Tektronix 7L13 User manual

070-1673-00

TEKTRONIX

7L13

SPECTRUM

ANALYZER

INSTRUCTION

MANUAL

Tektronix,

Inc

Box

500

Beaverton,

Oregon

97005



Serial

Number

First

Printing

APR

1974

WARRANTY

All

TEKTRONIX

instruments

are

warranted

against

defective

materials

and

workmanship

for

one

year

Any

questions

with

respect

the

warranty,

should

betaken

with

yourTEKTRONIX

Field

Engineeror

representative

All

requests

for

repairs

and

replacement

parts

should

directed

the

TEKTRONIX

Field

Office

representative

your

area

This

will

assure

you

the

fastest

possible

service

Please

include

the

instrument

Type

Number

or Part

Number

and

Serial

Number

with

all

requests

for

parts

service

Specifications

and

price

change

privileges

reserved

1974

Tektronix,

Inc

Beaverton,

Oregon

Printed

the

United

States

America

All

rights

reserved

Contents

this

publication

may

not

reproduced

any

form

without

permission

Tektronix,

Inc

and

foreign

TEKTRONIX

products covered

and

foreign

patents

and/or

patents

pending

TEKTRONIX

registered

trademark

Tektronix,

TABLE

CONTENTS

SECTION

GENERAL

INFORMATION

SPECIFICATIONS

Page

Electrical

Characteristics

1-2

Environmental

Characteristics

1-4

Accessories

SECTION

OPERATING

INSTRUCTIONS

Introduction

2-1

Function

the

Front

Panel

Controls

Operational

Check

2-5

Using

the

Analyzer

2-9

Signal

Application

Resolution,

Sensitivity,

and

Frequency

Span

2-10

Gain

Desensitization

Near

0 Hz

2-11

Using

the

Video

Filter

Selecting

Sweep

Rate

Triggering

the

Display 2-12

Manual

Scan

the

Spectrum

How

Use

External

Sweep

Source

External

Trigger

Operation

Using

the

CAL

OUT

Signal

Reference

for

Accurate

Frequency

and

Amplitude

Measurements

2-13

Using

the

Analyzer

Below

100

kHz

2-14

SECTION

PERFORMANCE

CHECK

Operational

Performance

and

Instrument

Familiarization

3-1

Equipment

Required

Preliminary

Preparation

Check

the

dB/Div

and

LIN

Mode

Calibration

Check

the

Frequency

Readout

Accuracy

3-2

Check

the

Range

the

REF

VAR

Control,

the

Range

and

Accuracy

the

Gain

Selector,

and

the

Gain

Accuracy

the

Pushbutton

Check

the

Operation

the

Video

Filters

3-3

Check

Sensitivity

Check

Spurious

Signals

from

Internal

Sources

(Residual

Responses)

3-5

Check

Resolution

Bandwidth

and

Shape

Factor

Check

Incidental

Wing

3-6

Check

Sweep

Circuit

Operation

with

the

TIME/DIV

the

MANUAL,

and

OFF

Positions

3-7

Performance

Checks

Requiring

Test

Equipment

Required

Check

the

Calibrator

Frequency

3-9

Check

Calibrator

Output

Level

Check RF

Attenuator

Accuracy

3-10

Check

Display

Flatness

Check

Intermodulation

Distortion

3-11

Check

Pulse

Stretcher

Operation

3-12

Check

Triggering

Operation

and

Sensitivity

3-13

Check The

External

Horizontal

Input

Voltage

Requirement

3-14

Check

the

Video

Output

Level

3-15

Check

Frequency

Span

Accuracy

and

Linearity

Check

Time/Div

Accuracy

3-16

TABLE

CONTENTS

(cont)

SECTION

CALIBRATION

Page

Equipment

Required

4-1

Short

Form

Procedure

and Record

Time

Base

Section

Adjust

Sweep

Length,

Offset,

and

Triggering

4-3

Function

Alignment

4-6

Adjust

the

LIN

Mode

Baseline

Offset

Adjust

the

Gain

Compensation

and

Calibrate

the

Reference

Level

1st

Phase

Lock Loop

Error

Amplifier

Offset

Adjustment

4-8

Frequency

Span

and

1st

Calibration

Adjust

the

Frequency

Span

the

1st

and

the

16-19

MHz

Oscillators

Calibrate

the

Center

Frequency

and

Frequency

Readout

4-10

Phase

Lock

Calibration

Adjustments

Adjust

Memory

Gain

4-11

Adjust

Error

Amplifier

Gain

Resolution

Adjust

the

Bandpass

the

105

MHz

Amplifier

and

300

kHz

Filter

4-12

Adjust

the Resolution

Gain

Leveling

Compensation

4-14

Adjust

the

Post

Resolution

Amplifier

Gain

4-16

Minimize

Intermodulation

Products

MHz

Calibrator

Adjust

the

Calibrator

Output

CIRCUIT

DESCRIPTION

Block

Diagram

Description

5-1

Detailed

Circuit

Description

5-2

Microwave

Circuits

Phase

Lock

and

Frequency

Stablization

5-3

YIG

Driver,

Voltage

Memory

and

Phase

Lock

Logic

5-4

Frequency

Tuning

Control

and

Readout

5-5

Tuning

Control

YIG

Driver

Frequency

Span

5-6

Marker

Generator

105

MHz

IF Amplifier,

3rd

Mixer

and

Oscillator

MHz

Pre-resolution

Amplifier

and

Resolution

Filter

Circuits

YIG

Oscillator

Power

Supply

5-7

Filter

MHz

Calibrator

Function

Amplifier

Video

Filter,

Pulse

stretcher,

Baseline Clipper

Vertical

Output

5-8

Frequency Readout

5-9

Uncal

Circuit

5-11

Sweep

Triggering

Sweep

Generator

and

Horizontal

Amplifiers

5-12

TABLE

CONTENTS

(cont)

CHANGE

INFORMATION

SECTION

MAINTENANCE

INSTRUCTIONS

Page

Preventive

Maintenance

6-1

Cleaning

Lubrication

Visual

Inspection

Transistor

and

Integrated

Circuit

Checks

Performance

Checks

and

Recalibration

Troubleshooting

6-2

Troubleshooting

Aids

Diagrams

Circuit

Board

Illustrations

Wiring

Color

Code

Multiple

Terminal

(Harmonic)

Connector

Holders

Resistor

Code

Capacitor

Marking

Diode Color

Code

Transistor

and

Integrated

Circuit

Electrode Configuration

Diode

Checks

6-3

Checks

General

Troubleshooting

Techinque

Corrective

Maintenance

6-5

Obtaining

Replacement

Parts

Repair

and

Exchange

Program

Soldering

Technique

Replacing

Square

Pins

for Multi-pin

Connectors

6-6

Replacing

Assemblies

Front Panel

Controls

and

Selectors

Circuit

Board

Assemblies

6-8

DVM

Logic

and

Readout

Circuit

Board

Replacing

the

Sweep

Circuit

Board

Replacing

the

Function

Circuit

Board

6-10

Replacing

the

Resolution

Circuit

Board

Replacing

Circuit

Boards

the

Honeycomb

Assembly

Replacing

Microwave

Assemblies

Replacing

the

.095

GHz

Filter

Assembly

A10,

or the Multiplier-Bandpass

Filter

A401

6-11

Replacing

the

Multipler

.18

GHz

Bandpass

Filter

and

16-19

MHz

Mixer

Circuit

Board

Assembly

6-13

SECTION

OPTIONS

AND

MODIFICATIONS

SECTION

ELECTRICAL

PARTS

LIST

SECTION

DIAGRAMS

AND

CIRCUIT

BOARD

ILLUSTRATIONS

SECTION

MECHANICAL

PARTS

LIST

Fig

1-1

71-13

Spectrum

Analyzer

INTRODUCTION

GENERAL

INFORMATION

AND

SPECIFICATIONS

Abbreviations

used

the

text

and

diagrams

are

based

ANSI

.1,

1972 Standards

This

manual

divided

into

ten

major

sections

that

provide

the following

information

Section

General

Information

and

Specifications

Contains

the

instrument

description

and

specifications

Section

Operation

Instructions

Information

relative

installing

and

operating

the

instrument

Section

Performance

Check

Provides

procedures

check

the

operational

performance

the

instrument

plus

additional

performance

check

procedures

that

re-

quire

test

equipment

to verify that

instrument

perfor-

mance

accordance

specifications

Section

Calibration

Procedure

Describes

test

equipment

setup

and

adjustment

procedures

required

calibrate

the

instrument

Section

Circuit

Description

Provides

basic

and

general

circuit

analysis

that

may

useful

when

servicing

operating

the

instrument

Section

Maintenance

Instructions

Describes

routine

and

corrective

maintenance

procedures

with

detailed

instructions

for

replacing

assemblies,

sub-

assemblies,

and

individual

components

Troubleshooting

procedures,

plus

general

information

that

may

aid

servicing

the

instrument,

are

also

provided

exploded

drawing

part of

Section

Options

Describes

options

available

for

the

instrument

Section

Electrical

Parts

List

Provides

information

necessary

order

replaceable

parts

and

assemblies

Section

Diagrams

Provides

functional

block

diagram

and

detailed

circuit

schematics

Located

adja-

cent

the

diagram

(usually

the

back

the

preceding

diagram)

are

pictoral

layout

drawings

that

show

sub-

Section

1-71-13

assembly

and

component

locations

logic

diagrams,

waveforms and

voltage

data,

for

troubleshooting

orcircuit

analysis,

are

also

provided adjacent

to or

the

diagram

Section

Mechanical

Parts

List,

Exploded

Drawings and

Accessories

Provides

information

necessary

order

replaceable

parts

The

Parts

List

cross-referenced

the

Electrical

Parts

List

Exploded

drawing

shows

sequence

assembly

and

identifies

assemblies

Changes

and

Corrections

Provides

updating

informa-

tion

for

the

manual

the

form

of inserts

These

inserts

are

incorporated

into

the

manual

text

and

diagrams

when

the

manual

reprinted

DESCRIPTION

The

71-13

Spectrum

Analyzer

high-performance

communication

spectrum

analyzer

that

plugs

into

and

operates

with

the

7000-Series

mainframe

oscilloscopes

swept

front

end

analyzer

that

displays

absolute

amplitude

information

signals

within

the

frequency

span

0 Hz

GHz

Time

domain

characteristics,

within

a 3

MHz

bandpass,

can

also

displayed

Important

features

the

71-13

are

Greater

than

dynamic

range

Sensitivity

down

-128

dBm

Resolution

capability

from

MHz

4) Incidental

Wing

less

than 10

5) Fully

calibrated

display

modes

of either

dB/Div,

Linear

;

and

calibrated

reference

level

dBm

Calibrated

sweep

spans

from

100

MHz/Div

200

Hz/Div

Digital

frequency

readout

Full

range

video

filtering

for

noise

averaging

Baseline

clipping

subdue

the

bright

baseline

displays

when

photographing

10)

Pulse

stretching,

enhance

pulsed

spectra

when

using

wide

frequency

spans

and

resolution

bandwidths

11)

Access

for

tracking

generator

12)

Frequency and

amplitude

reference

calibrator

the

7000-Series

mainframe

features

crt

readout,

the

signal

parameters

and

other

pertinent

information,

such

resolution

bandwidth, video

filtering,

and

frequency

span,

are

displayed

the

crt

readout

simplify

the

operation

the

instrument

Records

can

then be

made

pertinent

data

photographing

the

display

Specification-7L13

The

analyzer

requires

three

plug-in

widths

the

7000-

Series

mainframe

The

following

characteristics

and

features

the

7L13

Spectrum

Analyzer

are

applicable

after

a warmup

period

minutes

CENTER

FREQUENCY

Resolution

the

Center

Frequency

Indicator

Within

MHz

The

center

frequency

indicated

LED

readout

the

7L13

and

crt

readout

when

the

7000-Series

mainframe

has

this

feature

FREQUENCY

SPAN

Calibrated

spans

from

200

Hz/Div

100

MHz/Div

1-2-5

sequence,

plus

and

MAX

SPAN

positions

the

position,

the

analyzer

fixed

tuned

receiver

for

time

domain

analysis

the

MAX

SPAN

position

the

frequency

span

approximately

GHz

Accuracy

Within

5%of

the

indicated

frequency

separa-

tion

Linearity

over the

center

divisions

within

RESOLUTION

Six

resolution

bandwidth

selections

from

MHz,

decade

steps,

are provided

Resolution

bandwidth

may

coupled

uncoupled

from

the

fre-

quency

span

selector

Bandwidth

accuracy

Resolution

bandwidth,

the

down

point,

within

20%

the

resolution

selected

Shape

factor (60

ratio)

better

for

30 Hz

resolution

and

or better

with

resolution

300

except

MHz

Maximum

bandwidth

down

with 3

MHz

resolution,

MHz

Signal

level

change

over the

six

resolution

bandwidth

selections

less

than

ELECTRICAL

CHARACTERISTICS

Range

kHz

GHz

Accuracy

f(5

MHz

20%

the Freq

Span/Div)

STABILITY

(after

a 2

hour

warmup

period)

Within 2

kHz

per

hour

fixed

temperature,

when

phase

locked

;

within

kHz

when

not

phase

locked

INCIDENTAL

(see

Fig

3-5)

(peak-to-peak)

less

when

phase

locked,

and

kHz

(peak-to-peak)

less

for

seconds

when

out

phase

locked

mode

VIDEO

FILTERING

Three

selections

video

filtering

;

10 Hz,

300

and

kHz

are

provided

for

signal or

noise averaging

DISPLAY

LOG

dB/DIV

Provides

calibrated

dynamic

range

with

accuracy

that

within

dB/1

maximum

over

the

full

dynamic

range

LOG

dB/DIV

Provides a

calibrated

dynamic

range

with

accuracy

that

within

dB/2

maximum

over

the 14

dynamic

range

LIN

Provides

linear

display

from

approximately

/jV

(100

dBm)

full

scale, to

.07

volts

(+30

dBm)

Amplitude

linearity

within

10%

over the

graticule height

REFERENCE

LEVEL

Reference

level

operation

calibrated

steps

from

-110

dBm

+30

dBm,

within

(Accuracy

includes

the

attenuator

and

gain

switching

effects

when

the

two

are not

offsetting

each

other

Reference

level

operation

below

100

kHz

becomes

limited

rangefrom

+30

dBm

to-50

dBm

the

center

frequency

approaches

kHz

Reference

level

deviation,

between

display

modes,

less

than 2

from

dB/DIV

to 10

dB/DIV

and

less

than

divisions

from

dB/DIV

LIN

This

deviation

function

the

oscilloscope

vertical

linearity

LINCAL

indicator

signifies

when

the

display

not

calibrated

DISPLAY

FLATNESS

dB,

-2 dB

with

respect

the

level

MHz,

over

any

selected

frequency span

CALIBRATOR

MHz

±0

.01%

with

absolute

amplitude

level

-30

dBm

±0

dB,

25°C

MHz

harmonics

are

generated

provide

comb

markers

for

frequency

span

calibration

SENSITIVITY

(Signal

noise

noise,

LIN

display

mode)

The

following

characteristics

are

applicable

from

100

kHz

GHz

Below

100

kHz

the

sensitivity

degrades

approximately

dB/kHz

;

for

example,

the

sensitivity

kHz

with

resolution

is,

-113

dBm

better

;

kHz,

-98

dBm

better

SPURIOUS

SIGNALS

FROM

INTERNAL

SOURCES

(Residual

Response)

Equal

to or

less

than

-100 dBm,

referred

the

1st

mixer

input

INTERMODULATION

DISTORTION

(Fig

3-6)

100

kHz

GHz

Third

order intermodulation

products

are

down

from

two

-30

dBm

signals

within

any

frequency

span,

second

order

products

are

down

from

two

-40

dBm

signals

within

any

frequency span

100

kHz

Intermodulation

products

(3rd

and

2nd)

are

down

for

the

same

input

level

above

GAIN

The

gain

range

total

eight

position selector

changes

the

gain

(±1

dB)

steps

and

pushbutton

adds an

additional

gain

when

the

REFERENCE

LEVEL

-100

dBm

and

resolu-

tion

bandwidth

used,

the 2

dB/DIV

LIN

mode

Four

positions (blue

sector)

the

selector

provide

change

all

display

modes

The

remaining

four

RFATTENUATOR

NOTE

SWEEP

MODES

AND

RATE

TRIGGERING

Specification-7L13

positions

provide an

additional

gain

only

the

dB/DIV

and

LIN

modes

The

pushbutton

provides

the

additional

gain,

when

the

resolution

bandwith

30 Hz

and

the

REFERENCE

LEVEL

-100

dBm

the

dB/DIV

LIN

mode

The

REF

VARiable

control

provides

continuous

gain

adjustment

between

each

calibrated

REFERENCE

LEVEL

setting

Provides 60

attenuation

calibrated

steps

Accuracy

±0

the

reading,

whichever

greater

The

maximum

input

power

level

the

RFA

ttenuator

watt

average

and

200

watts

peak

+13

dBm

will

destroy

the

1st

mixer

Selection

external

sweep

source,

manual

sweep,

calibrated

sweep

rates

from

s/Div

ps/Div

2-5

sequence

are provided

Sweep

rate

accuracy

within

of that

selected

Three

triggering

sources

can

selected

INTernal

selects

the

vertical

or video

component

from

either

vertical

plug-in

compartment,

EXTernal

selects

the

signal

applied

the

EXT

HORIZ/TRIG

connector

and

LINE

selects

sample

the

mainframe

line

voltage

INTernal

signal

coupled

with

approximate

frequency

range

from

MHz

The

external

and

line

signals

are do

coupled

Input

impedance

for

the

external

input

about

kid

for

the

trigger

mode

and

for

external

horizontal

sweep

mode

Trigger

sensitivities

are

division of

internal

signal

(peak-to-peak)

and

volt

of signal

(peak-to-

peak)

external

signal for

NORM

mode

division

internal

signal

peak-to-peak

and

volt

external

signal for

SGL

SWP

mode

RESOLUTION

BANDWIDTH

SIGNAL

LEVEL

30 Hz

-128

dBm

300

-120

dBm

MAXIMUM

INPUT

POWER

LEVEL

kHz

-110

dBm

kHz

-100

dBm

-30

dBm

with

the

Attenuator

0 dB,

for

linear

MHz

-90

dBm

operation,

+30

dBm

with

the

Attenuator

MHz

-80

dBm

(+30

dBm

also

the

power

rating of

the

Attenuator

Specification-71-13

the

NORM

mode

the

sweep

will

automatically

recur

the

end

holdoff

time

a trigger signal

absent,

provide

baseline

the

crt

The

SGL

SWP

and

"start"

buttons

function

together

provide

single

sweep

each

time

the

"start"

button

pushed

VIDEO

OUTPUT

CONNECTOR

Provides 50

t5%

video

signal

per

display

division,

about

the

crt

vertical

center

Source

impedance

approximately

kit

maximum

offset

may

introduced by

the

error

from

the

mainframe

vertical

centering

interface

EXTERNAL

HORIZONTAL/TRIGGER

INPUT

CONNECTOR

Requires

0 V

V t1

V, to

sweep

the

full

frequency

span

Requires

volt

peak-to-peak

trigger

the

sweep

circuits

Maximum

safe input

;

volts

(dc

peak

ac)

ENVIRONMENTAL

CHARACTERISTICS

This instrument

will

meet

the

electrical

characteristics

over

the

environmental

limits

of the

7000-Series

main-

frame

Complete

details

test

procedures,

including

failure

criteria,

etc

can

obtained

from

Tektronix,

Inc

Contract

your

local

Tektronix

Field

Office

represen-

tative

ACCESSORIES

AND

OPTIONS

STANDARD

ACCESSORIES

Spectrum

Analyzer

Graticule

Clear

plastic

implo-

sion

shield

with

LOG,

LIN,

REF

and

(frequency)

direction

markings

Tektronix

Part

337-1439-01

for

7403N

oscilloscope

and

337-1159-02

for

other

7000-Series

os-

cilloscopes

attenuator

with

block

OPTIONS

7000-SERIES

OSCILLOSCOPES

CRT

with

P7 phosphor

and

time

domain

graticule

The

external graticule

for

spectrum

analysis

(part of

standard

accessories)

should

used

CRT

with

P7 phosphor and

internal

spectrum

analyzer

graticule

(designated

P7SA)

This

recommended

when

the

oscilloscope

mainframe

used

exclusively

with

spectrum

analyzer

systems

Filter

Light

Amber

378-0684-01

Coaxial

Cable,

012-0113-00

with

BNC

connectors,

foot

BNC

Male

Female

Adapter

103-0058-00

Manual

070-1673-00

OPTIONAL ACCESSORIES

Block

(for

applying

015-0221-00

signals

riding

on a

poten-

tial)

Maximum

potential

50VDC

minimum

loss

011-0112-00

Table of contents

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