Tektronix 492 Service manual

Tektronix , Inc.
P.O.
Box 500
Beaverton ,
Oregon
97077
070-2729-00
Tektronix
COMMITTED TO
EXCELLENCE
Serial
Number
492
OPERATORS
HANDBOOK
First Printing MAR 1980

WARRANTY
Tektronix warrants that this product is free from defects in materials and workmanship . The
warranty period is one ( 1 ) year from the date of shipment . Tektronix will , at its option , repair or
replace the product if Tektronix determines it is defective within the warranty period and if it is
returned ,
freight prepaid ,
to a
service center
designated by
Tektronix .
Tektronix is not obligated to furnish service under this warranty
a . to repair damage resulting from attempts by personnel other than Tektronix
representatives
to install
, repair , or
service the
product ;
b . to repair damage resulting from improper use or from connecting the product to
incompatible equipment ;
c
. if
personnel other than
Tektronix
representatives
modify
the
hardware
or software .
There is no implied warranty of fitness for a particular purpose . Tektronix is not liable for
consequential
damages
.
Copyright © 1980 Tektronix , Inc. All rights reserved . Contents of this publication
may not be reproduced in any form without the written permission of Tektronix , Inc.
Products of Tektronix , Inc. and its subsidiaries are covered by U.S. and foreign
patents and / or pending patents .
TEKTRONIX
, TEK ,
SCOPE -
MOBILE , and
Tektronix ,
Inc.
Printed in U.S.A. Specification and price change privileges are reserved .
TEKTRONIK
are
registered
trademarks
of

Section 1
Section 2
DESCRIPTION AND
SPECIFICATION
TABLE OF CONTENTS
PRODUCT DESCRIPTION
Specification
Summary
OPERATION
PREPARATION FOR USE ..
Power Source and Power
Requirements ...
Controls , Connectors , and
Indicators
Initial Turn On .
Calibrate
Center
Frequency
Readout
Page
1-1
1-1
1-1
2-1
2-1
2-2
2-2
2-14
2-16
Calibrate Reference Level and
Dynamic Range .
2-16
Check Span Accuracy and Linearity 2-17
Section 3
492
Operator's
Handbook
GENERAL OPERATING
INFORMATION
Page
3-1
3-1
3-1
SIGNAL APPLICATION
RF
Input
Connector
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
3-6
Delta A Mode . . . .
3-7
MIN NOISE / MIN DISTORTION .. 3-8
Digital
Storage ( Option 02 ) ..
3-8
3-2
3-3
3-3
3-4
3-4
3-4
3-6
3-6
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 im
mediately accessible as one reads the marking , or a
hazard to property including the equipment itself .
ii
DANGER indicates a personal injury hazard immediately
accessible
as
one reads the
marking
.
In This Manual
SYMBOLS
This symbol indicates where applicable
cautionary
or
other
information
is to
be
found .
As
Marked on
Equipment
A
492
Operator's
Handbook
DANGER
-
High voltage .
Protective
ground ( earth )
terminal .
ATTENTION - refer to manual .
Power Source
This product is intended to operate from a power source
that will not apply more than 250 volts 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 .

Grounding the
Product
This
product
is
grounded
through
the
grounding conduc
tor of the
power
cord .
To avoid
electrical
shock
, plug the
power cord into a properly wired receptacle before
connecting to the product input or output terminals . A
protective ground
connection by way of the
grounding
conductor
in
the power
cord is
essential for safe opera
tion .
Danger
Arising
From
Loss of
Ground
Upon loss of the protective - ground connection , all
accessible conductive parts ( including knobs and con
trols 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
492 Service
Vol . 1 .
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 operate this 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
Operator's
Handbook
iii

iv
INTENTS
ܘܐ
ܘ
ܘ
ܘ
TROGERING
POOD
HANDY
112
TIME
DIV
MEFLENIE
VERT
PLAY
WATTES
saxl
RESOLUTION
BANDING
TH
Tektronix
FREQUENCY
(
)
ܐ
ܘ
1
Loc
FREQUENCY
-
RESOLUTION
SPANDIV
REFERENCE
MIN
RFATTEN 60
492
Spectrum
Analyzer .
492
ANALYZE
492 Operator's Handbook
*
1 ?
2729-1

SECTION
1
DESCRIPTION
AND
SPECIFICATION
PRODUCT
DESCRIPTION
The
492
Spectrum
Analyzer is a
high
performance ,
compact
, portable
spectrum
analyzer
that displays ab
solute
amplitude and
frequency
information
of
signals .
within
the
frequency spectrum
of 50 kHz to 21
GHz with
the
internal
coaxial mixer
, and up to
60 GHz with
optional
external
TEKTRONIX High
Performance
Waveguide Mix
ers . The 8.4 X 10.2 cm crt face reads out all major display
parameters
.
SPECIFICATION
SUMMARY
Complete
instrument
specifications
can be
found in the
492
Operator's
Manual .
These
specifications
apply
at
ambient
temperature
of
25 ° C after a 2 hour warm - up period .
492
Operator's
Handbook
1-1

Frequency Related Specifications
Center frequency range , RF INPUT
Center
frequency
readout
accuracy
Frequency
drift
Amplitude Related Specifications
Frequency response and sensitivity :
Frequency Range
100 kHz - 4.1 GHz
without option 01
1-2
100 kHz - 1.8
GHz
with
option
01
1.7-5.5 GHz
3.0 7.1 GHz
5.4-18.0 GHa
15.0-21.0 GHz
a
ª
derate 1 dB
for
option 01 .
badd
-10
dB
for
option 01 .
100 kHz - 18 GHz ( usable to 21 GHz )
Within ( 5 MHz + 20 % of span / div ) or within ( 0.2 % of the
center frequency + 20 % of the span / div ) , whichever is greater .
< = 200 kHz / hour
Frequency Response
within 1.5 dB
within 1.5 dB
within 1.5
dBª
within
1.5 dBª
within
2.5 dBª
within 3.5 dBª
492
Operator's
Handbook
Sensitivity 1
kHz
Bandwidth
-115 dBm
-110 dBm
-115
dBm
-115
dBmb
-100
dBmb
-95
dBmb

Signal
Level
Accuracy
:
Signal levels are measured after the instrument is calibrated to the 100 MHz calibrator signal . Sources of error in
signal level measurement are shown below and are worst case for 25 ° Celsius operation . The sources of errors that are
actually encountered will depend upon signal frequency , level , and measurement technique .
Calibrator
RF Attenuator
Flatness
Band
switching
Resolution
bandwidth
switching
IF
gain
Display
and
log
within 0.3 dB maximum
within 1.4 dB
maximum
typically
1
dB
greater than the
frequency
response
within 1 dB with internal mixer
within 0.5 dB maximum
within 2.0 dB
maximum
within 2.0 dB maximum
Spurious Response Specification
Residual
(
signals
present
with no
RF input )
Harmonics of
input
signal
Harmonic of
input
signal
with
option
01
,
1.7-18 GHz
-100 dBm referred to mixer input for fundamental mixing
60 dB
down
for
-30
dBm signal
100 dB down for full screen signal ( MIN DISTORTION mode )
492
Operator's
Handbook
1-3

Third order intermodulation distortion ,
10 kHz - 18 GHz
Third order intermodulation distortion with
option
01 ,
1.7-18
GHz
RF INPUT
Specifications
Maximum input level
Input
VSWR
1 dB compression point
without
option 01
with option 01 , 50 kHz - 1.7 GHz
with option 01 , 1.7-2.0 GHz
with option 01 , 1.8-18 GHz
L.O. emmission
without
option
01
with option 01
1-4
at least 70 dB down from any two on screen signals
within any frequency span -30 dBm inputs
100 dB down for two inputs of 100 MHz minimum
separation
+30 dBm ( > = 20 dB RF attenuation )
+13 dBm ( no RF attenuation )
better than 1.45 : 1 with > = 10 dB RF attenuation
-10 dBm
( no RF
attenuation )
-10 dBm ( no RF attenuation )
-28 dBm
( no RF
attenuation )
-10 dBm ( no
RF
attenuation )
-10 dBm ( no RF attenuation )
-70 dBm ( no
RF
attenuation )
492
Operator's
Handbook