

230V

operation.

2110-0202

Fuse,

1

A

for

115V

operation

2110-0007

2-4

PREPARATION

FOR

USE

2—5

Power

Source

Requirements

2—6

The

Model

8012A

may

be

operated

from

an

ac

source

of

115

or

230

volts

+10%,

—15%,

at

48

to

400

Hz.

Power

dissipation

is

70VA

maximum.

Carry

out

the

following

procedure

if

it

is

required

to

change

the

operating

voltage:

a)

Disconnect

the

power

cable

from

the

instrument.

b)

Slide

the

safety

window

to

the

left.

c)

Remove

the

fuse

by

pulling

the

lever

marked

FUSE

PULL;

this

also

releases

the

voltage

selector

switch.

d)

Slide

the

voltage

selector

switch

to

the

position

required

(i.

e.

115

or

230).

e)

Place

the

appropriate

fuse

in

the

fuse

holder

and

push

the

lever

back

into

position.

f)

Slide

the

safety

window

to

the

right

and

insert

the

power

cable.

2—6

cont..

CAUTION

Ensure

that

the

number

visible

on

the

slide

switch

and

the

fuse

value

correspond

to

the

line

voltage

used

before

switching

the

instrument

ON;

otherwise,

the

instrument

may

be

damaged.

2—7

Power

Cable

2-8

The

Hewlett-Packard

Model

8012

A

is

equipped

with

a

3

-

wire

power

cable,

which,

when

connected

to

an

appropriate

receptacle,

grounds

the

instrument,

cabinet

and

panels.

To

preserve

this

protec¬

tion

feature

when

operating

the

instrument

from

another

type

of

outlet

without

ground,

use

an

appro¬

priate

adapter

and

connect

the

ground

lead

to

an

external

ground.

2—9

Temperature

Requirements

2-10

The

Hewlett-Packard

Model

8012A

uses

solid-state

components

and

requires

no

special

cooling.

The

instrument

operates

within

specifications

when

the

ambient

temperature

is

between

0°C

(32°F)

and

55°C

(131°F).

The

pulse

generator

may

be

stored

at

temperatures

between

—40°C

(-40°F)

and

75°C

(167°F).

2-11

REPACKING

2—12

The

original

shipping

carton

and

packing

material

can

be

used

for

reshipment.

The

Hewlett-

Packard

Sales/Service

Office

will

also

provide

infor¬

mation

and

recommendations

on

materials

to

be

used

if

the

original

packing

material

is

not

available

or

is

damaged.

If

the

instrument

is

to

be

shipped

to

a

Hewlett-Packard

Sales/Service

Office

for

repair,

attach

a

tag

showing

owner,

model,

serial

number,

and

repairs

required.

Page

2—1

Section

III

Model

8012A

SECTION

III

OPERATING

INSTRUCTIONS

3-1

INTRODUCTION

3-2

Figure

5-1

shows

the

location

of

the

controls

and

connectors;

the

reference

numbers

used

appear

when

appropriate

in

the

following

text

in

bold

type.

As

previously

explained,

there

are

three

operating

modes

and

the

necessary

operating

procedure

for

each

will

now

be

described.

Reference

may

also

be

made

to

the

block

diagram,

figure

5-2.

3-3

NORMAL

MODE

3—4

There

are

five

ways

of

operating

in

the

normal

mode:

1.

Where

the

repetition

rate

is

determ¬

ined

by

the

internal

oscillator,

inter¬

nally

triggered.

2.

As

above,

but

with

the

oscillator

triggered

externally.

3.

Manually

triggered,

4.

In

each

of

the

above,

square

wave

output

(pulse

width

=

pulse

period/2)

may

be

selected

instead

of

the

variable

pulse

width.

5.

The

outputs

obtained

above

may

be

gated.

All

output

pulses

are

preceded

by

a

trigger

pulse

(TRIGGER

OUTPUT

socket

17).

The

delay

is

fixed

at

35nS

for

square

waves

but

may

otherwise

be

adjusted

by

the

PULSE

DELAY

switch

6

and

VERNIER

7.

3-5

Internal

Trigger

3—6

The

appropriate

circuits

and

controls

are

shown

in

figure

3-1.

Use

the

following

procedure

to

obtain

an

output

similar

to

that

shown

in

figure

3—2.

a.

Set

the

Mode

Selector

21

to

N.

b.

Set

the

PULSE

PERIOD

switch

1

to

the

range

required,

then

adjust

the

VERNIER

2

to

obtain

the

exact

pulse

period.

c.

Set

the

PULSE

DELAY

switch

6

to

the

range

required,

then

adjust

the

VERNIER

7

until

the

delay

time

required

between

the

trigger

and

output

pulses

is

obtained.

The

delay

time

must

always

be

less

than

the

pulse

period.

d.

Set

the

PULSE

WIDTH

switch

10

to

the

range

required,

then

adjust

the

VERNIER

11

to

obtain

the

exact

pulse

width.

e.

Set

the

AMPLITUDE

switch

4

to

the

range

required,

then

adjust

the

VERNIER

9

to

obtain

the

exact

amplitude.

f.

Set

the

TRANSITION

TIME

switch

3

to

the

range

required,

then

adjust

the

RISETIME

vernier

8

and

FALLTIME

vernier

12

for

the

exact

risetime

and

falltime

required.

g.

Set

the

POLARITY

switch

19

to

the

position

+

to

obtain

positive

output

pulses

or

to

—

to

obtain

negative

output

pulses,

h.

If

the

baseline

of

the

output

pulses

is

to

be

zero

volts,

set

the

OFFSET

switch

13

to

OFF.

If

the

baseline

is

to

be

positive

or

negative,

set

the

OFFSET

switch

13

to

ON

and

rotate

the

vernier

14

until

the

required

offset

voltage

is

obtained.

ortser

o

vtimtp

ft

Figure

3-1

Operation

Block

Diagram:

Normal

Mode

-

Internal

Trigger

Page

3—1

Model

8012A

Section

III

_A_/l

Pulse

Width

Trigger

output

pulses

(TRIGGER

OUTPUT

17!

Positive

output

pulses

(OUTPUT

20)

No

baseline

offset.

OV

-V

+v

tv

OV

r

/

N.

Negative

output

pulses

\

(OUTPUT

20)

Positive

output

pulses

\

positive

baseline

offset.

Positive

Output

pulses

Negative

baseline

offset.

Negative

output

pulses

Positive

baseline

offset.

Figure

3-2

Output

Waveforms:

Normal

Mode

-

Internal

Trigger,

3—7

External

Trigger

3—8

The

appropriate

circuits

and

controls

are

shown

in

figure

3--3.

Use

the

following

procedure

to

obtain

an

output

similar

to

that

shown

in

figure

3-4.

H/iS£

OIL

Ay

6

PULSt

worn

:0

pulse

period

i

vefiwifr

y

vtsmza

n

arrscj

u

VCRRtCP

14

Figure

3-3

Operation

Block

Diagram:

Normal

Mode

-

External

Trigger.

>

*!V

OV

_

A

Trigger

output

pulses

(TRIGGER

OUTPUT

17)

+V

OV

<

36itS

to

1

Sac.

Positive

output

pulses

(OUTPUT

20)

a.

Set

the

Mode

Selector

21

to

N.

b.

Apply

suitable

trigger

pulses

to

the

TRIGGER

INPUT

socket

16.

c.

Set

the

PULSE

PERIOD

switch

1

to

EXT+

for

positive

trigger

input

pulses

or

to

EXT-

for

negative

trigger

input

pulses.

d.

Set

the

delay

between

the

trigger

and

output

pulses

as

described

in

para¬

graph

3—6,

e.

Set

the

width,

amplitude,

risetime,

falltime,

polarity

and

offset

of

the

output

pulses

as

described

in

para¬

graph

3-6.

Figure

3-4

Output

Waveforms:

Normal

Mode

External

Trigger.

Page

3-2

Mode!

8012A

Section

!l

3—9

Manual

3—10

The

appropriate

circuits

and

controls

are

shown

in

figure

3-5.

Use

the

following

procedure

to

obtain

an

output

similar

to

that

shown

in

figure

3—6:

a.

Set

the

Mode

Selector

21

to

N.

b.

Set

the

PULSE

PERIOD

switch

1

to

either

EXT+

or

EXT-.

c.

Set

the

delay

between

the

trigger

and

output

pulse

as

described

in

para¬

graph

3-6.

d.

Set

the

width,

amplitude,

risetime,

falltime,

polarity

and

offset

of

the

output

pulse

as

described

in

para¬

graph

3-6.

e.

Press

the

MAN

button

5

once

for

each

output

pulse

required.

omttr

>3

vcnrutn

m

3—11

Square

Wave

3—12

The

appropriate

circuits

and

controls

are

shown

in

figure

3—7.

Use

the

following

procedure

to

obtain

an

output

similar

to

that

shown

in

figure

3—8.

a.

Set

the

Mode

Selector

21

to

N.

b.

Set

the

PULSE

PERIOD

switch

1

to

an

internal

range

as

described

in

paragraph

3-6

or

to

EXT

as

de¬

scribed

in

paragraph

3—8

and

apply

external

trigger

pulses

in

order

to

set

the

repetition

rate

of

the

output

pulses.

c.

Set

the

PULSE

WIDTH

switch

10

to

SQUARE

WAVE.

d.

Set

the

amplitude,

risetime,

falltime,

polarity

and

offset

of

the

output

pulses

as

described

in

paragraph

3—6.

WMF.

HH'Ofl

>

PVi$£

WIDTH

>0

Vf.fiH/tfi

7

ISQUAfit

WAVf.>

OFFSET

13

VtfiNtf*

Figure

3-5

Operation

Block

Diagram:

Normal

Mode

-

Manual.

Figure

3-7

Operation

Block

Diagram:

Normal

Mode

-

Square

Wave.

Output

when

MAN

button

6

pressed

once:

Trigger

output

pulse

(TRIGGER

OUTPUT

1?)

Positive

output

pulse

(OUTPUT

20)

Pulses

may

be

negative

and

the

baseline

offset

as

shown

in

figure

3-2.

A_A

Trigger

output

pulses

(TRIGGER

OUTPUT

17)

Positive

output

pulses

(OUTPUT

20)

Output

pulses

may

also

be

negative

end

Ihe

baseline

offset

as

shown

in

tigure

3-2.

Figure

3-6

Output

Waveforms:

Normal

Mode

-

Manual.

Figure

3-8

Output

Waveforms:

Normal

Mode

-

Square

Wave.

Page

3—3

Model

8012A

Section

III

Remember

the

following

points

about

the

square

wave

output:

Output

pulse

width

equals

half

the

selected

pulse

period,

Output

pulse

rate

is

one-half

that

of

the

rate

generator

(or

input

trigger

pulse).

The

delay

between

input

trigger

pulse

and

square

wave

output

is

fixed.

The

output

pulse

is

symmetrical

above

and

below

ground.

3—13

Gating

3—14

The

trigger

and

output

pulses

obtained

in

the

normal

mode

may

be

gated

by

applying

an

appropriate

gate

pulse

(see

specifications)

to

the

GATE

INPUT

socket

18;

the

operation

is

indicated

in

figure

3-9.

Figure

3-9

Output

Waveforms:

Normal

Mode

-

Gating.

3-15

RZ

MODE

3-16

External

pulses

(applied

to

the

INPUT

socket

22

on

the

rear

panel)

trigger

the

delay

generator

directly

(figure

3-10)

and

the

shape

of

the

output

pulses

is

determined

by

the

pulse

forming

circuits

following

the

delay

generator.

The

output

pulses

cannot

be

gated

and,

as

explained

in

paragraph

3—19,

are

independent

of

the

pulses

at

the

TRIGGER

OUTPUT

socket

17.

c.

Set

the

PULSE

WIDTH

switch

10

to

the

required

range,

then

adjust

the

VERNIER

11

for

the

exact

pulse

width.

d.

Set

the

amplitude,

risetime,

falltime,

polarity

and

offset

of

the

output

pulses

as

described

in

paragraph

3-6.

OFf$cr

>j

VMMW

U

Figure

3-10

Operation

Block

Diagram:

RZ

Mode.

f~«>.

■

*1.

i

>

7nS

Variable

Delay

*

Variable

1

<

36nS

to

IS.

Width

RZ

input

pubs

period

*

output

pulse

period.

RZ

input

pulses

(INPUT

22!

Positive

output

pulses

(OUTPUT

20).

Output

pulses

may

also

be

negative.The

baseline

may

be

offset.

Figure

3-11

Output

Waveform:

RZ

Mode.

3-17

EXTERNAL

WIDTH

MODE

The

following

procedure

should

be

used

to

obtain

outputs

similar

to

those

indicated

in

figure

3—11.

a.

Set

the

Mode

Selector

21

to

RZ.

b.

Set

the

delay

between

the

external

applied

pulses

and

the

resulting

out¬

put

pulses

by

selecting

the

range

required

on

the

PULSE

DELAY

switch

6

and

adjusting

the

VERNIER

7.

3-18

External

pulses

(applied

to

the

INPUT

connector

22

on

the

rear

panel)

trigger

the

transition

time

circuit

(figure

3-12).

The

output

thus

obtained

cannot

be

gated

and,

as

explained

in

paragraph

3-19,

is

independent

of

the

TRIGGER

OUTPUT

17.

The

following

procedure

should

be

used

to

obtain

outputs

similar

to

those

shown

in

figure

3—11.

a.

Set

the

Mode

Selector

21

to

EXT.

WIDTH.

Page

3—4