Tektronix L3 Manual de usuario

Tektronix,

Inc.

P.O. Box 500

Beaverton, Oregon 97077

070-2154-02

I~ktronoo

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PLEASE CHECK FOR CHANGE

INFORMATION

THE REAR

OF THIS MANUAL.

INSTRUCTION

MANUAL

First Printing SEP 1976

Serial

Number

-----

Revised MAY

1981

Scans

ARTEK

MEDIA

1976,1977,1978

Tektronix, Inc. All

rights reserved.

Contents

this

publication

may

not be

reproduced

any

form

without

the

written

permission of Tektronix, Inc.

Products

Tektronix, I

nco

and its subsidiaries

are covered by U.S. and

foreign

patents

and/or

pending patents.

TEKTRONIX, TEK, SCOPE-MOBILE, and

are registered trademarks

Tektronix, Inc.

TELEQUIPMENT is a registered

trademark

Tektronix

U.K. Limited.

Printed in U.S.A.

Specification

and price change

privileges are reserved.

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TABLE OF

CONTENTS

...

Section 1 GENERAL

INFORMATION

Section 3 PERFORMANCE

CHECK

DESCRIPTION 1-1

INTRODUCTION

3-1

ELECTRICAL

CHARACTERISTICS

1-1

eQUIPMENT

REQUIRED 3-2

ENVIRONMENTAL

PROCEDURE

3-3

CHARACTERISTICS

1-4 Section 4 SERVICE

INFORMATION

DIAGRAM

Section 2

OPERATING

INSTRUCTIONS

INTRODUCTION

4-1

INTRODUCTION

2-1

CALIBRATION

PROCEDURE 4-2

INST

ALLA

TION

2-1

CIRCUIT

DESCRIPTION 4-6

FRONT

PANEL

CONTROLS

COMPONENT

LOCATIONS

4-9

AND

CONNECTOR

2-1

SCHEMATIC

DIAGRAM

4-13

INITIAL

CALIBRATION

2-2

INPUT

IMPEDANCE

CHANGE

USING

THE

ANALYZER 2-3 PROCEDURE 4-18

Impedance

Matching

2-3 Section 5 REPLACEABLE PARTS

LISTS

5-1

Signal

Amplitude

2-3 Accessories 5-18

USING

THE L3

OPTION

WITH

BALANCED

Section 6

OPTIONS

CONNECTIONS

2-4 L3

Option

1 6-1

REV. B

APR

1978

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GENERAL

INFORMATION

DESCRIPTION

The L3 Plug-In Moduleis one

aseries

modulesthat

are used with

the

Tektronix

7L5 Spectrum Analyzer to

provide

with various

front

end capabilities. The L3 has a

switch-selectable

input

termination:

500,6000,

ahigh

impedance

MO/28 pF) probe compatible input.

Options

for

the L3 are described in the Optionssection.

ELECTRICAL CHARACTERISTICS

The

following

electrical characteristics applywhen the

L3 Plug-In Module, in

combination

with a 7L5 Spectrum

Analyzer, is installed in a 7000-Series oscilloscope, and

has had a

warm-up

period

ten minutes

more.

Intermodulation

Distortion

With

two

on-screen signals

within

any frequency span

and

any amplitudes,

intermodulation

distortion

least 75

down

for

third-order

products

and at least

down

for

second-order

products.

With two on-screen signals and reference levels

-53

less, intermodulation

distortion

is at least80

down.

With two

out-of-band

(>5

MHz) signals equal

less

than the reference level, second-order intermodulation

products

are at least 50

down.

With the INPUT BUFFER switch on, second- and

third-

order

intermodulation

products

for

any

two

on-screen

signals

within

anyfrequency span are

least80 dB down.

Sensitivity

The

following

tabulation

input

noise

for

each

resolution bandwidth is measured with: 1)

L3 Plug-In

Module installed;

the INPUTBUFFER off;

theVIDEO

PEAKIVIDEO AVERAGE

control

at maximum clockwise

position; 4) the

TIME/DIV

control

set at 10

DIGITAL

STORAGE DISPLAY A and

Bon;

6) the

input

impedance

switch

REV. A, OCT.1977

Section

1-L3

1-1

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Resolution Bandwidth

10 Hz

30 Hz

100 Hz

300

1 kHz

3 kHz

10 kHz

30 kHz

Equivalent Input Noise

(equal

less

than)

-148

dBV

-146

dBV

-143

dBV

-138

dBV

-133

dBV

-128

dBV

-123

dBV

-118dBV

NOTE

Sensitivity

degraded

additional

when the

INPUT

BUFFER

(illuminated):

e.g.,

3 kHz,

the

equivalent

noise

would

-120

dBV

instead

-128

dBV. Norse level

will

increase

approxi-

mately

when

operation

is in the Video Peak

mode.

Range

MODE

50n

LOG 2

dB/DIV

-128

dBm

+21

dBm

LOG 10

dB/DIV

-70

dBm

+21

dBm

Residual Response

Internally

generated

spurious

signals

are

-143

dBV

less (referred

the

input),

-138

dBV

less

for

calibrator

harmonics.

Display Flatness

Maximum

peak-to-peak

amplitude

variation

is 0.5

from

5 MHz,

0.75

from

20 Hz

5 MHz,

plus

quantization

error

digital

storage

is used (see 7L5

specifications)

Reference Level

In the log mode, reference level refers

the

top

horizontal

graticule

line and

calibrated

in 1

and

steps.

600n

High Z

-139

dBm

+10

dBm

-141

dBV

-81

dBm

+10

dBm

-83

dBV

1-2

General

Information-L3

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With

operation

in LIN mode, reference level

calibration

range is from 20

nV/div

200

mV/div,

within

5%,

in a 1-2-5

sequence. A variable reference level

control,

VAR, can be

used

increase the

display

amplitude

dB.

NOTE

A >

sign

displayed

adjacent

to the reference level

readout

when

the reference level is

not

calibrated

due to an

incompatible

selection

the REFERENCE

LEVEL,

FREQUENCY

SPAN/DIV,

and

TlME/DIV

controls.

Incremental Accuracy

Within

0.2

for

any

change

reference level,

with

cumulative

error

0.25

for

any

change

dB.

Within

0.25

dB/10

dBforanychangeof10

dBormore.

Input Connector

The

INPUT

connector

is a

three-conductor

bnc

con-

nector

with

the

outer

ring used

detect

the presence

10X

probe

that

the reference level readout is changed

10X

(+20

dB).

NOTE

Readout

changes

factor

only

10X

a 100X

probe

connected.

Input

Impedance:

Switch

selectable; 1 MO in parallel

with

pF, 50 0

termination,

600 0

termination.

Maximum Input Levels

MO/28

pF: 15 V

pop

for

pulse signals

with

risetimes

2 V//-ls

faster (pulses

beyond

this

specification

may

open an

input

fuse).

@ General

Information-L3

1-3

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40 V

(dc

plus ac)

for

signals

with

risetimes slowerthan

2 VI

f.1S.

600 n

(internally

terminated):

12 V

rms

(+24

dBm).

(internally

terminated):3.5 V

rms

(+24

dBm).

ENVIRONMENTAL CHARACTERISTICS

The

L3 Plug-In

Module

will

meet

the

foregoing

elec-

trical characteristics

when

installed in a 7L5

Spectrum

Analyzer

within

the

environmental

limits

a 7000-Series

oscilloscope.

Complete

details on

environmental

test

procedures

including

failure

criteria

etc., can be

obtained

from

your

local

Tektronix

Field

Office

representative.

1-4 General

Information-L3

REV

A NOV 1980

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OPERATING

INSTRUCTIONS

INTRODUCTION

This

section

the manual

contains

installation

instruc-

tions

for

the L3

plug-in,

describes the

function

its

front

panel

controls

and connectors, and

includes

general

operating information suchas initial

calibration

and signal

application.

INSTALLATION

Visually inspect the 7L5

plug-in

cavity

verify the

absence

any

obstruction

such as misplaced internal

cables

packing materials such

cardboard

styrofoam.

Carefully

inspect

the L3

module

ensure

that

the

cover

plate is

properly

fastened

with

protruding

screw heads.

Never

install

the L3

Plug-In

Module

without

its

cover

plate. The

metal

grounding

fingers

within

the 7L5

cavity

will

catch

and

severely

damaged

when

the

plug-in

is removed.

Align

the L3

module

front

the 7L5

plug-in

aperature with its edge card

connector

the rearand the

dBV/dBm

switch

tothe

right. Carefullyslidethe L3

into

the

7L5

plug-in

cavity and

apply

a steady pressure to the L3

front

panel until its rear

connector

firmly

seated and its

front

panel is

approximately

flush

with

the7L5

front

panel.

FRONT PANEL

CONTROLS

AND

CONNECTOR

AMPL CAL

The

AMPL

CAL

control

is a

potentiometer

that

adjusted

during

theOperational

Check

tocalibrate the full

screen reference level.

This

control

is used tocompensate

for

gain differences in the

and

portions

the

instrument. The

AMPL

CAL

control

should be adjusted

checked

for

proper

setting each time the L3 Plug-In

Module

is installed in a 7L5. (Refer to Initial Calibration

Section,

which

follows.)

INPUT

TERMN Z

This three-position

switch

selects

input

termination

600

the unterminated

input

1 MO in parallel

with

28 pF.

REV. A APR.1978

Section

2-L3

2-1

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