Tektronix 492 Instruction Manual

COMMITTED TO EXCELLENCE

Tektronix, Inc.

P.O. BOX 500
Beaverton, Oregon 97077

Serial Number

-,“,“1 ,.,,,..,,.

Firs1 Printing JULY 1479

F,RGM TEKTPCJNIX,

- -

. . .--...

INC. FSD

__.-*. . .

6. 25. 1991

13: 49

p. 2

TEK 1 INTI~OFFICE

TO

FnOM

SU13.K:T

John Martin

Frank

GfDEP permit request

Gray, SO-PAT

In

reeponse to the request to grant perrniasion to

Government Industry Exchange

Tektronix
Tektronix,

of

such documents to any

in the Metrology

operator,

Xnc. hereby

Data Interchange Data Base of
that all copies of the original work
copyright notice and

in the original, together

permit3eionaa

This permission has been approved by the Intellectual

lropsrt Committea OF Tsktronbc,

be prov

ded

‘i

to GIDEP to provide the requested permission.

COMMUNICATION .

94-540

Pro ram

~lervice and

grants such pm-mission

GIDEP

ownership

with

P

nstruction manuals,

user that is a full participant

statement exactly a-& it appears
the Legend "Reproduded with

and a copy or this memo may

(CPDEI?) to reproduce

include the entire

. . .

>n ' t:

Juno 25, 1991

for distribution

GIDEP provided

.

the

geG&d-a

Group Pa&t: Counml

492 operators

TABLE OF CONTENTS

LISTOFILLUSTRATIONS ............................................... iv

LISTOFTABLES

OPERATOR’SSAFETYSUMMARY ......................................... Y

SERVICE SAFETYSUMMARY

SECTION 1 GENERAL INFORMATION AND SPECIFICATIONS

...................................................... iv

.............................................

GENERAL INFORMATION .......................

INTRODUCTION ............................

STANDARDS, DOCUMENTS, AN0 REFERENCES USED

CHANGE AND HISTORY INFORMATION ..........

PRODUCT DESCRIPTION .....................

SPECIFICATION ..............................

ELECTRICAL CHARACTERISTICS ...............

Frequency Related .........................

Amplitude Related ..............

Input Signal Characteristics .......

Output Signal Characteristics ......

General Characteristics ..........

Power Requirements ............

ENVIRONMENTAL CHARACTERISTICS

PHYSICAL CHARACTERISTICS ......

ACCESSORIES ....................

OPTIONS ........................

,- Option 1 .......................

I Option 2 .......................

, ... Option 3 .......................

Option fJ .......................

Option 20 ......................

/,Option 21 ......................

Option 22 ......................

Options for Power Cord Configuration

vii

l-l
l-l
l-l
l-l
1-I
1-2
1-2
1-2
1-5
1-7
l-8
l-8
l-8
1-9
i-10
I-IO
1-12
1-12
1-14
1-14
l-15
l-16
l-16
l-16
i-17

SECTION 2 INSTALLATION INSTRUCTIONS

INTRODUCTION .........................

UNPACKING AND INITIAL INSPECTION ........

PREPARATION FOR USE ...................

POWER SOURCE AND POWER REQUIREMENTS

REPACKAGING FOR SHIPMENT .............

TABLE OF CONTENTS (cord)

SECTION 3

OPERATION
CONTROLS, INDICATORS, AND CONNECTORS.,

TURN-ON AND PREPARATION FOR USE

1. Initial Turn On

2. Calibrate Center Frequency Readout

3. Calibrate Reference Level and Dynamic Range.

4. Check Span Accuracy and Linearity

FUNCTIONAL OR OPERATIONAL CHECli

1. Check Operation of Front Panel Pushbuttons and Controls

2. Check Frequency Readout Accuracy

3. Check Frequency SpanlDiv Range and Accuracy

4. Check Resolution Bandwidth and Shape Factor

5. Check Reference Level Gain and RF Attenuator Steps

6. Check Sensitivity

7. Check Frequency Drift or Stability,

6. Check Residual FM

9. Digital Storage (Option 2)

GENERAL OPERATING INFORMATION

Crl Light Filters

Intensity Level, Focus. and Beam Alignment

Signal Application

RF INPUT Connector

Amplitude Conversion

Connecting to 75 n Source,
Resolution Bandwidth, Frequency Span, and Sweep Time
Using the Peaking Control
Using the Signal Identifier.
Using the Video Filters
Time Domain Operation
Triggering the Display

Sweeping the Display
Manual Scan of the Spectrum
Reference Level, RF Attenuation, and Vertical Display

Delta A Mode,

Min Noise/Min Distortion

Digital Storage (Option 2)

Waveguide Mixers and External Diplexer

Handling ..........................................

Installation
Operation
Analyzing Signals.

...................................... 3-7

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..................................... 3-18

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................................ 3-23

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......................................... 3-24

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...................... 3-6

...................... 3-8

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....................... 3-16

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...... 3-9

......... 3-13

......... 3-19

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Page

3-l

3-7

3-0

3-9

3-11
3-12
3-13

3-14

3-17
3-17

3-18
3-18

3-18

3-18

3-19
3-19

3-20
3-21
3-21
3-21

3-21
3-22

3-22
3-22
3-22

3-23
3-24

3-24

3-25
3-26

TABLE OF CONTENTS (cant)

492 Operators

SECTION 3

I

I

I

1

I

I

SECTION 4 OPTION INFORMATION. ..................................

APPENDIX A

CHANGE INFORMATION

OPERATION (COW)
OPERATIONAL PRECAUTIONS

1. Measurements Outside the Specified Frequency and Tuning Range

Versus Span of the Display

Signal FM ........................................

2.

Correct Trigger Mode. ...............................

3.

4. Level of Pulsed Signals,

5. Level of Continuous Wave Signals

6. Excessive Input Signal Level

No Crt Trace ......................................

7.

Digital Storage Effects on Signal Analyses

8.

9. Stored Display Averaged in Wide Spans

IO. Cold Storage or Power Interrupt Initialization
SERVICE MANUALS
PRODUCTSERVICE

GLOSSARY..

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.............................

..............................

.............................. 3-26

.......................

........................... 3-27

................. 3-27

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Page
3-26

3-26
3-26
3-26

3-27

3-27

3-27
3-27
3-28
3-28

4-1

A-I

492 Operators

LIST OF ILLUSTRATIONS

Page

3-12
3-13
3-14
3-15

Dimensions
International power and plug configuration for the 492
Front panel selectors, controls, and connectors
Rear panel connectors
Crt readout for power-up state

Typical display of calibrator markers in MAX SPAN position

Displays that illustrate how bandwidth and shape factor are determined

Typical display using digital storage with MAX HOLD activated, to measure drift

Displays to illustrate how residual FM is measured
Using digital storage to measure the differential between two events
Volts-dBm-Watts conversion chart for 50 Sk impedance
Circuit of a 75 n to 50 n matching pad (ac coupled)
Graph to illustrate the relationship between dBm, dBmV. and dB@

(matching attenuator included where neCe$$ary)
Integrating the display with the Video Filter
External (Waveguide) mixer installation

Typical display generat,ed by a signal into the waveguide mixer

Identifier mode displays

.................................................

..................

............ .' ..........

.........................................

...................................

..............

......

.....................

........

..................

....................

.......................

..........................

.............................

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........................................

l-10
1-17
3-1
3-6
3-7
3-7
3-13
3-16
3-17
3-16
3-19
3-20

3-20
3-21
3-24
3-25
3-26

iv

Table

1-1
1-2
1-3
1-4
l-6
2-1
3-l

3-2
3-3
3-4

LIST OF TABLES

Frequency Response and Flatness

Sensitivity versus Bandwidth ........................

Accessories
Option 1 Frequency Characteristics

Option 1 Sensitivity ..............................

Shipping Carton Test Strength ......................

Span/Div Ranges versus Band and Option

Narrow and Wide Spans verauS Frequency Band ..........

Sensitivity without Preselector .......................

Sensitivity Option 1 ..............................

....................................

....................

...................

..............

.........

......... 1-6

......... l-10

......... 1-12

......... I-13

......... 2-2

......... 3-3

......... 3-12

......... 3-15

......... 3-16

l-4

I

m

I

OPERATORS SAFETY SUMMARY

The general safety information in this part of the summary is for both operating and servicing
personnel. Specific warnings and cautions will be found throughout the manual where they
apply. but may not appear in this summary.

TERMS

In This Manual
CAUTION statements identify conditions or practices that could result in damage to the

equipment or other property.

WARNING statements identify conditions or practices that could result in personal injury or

loss of life

As Marked on Equipment
CAUTION indicates a personal injury hazard not immediately accessible as one reads the

marking, or a hazard to property including the equipment itself.

DANGERindicatesapersonalinjuryhazardimmediatelyaccessiblaasonereadsthemarking.

SYMBOLS

In This Manual

indicates where applicable cautionary or other information is to be

As Marked on Equipment

f DANGER - High voltage.

-L Protective ground (earth) terminal.

0

A

Power Source

Thisproductisintendedtooperatefromapowersourcethatwill notapplymorethan250vOltS

rms between the supply conductors or between either supply conductor and ground. A
protective ground connection by way of the grounding conductor in the power cord is

essential for safe operation.

ATTENTION - refer to manual.

492 operators

Grounding the Product
This product is grounded through the grounding conductor of the power cord. To avoid

electrical shock, plugthepowercordintoaproperlywired receptacle beforeconnectingtothe
product input or output terminals. A protective ground connection by way of the grounding
conductor in the power cord is essential for safe operation.

Danger From Loss of Ground
Upon loss of the protective-ground connection, all accessible conductive parts (including

knobs and controls that may appear to be insulating) can render an electric shock.

Use the Proper Power Cord
Use only the power cord and connector specified for your product.

Use only a power cord that is in good condition.

For detailed information on power cords and connectors, see Fig. 1-2.

Refer cord and connector changes to qualified service personnel.

Use the Proper Fuse
To avoid fire hazard, use only the fuse of correct type, voltage rating and current rating as

specified in the parts list for your product.

Refer fuse replacement to qualified service personnel.

Do Not Operate in Explosive Atmospheres

To avoid explosion, do not operatethis product in an explosive atmosphere unless it has been

specifically certified for such operation.

Do Not Remove Covers or Panels

To avoid personal injury, do not remove the product covers or panels. Do not operate the

product without the covers and panels properly installed.

492 operators

SERVICE SAFETY SUMMARY

FOR QUALIFIED SERVICE PERSONNEL ONLY

Reter also to the preceding Operators Safety Summary.

Do Not Service Alone
DO not perform internal serviceoradjustment of this product unlessanother person capableof

rendering first aid and resuscitation is present.

Use Care When Servicing With Power On
Dangerous voltages exist at several points in this product. To avoid personal injury, do not

touch exposed connections and components while power is on.

Disconnect power before removing protective panels, soldering, or replacing components.

Power source

Thisproductisintendedtooperatefromapowersourcethatwill notapplymorethan250volts
rms between the supply conductors or between either supply conductor and ground. A

protective ground connection by way of the grounding conductor in the power cord is

essential for safe operation.

, DEC 1979

vii

492 operators

Viii

REV A DEC ,979

I

II

GENE,RAL INFORMATION AND

SPECIFICATION

GENERAL INFORMATION

This manual contains information pertinent to the
installation and operation of tha 492 Spectrum Analyzer.
Contents and organization of the manual are descri bed in
the Table of Contents preceding this section. These
instructionsassumetheuserisknowledgeableinfrequen­cy domain analysis. The intent is to provide information
necessary to effectively operate the 492. Service informa-

tion is in a separate service manual

Sectfon l-492 operators

Product Description

The 492 Spectrum Analyzer is a high performance,

compact, portable spectrum analyzer that displays&

Solute amplitude and frequency information of signals

m the frequency spectrum of 50 kHz to 21 GHz with

the internal coaxial mixer, and up tm .r..­external TEKTRONIX High Performance Waveguide Mix­ers. The 8.4 X 10.2 cm crt face reads out all major display

parameters.

Withinnat

R

Standards, Documents, and References Used

Terminology used in the manual is in accordance with
industry practice. Abbreviations are in accorrlnnw with
ANSI Yl.l-1972. with exceptions and addition ,I .,

parentheses after theabbreviation. Graphicsymbology
IS based on ANSI Y32.2.1975. Loqic symboloay is based
on ANSI Y32.14.1973 and the ma~ufa&rer’s data books
or sheets. Acopyof ANSI standardsmay beobtainedfrom
the Institute of Electrical and Electronic Engineers, 345
47th Street, New York. NY 10017.

Change and History Information

Change information that involves manual corrections
and/or additional data is located at the back of themanual
in the CHANGE INFORMATION section.

History information with the updated data isintegrated
into the text or diagrams when a page or diagram is
updated.

1s exolainad

Some features of the 492 are: Simplified operation

through the use of an internal microcomputer. Display

dynamic range of 80 dB with calibrated reference level
readout from -123 dBm to f30 dBm. in 10 dB and 1 dB
steps. When using the Delta A mode, to measure the
amplitude difference between two signals. the steps are

0.25 dB. Resolution bandwidths from 1 kHz to 1 MHz in
decade steps, with a Shape factor of 7.5:1 or better

(options provide additional bandwidth selections of

100 Hz). Intermodulation products are: 70 d0 or more

down, harmonic distortion is -70 dBc or better. Sensitivi-

tyof-115 dBmto7.1 GHz,atl kHzresolutionbandwidth.

Frequencyresponseoff1.5 dBto7.1 GHzandk2.5 dBto

18 GHz. Digital storage (with Option 2) features peak

detection and digital signal averaging.