Wavetek 180 Manual de usuario

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1

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I

INSTRUCTION

MANUAL

MODELS

180

AND

180

LF

SWEEP/FUNCTION

GENERATORS

SWeEP-FUMCTiONGf^NLRATOR

180

St«F»:P«A!

E

on

OFFSET

FREQMULT^Hij

S^.EEPWIOTH

I

smi.c

PUISEOUT

iTTt

^

m

m

SWEEP/FUNCTION

GENERATOR

MODtc

jeotF

SWeiPRATE

DC

OFFSET

FRtQMUtT

iH*l

SWEEPWIDTH

\

f

Tj

\

r

/

WR<

AMPLtrUDE

PULSE

OUT

ITTL)

WVas/'

WARRANTY

All

Wavetek

instruments

are

warranteed

against

defects

in

material

and

workmanship

for

a

period

of

one

year

after

date

of

manufacture.

Wavetek

agrees

to

repair

or

replace

any

assembly

or

component

(except

batteries)

found

to

be

defective,

under

normal

use,

during

this

period.

Wavetek's

obligation

under

this

warranty

is

limited

solely

to

repairing

any

such

instrument

which

in

Wavetek's

sole

opinion

proves

to

be

defective

within

the

scope

of

the

warranty

when

returned

to

the

factory

or

to

an

authorized

service

center.

Transportation

to

the

factory

or

service

center

is

to

be

prepaid

by

purchaser.

Shipment

should

not

be

made

without

prior

authorization

by

Wavetek.

This

warranty

does

not

apply

to

any

products

repaired

or

altered

by

persons

not

authorized

by

Wavetek,

or

not

in

accordance

with

instructions

furnished

by

Wavetek.

If

the

instrument

is

defective

as

a

result

of

misuse,

improper

repair,

or

abnormal

conditions

or

operations,

repairs

will

be

billed

at

cost.

Wavetek

assumes

no

responsibility

for

its

product

being

used

in

a

hazardous

or

dangerous

manner

either

alone

or

in

conjunction

with

other

equipment.

High

voltage

used

in

some

instruments

may

be

dangerous

if

misused.

Special

disclaimers

apply

to

these

instruments.

Wavetek

assumes

no

liability

for

secondary

charges

or

consequential

damages

and,

in

any

event,

Wavetek's

liability

for

breach

of

warranty

under

any

contract

or

otherwise,

shall

not

exceed

the

purchase

price

of

the

specific

instrument

shipped

and

against

which

a

claim

is

made.

Any

recommendations

made

by

Wavetek

for

use

of

its

products

are

based

upon

tests

believed

to

be

reliable,

but

Wavetek

makes

no

warranty

of

the

results

to

be

obtained.

This

warranty

is

in

lieu

of

all

other

warranties,

expressed

or

implied,

and

no

representative

or

person

is

authorized

to

represent

or

assume

for

Wavetek

any

liability

in

connection

with

the

sale

of

our

products

other

than

set

forth

herein.

INSTRUCTION

MANUAL

MODELS

180

AND

180

LF

SWEEP/FUNCTION

GENERATORS

\\^\VETEK

Box

651,

San

Diego,

Calif.,

714-279-2200

3/77

CONTENTS

SECTION

1

GENERAL

DESCRIPTION

1.1

THE

MODELS

180

AND

180LF

1.2

SPECIFICATIONS

SECTION

2

INITIAL

PREPARATION

2.1

UNPACKING

INSPECTION

2.2

PREPARATION

FOR

USE

2.3

ELECTRICAL

ACCEPTANCE

CHECK

2.4

CHANGING

THE

OUTPUT

IMPEDANCE

.

..

.

SECTION

3

OPERATION

3.1

CONTROLS

AND

CONNECTORS

.

3.1.1

Power/Frequency

Controls

3.1.2

Amplitude

Controls

3.1.3

Function

Selections

3.1.4

Sweep

Controls

3.2

OPERATION

3.2.1

Signal

Termination

3.2.2

Manually

Controlled

Operation

3.2.3

Voltage

Controlled

Operation

3.2.4

Sweep

Generator

Operation

SECTION

4

CIRCUIT

DESCRIPTION

4.1

VOLTAGE

CONTROLLED

GENERATOR

(VCG)

4.2

FREQUENCY

CONTROL

4.3

WAVEFORM

OUTPUT

4.4

SWEEP

CIRCUITS

4.5

CRYSTAL

CONTROL

SECTION

5

CALIBRATION

5.1

FACTORY

REPAIR

5.2

REQUIRED

TEST

EQUIPMENT

5.3

REMOVING

GENERATOR

COVER

5.4

CALIBRATION

SECTION

6

TROUBLESHOOTING

6.1

FACTORY

REPAIR

6.2

TROUBLESHOOTING

CHART

6.3

TROUBLESHOOTING

INDIVIDUAL

COMPONENTS

SECTION?

PARTS

AND

SCHEMATICS

7.1

DRAWINGS

7.2

ORDERING

PARTS

7.3

ADDENDA

1-1

1-1

2-1

2-1

2-1

2-1

3-1

3-1

3-1

3-2

3-2

3-2

3-2

3-3

3-3

3-4

4-1

4-1

4-2

4-2

4-2

5-1

5-1

5-1

5-1

6-1

6-1

6-1

7-1

7-1

7-1

1

SECTION

GENERAL

DESCRiPTION

1.1

THE

MODELS

180

AND

180LF

The

Wavetek

Model

180

Sweep/Function

Generator

is

a

precision

source

of

sine,

triangle,

and

square

waveforms.

Frequency

of

the

waveforms

is

manually

and

remotely

variable

from

0.1

Hz

to

2

MHz.

The

generator

can

repeti

tively

sweep

from

one

frequency

to

a

higher

frequency,

with

controllable

rate

and

range

of

sweep.

Amplitude

of

the

waveforms

is

variable

from

10V

peak-to-peak

into

50f2

down

to

30

mV

p-p.

DC

reference

of

the

waveforms

can

be

offset

positively

and

negatively.

A

voltage

representing

generator

frequency,

a

fixed

amplitude

pulse

train

of

that

frequency,

and

a

voltage

ramp

representing

frequency

sweep

rate

are

provided

as

front

panel

outputs.

The

Wavetek

Model

180LF

(Low

Frequency)

Sweep/Func

tion

Generator

is

identical

to

the

Model

180

except

for

frequency

range:

0.01

Hz

to

200

kHz.

1.2

SPECIFICATIONS

The

specifications

(available

waveforms,

frequencies,

and

amplitudes),

operating

modes,

precision

(accuracy),

and

purity

(quality)

are

listed

in

the

following

paragraphs.

1.2.1

Versatility

Output

Signals

Sine

%

,

triangle

ramp

^

and

DC.

square

""Lj

,

TTL

pulse

J~L

Control

Generator

operates

in

continuous

and

sweep

modes.

Fre

quency

controlled

manually

or

with

external

voltage.

Frequency

Range

0.1

Hz

to

2

MHz

(180);

0.01

Hz

to

200

kHz

(180LF).

Operating

Frequency

Ranges

Model

180:

XI

0.1

Hz

to

2

Hz

X

10

0.1

Hz

to

20

Hz

X100

0.2

Hz

to

200

Hz

X

IK

2

Hz

to

2

kHz

XIOK

20

Hz

to

20

kHz

X

100K

200

Hz

to

200

kHz

X

1M

2

kHz

to

2

MHz

Model

180LF:

X.I

0.01

Hz

to

0.2

Hz

X

I

0.01

Hz

to

2

Hz

X

10

0.02

Hz

to

20

Hz

X100

0.2

Hz

to

200

Hz

X

IK

2

Hz

to

2

kHz

X10K

20

Hz

to

20

kHz

X

100K

200

Hz

to

200

kHz

Main

Output

Sine,

triangle

and

square

waveforms

and

DC

are

selectable.

HI

(0

dB)

and

LO

(-20

dS)

BNC

outputs

are

available

for

simultaneous

usage;

outputs

may

be

varied

to

HI

(—30dB)

and

LO

(—50

dB)

by

amplitude

control.

HI

output

provides

20V

peak-to-peak

max

open

circuit

(10V

peak-to-peak

max

into

50n

load).

LO

output

provides

IV

peak-to-peak

max

into

50n

load.

Both

output

impedances

are

50^2.

DC

Offset

and

DC

Output

DC

offset

of

waveform

and

DC

output

selectable

and

variable

through

HI

and

LO

BNC

outputs.

HI

output

±10V

max

(±5V

into

50n

load)

as

offset

or

Vdc

output.

LO

output

±1V

max

into

50n

load

as

offset

or

Vdc

output.

Waveform

offset

limited

to

±10

Vp

HI

and

±1

Vp

LO

(both

open

circuit

voltages).

Pulse

Output

TTL

pulse

(50%

duty

cycle)

at

generator

frequency.

Drives

up

to

20

TTL

loads.

GCV

Output

0

to

+2V

(nominal,

open

circuit)

proportional

to

frequency

of

main

generator.

Output

impedance

600J2.

VCG

—

Voltage

Controlled

Generator

Input

VCG

voltage

as

well

as

control

settings

select

generator

frequency.

Frequency

may

be

dc-programmed

or

ac-mod-

ulated

by

external

0

to

2V

signal.

Input

impedance

is

2

kS7.

VCG

input

can

change

generator

output

1000:1

on

all

ranges

except

X

10

Hz

and

X

1

Hz

ranges

(Model

180)

and

X

1

Hz

and

X

.1

Hz

(Model

180LF).

VCG

Input

Signal

Bandwidth;

100

kHz.

VCG

Slew

Rate:

O.IVZ/JS.

1-1

Sweep

Output

Ramp

waveform

output

with

5V

peak

into

open

circuit.

Output

impedance

600n.

1.2.2

Operating

Modes

Continuous

Operates

as

standard

VCG.

Frequency

of

main

generator

determined

by

dial/range

setting

and

VCG

input

voltage.

Sweep

Main

generator

is

frequency

modulated

by

internal

sweep

generator.

When

swept,

main

generator

frequency

rises

from

frequency

set

by

the

dial

and

range

setting

to

a

frequency

set

by

sweep

width

control.

Sweep

Rate:

30

ms

to

20s

(nominal)

continuously

adjustable

by

single

turn

control

on

front

panel.

Sweep

Width:

Up

to

1:1000

adjustable

on

all

ranges

except

X

1

Hz

and

X

10

Hz

ranges

(Model

180)

and

X

.1

Hz

and

X

1

Hz

(Model

180LF).

1.2.3 Horizontal

Precision

Dial

Accuracy

Model

180:

±3%

of

full

scale

for

0.1

Hz

to

2

MHz.

Model

180LF:

±3%

of

full

scale

for

0.01

Hz

to

200

kHz.

Time

Symmetry

Models

180

and

180LF,

as

applicable:

±1%

on

all

but

X

1M

range.

1.2.4

Vertical

Precision

Amplitude

Change

With

Frequency

(Sine)

Models

180

and

180LF,

as

applicable:

Less

than

±0.1

dB

on

all

ranges

thru

X

100K.

Less

than

±0.5

dB

on

X

1M

range.

1.2.5

Waveform

Purity

(Models

180

and

180LF,

as

applicable)

Sine

Distortion

Less

than

0.5%

on

X

100,

X

1K,

X

10K

ranges

(typically

0.2%).

Less

than

1.0%

on

X

1,

X

10,

X

TOOK

ranges

(typically

0.5%).

All

harmonics

30

dB

down

on

X

1M

range.

Square

Wave

Rise

and

Fall

Time

Less

than

75

nanoseconds.

Triangle

Linearity

Greater

than

99%

to

200

kHz.

1.2.6

Environmental

Specifications

apply

at

25°C

±5°C.

Instrument

will

operate

from

0°C

to

+50°C.

1.2.7

Mechanical

Dimensions

11%

in./28.6

cm

wide;

4

in./10.2

cm

high;

lOVa

in./26.7

cm

deep.

Weight

6.5

lb/2.9

kg

net;

9.5

lb/4.3

kg

shipping.

1.2.8

Power

105

to

125V

or

200

to

250V,

50

Hz

to

400

Hz.

Less

than

15

watts.

NOTE

AH

specifications

apply

when

frequency

dial

is

between

0.1

and

2.0,

amplitude

is

at

10V

p-p

and

output

is

from

HI

BNC

into

500.

load.

1-2

2

SECTION

INITIAL

PREPARATION

2.1

UNPACKING

INSPECTION

After

carefully

unpacking

the

instrument,

inspect

the

ex

ternal

parts

for

damage

to

knobs,

dials,

indicators,

surface

areas,

etc.

If

there

is

damage,

file

a

claim

with

the

carrier

who

transported

the

instrument.

Retain

the

shipping

con

tainer

and

packing

material

for

use

in

case

reshipment

is

required.

2.2

PREPARATION

FOR

USE

Before

connecting

the

instrument

to

line

power,

check

that

the

rear

panel

115/230V

switch

is

set

to

the

value

nearest

the

line

voltage

and

that

the

fuse

is

correct

for

the

switch

setting.

Check

that

the

plug

on

the

power

cord

is

the

mate

for

the

line

receptacle.

2.3

ELECTRICAL

ACCEPTANCE

CHECK

This

checkout

procedure

provides

a

general

verification

of

generator

operation.

Should

a

malfunction

be

found,

refer

to

the

Warranty

in

the

front

of

this

manual.

An

oscilloscope,

BOH

coax

cable,

and

a

50f2

feedthru

are

needed

for

this

procedure

(figure

2-1).

Preset

the

generator

front

panel

controls

as

follows:

Control

Position

FREQMULT

PWR

OFF

Frequency

Dial

l.Q

Function

AMPLITUDE

Full

clockwise

DC

OFFSET

OFF

SWEEPWIDTH

OFF

SWEEP

RATE

9

o'clock

Perform

the

steps

in

table

2-1;

monitor

the

50n

OUT

HI

connector

at

the

oscilloscope.

2.4

CHANGING

THE

OUTPUT

IMPEDANCE

The

output

impedance

is

normally:

HI

50n@10Vp-p

LO

50J2

@

1V

p-p

Attenuation

is

normally

0

-

30

dS.

Lowest

possible

ampli

tude

is

—50

dB.

If

simultaneous

BOOH

and

50n

output

impedances

are

desired:

MODEL

180

50L2„

LOAD

OUT®

Clh

OSCILLOSCOPE

Figure

2-1.

Acceptance

Check

Setup

1.

Change

value

of

R145

from

49912

to

604S2.

2.

Remove

R147.

The

result

is:

HI

5012

@

10V

p-p

LO

60012

@

10V

p-p

(low

power)

Attenuation

is

0

-

30

dB.

Lowest

possible

amplitude

is

—30

dB.

Square

wave

rise

and

fall

is

<

150

ns.

If

5012

and

any

other

impedance

greater

than

60012

are

desired,

replace

R145

with

resistor

of

that

value.

If

50

dB

of

attenuation

control

is

desired

in

a

modified

instrument,

change

R121

from

33.212

to

1.812.

Waveform

quality

above

20

kHz

will

be

considerably

impaired

at

-50

dB

compared

to

a

standard

instrument.

2-1

Table

2-1.

Acceptance

Check

Step

Control

Position/Operation

Observe

at

50SJ

OUT

1

FREQMULT

X

1

(Model

180)

X

.1

(Model

180LF)

1

Hz,

10V

p-p

sine

wave

(Model

180)

0.1

Hz,

10V

p-p

sine

wave

(Model

180LF)

2

FREQ

MULT

X

1,

X

10,

X

100,

- - -

X

1M

(as

applicable)

Frequency

increases

by

a

decade

for

every

change

of

switch

position

3

FREQ

MULT

X

IK

4

Function

Triangle

wave

5

Function

"b

Square

wave

6

AMPLITUDE

ccw

Decrease

in

waveform

amplitude

7

DC

OFFSET

cw

Positive

slew

of

waveform

from

full

negative

offset

8

DC

OFFSET

ccw

Negative

slew

of

waveform

g

DC

OFFSET

OFF

10

AMPLITUDE

Full

cw

11

Dial

Full

cw

12

SWEEP

WIDTH

Full

cw

Frequency

of

waveform

repetitively

sweeps

2-2

3

SECTION

OPERATiON

3.1

CONTROLS

AND

CONNECTORS

The

generator

front

panel

controls

and

connections

shown

in

figure

3-1

are

keyed

by

circled

numbers

to

the

following

descriptions.

3.1.1

Power/Frequency

Controls

(T)

FREQMULT/PWR

OFF

Power

is

turned

on

when

frequency

range

is

selected

at

the

FREQ

MULT

(Hz)

control.

The

ranges

multiplied

by

frequency

dial

settings

deter

mine

output

frequency.

The

frequency

dial

index

lights

when

power

is

turned

on.

(2)

Frequency

Dial

Frequency

dial

settings

multiplied

by

frequency

range

determine

output

frequency.

VCG

IN

Connector

Voltage

controlled

generator

input

(VCG

IN)

dc

excursions

proportionally

control

frequency

within

a

selected

range.

Positive

inputs

increase

frequencies

set

by

the

frequency

dial

and

range

control;

nega

tive

inputs

decrease

the

frequencies.

GCV

OUT

Connector

Generator

controlled

voltage

output

(GCV

OUT)

dc

excursions

of

OV

to

about

2V

proportionally

represent

output

frequency

within

a

given

range.

3.1.2

Amplitude

Controls

@

DC

OFFSET

Rotating

the

DC

OFFSET

control

clockwise

offsets

dc

center

reference

of

waveform

positive;

when

POWER/FREQUENCY

FREQ

UlTiH/t

SWEEP

WiOTH

SWEEP

AMPLITUDE

©

@

®

SWEEP/FUNCTION

a'VEEPRATE

DC

Of

\

^

iiv

F

\

/

OFF

\GCV

jTSiNeBP

PULSE

OUT

OUT

/

OUT

(TTLI

I

ENERATt

DEL

180

FUNCTIONS

Figure

3-1.

Model

180

Controls

and

Connectors

3-1

counterclockwise,

negative.

When

OFF,

the

wave

form

is

balanced

around

signal

ground

(figure

3-2).

TTL

PULSE

Figure

3-2.

Output

Waveforms

@

AMPLITUDE

Rotating

the

AMPLITUDE

control

fully

clockwise

provides

maximum

peak-to-peak

output

at

the

50n

OUT

connectors;

counterclockwise

for

up

to

30

dB

attenuation

of

output

amplitude.

50n

OUT

Connectors

Maximum

output

of

10V

p-p

signals

into

a

5012

load

(20V

p-p

open

circuit)

is

provided

at

the

50n

OUT

HI

connector,

and

20

dB

below

(1/10

or

a

1V

p-p

maximum)

of

that

level

at

the

5012

OUT

LO

connector.

3.1.3

Function

Selections

(D

%

Tj

,

and

DC

(Waveforms)

Sine

'V

,

triangle

'V

,

and

square

""L

wave

forms

are

selected

by

the

larger

of

the

two

concen

tric

controls;

the

DC

position

provides

a

dc

voltage

output

of

the

waveform

center

reference

level

at

the

5012

OUT

connectors.

@

TTL

PULSE

OUT

Connector

A

fixed

amplitude

Transistor-Transistor

Logic

(TTL)

square

pulse

train

of

the

output

frequency

is

provided

at

the

PULSE

OUT

(TTL)

connector.

(TTL

levels

are

OV

to

0.4V

for

a

logic

low

and

2.4V

to

5V

for

a

logic

high.)

The

output

can

drive

up

to

20

TTL

loads.

The

pulse

train

can

also

be

used

as

a

synchronizing

reference

for

the

main

output

@

.

Phase

of

the

waveforms

relative

to

the

TTL

pulse

is

shown

in

figure

3-2.

3.1.4

Sweep

Controls

@

SWEEP

WIDTH/OFF

Main

output

(at

5012

OUT

HI

or

LO)

frequency

sweep

is

turned

on

when

SWEEP

WIDTH

is

rotated

past

OFF.

Rotation

of

the

control

varies

the

peak

amplitude

of

an

internal

ramp

signal

(seen

at

GCV

OUT)

whose

voltage

controls

the

frequency

of

the

main

generator

(seen

at

5012

OUT).

See

figure

3-3.

.

SWEEP

TIME

GCV

OUT

5012

OUT

SWEEP

START

FREQUENCY

SET

BY

FREQUENCY

DIAL

SWEEP

WIDTH

SWEEP

STOP

FREQUENCY

SET

BY

SWEEP

WIDTH

Figure

3-3.

Effect

of

Sweep

on

Output

Frequency

SWEEP

OUT

Connector

The

sweep

generator

ramp

is

available

at

the

SWEEP

OUT

connector.

Amplitude

is

OV

to

5V

peak

(60012

source

impedance).

SWEEP

RATE

Rotation

of

SWEEP

RATE

controls

duration

of

the

sweep

voltage

ramp,

and

thus

frequency

of

sweep

repetition.

3.2

OPERATION

Operation

can

be

quite

varied

but

is

described

here

as

manual,

voltage

controlled

or

sweep

controlled.

The

gen

erator

is

ready

to

operate

as

soon

as

a

frequency

multiplier

is

selected;

however,

when

output

is

critical,

allow

Vi

hour

warm

up.

3.2.1

Signal

Termination

Proper

signal

termination,

or

loading,

of

the

generator

con

nectors

is

necessary

for

its

specified

operation.

For

example,

the

proper

termination

of

the

main

output

is

shown

in

figure

3-4.

Placing

the

50

ohm

terminator,

or

50

ohm

resistance,

in

parallel

with

a

higher

impedance,

matches

the

receiving

instrument

input

impedance

to

the

generator

3-2