Tektronix FG501 Manual de usuario

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........

070-1431-01

Te

k

tro

nb

c

CO

M

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ITT

E

D

TO

E

XC

E

LLE

N

C

E

FUNCTION

GENERATOR

1

INSTRUCTION

M

ANUAL

Te

k

tro

n

i

x

,

Inc

.

Ρ

.

Ο

.

Box

500

B

eaverto

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,

Orego

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97077



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u

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irst

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ri

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A

ug

u

st

Ι

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nearest

Tektron

timber

r

is

warranted

against

detecfit

"c

meAc'

-

iw

.i

and

rmal

use,

for a

nix

will

repair

or replace,

at

its

op

termined

to

be

defecUve

within

the

wana

ix

Servicx?

!^

ι

;υ

,

vvorkt

iniflal

shipment,

produccis

de

avd

rv-

?

urnpd,

freight

prepaid

.,

to

fitness

wof

I

01i

Y



V%



k1i

Please

direct

all

requests

for

service

or

replacement

parts

to

the

nter or Field

Office,

include

the

type

or

product

and

its

serial

number

.

Copyright

-)

197

2

,

1978 by

Tektronix

.

reserved

.

Contents

of this

publication

may

not

be

duced

in

any

form

without

the

permissio

ektronix,

I

Products

of

Tektronix,

inc

.

and

its

subsidiaries

ar

;

a

covered

by

U

.S

.

and

foreign

patents

and/or

pending

patents

.

TEKTRONIX,

TEK,

SCOPE-MOBILE,

TELEQWPMENT,

and



are

registered

trademarks

of

Tektronix,

Inc

.

Printed

in

U

.S

.A

.

Specification

and

price

change

privNeges

are

reserved

.

TABLE

Ο

F

CO

N

T

EN

TS

S

E

CTIO

N

1

S

E

CTIO

N 2

W

A

RN

ING

,

THE

FO

LL

O

W

I

NG S

ERV

ICI

N

G

I

N

ST

RU

CTIO

N

S

AR

EF

OR

U

SE

BY

Q

U

A

L

I

F

I

E

D

PER-

SO

NNEL

O

NL

Y

.

T

O

AV

OID

PER

SO

N

A

L

I

NJUR

Y,

DO

NOT

PERFO

RM

ANY

S

ERV

ICI

N

G

OT

HER

THAN THAT

CO

N

TAI

NE

D

IN

OPER

ATI

NG

I

N

ST

RU

CTIO

N

S

UNLE

SS

YO

U

A

RE

QUA

L

I

F

I

ED

TO

DO

SO

.

C

HA

N

G

E

I

NF

O

RM

ATIO

N

SE

CTIO

N

3

AD

JUST

MEN

T

3-1

SE

CTIO

N

4

M

AI

NT

EN

A

N

C

E

AND

I

NT

ERF

ACI

NG

I

NF

O

RM

ATION

4-1

SE

CTIO

N

5

CI

R

CU

IT

D

E

SC

R

I

P

TIO

N

5-1

SE

CTIO

N

6

O

P

TIO

N

S

6-1

SE

CTIO

N

7

REPL

AC

E

A

BLE ELE

CT

R

ICA

L P

A

R

TS

7-1

S

E

CTIO

N 8

DIAG

RA

M

A

ND

CI

R

CU

IT

B

OA

RD

I

LLU

ST

R

ATIO

N

8-1

SE

CTIO

N9

REPL

AC

E

A

BLE

ME

CHAN

ICA

L P

A

R

TS

A

N

D

E

X

PL

OD

E

D

V

IE

W

9-1

,.

P

age

O

PER

ATI

N

G

I

N

ST

RU

CTIO

N

S

1-1

S

PE

CI

F

ICATIO

N

AND

PERF

O

RM

ANC

E

C

HE

C

K

2-1

Fig

.

1-1

.

FG

501 Function

Generator

I

N

T

R

OD

U

CTIO

N

Th

e F

G

501 Function

Generator

is

designed

to

op

erate

i

nα

TM

500-Series

p

ower

mo

d

ule

.

L

ow

d

istortion

si

n

e,

s

q

uare,

triangle,

pulse,

an

d

ramp

waveformsfrom

0

.001

Hz

to

1

MH

z as

well

as

α

+2,5

volt

sq

uare-wave

trigger

are

available

at

t

he

front

p

an

el

.

V

ariable

DC

offset

of

±7

.5

volts

is

also

p

rovide

d

.

Α

"h

ol

d

"

feature

allows

t

he

ge

n

erator

outp

ut to

be

abru

p

tly

h

alted

at

its

instantaneous

voltage

level

an

d

h

el

d

t

here un

til

ma

n

ually

switc

h

ed on

again

.

Α

voltage-controlle

d

fre

q

uency

(V

C

F) in

p

ut is

provi

d

ed

to

control

t

h

e

out

p

ut

fre

quency

from

an

exter

n

al

voltage

source

.

T

he outp

ut

fre

quency

can

be

swe

p

t

above

or

below

t

h

e

selecte

d

fre

q

ue

ncy

to

α

maxim

u

m

of

1000

:1

de

pe

nd

ing

on

t

he

polarity

and

am

p

litu

d

e

of

t

he

V

C

F

i

n

put

an

d

t

h

e

selecte

d

output

frequency

.

Also

inclu

d

ed

is

an

exter

n

al

gate

in

p

ut

t

h

at

allows

t

he

generator

to

be

tur

n

ed on

for

t

h

e

d

uration

of

an

externally

ap

p

lie

d

gating

signal

.

T

h

is

mo

d

e

p

rovi

des

eit

h

er

α

single

cycle

outp

ut

or

α

train

(burst)

of

p

reselected

waveforms

dependi

n

g

on

t

he

gating

sig

n

al

width an

d

t

he

ge

n

erator

fre

q

uency

setti

n

g

.

T

he

p

h

ase

(start level)

of

t

he

waveform

burst

can be

varie

d

±90°

b

yα

fro

n

t-

p

an

el

con

trol

.

T

he

variety

of

swe

p

t

a

n

d

mo

d

ulate

d

signals

available

from

t

he

F

G

501

ma

ke

it

es

p

ecially

usef

u

l

for

suc

h

ap

p

lications

as

testing

servo-system

or

amplifier

res

p

onse,

distortio

n

,

and

stability

;

FM

ge

n

eratio

n

an

d

fre

q

uency

multiplicatio

n

;

or

sim

p

ly

u

sed

as

α

variable

beat-fre

q

ue

ncy

oscillator,

re

p

etitio

n

-rate,

o

r

tone-burst

ge

n

erator

.

T

h

e

sq

uare-wave

trigger

outp

ut

ca

n

be

use

d

as

α

source

for

tra

n

sistor-tra

n

sistor

logic

(TT

L

)

or

to

syn-

ch

ro

n

ize

an

exter

n

al

device such as

an

oscilloscope

or

counter

.

T

h

e

F

G

501

is

calibrated

a

nd

ready

for

use

w

h

en

received

.

It

is

design

ed

to

op

erate

in

any

compartment

of

α

TM

500-Series

power

module

only

.

R

efer to

t

he

p

ower

mo

d

ule

I

n

st

r

uctio

n

Manual

for

line

voltage

re

q

ui

r

eme

n

ts

a

nd

power

mo

d

ule

operatio

n

.

REV

.

C

JUL

197

8

OPERATING

I

N

ST

RU

CTIO

N

S

Installation

an

dR

emoval

Sectio

n

1-

F

G

501

Turn

t

he

p

ower

mo

d

ule

off

before

inserting

t

h

e

plug-

in

;

otherwise,

d

amage

may

occu

r

to

t

h

e

plug-in

c

ί

rcuitry

.

B

ecause

of

t

h

ehigh cu

r

rent

drawn

by

t

he

FG

501,

it

is

also

r

ecommen

d

e

d

th

at

t

he

p

owe

r

mo

d

ule

be turned

off

before

removing

t

h

e

FG

501

.

R

efer

to

Fig

.

1-2

.

C

h

ec

k

to

see

th

at

t

he

plastic

barriers

on

t

h

e

interconnecting

jac

k

of

t

h

e

selecte

d

p

ower

module

compa

r

tment

matc

h

th

e

cut-outs

in

t

he

F

G

501

circuit

board

edge

connector

.

Align

t

h

e F

G

501

ch

assis

wit

h

t

he

upper

a

nd

lower

guides

of

t

h

e

selected

com

p

artme

n

t

.

P

ush

t

h

e

mo

d

ule

in

a

nd

p

ress firmly

to

seat

t

he

circuit

board

in

t

he

inter-

connecting

j

ac

k

.

Pull

t

he

P

ower

switc

h

on

t

h

e

fro

n

t

p

anel

of

t

he

p

ower

module

to

apply

p

ower

to

t

h

e F

G

501

.

Observe

t

h

at

t

h

e

P

O

WER

indicator

lig

h

t

on

t

he F

G

501

comes

on

.

R

emove

t

he F

G

501

from

t

he

power

mo

d

ule

by p

ulli

ng

t

he

release

latc

h

at

t

he

bottom

of

t

he

fro

n

t

pa

n

el

a

nd

sliding

t

he

unit

straig

h

t

out

of

t

he p

ower

module

.

F

ig

.

1-2

.

P

l

u

g-i

n

i

n

stallatio

na

nd

r

emoval

.

O

p

e

r

ating

I

n

st

ru

ctions-

F

G

501

O

PER

ATI

N

G

CON

SID

ER

ATIO

N

S

ΝΟΤΕ

Befo

r

e

using

t

h

e

FG

501

fo

r

t

h

e

first

time,

r

ead

t

he

Operati

n

g

Co

n

siderations

in

t

h

is

section

an

d

t

he

d

esc

r

i

p

tion

of

t

he

f

r

ont-panel

controls,

connectors,

and

indicators

i

n

F

ig

.

1-3

.

Out

p

ut

Con

n

ections

T

he

output

of

t

he

F

G

501

is

designed

to

operate

as α

voltage

source

in

series

wit

h

50

Ω

and

wor

k

i

ng

i

n

to

α50

Ω

load

.

At

t

h

e

h

ig

h

er

f

r

e

qu

encies,

an un

te

r

mi n

ated

or

im

p

roperly

termi

n

ated

output

will

ca

u

se

excessive

a

b

erratio

n

s

on

t

he outp

ut

waveform

(see

Impe

d

ance

M

atc

hing

disc

u

ssion)

.

L

oa

d

s

less

than 50

Ω

will

re

d

ucet

he

waveform

am

p

litude

.

E

xcessive

distortion or

a

b

errations

due

to

imp

r

op

er

terminatio

n

is

less

li

k

ely

to

occur

at

t

he

lower

fre

q

ue

n

cies

(especially

wit

h

sine

an

d

tria

n

gle

waveforms)

.

H

oweve

r

,

to

en

sure

t

h

at

waveform pu

r

ity

is

preserve

d

,

observe

t

he

following precautio

ns

:

1

.

U

se q

uality

50

Ω

coaxial

cables and

con

n

ectors

.

2

.



M

a

k

e

all

con

n

ectio

n

s

tig

h

t

a

nd as s

h

ort

as

p

ossible

.

3

.

Use q

uality

atte

nu

ators,

if

necessa

r

y,

to

red

u

ce

waveform

am

p

litude

to

sensitive

ci

r

cuits

.

4

.

U

se

termi

n

ators

or

im

p

edance-matc

h

i

n

g

devices

to

avoid

reflectio

n

s

w

h

e

n

usi

ng long ca

b

les,

i

.e

.,

six

feet or

more

.

5

.

E

nsure

t

h

at

atte

n

uators,

termi

n

ations,

etc

.

h

ave

ad

e

qu

ate

power-

h

andli

ng capa

b

ilities

for

t

he output

waveform

(a

pp

roximately

0

.5

W

into

α

50

Ω

load)

.

P

ower

o

u

tput

is

determine

d

by

t

he

selecte

d

waveform,

its

am

p

litude,

a

nd

t

h

e

amou

n

t

of

offset

voltage

selected

.

T

he p h

ysical

a

nd

electrical

ch

aracteristics

of

t

he pu

lse-

tra

n

smitti

n

g

cable d

etermi

ne

t

h

e ch

aracteristic

im-

pedance,

velocity of

prop

agatio

n

,

and

amou

n

t

of

sig

n

al

loss

.

Signal

loss,

d

ue

to

en

ergy

d

issipatio

n

i

nth

e

ca

b

le

dielectric,

is

p

ro

p

o

r

tio

n

al

to

t

h

e

fre

q

ue

n

cy

;

t

h

erefore,

α

few

feet

of

ca

b

le

can

atte

n

uate

h

ig

h

-freque

ncy

i

n

forma-

tio

n

in

α

fEkst-rise

p

ulse

.

It

is

importantto

k

eept

h

ese

cables

as sh

ort

as

possible

.

Wh

en

signal

com

p

arison

measurements

or time

difference

determinatio

ns

are

made,

t

h

e

two

signals

from

t

he

test

device

s

h

o

u

ld

travel

t

h

roug

h

coaxial

cables

wit

h

identical

loss

and

time-d

elay

c

h

aracteristics

.

If

t

here

is

α

d

o

voltageacross

t

h

eoutput

load,

t

h

e

output

p

ulse

am

p

litu

d

e

will

be

compressed

;

or

in

some

cases,

if

t

he

voltage

excee

d

s

±10

V,

it

may

sh

ort

t

heoutput

.

To

preven

t t

h

is

from

occurring,

t

h

e

output

must

b

e

coupled

t

h

roug

hα

do

b

loc

king cap

acitor to

t

h

e

loa

d

.

The

time

con

sta

n

t

of

t

he

cou

p

li

n

g

ca

p

acitor

an

d

loa

d

must be

lo

n

g

eno

ug h

to

maintai

n

p

ulse

flat

ness

.

R

isetime

and

Falltime

If

t

h

e

out

p

ut

pulse

from

t

h

e

F

G

501

is

use

d

for

measuri

ng

t

he

r

ise

or

falltime

of

α

d

evice,

t

h

e

risetime

ch

aracteristics

of

associate

d

eq

ui

p

me

n

t

may

h

ave

to

be

considered

.

If

t

he

risetime

of

t

he device un

der

test

is

at

least

10 times

greater

t

han

t

he

combine

d

risetimes

of

t

he

F

G

501

plus

t

he monitoring

oscilloscope

a

nd

associate

d

cables,

t

h

e

error

i

n

troduced

will

n

ot

exceed

1

ο/ο

an

d

generally

can

be ignored

.

If

t

he

rise

or

falltime

of

t

he

test

device,

h

owever,

is

less

t

han 10 times as long as

t

he

combi

ned

risetimes

of

t

h

e

testi

ng

system,

t

h

e

actual

risetime

of

t

he device

will

h

ave

to

b

e

d

eterminedfrom

t

h

e

risetime

of

eac

h compone

n

t

ma

k

i

ng up

t

h

e

system

.

T

h

is

equals

t

he s

q

uare

root

of

t

he

sum

of

t

he sq

uares

of

t

h

e

i

n

divi

d

ual

risetimes

.

Co

n

versely,t

herisetimeoft

h

edevice

under

test

can

be

found

from

t

h

e

same

relations

h

ip

if

all

t

he

actual risetimes

in

t

h

e

system

are

kn

own

except

t

h

at

of

t

he device

under

test

.

Im

p

edance

M

atc

h

i

ng

R

eflectio

n

s

.

As

α

pu

lse

travels

d

own

α

tra

nsmission

line,

eac

h

time

it

encou

n

ters

α

mismatc

h

,

or

an im p

eda

n

ce

differe

n

t t

han

t

he transmission

li

n

e,

α

r

eflection

is

generate

da

nd

sent

backalon

g

t

he

line

to

t

he

source

.

T

he

amplitude

and

p

olarity

of

t

he

reflectio

ns are

d

etermi

n

ed

b

y

t

he

amount

of

t

h

e

encountere

d

impedance

i

n

relatio

n

to

t

he ch

aracteristic

im

p

edance

of

t

he ca

b

le

.

If

t

he

mismatc

h im

p

edance

is

h

ig

h

er

t

han

t

h

e

line,

t

h

e

reflectio

n

will

be

of

t

h

e

same

p

olarity

as

t

h

e

applied

sig

n

al

;

if

it

is

lower,

t

h

e

reflection

will

b

e

of

o

p

posite

p

ola

r

ity

.

If

t

h

e

reflecte

d

signal

retur

ns before

t

h

e

pulse

is

en

d

ed,

it

ad

ds

to or

subtracts

from

t

h

e

am

p

lit

u

de

of

t

hepulse

.

Th

is

distorts

t

he p

ulse

s

h

ape

a

nd

amplitude

.

M

atc

h

ing

N

etwor

ks

.

T

he

following

d

escribes

met

h

ods

for

matc

h

ing

impedance

networ

k

s

i

n

to

relatively

low

impedances

.

If

t

h

e

F

G

501

is

d

rivi

ng α

h

ig

h

impe

d

ance,

suc

h as

t

he

1

ΜΩ

i

np

ut

impedance

of

t

h

e

vertical

inpu

t

for

an

oscilloscope,

t

h

e

transmissio

n

line

must be

termi

n

ate

d

REV

.

Β

JUL

197

8

Selects

sine,

triangle,

square,

ramp,

and

pulse

output

waveforms

.

Pulse

and

ramp

waveform

duration

is

1/2f

.

See

Operating

Con-

siderations

for

addi-

tional

information

.

Concentric

with

OFF-

SET

control

.

Varies

am-

plitude

of

waveform

at

the

OUTPUT

connector

from

less

than

500

mV

(fully

ccw)

to

20 V

p-p

open

circuit

(

S N

B130000-up)

.

For

SN

below

8130000,

con-

trol

is

label

OUTPUT

and

provides

a

maximum

of

15

V

p-p

open

circuit

.

REV

C,

MAR

197

9

FUNCTION

Selector

AMPL

Control

OFFSET

Control

Concentric

with

AMPL

contrN

.

For

S

N

13130000-up,

control

pullout

provides a

var-

able

dc

offset

voltage

from

zero

(centered)

to

either

--

7

.5

V

(fully

cew)

or



+7

.5

V

(fully

cw)

.

When

pushed

in

pro-

vides

zero

off-set,

For S

N

below

B130000

control

does

not

pull

out

and

offset

limits

are

-

5

V

to

+5 V

.

PHASE

Control

When

pulled

out provides

continuously

variable

selection

of the

gated

output

waveform

start

level

(phase)

from

+90

0

(fully

ccw)

to

-90

0

(fully

cw)

referenced

to

the

sine

or

triangle

waveform

0

0

starting

point

.

Used

in

conjunction

with

the

GATE

INPUT

connector

when

operating

in

gated

output

(burst)

mode

.

TRIG

OUTPUT

Connector

Bs

m

connector

that

pre

vides

a

+2

.5

V

square-

wave

trigger

output

into

a

600

0

load,

OUTPUT

Connector

Bnc

connector

that

pro-

vides

the output

wave-

form

selected

by the

FUNCTION

selector,

POWER

Indicator

GATE

INPUT

Connector

A

brie

connector

for

applying

a

+2

V

to

+15

V

gating

signal to

the

generator

.

Fig

.

1-3

.

Operating

controls

and

connectors

.

when

power

is

ap-

the

FG

501

.

Operating Instructions-FG

501

FREQUENCY

Hz

Dial

The frequency

of

sine,

triangle

and

square

waveforms

is

the

dial

reading

times

multiplier

.

Ramp

arid

pulse

wave-

forms

have

a

frequency

approximately

1

.6X

dial

setting

times

multiplier

with the

MULTIPLIER

at

1

or

above

and

a

fre-

quency

of

approximately

2X

dial

setting

on

the

three

lowest ranges

of

the

MULTIPLIER

selec-

tor

.

Provides

vernier

selec-

tion of

output

frequency

from

the

fully cow

(calibrated)

position

to

approximately

0

.35%

of

full

scale

in

the

fully

ccw

position

.

MULTIPLIER

Selector

Selects

frequency range

in

9

decade

steps

and

provides

three

"hold"

positions

(between

the

lowest

three

multiplier

positions)

that

hold

the

generator

output

at

any

desired

instantaneous

voltage

level

.

Bnc

connector

for

apply-

ing

an

external

voltage

for

controlling

the

output

frequency

o

f

the

generator

.

A

10

V

input

provides a

frequency

range

of

1000

:

1

.

1431-13A

O

perating

Instructions-FG

501

into

α

50

Ω

attenuator

and

α

50

Ω

termination

at

the

oscilloscope

input

.

The

attenuator

isolates

the

input

capacity

of

the device

.

Distortion

can

be

caused

by

this

input

capacity

.

Α

simple

resistive

impedance-matching

n

etwork

t

hat

p

rovides

minimum

attenuation

is

illustrated

in

F

ig

.

1-4

.

To

match

impedance

with

t

he

illustrated

network,

the

follow-

i

n

g

co

n

ditio

ns

must

exist

:

and

Th

erefore

:

(R,

+

Ζτ

)

R

τ

m

u

st

eq

ual

Ζ

,

R

,+

Ζτ

+

R

z

R,

+



Z,

R

2



must

equal Ζτ

Z,+

R

z

R

ι

R

z

=

ΖιΖ

z

;

and

R

ιΖι

=

R

z

(

Ζτ

-

Ζ

I

)

or

R

ι

=



Ζτ

(

Ζτ

-

Ζι

)

and

R

z

=

Ζι

-

\

Ι



Ζ

2

Ζ

_

τ

Ζ

,

F

or

exam

p

le

;

to

matc

hα50

Ω

system

to

α

125

Ω

system,

Ζ

,

eq

uals

50

Ω

a

n

d

Ζ

2

eq

uals

125

Ω

.

Th

erefore

:

R,=-\/i25-(125-50)

=96

.80

an

dR

2

=

50



125

25

50

-

64

.6

Ω

Wh

en

co

n

structi

n

g

suc

h

α

d

evice,

t

h

e

environme

n

t

surrounding

t

h

e

compo

nents

s

h

ould

also

b

e

design

ed

to

provide α

transition

b

etwee

n

t

he im

p

edan

ces

.

K

eep

in

mind

t

h

at

t

h

e

c

h

a

r

acteristic

im

p

eda

n

ce

of

α

coaxial

d

evice

is

determined

by

t

he

ratio

b

etwee

n

t

h

e

outsi

de diameter

of

t

h

e

in

ne

r

conductor

to

t

h

e

i

n

si

de

d

iameter

of

t

he

outer

cond

uctor

.

τ

ο

=

138/

ε

log,o

D/d,

w

here

D

is

t

h

e

i

n

side

diameter

of

t

h

e outer

con

d

uctor,

a

n

d d

is

t

he outside

diameter

of

t

he

in

ne

r

conductor

.

ε

is

t

h

e

dielectric

co

n

s-

tant

(1 in

air)

.

Attenuation

R

atios

.

Th

o

u

g

h

t

he

networ

k

i

n F

ig

.

1-4

provi

d

es mi

n

imum

atte

n

uatio

n fo

r

αpu

r

ely

resistive

im pe

d

a

n

ce-matc

h

i

n

g

d

evice,

t

h

e

atte

nu

atio

nas seen

from

o

ne

end

does

not eq

ual

t

h

at

see

n

from

t

he

ot

he

r

en

d

.

Α

signal

(

Ε

,)

ap

p

lied

from

t

h

e

lower

impeda

n

ce

sou

r

ce

(

Ζ

,)

en

cou

n

ters

α

voltage

atte

n

uation

(

Αι

)

w

h

ic

h

is

g

r

eater

t

han

1

an

d

less

t

han

2,

as

follows

:

Α

,

=Ez =

Ζτ

+

1

Fig

.

1-4

.

I

mp

edance-match

i

ng

n

etwor

kth

at pr

ovi

d

es

m

i

n

im

um

attenuatio

n

.

Α

sig

n

al

(

Ε

2)

app

lied

from

t

he

h

ig

h

er

im

ped

an

ce

source

(

Ζ

2)

en

cou

n

ters

α

greater

voltage

atten

u

atio

n

(

Α

2)

wh

ic

h

is

greater

t

han

1

a

nd

less

t

h

an

2

(Z2/Z,)

:

_

Ετ

__

R'

+

R'



+

1

Az

=



Ε

ι



Rz



_EL

In

t

h

e

example

of

matc

hing 50

Ω

to

125

Ω

.

Α

'



925

+1=1

.77

Α

2

=

96

.8

+

96

.8

+

1

=

4

.44

64

.6

50

T

he

illustrated

n

etwor

k

can

b

e

mo

d

ified

to

p

rovide

different

attenuatio

n

ratios

by

ad

d

i

ng anot

h

er

resistor

(less

t

han

R,)

betwee

n

Ζ

,

an

d

t

h

e

j

un

ctio

n

of

R,

an

dR

z

.

Duratio

n

of

R

amps

and

P

ulses

Th

ed

uration

of

ramp

an

d

p

u

lse

waveforms

is

always

eq

ual

to

t

he h

alf-cycle

time

of

t

h

e

sine,

square,

or

triangle

waveform

freque

n

cy

.

For

MUL

TI

PL

I

ER

setti

n

gs

of

1

or

greater,

t

he

retrace/off

time

is

suc

h

t

h

at

t

h

e

waveform

h

as

αdu

ty

cycle

of

approximately

80

ο

/

ο, i

.e

.,

fre

quen

cy

equals

a

pp

roximately

1

.6

Χ

FRE

Q

UEN

CY

Hz

dial setti

n

g

.

For

MUL

TI

PL

I

ER

setti

n

gs

less

t

h

an

1,

t

h

e

retrace/off

time

is

from

10

ms

to

100 ms,

w

h

ic

h

results

i

n duty

cycles

a

pproaching

100

ο/ο

;i

.e

.,

frequency

equals

approximately

2

Χ

FRE

Q

UEN

CY

Hz

d

ial

setting

.

REV

.

Β

JUL

197

8

Free-

R

u

nn

ing

O

u

tput

T

he

following

proced

u

re

provi

d

es

α

fr

ee-run

n

ing

waveform

outp

ut

wit

h

variable

fre

q

ue

n

cy

an

d

amplitude

.

1

.

Set

t

h

e

A

MPL

control

to

t

he

fully

co

u

ntercloc

k

wise

p

osition

and

t

he

O

FF

S

E

T

co

n

trol

to

t

he 0 (cen

tered)

positio

n

.

C

h

eck

t

h

at

t

he

PH

AS

E

co

n

tr

ol is

pus

h

ed

in (off)

.

2

.

Set

t

he

FUN

CTIO

N

selector

to

t

h

ed

esired

waveform

(see

F

ig

.

1-5)

.

F

ig

.

1-5

.

O

u

t

p

ut

wavefo

r

ms

availa

b

le

f

r

om

t

he F

G

501

.

3

.

Select

t

he

desire

d

fre

quen

cy

wit

h

t

h

e

MUL

TI

PL

I

ER

selector

a

nd

FRE

Q

UEN

CY

Hz

d

ial

.

F

or

exam

p

le,

if

t

h

e

MUL

TI

PL

I

ER

selecto

r

is

set

to

t

he10

5

p

osition

an

d

t

h

e

FRE

Q

UEN

CY

Hz

d

ial

is

at

5,

out

p

ut

fre

q

ue

ncy

is

500

kH

z

;

i

.e

.,

MUL

TI

PL

I

ER

setting

Χ

FRE

Q

UEN

CY

Hz

setti

ng

.

T

h

e

output

fre

q

ue

n

cy

is

calibrated

w

h

e

n

t

h

e

FRE

Q

UEN

CY

VERN

I

ER

control

is

in

t

h

e

fully

cloc

k

wise

p

ositio

n

.

T

h

e

d

uratio

n

of

ram

p

a

n

dpulse

waveforms

is

depende

n

t

on

t

he

MUL

TI

PL

I

ER

setti

n

g

.

See

Duration

of

R

am

p

s

an

d

P

ulses

under

O

p

erating

Co

n

si

d

eratio

n

s

for

furt

h

er

i

n

formatio

n

.

4

.

Connect

t

h

e

loa

d

to

t

he

O

U

T

PU

T

connecto

r

and

a

dj

ust

t

he

A

MPL

co

n

trol

for

t

h

e

desired outp

ut

am

p

litu

de

.

V

a

r

iable

DC

Offset

Pull

outwar

d

on

t

he

O

FF

S

E

T

con

trol (pull

switc

h

a

dded

at

S

N

13020000)

to

positio

n

t

h

edo

level

(baseli

n

e)

of

t

h

e

outpu

t

waveform

.

F

or

exam

p

le,

+5

V

of offset

will

i

n

c

r

ease

t

he

do

+

p

eak ac voltage

of

α7

.5

Vρ

-

ρ

out

p

ut

to

+5

and

+12

.5

V

do

+

p

ea

k

ac

w

h

ile

-5

V

of offset

will

re

d

uce

t

h

e

d

o

+

pda

k

ac

outp

ut

to

+2

.5

V

a

nd

-5

V

.

REV

.

C

JUL

197

8

O

PER

ATIO

N

Ope

r

ati

n

g

I

n

st

ru

ctio

n

s-

F

G

501

Gate

d

(

B

urst)

Output

an

d

V

ariable

Ph

ase

Α

gating

sig

n

al

of

2

to

15

V

amplitu

d

e a

pp

lie

d

to

t

he

GAT

E

I

NPU

T

connector

wit

h

t

h

e

PHAS

E

control

pu

lled

out

will

provide

α

burst

of

cycles

at

t

he

O

U

T

PU

T

co

nn

ector

.

T

he

d

uration

of

t

h

e

burst

a

nd nu

mber

of

cycles

in

t

h

e

bu

r

st

depen

d

on

t

h

e

gati

ng

signal

du

r

atio

n an

d

t

he

output

fre

q

uen

cy

selecte

d

.

Wh

en

t

h

e

gati

ng

sig

n

al

goes

to

t

h

e

zero

level,

t

he

ge

n

erator

completes

its

last

cycle an d

remains q

uiescent

un

til

t

h

e

n

ext

gating

signal

.

Si

ngle

cycles

can

b

e obtained

by a

p

plyi

ng

α

gati

ng

signal

wit

h

α

perio

d

approximately

equal

to

t

he

p

erio

d

of

t

he

F

G

501 ou

tput

waveform

.

T

he

n

um

b

er of

cycles pe

r

b

urst

can be ap

p

roximated by

d

ivi

d

i

n

g

t

he

gating

sig

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by

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t

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e

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GAT

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T

OUT

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OUTPUT

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I

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OUTPUT

PH

AS

E

co

n

tr

ol

at

90

°

L

AG

PH

AS

E

co

n

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at

0

°

PHAS

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co

n

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90

°

LE

AD

1431-04

F

ig

.

1-6

.

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h

variable

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ase

.