Tektronix SW503 User manual

NCT`Rt7IrV

sw~a~

SWEEP

GENERATaR

IIVSTFILICTION

MAIti1L1AL

TABLE

CONTENTS

Section



DESCRIPTION



Page

INTRODUCTION



1-1

ELECTRICAL

CHARACTERISTICS



1-1

ENVIRONMENTAL

CHARACTERISTICS



1-2

Section



OPERATION

FRONT

PANEL

CONTROLS

AND

CONNECTORS



2-1

OPERATING

INSTRUCTIONS

AND

NOTES



2-4

General

Setup

and

First-Time

Operation



2-4

Cable

Connections



2-5

Impedance

Matching



2-5

Detecting

(Demodulating)



2-5

.2 .5

Sweep

Rate

Effects



2-6

.2 .6

Overloading

Effects



2-6

Low-Level

Measurements



2-6

Receiver

Interference



2-6

Use

with

Digital

Counter



2-6

.10

Operation

with

X-Y

Plotters



2-6

EXTERNAL

CONTROL



2-7

Frequency

Control



2-7

Amplitude

Control



2-7

.3 .3

Trigger Control



2-7

WARNING

The

remainder

this

table

contents

refers

servicing

instructions

which

should

performed

qualified

personnel

only

Section 3



CALIBRATION

INTRODUCTION



3-1

EQUIPMENT

REQUIRED



3-1

PRELIMINARY

STEPS



3-2

PROCEDURE



3-2

Section



CIRCUIT

DESCRIPTION

GENERAL



4-1

SWEEP

RAMP

GENERATOR



4-1

Basic

Operation



4-1

.2 .2

Ramp

Generator



4-2

Single

Sweep



4-2

.2 .4

Line

Rate



4-3

.2 .5

Mode



4-3

.2 .6

MANuaI

Mode



4-3

503

OPTIONS

TABLE

CONTENTS

(cont)

Section 4



CIRCUIT

DESCRIPTION

(cont)



Page

Section 5



IMPLEMENTING

SPECIAL

FEATURES

Section 6



REPLACEABLE

ELECTRICAL

PARTS

Section



DIAGRAMS

AND

CIRCUIT

BOARD

ILLUSTRATIONS

Section



REPLACEABLE

MECHANICAL

PARTS

CHANGE

INFORMATION

SWEEP

DRIVE

CIRCUITRY



4-3

Input

Adder



4-3

Ramp

Shading

Network



4-3

Output

Amplifier



4-5

SWEEP

OSCILLATOR

MODULE



4-5

OSCILLATOR

MODULE



4-5

HARMONIC

MARKER

MODULE



4-7

MARKER

AMPLIFIER



4-7

COUNTER

INTERFACE



4-9

CHANGING

HORIZONTAL

OUTPUT

VOLTAGE



5-1

INTERFACE

THROUGH

REAR

CONNECTOR



5-1

Introduction



5-1

Mainframe

Modification



5-1

Vertical

Output

and

Horizontal

Output



5-1

External

Frequency

Control

Modulation



5-2

External

Amplitude

Control

Modulation



5-2

External

Trigger



5-2

Digital

Counter

Interface



5-3

LIST

ILLUSTRATIONS

Page

Figure

1-1



503

RFSweep

Generator



Frontis

Figure

2-1



503

Front Panel



2-2

Figure

2-2



Typical

operating setup



2-4

Figure

2-3



Typical

resistive

pads



2-5

Figure

2-4



Basic

detector

schematic

diagram



2-5

Figure

2-5



Errors

from

sweep

rate

effects



2-6

Figure

2-6



Markers

selection

switch

location



2-6

Figure

2-7



External

control

frequency



2-7

Figure

2-8



External

control

amplitude



2-7

Figure

3-1



503

rear

view



3-2

Figure

3-2



SCOPE

HORIZ

waveform

seen

test

oscilloscope



3-2

Figure

3-3



503

adjustment

locations,

left

side



3-3

Figure

3-4



503

adjustment

and

test

points

locations,

right

side



3-4

Figure

3-5



Normal

interconnections

for

calibration



3-4

Figure

4-1



503

sweep

ramp

generator

(simplified

diagram)



4-2

Figure

4-2



Ramp

shaping

network



4-4

Figure

4-3



sweep

oscillator

module

block

diagram



4-5

Figure

4-4



Harmonic

comb

markers

block

diagram



4-6

Figure

4-5



Counter

interface

signals

sequence



4-8

Figure

5-1



Rear

plug-in

connector

P40

interface

wiring



5-2

LIST

TABLES

Table

5-1



Digital

Counter

Interface

Lines



5-3

503

SU3

srrESr

rron~rnrlr

'.,

,~~

w1A11



ltl

CTII

Film



,-ae,r



3='-

Flgure

1-1

503

RFSweep

Generator

OAT



All][

!!F



QfTECTfO

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son



IIIPIfT



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- ~

DESCRIPTION

INTRODUCTION



Frequency

Sweep

The

503

500-Series

plug-in

that

provides

swept

frequency

MHz

400

MHz

with variable

sweep

rate,

width,

and

output

level

Crystal-controlled

harmonic

oscillators

provide

comb

markers

with

MHz,

MHz

separation

When

used

with

502

Option

Digital

Counter, a

frequency

markerdot

can

positioned

anywhere

within

the

frequency

range

the

503

generator,

and

the

frequency

the

marker can

read

directly

the

counter

the

MANuaI

sweep

and



modes,

the

continuous

wave

output

the

generator

can

read

the

counter

accuracy

Access

jacks

the

front

panel permit

external

signals

control

modulate

the

output

amplitude

and

frequen-

cy,

and

initiate

sweep

The

503

has

a 50

output

impedance

;

the

503

Option

has

output

impedance

Harmonic

Spurii

Down

from

MHz

400

MHz

;

from

MHz

ELECTRICAL

CHARACTERISTICS



MHz

;

and

from

MHz

The

following

characteristics

apply

when

the

503,

combination

with

500-Series

power

module,



Non-Harmonic

Spurii

Down

operating

within

ambient

temperatureof0°Cto+50°C,



froml

MHzto400MHzfundamentalfrequencyrange

after

a 30

minute

warmup

period

Output

Level



The

instrument

mustbe

calibrated

ambient

temperature

between+20°

and+30°

Center

Frequency

Dial

Accuracy

Within

MHz

(readout

accuracy

can

increased by using the

crystal

markers

comb,

the

dot

marker

when

the

503

used

with

502

Option

Digital

Counter)



Drift

<100

kHz/5

minutes

and

MHz/8

hours

after



Step



Attenuator



Absolute



Ac-



30-minute

warmup

a constant

ambient

temperature

;



curacy



(with



respect



zero

5-minute

stabilization

period

required

after

the



attenuation)

dB/10



center

frequency

changed



maximum

±1

NOTE

Range

MHz

400

MHz

Maximum

Width

Selectable

;

400

MHz

(+10%

0%)

Variable

Permits reducing

sweep

width

from

maximum

dca+aose

tt3

ag¢XOximatety

2QQ

kHz

{+nrhe~

[+ttHz

maximum

width

position)

Display

Linearity

(VAR

fully

clockwise)

400

MHz

position

100

MHz

position

MHz

position

Signal

Purity

Section

1-SW

503

Residual

kHz

p-p

less

position

OUT



Maximum

output

approximately

rms

This

corresponds

+10

dBm

±0

into

C2,

+57

dBmV

±0

into

(Op-

tion

Output

level

can

attenuated

steps,

and

avariable

attenuator

This

provides a

range

from

+10

dBm

-60

dBm



for



the



503,



+57

dBmV



-13

dBmV



for

503

Option

Description-SW

503

From-250

+250

(500

p-p

±5%)

with

output

impedance

kS2

internal resistor

can

AUX

output

-2

dBm

minimum

into

termina-



removed

change

the

output

approximately

tion

(same

for

Option



peak-to-peak



with



impedance



kS2

(See

Subsection

for

instructions

BLANKING

Output

blanked

during

sweep

retrace

Blanking

removed

for

manual

and

operation

Frequency

Markers

(Harmonic

Comb)

CAL

(variable

attenuator)

Con-



Sweep

Times



10,

.1,

and

.01

seconds

per

tinuously

variable



sweep,

±5%,

decade

steps

minimum



Variable

control

slows

each

step

factor of

least

ten

from

its

Flatness

Within

peak-to-



calihrated position

peak

over the

frequency

range

Flatness

measured

with

the

AUX

output terminated

into

S2,

maximum

output,

and

with

detec-



Horizontal

Output

for (optional

accessory),

and

in-

cludes

harmonics

Crystal-controlled

harmonic

markers

with

MHz,

or 50

MHz

separation

Marker

width

ad-

justablewith

the

MAX

SWEEP

WIDTH

VARiablecontrol

from

about

400

kHz

kHz and

the

marker

amplitude

adjustable

with

the

SIZE

control

from

about

peak-to-peak

desired,

internal

switch

will

remove

the

negative

portion

the

marker

for

use

with

X-Y

recorder

Marker

size

about

Marker

Accuracy

.005%

marker

selected

External

Frequency

Control

The

full

frequency

range

can

controlled



modulated

rates

kHz

Modulation

sensitivity

approximately

MHz/volt

With

reduced

deviation

and

linearity,

modulation

rates

100

kHz

are

possible



Input

impedance

kf2

External

Amplitude

Control

90%

modulation

can

obtained

modulation

fre-

quencies

kHz

;

the output

level

must

reduced

by the

variable

attenuation

control

Sensitivity

about

peak-to-peak

per

10%

amplitude

modulation

Input

impedance

ks2

Functional

only

when

502

Option

Digital

Counter



EjIVVIRONMEWTAL

CHARAC-

used

with

the

503

The

dot marker can

adjusted

over

the

frequency

span

the

display

;



TERISTICS

accuracy

the dot

frequency

relative

the

display

resolution

and

the

counter

accuracy

The

sweep



Temperature

Range

interrupted

the

dot

position,

count

made,

then

the

sweep

continues



Operating

Range

0°

+50°

Non-Operating

-40°

+75°

Sweep

Mode/Time

Ambient

Temperature

During

Modes



CW,

manual,

timed

sweep,

line



Calibration

+20°C

+30°C

triggered

When

one

the

timed

sweep

speeds, the

sweep

either

free-running,

can

triggered



Altitude

Range

front-panel

button



Operating

Range

15,000

feet

externally-applied

pulse

switch

closure



Non-Operating

50,000

feet

FRONT-PANEL

CONTROLS

AND

SWEEP

MODE/TIME

This

switch

selects

CW,

MANuaI,

timed

sweep,

LINE

synchronized

sweep



position



The

503

produces

output

whose

frequency

dependent

upon

the

CTR

FRED

control

set

ting

(and

EXT

CONTROL,

see

17)

When

a timed

position

selected,

the

VAR

control

can

beused

slow

the

sweep

by a

factor of

about

ten

from

its

calibrated

setting

timed

sweep

recurrent

but

can

manually

or externally

triggered

pulling

the

VAR

control

out

(see

and

17)

TRIG

OPERATION

CONNECTORS



These

pushbuttons

select

crystal-controlled

harmonic

Refer

Figure

2-1

for

locations



(comb)

markers

with

frequency

spacings

MHz,

MHz

The

markers

are applied

the

SCOPE

VERT

connector

and

are

mixed

with

the

detected

input

from

the

device

under

test

MARKERS

NOTE

Section

2-SW

503

internal

switch

removes

the negative-going por-

tion

the

markers,

which

often desirable

when

using

the

503

with

X-Y

recorder

See

Subsec-

tion

.10

MARKERS

SIZE

MAN

position



The

503

provides

output



This

control

varies the

amplitude

the

comb

markers

whose

frequency

dependent



from

about

peak-to-peak

upon

the

CTR

FRED

setting,

and

the

setting

the

VAR

control

(also

the

settings

the

MAX

SWEEP

WIDTH

controls,

see

and



When

the

503

used

with

frequency

counter

with

sweep

stop

logic

such

as the

502

Option

this

control

Timedsweep



positions

intensified

frequency

markerdot

anywhere

the

display

The

frequency

the dot

position

then

positions



The

timed

sweep

positions

are

10,



read

out

the

502

with

digital

counter

accuracy

See

.1,

and

.01

seconds

per

sweep



Subsection

(when

the

VAR

control

set

its

fully

clockwise

position)

DOT

POSition

LINE

position



the

LINE

synchronized

mode,



CTR

FREQ

(Center

Frequency)

the

variable

and

single

sweep

con-



This

multiturn

control selects

the

center

frequency

trots

have

effect



the

OUT

signal

necessary

correlate the

setting

the

CTR

FREQ

and

MAX

SWEEP

WIDTH

controls

avoid

"wrapping

around"

zero

frequency

MAX

SWEEP

WIDTH

Three

pushbuttons

select

maximum

sweep

widths

MHz,

100

MHz,

400

MHz

This

pushbutton

triggers

the

sweepwhen

the

VAR

control

pulled

out

(single

sweep

position)

and

the

SWEEP

TIME/MODE

switch

is in

one

the

timed

sweep

positions



from

the

maximum

selected

sweep

VARiable

(MAX

SWEEP

WIDTH)

The

VARiable

sweep

width

control

reduces

the

width

Operation-SW

503

wsoFrnrE

r,~~



Z1 17 18

GTR

fREn



earw,

Figure

Z-1

503

front

panel

ial



OUTPUT

dBm

(SW

503)or

ATTENUATION



EXT

CONTROL

(SW

503

Option

503



This

six-step

control selects

the



FREQ

output

10-dB

steps

from



This

input

allows

external

signal

frequency

+10

dBm

-40

dBm



modulate

control

the output

signal

Refer

Electrical

Characteristics,

Subsection

.2,

for

signal

requirements

Note

that,

when

used

with

the

SWEEP

MODE/TIME

switch

503

Option



This

six-step

control

selects

the



the



MANuaI



position,

the

external

control



not

attenuation

10-dB

steps

from



dependent

upon

the

settings

the

MAX

SWEEPWIDTH

Maximum

output



controls,

whereas

the

manual

sweep

control

dependent

levels

are

from

+57

dBmV

The

output

calibrated

indicated

when

the

CAL

control

(see

11)

its

fully

clockwise

position

CAL

(VARIABLE

ATTENUATION)

The

CAL

control

adjusts

the

OUT

level

to at

least

below

the

level

indicated

by the

step

attenuator

OUT



(19)

TRIG

This

connector

provides

sweeping

output

signal,

level

selected

by the

attenuator

controls

The

source

impedance

(SW

503) or 75

(SW

503

Option



AUX

TERM

This

connector

provides

sweeping

signal,

for

use



with

frequency

counter

other

instrument

The

output

level

least

-2

dBm

and

independent

attenuator

settings

The

source

impedance

This

connector

allows

returning

the

demodulated

signal

from

the

device

under

test

(through

external

detector

necessary)

for

the

purpose

adding

comb

frequency

markers

This

connector

the output

for

the

combined

demodulated

(from

DETECTED

INPUT)

and

comb

frequency

markers

The

output

applied

the

vertical

input

oscilloscope

display

monitor

DETECTED

INPUT

SCOPE

VERT

SCOPE

HORIZ

This

connector

the output

for

the

sweeping

voltage

that

provided

for

application

the

horizontal

input

oscilloscope

display

monitor

Nominal

output

amplitude

500

p-p

;

internal

wiring

change

will

provide 10

p-p (See

Subsection

)

AMPL

+10

GND

(Ground)

PWR

(Power)

Operation-SW

503

This

input

allows

external

signal to

amplitude

modulate

control

the output

signal

Note

that

for

maximum

usefulness,

the output

amplitude

must

reduced

the

VARiable

attenuation

control

Refer

Electrical

Characteristics,

Subsection

.2,

for

signal

requirements

When

the

VAR

control

the single

sweep

position

(PULL

for

SINGLE

SWEEP),

this

input

allows

external

signal

trigger

the

sweep

The

applied

signal

can

positive-going

pulse

amplitude

and

least

~sduration,orcanbesuppliedbyaswitchclosure(solid

state

mechanical)

the

+10

connector

similar

source

This

connector

provides a

convenient

+10

source

facilitate

using the

above-mentioned

external controls

This

connector

connected

ground

the

circuit

board,

to facilitate

using the

above-mentioned

external

controls,

for

other

signal

ground

purposes

NOT

use

this

connector

for

safety

earth

This

indicator

lamp

shows

when

power

applied

the

instrument

2-3

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