Tektronix 7L5 User manual

•

ekt

ronix, Inc.

Box 500

Beave

on, Oregon

97077

07IH734-QO

TEKTRONI»

7L5

SPECTRUM

ANALYZER

OPERATORS

INSTRUCTION

MANUAL

Serial Number

Scam

tso

llr

ce~Op

- >

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WARRANTY

All

TEKTRONIX

Instruments

are

warranted

against

defective

materials

and

workmanship

lor

one

year

Any

questions

with

respect

the

warranty

should

taken

with

your

TEKTRONIX

Field

Engineeror

representative.

All requests

for

repairs and replacement parts

should

directed

the

TEKTRONIX

Field

Ottice

representative

you

"r .-rea.

This

w II assure

you

the tastest

possible

service. Please

Include

lhe

instrument

Type

Number

Part

Number

and

SeriaL

Number

with

all

requests

for

parts

service.

Speclflcalions and p Ice

change

privileges reserved.

@ 1976

Tektronix

Inc

Beaverton

Oregon

Printed

the

United

States

rica

All

rights

reserved.

Contents

this

publication

may

not

reproduced

any

form

without

permIssion

Tektronix,

Inc.

U.S.A.

and

foreign

Tektronix

products

covered

U.S.

and

foreign

patents

and

patents

pending

TEKTRONIX

is a

registered

trademark

Tektronix

Inc

Scans bvOutsource-Options =>

Section 1

Section 2

Section 3

\,--

TABLE OF

CONTENTS

General Information

Introduction

Description

Specification

Frequency Characteristics

Input

Characteristics

Amplitude

Characteristics

Sweep Characteristics

Output

Connectors

Environmental Characteristics

Physical Characteristics

Accessories and

Options

Installation

Initial Inspection

Installation

Repackaging

Operating Instructions

Introduction

Functional

Block

Description

Front

Panel

Controls

and

Connectors

Calibrating

the

7L5 to the

Ostilloscope

Mainframe

Operational

Checkout

(

Preliminary Preparation

Operational

Check

Readout Characters

Dynamic

Range

Accuracy

Reference Level

Accuracy

Input

Buffer

Residual (Incidental) FM

Residual Response

Sensitivity

Check

Resolution

Bandwidth

Accuracy,

Amplitude

Deviation and Shape Factor

Using the Analyzer

Impedance

Matching

Signal

Application

Edge Noise

Frequency

Measurement

Technique

Max Span Operation

Resolution and Resolution

Bandwidth

Digital Storage

Applications

for

Spectrum Analyzers

7L5 Operators

Page

1-1

1-2

1-3

1-4

2-1

3-1

3-3

3-7

3-8

3-10

3-11

3-12

3-13

3-14

3-15

1734-1

Fig. 1-1. 7L5 Spectrum Analyzer,

7lS

Operators

Arte

kMe

dia

Digitally signed by

ArtekMedia

DN:

cn=ArtekMedia,

o=ArtekMedia.com

, ou,

email=manuals@Ar

tekMedia.com,

c=US

Date: 2008.11.30

22:27:01 -06'00'

L--

Section

1-7L5

Operators

SPECIFICATION

Introduction

effectively use the 7L5 Spectrum Analyzer, the

operation and capabilities

the

instrument

must be

known.

This

instruction

manual covers general operating

information

about

the instrument. Service information,

such as

circuit

description

and

calibration

are contained

in the Service manual.

Description

The 7L5 is a 5 MHz

spectrum

analyzer

with

digital

storage. Frequency

stability

within

Hz/hr

and center

frequency (dot) can be read

with

six

digit

accuracy

immediately

after

turn-on.

Thereis no need to

fine

tunethe

display.

Complex

measurements and analysis can be

made

with

relativeease.

Built-in

micro-processing

circuits

decode

control

settings, process

frequency

and reference

level information, and

optimize

sweep time and resolution

for

the selected

frequency

span.

The 7L5 with 80

spurious

free

dynamic

range, provides the

ability

to measure

wide

relative

amplitudes.

Nanovolt

sensitivity provides very low-level

signal and noise measurements.

The

7L5

display

fully

calibrated in

dBm,

dBV,

volts/div.

The

reference level can be accuratelyset to 1

increments. A

front

panel

input

buffer

control

increases

front-end

immunity

intermodulation

distortion

while

maintaining

constant

reference level.

accommodate

a wide variety

impedance sources, the 7L5 uses

quick

disconnect

plug-in

input

impedance modules

750,

6000,

1 MO/28 pF and customized units

meet

special requirements.

Digital

storage allows

any

7000-Series mainframe,

with

crt

readout, to present clean, easy to

photograph,

dis-

plays. A

smooth

integrated

display

provides an accurate

analysis

most displays.

Two

complete

displays can be

held in memory

for

comparison.

Two

modes select

either

the

conventional peak

display

digitally

averaged

display.

ElECTR

ICAl

CHARACTER

ISTICS

The

following

electrical characterstics

apply

when the

7L5

Spectrum

Analyzer, in

combination

with

a Plug-In

Module, are

normally

installed in a 7000-Series os-

cilloscope

and

after

warm-up

ten

minutes

more.

Frequency Characteristics

Range

Input

Frequency: 10 Hz

through

5.0 MHz.

Dot

Frequency: 0 Hz

through

4999.75 kHz.

Accuracy

20°C

30°C:

±(5

Hz + 2 X 10-6

dot

readout).

O°C to

50°C:

±(20

Hz + 10-5

dot

readout).

Drift

Hz/hour

less.

Residual (Incidental)

Hz/div

2 kHz/div: 1 Hz (p-p)

less.

kHz/div

to 500 kHz/div: 40 Hz (p-p)

less.

Resolution

Bandwidth

Accuracy

kHz-30

Hz:

Within

20%

selected resolution

down).

10 Hz: Within 100 Hz

±20

Hz (70

down).

The

COUPLED

setting

electronically

selects

the best resolution

bandwidth

for

each setting

the FREQUENCY

SPAN/DIV

control.

Shape Factor

kHz-3

kHz:

5:1

better

(60:6

ratio).

kHz-10

Hz:

10:1

better (60:6

ratio).

Amplitude

Deviation

kHz-100

Hz: 0.5

less.

kHz-10

Hz: 2.0

less.

1-1

Specification-7L5

Operators

Input Characteristics

The

application

voltage to the

INPUT

the

Plug-In

Modules

may

cause

permanent

damage to the

mixer

circuit.

Input

Impedance

(Nominal):

500

750

L3 Selectable

(500,6000,

and 1

MO/28

pF).

Input

Power

(maximum

input

level

for

reference

levels

dBm

greater):

dBm

2.5 V rms

dBm

3.07 V rms

dBm-input

terminated

500

6000;

100 V (peak ac +

dc)

input

MO/28

pF.

Input

Power

(maximum

input

level

for

reference

levels

below

dBm):

+10

dBm

+10

dBm

+10

dBm-input

terminated

500

600

and 100 V (peak ac +

dc)

with

input

MO/28

pF.

Amplitude Characteristics

NOTE

digital

storage

used,

additional

quantization

error

0.5%

full

screen

should

added

to the

amplitude

characteristics.

Residual Response

Internally

generated

spurious

signals are

-130

dBm

less referred

the

input

(harmonics

the

calibrator

are

-125

dB)

with

plug-in

module

and

-143

dBV

with

the

plug-in

module.

Sensitivity

The

following

tabulation

equivalent

input

noise

for

each

resolution

bandwidth

measured

with;

the

INPUT

BUFFER off,

the

VIDEO

PEAK/AVG

max

cw,

and

the

TIME/DIV

set

10 seconds.

1-2

Equivalent Input Noise

Resolution (equal

better than)

Bandwidth

-135

dBm

-135

dBm

-148

dBV

-133

dBm

-133

dBm

-146

dBV

100

-130

dBm

-130

dBm

-143

dBV

300

-125

dBm

-125

dBm

-138

dBV

1 kHz

-120

dBm

-120

dBm

-133

dBV

3 kHz

-115

dBm

-115

dBm

-128

dBV

kHz

-110

dBm

-110

dBm

-123

dBV

kHz

-105

dBm

-105

dBm

-118

dBV

NOTE

Sensitivity

degraded

additional

when

the

INPUT

BUFFER

on;

e.g.,

3 kHz, the

equivalent

input

noise

would

-107

dBm

instead

-115

dBm.

Noise

level

will

increase

ap-

proximately

when

operation

in video

peak

mode.

Intermodulation

Distortion

Intermodulation

products

from

two

on-screen

signals,

within

any

frequency

span are

?75

down

for

third

order

products

and

least 72

down

for

second

order

products.

Second

and

third

order

intermodulation

products

from

two

on-screen

-53

dBV

less

signals

within

any

frequency

span are

least 80

down.

With

the

INPUT

BUFFER

switch

on,

the

second

and

third

order

intermodulation

products,

for

any

two

on-

screen signals,

within

any

frequency

span, are

least

down.

Display

Flatness

Peak

peak

deviation,

over

any

selected

frequency

span:

Quantization

error

must

be added (see

Note

under

Amplitude

Characteristics)

digital

storage

used.

L1 0.5

dB;

L2 0.5

dB;

L3 0.5

Reference Level

Refers

top

graticule

line

Log

mode. Calibrated

in 1

and 10

steps

for

the L1

and

modules

and

dB/2

and 10

for

plug-in

module.

Scans

Ollisource-Optiolls

Range

Log

-128

dBm

-128

dBm/

-128

dBm

dB/Div

+21

dBm

139

dBV

+21

dBm

(500),

+21

dBm/

-139

dBm

+10

dBV

+10dBm

(6000),

-141

dBV

(Hi Z)

Log

-70

dBm

-70

dBm/

-70

dBm

dB/Div

+21

dBm

-81

dBV

+21

dBm

(500),

+21

dBm/

-81

dBm

+10

dBV

+10dBm

(6000),

-83

dBV

(Hi Z)

Incremental

Accuracy

When

calibrated

-40

dBV

in Log mode.

L2 and L3: Within 0.2

dB/dB

with

cumulative

error

0.25

dB/10

dB.

Lin

Mode

Range: 20

nV/Divt0200

mV/Divwithin

in 1-2-5 sequence.

NOTE

>sign

displayed

adjacent

to the reference

level

readout

when the reference level is

not

calibrated

due to an

incompatible

selection

controls.

Display

Dynamic

Range/Accuracy

Log 10

dB/DIV

Mode:

Dynamic

window

is 80 dB.

Accuracy

within

0.05

dB/dB

maximum.

Log

dB/DIV

Mode:

Dynamic

window

is 16 dB.

Accuracy

within

0.1

dB/dB

maximum.

Sweep Characteristics

Frequency

Span

Provides

calibrated

frequency

spans

from

Hz/div

max

(500

kHz/div),

within

4%,

in 1-2-5 sequence.

Horizontal

linearity

within

over

the

entire

div

display.

A O-Hz/Div

position

provided

for

time

domain

operation.

Specification-7L5

Operators

Sweep Rate

Time

per div

selectable

from

s/Div

0.1

ms/Div

in 1-2-5 sequence. An

AUTO

position

permits

automatic

selection

optimu

time/d

for

the

selected

resolution

and

span/div

settings.

Sweep rate

accuracy

within

the

rate

selected.

Triggering

Provides

two

triggering

sources,

INT

(internal)

and

LINE, in

addition

to a FREE-RUN

position.

When

INT

selected, ac

coupled

signal

com-

ponents

from

the

mainframe

Trigger

Source

(left

right

vertical

amplifiers)

are used.

When

LINE

selected, ac

coupled

sample

mainframe

line

voltage

used.

Three

triggering

modes

are;

NORM

(normal),

SGL

SWP/READY

(single sweep), and

MNL

SWEEP

(manual sweep).

Trigger

level is

~1.0

div

internal

signal

for

both

NORM

and

SGL

SWP

modes

over

the

approximate

frequency

range

30 Hz

500 kHz.

Output Connectors

Video

Out

Front-panel

jack

connector

supplies

the video

(vertical)

output

signal

amplitude

mV/div

±5%

(about

the

crt

vertical

center)

with

source

im-

pedance

1 kO.

Horiz

Out

front-panel

jack

connectorsupplies

horizontal

output

signal

(negative-going

sawtooth

that

varies

from

0.0 V

approximately

-6

with

source

impedance

5 kO.

Calibrator

Front

panel

BNC

connector

supplies

calibrated

500 kHz squarewave

output

signal

(derived

from

the

analyzer's

time

base).

Output

amplitude

within

±0.15

-40

dBV

into

impedance

the

plug-in

rT'_

.....

III.o.

1-3

Scans

Ollisollrce-Options

Specification-7L5

Operators

ENVIRONMENTAL

CHARACTERISTICS

The

7L5

Spectrum

Analyzer

will

meet

the

foregoing

electrical

characteristics

within

the

environmental

limits

a 7000-Series

oscilloscope.

Complete

details

en-

vironmental

test

procedures

including

failure

criteria

etc.,

can

be"obtained

from

a local

Tektronix

Field

Office

representative.

PHYSICAL

CHARACTERISTICS

Net

weight

(instrument

only):

pounds,

12 ounces.

ACCESSORIES

AND

OPTIONS

Standard Accessories

Graticule,

Spectrum

Analyzer

Filter,

light

amber

Manual,

Operating

Manual, Service

1-4

Tektronix Part No.

377-1159-02 (7000-Series)

378-0684-00

070-1734-00

070-2184-00

Optional Accessories

Plug-in

Module,

ohm

Plug-in

Module,

ohm

Plug-in

Module

500,6000&

MO/28

Probe

(10X)

Attenuator,

step,

ohm

Attenuator,

step,

ohm

P6105 (see L3

Manual)

2701

2703

OPTIONS

7L5

Option

21-(Log

Display)

7L5

Option

25-(Tracking

Generator)

7L5

Option

28-(Readout)

7L5

Option

30-(Option

21/25)

7L5

Option

31-(Option

21/28)

7L5

Option

32-(Option

25/28)

7L5

Option

33-(Options

21/25/28)

Scans

Oulsource-Optiolls

[

Section

2-7L5

Operators

INSTALLATION

Initial Inspection

This

instrument

was inspected

both

mechanically

and

electrically before shipment. It

should

be free

mars

scratches and

electrically

meet

exceed all

specifications. Inspect the

instrument

for

physical

damage and

check

the electrical

performance

the

Operational

Check

procedure

provided

within

these

in-

structions.

This

procedure

will

verify

that

the

instrument

operating

correctly

and it

will

satisfy

most

receiving

incoming

inspection requirements.

all

instrument

specifications are

be verified, refer

the Service

Instructions

for

the 7L5.

If there is physical damage

performance

deficiency,

contact

your

local

Tektronix

Field

Office

represen-

tative.

Installation

install the7L5, align the

upper

and

lower

guide

rails

with

those in the receiving

compartments

the

main-

frame. Slide the

instrument

along the rails

into

the

mainframe. When the electrical

connectors

at the rear

the 7L5 make contact,

apply

firm, steady pressure to the

front

panel until the rear

connectors

are engaged and the

front

panel is

approximately

flush

with

the

oscilloscope

front

panel.

remove the 7L5, pull the release latch

labeled 7L5,

the

lower

leftofthe

front

panel, and remove

the instrument.

REPACKAGING FOR

SHIPMENT

your

Tektronix

instrument

is to be shipped

Tektronix

Service

Center

for

service

replacement,

attach a tag

showing;

owner

(with address) and the name

an individual,

your

firm,

that

can be contacted.

Include

complete

instrument

serial

number

and

descrip-

tion

the service required.

Save and re-use the

container

your

instrument

was

shipped in. If the

original

packaging is

not

available

unfit

for

use, repackage as follows:

Obtain a

shipping

container

heavy corrugated

cardboard

wood

with

inside

dimensions

six inches

greater than the

instrument

dimensions.

This

will

allow

room

for

cushioning.

Refer

Table

2-1

for

carton

test

strength

requirements.

Wrap the

instrument

in heavy paper

polyethylene

sheeting

protect

the

instrument

finish.

Protect

the

front

panel

with

urethane f9am

cardboard

strips.

Cushion

the

instrument

on all sides

packing

dunnage

urethane foam between the

carton

and the

instrument,

allowing

three inches

all sides.

Seal the

shipping

carton

with

shipping

tape

industrial stapler.

TABLE

2-1

Gross

Weight

(Ib)

Carton

Test

Strength (Ib)

0-10

10-30

30-120

120-140

140-160

200

275

375

500

600

you

have

any

questions,

contact

your

local

Tektronix

Field

Office

representative.

2-1

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