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                                    The Tektronix 492 and 496 are two spectrum
analyzers that go where you go. Their
compact size, light weight, and rugged
design combine to offer unmatched portability
in laboratory quality analyzers.
Single-handle carry and portable form factor
make them ready to travel. The 492 and 496
move as easily in the field as in the design
lab or systems test area. They even fit under
an airplane seat.
You can count on the same exceptional performance
no matter where you're working. If
its antenna test measurements, point-topoint
transmission maintenance, or any
number of critical field applications, the 492
and 496 work with you.
For on-site applications, reduced warmup
time means reduced measurement time.
Typical long-term frequency drift of 5
kHz/10 minutes after 30 minute warm up for
the 492 and 492P; 2 kHz/10 minutes after 30
minute warm up for the 496 and 496P.
Here's Proof of Their Performance
The Tektronix 492 has the widest amplitude
calibrated frequency range of any spectrum
analyzer on the market: 50 kHz to 220 GHz
—to 21 GHz in coax, from 18 GHz to
220 GHz using Tektronix external waveguide
mixers. The VHF/UHF 496 covers from
1 kHz to 1.8 GHz.
They offer 80 dB dynamic range on-screen
and excellent sensitivity, with an average
noise level of — 123dBm at 100 Hz resolution
bandwidth for the 492, -127 dBm at
30 Hz resolution bandwidth for the 496. Low
phase noise —70 dBc at only 3 kHz offset
—for accurate small-signal analysis. High
stability for signal source spectral purity
analysis, with residual FM of no more than
50 Hz peak-to-peak for the 492, 10 Hz peakto-
peak for the 496. For precise measurement
of signal differences, there's amplitude
comparison in super-fine 0.25 dB
steps. And the 496 provides 1 kHz frequency
resolution in AF mode. All this and more
in one compact package that goes where
you go.
Programmability/IEEE (GPIB)
Compatibility
The GPIB interface enables full control of all
measurement settings. Additional control of
horizontal (span) and vertical display (1 dB
to 15 dB/div) and smart functions (such as
signal search) provide added measurement
versatility. A desktop computer or computer
controller (4052A or 4041) and a 492P or
496P Spectrum Analyzer provide repetitive
measurements, data collection, and consistent,
rapid results. Automated testing and
monitoring may include data correction and
analysis enabling complex measurements
such as total harmonic distortion and power
spectral density. The thermal printer of the
4041 or hard copiers for 4052A simplify
documenting tests and spectral displays in
hard copy form.
Programmability Now—or Later
Most manual 490 Series spectrum analyzers
can be converted into fully programmable,
GPIB compatible analyzers. Conversion may
be performed via the Tektronix Service Center
near you.
Easy to Use—Anywhere
Tektronix designed the 492 and 496 to handle
your measurement task with microprocessor-
aided ease. Setting frequency, span
and reference level is a simple three-knob
operation. Most-used functions are automatically
controlled. Digital storage and signal
processing eliminate time-consuming
display adjustments. And constant tuning
rate helps you position a signal quickly and
accurately. All part of the convenience and
capability the 492 and 496 deliver, on site or
on the bench.

Service Manual Volume I

Introduction
The Service manual consists of two volumes that contain
information necessary to test, adjust, and service the
Portable Rackmount/Benchtop 492/492P Spectrum Analyzer. The
intent is to provide as complete information as possible as
an aid in servicing this instrument. The Table of Contents
at the beginning of Volume 1 lists contents of each section
contained within Volume 1.
Change information that involves manual corrections and/or
additions pending manual reprint and bind, is located at the
back of the Service manual in the CHANGE INFORMATION section.
History information with the updated data is integrated into
the text or diagrams when a page or diagram is updated.
Revised pages have a revision date in the lower inside
corner of the page. The manual may contain revisions that do
not apply to your instrument; however, history information
with updated data, is integrated into the text or diagram
when the page or diagram is revised.

Service Manual VOLUME 2 - A
REPLACEABLE ELECTRICAL PARTS

Service Manual Volume 2 - B
DIAGRAMS & CIRCUIT BOARD ILLUSTRATIONS

Service Manual Volume 2 - C
Replaceable Mechanical Parts &
Manual Change Information