Topward 8112 Manuale utente

INSTRUCTION

MANUAL

DIGITAL

FUNCTION

GENERATOR

MODEL:

8112

if.

pwa

TABLE

CONTENTS

Picture

Model

8112

.....................................

Introduction..................................................

Before

Begin..........Q....................................

Front

Panel

the

Model

8112

.......................w.....

Front

Panel

Description.......................................

Operating

Instructions........................................

Operating

Cautions............................................1D

Theory

Operation...........................................11

Calibration...................................................1a

Troubleshooting...............................................16

Adjustﬁent

Location...........................................20

Block

Diagram.................................................21

Circuit

Diagram...............................................22

Component

Layout..............................................26

Specifications................................................2?

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part5

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PICTURE

MODEL

8112

x‘

INTRODUCTION

The

Topward

8112

portable,

bench

type

multi-purpose

digital

function

generator/counter

capable

producing

different

waveforms.

These

are

Sine,

Square,

Triangle,

Pulse

and

Ramp.

The

model

8112

features:

Adjustable

frequency

range

from

0.1

MHz

ranges,

variable

output

amplitude

from

Vp-p,

variable

symmetry/duty

cycle

from

95%

the

Ramp/Pulse

mode,

continuous

externally

controlled

outputs,

offset

between

—10

+10

can

added

all

output

waveforms,

inverted

and

attenuated

output,

built-in

100

MHz

frequency

counter

with

input

sensitivity.

2 _

FRONT

PANEL

the

MODEL

8112

Figure

—

FREQUENCY

RANGE

Hz/GATE

THME

ATT

TOOK

10K

100

EU__N_C

OdB..I.

‘

LIEII+IEI_

I+RLIIﬂ

[TIMI]

JET”

OVFL

GATE

KHz

QJOTS

108

COUNT.

~30dB

.-.

ﬂ.

PULL

VAR

AMPLITUDE

SYNC

VICF

COUNT.

OUTPUT

MAIN

FINE

RAMP/PULSE

OFFSET

POWER

OUT

PULL

INVERT

‘‘‘‘‘

.C‘P

Q“

Topward

DIGITAL

FUNCTION

GENERATOR

[NW

@®@@

FRONT

PANEL

DESCRIPTION

The

following

explanation

the

function

the

front

panel

controls

and

connectors.

Please

refer

Figure

for

location

each

control/connector.

POWER/AMPLITUDE

“

This

the

main

power

switch

and

the

amplitude

adjustment

knob.

Turning

the

control

clockwise

will

increase

the

amplitude.

FUNCTION

This

bank

switches

used

select

the

output

waveform.

Only

one

these

switches

can

depressed

time.

FREQUENCY

CONTROL

This

pair

knobs

used

adjust

the

output

frequency.

The

frequency

dependent

upon

the

setting

this

pair

knobs

and

the

RANGE/GATE

TIME

switches

(4).

Pulling

out

the

FINE

control

knob

(3)

will

invert

the

pulse

output.

RANGE/GATE

TIME

This

bank

switches

used

select

the

frequency

range

produced.

the

same

time,

the

counter

gate

time

changed.

RAMP/PULSE

This

knob

used

adjust

the

duty

cycle

the

Square

Triangle

waveforms.

when

the

knob

turned

CAL.

(fully

CCN

position),

the

duty

cycle

fixed

50%.

Otherwise,

the

duty

cycle

adjustable

between

95%.

FRONT

PANEL

DESCRIPTION

The

following

explanation

the

function

the

front

panel

controls

and

connectors.

lease

refer

Figure

for

location

each

control/connector.

POWER/AMPLITUDE

This

the

main

power

switch

and

the

amplitude

adjustment

knob.

Turning

the

control

clockwise

will

increase

the

amplitude.

FUNCTION

—

This

bank

switches

used

select

the

output

waveform.

Only

one

these

switches

can

depressed

time.

FREQUENCY

CONTROL

—

This

pair

knobs

used

adjust

the

output

frequency.

The

frequency

dependent

upon

the

setting

this

pair

knobs

and

the

RANGE/GATE

TIME

switches

(4).

Pulling

out the

FINE

control

knob

(3)

will

invert

the

pulse

output.

RANGE/GATE

TIME

This

bank

switches

used

select

the

frequency

range

produced.

the

same

time,

the

counter

gate

time

changed.

RAMP/PULSE

This

knob

used

adjust

the

duty

cycle

the

Square

Triangle

waveforms.

when

the

knob

turned

EAL.

(fully

new

position),

the

duty

cycle

fixed

50%.

Otherwise,

the

duty

cycle

adjustable

between

95$.

ATTENUATOR

—

when

this

push

button

out,

the

output/input

signal

unchanged.

the

switch

depressed,

the

Output/Input

signal

reduced

(Generator

output

Counter

input).

OFFSET

This

knob

allows

variable

voltage

between

~1O

+10

added

the

output

signal.

Note

that

the

knob

has

pulled

out

for

the

offset

affect

the

signal.

When

the

control

pushed

in,

offset

voltage

added.

OUTPUT

—

This

connector

provides

the

output

signal

for

all

waveforms.

FUNC/CDUNT

When

the

switch

out,

the

digits

DISPLAY

(11)

shows

the

generator

frequency.

When

the

switch

in,

the

DISPLAY

(11)

shows

the

input

frequency

counter.

10.

COUNTER

This

the

input

connector

for

the

1OOMH2

frequency

counter.

FUNC/COUNT

switch

(9)

must

depressed.

11.

FREQUENCY

DISPLAY

This

a 6

digits

LED

display

that

shows

the

output

frequency

the

main

generator

the

input

frequency

the

counter.

12.

INDICATORS

OVFL,

GATE,

KHz,

LEDs

enunciate

frequency

overflow,

gate

time

and

frequency

units

KHz,

Hz.

ATTENUATDR

—

When

this

push

button

out,

the

output/input

signal

unchanged.

the

switch

depressed,

the

Output/Input

signal

reduced

(Generator

output

Counter

input).

OFFSET

This

knob

allows

variable

voltage

between

~10

+10

added

the

output

signal.

Note

that

the

knob

has

pulled

out

for

the

offset

affect

the

signal.

When

the

control

pushed

in,

offset

voltage

added.

DUTPUT

This

connector

provides

the

output

signal

for

all

waveforms.

FUNC/CDUNT

—

When

the

switch

out,

the

digits

DISPLAY

(11)

shows

the

generator

frequency.

When

the

switch

in,

the

DISPLAY

(11)

shows

the

input

frequency

counter.

10.

COUNTER

This

the

input

connector

for

the

1DDNH2

frequency

counter.

FUNC/CDUNT

switch

(9)

must

depressed.

11.

FREQUENCY

DISPLAY

This

digits

LED

display

that

shows

the

output

frequency

the

main

generator

the

input

frequency

the

counter.

12.

INDICATORS

—

DVFL,

GATE,

KHz,

LEDs

enunciate

frequency

overflow,

gate

time

and

frequency

units

KHz,

Hz.

13.

VCF

This

input

used

modulate

the

main

frequency

1000:1

with

external

source

—

SVDC.

14.

SYNC

OUT

This

connector

supplies

TTL

compatible

output

signal

which

unaffected

either

the

FUNCTION

(2)

AMPLITUDE

(1)

controls.

The

output

frequency

the

same

that

OUTPUT

signal

(8).

13.

VCF

This

input

used

modulate

the

main

frequency

1ODD:1

with

external

source

—

SVDC.

14.

SYNC

OUT

This

connector

supplies

TTL

compatible

output

signal

which

unaffected

either

the

FUNCTION

(2)

AMPLITUDE

(1)

controls.

The

output

frequency

the

same

that

OUTPUT

signal

(8).

OPERATING

INSTRUCTIONS

Instrument

Turn-on

UARNING:

Before

applying

power

your

8112

make

sure

that

the

input

voltage

set

your

power

source.

Connect

the

8112

power

source

and

turn

the

POWER

switch

(1).

Main

Generator

Select

the

desired

waveform

using

the

FUNCTION

switch

(2).

generate

ramp

pulse

output,

turn

the

RAMP/PULSE

knob

(5)

and

set

the

desired

duty

cycle.

Set

the

desired

Frequency

with

the

FREQUENCY

control

(3)

and

the

RANGE

switches

(4).

Adjust

the

output

amplitude

with

the

AMPLITUDE

control

(1)

the

desired

level.

very

small

signal

required,

depress

the

ATTENUATDR

switch

(6).

Set

Offset

voltage

with

the

OFFSET

control

(7).

Use

the

SYNC

output

terminal

(14)

TTL

compatible

level

required.

OPERATING

INSTRUCTIONS

Instrument

Turn—on

WARNING:

Before

applying

power

your

8112

make

sure

that

the

input

voltage

set

your

power

source.

Connect

the

8112

power

source

and

turn

the

POWER

switch

(1)-

Main

Generator

Select

the

desired

waveform

using

the

FUNCTION

switch

(2).

generate

ramp

pulse

output,

turn

the

RAMP/PULSE

knob

(5)

and

set

the

desired

duty

cycle.

Set

the

desired

frequency

with

the

FREQUENCY

control

(3)

and

the

RANGE

switches

(4).

Adjust

the

output

amplitude

with

the

AMPLITUDE

control

(1)

the

desired

level.

very

small

signal

required,

depress

the

ATTENUATUR

Smitch

(B)

Set

Offset

voltage

with

the

OFFSET

control

(7).

Use

the

SYNC

output

terminal

(14)

TTL

compatible

level

required.

Pull

out

the

INVERT

switch

(3)

introduce

180

degree

phase

shift.

Voltage

Controlled

Frequency

Supply

trim

voltage

between

and

VDC

the

VCF

terminal

(13).

The

main

frequency

will

varied

over

1DUU:1.

Frequency

Counter

Push

the

FUND/COUNT

switch

(9).

Apply

input

signal

COUNT

(10).

Select

GATE

TIME

(4)

for

best

resolution.

Use

ATTANUATDR

(6)

for

large

input

signal

avoid

damage

instrument.

the

Pull

out

the

INVERT

switch

(3)

introduce

180

degree

phase

shift.

Voltage

Controlled

Frequency

Supply

trim

voltage

between

and

VDC

the

VCF

terminal

(13).

The

main

frequency

will

varied

over

1000:1.

Frequency

Counter

Push

the

FUND/COUNT

switch

(9).

Apply

input

signal

COUNT

(10).

Select

GATE

TIME

(4)

for

best

resolution.

Use

ATTANUATUR

(B)

for

large

input

signal

avoid

damage

the

instrument.

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