Tektronix FG503 Manual de usuario

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BEFORE

READING

070-1727-00

PLEASE

CHECK

FOR

CHANGE

INFORMA

TION

THE

REAR

THIS

MANUAL

THIS

MANUAL

REPRINTED

FEBRUARY

1978

503

FUNCTION

GENERATOR

INSTRUCTION

MANUAL

Tektronix,

Inc

Box500

Beaverton,

Oregon

97005



Serial

Number

First

Printing

APR

1974

TEKTRONIX°

TABLE

CONTENTS

SECTION



OPERATING

INSTRUCTIONS



Page

Introduction



1-1

Instrument

Description



1-1

Initial

Operation



1-1

Functions

Available

Rear

Connector



1-2

Operating

Considerations



1-2

Output

Connections



1-2

Risetime

and

Falltime



1-2

Impedance

Matching



1-2

Basic

Operation



1-4

Free-Running Output



1-4

Voltage-Controlled

Frequency

(VCF) Output



1-4

Custom

Timing

Capacitor

Selection



1-5

Typical

VCF

Application



1-6

Electrical

Characteristics



1-7

Repackaging

for

Shipment



1-8

SECTION



THEORY

OPERATION

Introduction



2-1

Triangle

Generator



2-1

Sine

Shaper



2-1

Output

Amplifier



2-2

Power

Supplies



2-2

SECTION



SERVICE

INFORMATION

Symbols

and

Reference

Designators



3-1

Electrical

Replaceable

Parts

List



3-2

Front

Panel

Controls

and

Connectors

Calibration

Procedure

Services

Available

Maintenance

Test

Equipment

Parts

Location Grid

Rear

Interface

Connector Assignments

Block

Diagram

Generator

Loop

Schematic

Output

Amplifier

Schematic

Power

Supplies

Schematic

Mechanical

Replaceable

Parts

List

Exploded View

Accessories

CHANGE

INFORMATION

503

Section

1-FG

503

OPERATING

INSTRUCTIONS

INTRODUCTION

The

variety

swept

and modulated

signals

available

from

the

503

make

especially

useful

for

such

applications

testing

servo-system

amplifier

response,

distortion

and

stability

also

useful

for

POWER

MODULE

Barrier

generation

or as a

variable

beat-frequency

oscillator

The

square

wave

trigger

output

can

used

source

for

The

503

Function

Generator

designed

operate



TTL

logic,

synchronize

external

device

such

asan

500

series

power

module

Low

distortion

sine,



oscilloscope

counter

square

and

triangle

waveforms

from

to 3

MHz,

are

available

the

front

panel

square

wave

trigger

also

available

the

front

panel

Variable

offset



INITIAL

OPERATION

±5

provided

INSTRUMENT

DESCRIPTION

custom

timing switch

position

provided

This

allows

the user

install

timing

capacitor

for

custom

tailoring

the

frequency

range

the

503

voltage-controlled

frequency

(VCF)

input

controls

the output

frequencyfrom

external

voltage

source

The

output

frequency

can

swept above

below

the

selected

frequency,

maximum

1000

:1,

depending

the

polarity

and

amplitude

the

VCF

input

and

the

selected

output

frequency

REV

MAR

1976

Top

Groove

Bottom

Groove

Fig

1-1

503

InstaIlatlon

and

removal

CAUTION

Turn

the

Power

Module

off

before

inserting the

plug-

;

otherwise,

damage

may

occur

the

plug-in

circuitry

The

503

calibrated

and

ready

for

use

when

received

designed

operate

any

compartment

the

500

series

power

module

Refer

the

power

module

instruction

manual

for

line

voltage

requirements

andpower

module

operation

See

Fig

1-1

for

installation-

removal

procedure

Check

that

the

503

Ily

inserted

the

powermodule

Pull

the

PWR

switch

the

power

module

Check

that

the

green

POWER

light

the

503

The

Controls,

Connectors

and

Adjustments

foldout

Slot

503

PLUG-IN

Operating

Instructions-FG

503

page

Section

gives

acompletedescription

the

front



slot

between

pins

and

the

rear

connector

panel

controls

and

connectors



identifies

the

503

amember

the

signal

source

family

barrier

may

inserted

the

corresponding

position of

the

power

module

jack,

prevent

other

than

signal

source

plug-ins

from

being

used

that

compart-

FUNCTIONS

AVAILABLE

REAR

CONNECTOR



ment

This protects

the

plug-in

should

specialized

con-

nections

made

that

compartment

Consult

the

Refer

the

rear

connector

assignment

illustration



Building

System

section

the

power

modulemanual

the

Service

Section

this

manual

for

assignments



for

further

information

RISETIME

AND

FALLTIME

OPERATING

CONSIDERATIONS

OUTPUT

CONNECTIONS



introduced

will

not

exceed

This

error

can

genera~iy

ignored

When

the

rise

falltime

the

test

device

less

The

output

the

503

designed

operate

as a



than

ten

times as'long as the

combined

risetimes

the

voltage

source

working

into

a50

load

higher



testing

system,

the actual

risetime

the

device

must

frequencies,

unterminated

or improperly terminated



determined

This

found

from

the

risetime

each

output

will

cause

excessive

aberrations

the output



component

making

the

system

The

total

risetime

waveform

(see

Impedance

Matching

discussion)

Loads



equals the

square

root of

the

sum

the

squares

the

less

than 50

will

reduce

the

waveform

amplitude



individual

risetimes

R,=

(R,)

(Rz)

. .

.Conversely,

the

risetime of

the

device

under

test

can

be found,

from

the

same

relationship,

the

actual

risetimes

the

system

are

Excessive

distortion or

aberrations,

due

improper



known

termination, are

less

likely

occur

the

lower

frequen-

cies

(especially

with

sine

and

triangle

waveforms)

ensure

waveform

purity,

observe

the

following

precautions

Use

good

quality

coaxial

cables

and

connec-

tors



Make

all

connections

tight

and

as shortas

possible

The

physical

and

electrical

characteristics

the pulse

transmitting

cable

determine

the

characteristic

im-

pedance,

velocity of

propagation,

and

amount

of signal

loss

Signal

loss,

the

frequency

;

therefore,

few

feet

cable

can

attenuate

high

frequency

information

fast-rise

pulse

important

therefore, to

keep

these

cables as short as

practical

Use

good

quality

attenuators,

necessary



When

signal

comparison

measurements

time

reduce

waveform

amplitude

sensitive

circuits



difference

determinations are

made,

the

two

signals

from

the

test

device

should

travel

through

coaxial

cables

with

identical

loss

and

time

delay

characteristics

Use

terminators

impedance-matching

devices

avoid

reflections

when

using

long

cables

(six

feet

more)



there

voltage

across

the

output

load,

theoutput

pulse

amplitude

will

compressed,

some

cases

(if

the

voltage

exceeds

±10

V),

may

short

the

output

Ensure

that

attenuators,

terminations,

etc

have



prevent

this

from

occurring,

the output

must

coupled

adequate

power

handling

capabilities

for

the

output



through

blocking capacitor

the

load

The

time

waveform



constant

the

coupling capacitor

and

load

must

long

enough

maintain

pulse

flatness

IMPEDANCE

MATCHING

the output pulse

from

the

503

used

measure

the

rise

falltime

device,

consider the

risetime



pulse

travels

down

transmission

line,

each

time

characteristics

the

associated

equipment

used

the



encounters

mismatch,

different

impedance

than

that

risetime

the

device

under

test

least

ten

times



the

transmission

line,

reflection

generated

and

sent

greaterthanthecombinedrisetimesoftheFG

503plusthe



back

along the

line

the

source

The

amplitude

and

monitoring

oscilloscope

and

associated

cables,

the

error



polarity of

the

reflections

are

determined

the

amount

the

encountered

impedance

relation

to the

characteristic

impedance

the

cable

the

mismatch

impedance

higherthan

the

line,

the

reflection

will

the

same

polarity

the

applied

signal

it is

lower, the

reflection

will

opposite

polarity

the

reflected signal

returns

before

the

pulse

ended,

adds

subtracts

from

the

amplitude

the

pulse

This

distorts

the

pulse

shape

and

amplitude

the

503

driving

high

impedance

such

the

MS2

input

im-

pedance

(paralleled

a stated

capacitance)

of the

vertical

input to

anoscilloscope,connectthetransmission

line to

attenuator,

termination,

and

then

the

oscilloscope

input

The

attenuator

isolates

the

input

capacitance

of the

device,

and

the

503

properly

term

nated

simple

resistive

impedance-matching

network,

that

provides

minimum

attenuation,

illustrated

Fig

1-2

matchimpedance

with

the

illustrated

network,

the

follow-

ing

conditions

must

exist

Therefore

(R,

Zz)

must

equal

R~+Zz~



Z`Rz



must

equal

For

example,

match

system

125

system,

equals

and

equals

125

Therefore

and

(Low)

Operating

Instructions-FG

503



125(125

50)

ohms

125



ohms

125-50

(High)

Fig

1-2

Impedance

matching

network

that

provides

minimum

attenuation

When

constructing

such

a device,

the

environment

surrounding

the

components

should be

designed

provide

transition

between

the

impedances

The

characteristic

impedance

coaxial

device

deter-

minedby

the

ratio

between

the

outside

diameter

the

inner

conductor

the

inside

diameter

of the

outer

conductor,

138

IOg~o

RiRz

Z~Zz

;

and

R,Z~

Rz(Zz

Zi)



the

inside

diameter

of the

outer

conductor,

the

diameter

the

inner

conductor,

and

F is

the

dielectric

constant

air)



Zz(Zz

Zi)

The

network

shown

Fig

1-2

provides

minimum

attenuation

for a

purely

resistive

impedance-matching

device

The

attenuation

seen

from

oneenddoes

not

equal

that

seen from

the

other

end

signal

(E,)

applied

and



from

the

lower

impedance

source

encounters

voltage

attenuation

(A,)

that

greater

than

and

less

than

follows

Operating

Instructions-FG

503

signal

(Ez)

applied

from

the

higher

impedancesource



and

(Zz)

encounters

greater voltage

attenuation

(Az)

that

greater

than

and

less

than

2(Zz/Z,)

Ez R1

the

example

matching

125

f2,



The

illustrated

network

can

modified,

provide



.77



different

attenuation

ratios,

adding another

resistor

125



(less

than

R,)

between

and

the

junction

of R,

and

FREE-RUNNING

OUTPUT



MULTIPLIER

setting,

applying

signal

the

VCF

connector

may

necessary

vary the

CAL

control

obtain

the

full

1000

swept

range

the

lowest

swept

frequency

desired

See

Fig

1-4 for

maximum

VCF

range

for

each

MULTIPLIER

setting

Set the

AMPLITUDE

control

fully

clockwise

Notice

the

two

identical

sets of

waveforms

near the

FUNCTION

selector

the

front

panel

The

three

waveforms

the

lightly

shaded

area

allow

use

the

OFFSET

control

;

the

other

three

not

Select

the

desired

waveform

with

without

offset

See

Fig

1-3

Select

the

desired

frequency

with

the

MULTIPLIER

and

FREQUENCY

dials

The

output

frequency

calibrated

when

the

FREQUENCY

VERNIER

control

the

full

clockwise

position

Connect

the

load

the

OUTPUT

connector

and

adjust the

AMPLITUDE

control

for

the

desired

output

amplitude

Fig

1-3

Output

waveforms

available

from

the

503

VOLTAGE-CONTROLLED

FREQUENCY

(VCF)

OUTPUT

BASIC

OPERATION



.43



MHz

300



300 kHz



kHz

10'



3 kHz



300

10'



30 Hz

.01

*~ 5

10_

- '

10'

10' 10'

10'

When

using

the

offset

feature

select

the

waveform



(



FREQUENCY

desired

the

light

shaded

area

Now

adjust

the

OFFSET

control

position

the

level

(baseline) of

the

output



ust

mized

sweep

at least

1000

within

this

range

waveform

above

below

desired



Fig

1-4

Graph

showing

range

frequencies

for

each

MUL-

TIPLIER

setting

that

canbe swept

with

signal

applied

the

VCF

input

The

polarity

the

VCF

input

signal

determines

the

The

output

frequency

the

503

can

swept

over a



direction

the output

frequency

swept

from

thefrequen-

frequency



range



1000

:1,



depending



the



set

the

MULTIPLIER,

FREQUENCY

Hz,

and

VER-

REV

JULY,

197

Operating

Instructions-FG

503

NIER

controls

positive-going

voltage

raises

the

fre-



range

kHz

desired

Fig

1-4showsthat

quency,

while

negative-going

voltage

lowers the

fre-



fixed

multiplier

setting

includes

the

desired

limits

The



quency

voltage

that varies

symmetrically

about



value

the

capacitor

that

must

installed

determined



sweeps

the output

frequency

symmetrically

about

the



the

following

formula



center

frequency

determined

the

frequency

controls



300

See

Fig

1-5



Ccus



Fmax



Since

the

VCF

input

amplitude

versus

frequency

linear

relationship,

the

frequency

output

range

may

determined

from

the

VCF

input

amplitude

Use

fixed

voltage

and

frequency

counter

or other

comparison

method,

accurately

determ

ine

theoutput

frequency

and

VCF

voltage

relationship

Refer

the

test

under

the

heading

Response

Analysis

for

typical

application

using

the

VCF

feature

CUSTOM

TIMING

CAPACITOR

SELECTION



The

capacitor

selected

must be

a low

leakage

non-

polarized

type

within

the

range

100

and

This

feature

allows

the

user

custom

select

swept



must

have

least

a 10

rating

Ceramic

and

mylar

frequency

range

For

example,

assume

swept

frequency



capacitors

work

well

this

application

VCF

OUTPUT

VCF

SWEPT

FREQUENCY

RANGE

where



~F,

and

Fmax,

Hz,

the

maximum

frequency

required

Apply

the

formula

to the

example

;

(

rcus

-5

VCF



-5

OUTPUT

300

20x10'

Fig

1-5

Swept

frequencyrange

with

signals

applied

VCF

Connector



0.015

+5V

Operating Instructions-FG 503

Remove

the

left

side

cover

the

503

Refer



TYPICAL

VCF

APPLICATION

Fig

1-6 for

capacitor

location

Solder thecapacitor

the

test

points located

on the

left

rear

side

the

circuit

board

shown

Fig

1-(i

Finally,

set

the

MULTIPLIER

control



The



503

particularly

suited

for

determining

the

position,

and

apply the

correct voltage

the

VCF



response

characteristics

circuits

systems

This

connector

Set

the

FREQUENCY

and

FREQ

VER-



application

utilizes

the

VCF

input

the

503

sweep

NIER

dials

for

the

desired

swept

frequency

range



the

generator over

range

frequencies

applying

the

desired

waveform

from

the

503

a device

under

test,

The

calibration

marks

the

FREQUENCY

dial

are



and

sweeping

the

waveform

frequency

over a

selected

not

appropriate

for

use

directly

determining

frequency



range,

various

response

characteristics

can

observed

the

custom

range

position

possible

however,



monitoring

oscilloscope

custom

calibrate

the

dial,

since

the

linearity

the

FREQUENCY

dial

calbration

not

changed

the

custom

position

Fig

1-6

Custom

timing

capacitor

location

Fig

1-7

Phase

relationships

between

various

OUTPUT

waveforms and

the

TRIG

OUT

waveform

TRIG

OUT

Waveform

Squarewave

Triangle

Waveform

Sinewave

The

following

procedure

describes

technique

for

determining response

characteristics

any

frequency

sensitive

device

that

operates

within

the

frequency

range

the

503

Refer

the

Voltage-Controlled

Frequency

(VCF)

Output

discussion

for

additional

information

Connect

the

equipment

shown

Fig

1-8

Set the

MULTIPLIER

selector

and

FREQUENCY

dial

for the

desired

upper

or lower

frequency

limit

(depending

the

direction

you

may

wish

sweep)

See

Fig

1-4

for

VCF

ranges

and

MULTIPLIER

settings

Apply

the

desired

waveform

the

VCF

connec-

tor

Adjust

the

amplitude

the

VCF

input

waveform

for

the

desired

output

frequency

range

Observe

the

response

characteristics

the

monitoring

oscilloscope

The

frequency

which

a displayed

response

characteristic

occurs

can

determined

first

removing

the

VCF

input

waveform,

then

manually

adjusting

the

FREQUENCY

dial

again

obtain

the

particular

characteristic

observed

the

swept

display

Then

read

the

frequency

the

FREQUENCY

dial

REV

MAY,

197

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