Tektronix 492 Service Manual

492/492P Service Vol. I (SN B030000 & up)
TABLE OF CONTENTS (cont)
Page
Section 5 THEORY OF OPERATION (cont)
110 MHz IF Amplifier and 3rd
Converter ....................................... 5-20
110 MHz IF Amplifier .................. 5-20
110 MHz Bandpass Filter .......... 5-21
3rd Converter.................................. 5-22
IF Section ....................................... 5-23
Variable Resolution Section ........ 5-23
Logarithmic Amplifier and
Detector...................................... 5-29
Display Section................................ 5-31
Functional Description ................ 5-31
Video Amplifier............................ 5-33
Video Processor ........................ 5-35
Digital Storage............................ 5-38
Vertical Section ...................... 5-39
Horizontal Section .................. 5-43
Deflection Amplifiers .................. 5-45
Z-Axis Circuits ............................ 5-46
High Voltage Supply .................. 5-47
Crt Readout................................ 5-48
Frequency Control Section .............. 5-55
Sweep........................................ 5-55
Span Attenuator ........................ 5-58
1 st Local Oscillator Driver .......... 5-61
Preselector Driver ...................... 5-63
Sweep Shaper and Bias Circuits. 5-66
Center Frequency Control .......... 5-67
Phaselock System (Option 03) ........ 5-70
Functional Description ................ 5-70
Phaselock Control ...................... 5-71
Error Amplifier and Synthesizer.. 5-73
Controlled Oscillator, Offset
Mixer, and Strobe Driver ............ 5-76
Digital Control.................................. 5-77
Processor.................................... 5-78
Memory Board ............................ 5-87
Front Panel................................ 5-88
Accessories Interface Board .... 5-94
Main Power Supply and Fan Driver. 5-94
Page
Section 5 THEORY OF OPERATION (cont)
Main Power Supply.................... 5-94
492P GENERAL PURPOSE
INTERFACE BUS ...................... 5-98
Section 6 RACKMOUNT/BENCHTOP VERSIONS
Introduction ..................................... 6-1
Electrical Characteristics ................ 6-1
Standard Accessories.......................... 6-3
Optional Accessories............................ 6-3
Rackmounting Installation Dimensions. 6-3
Slide-Out Tracks.................................. 6-3
Mounting Procedure ........................ 6-4
Alternate Rear Mounting Methods. . 6-5
Slide-out Track Lubrication .............. 6 - 6
Removing or Installing the
492/492P Spectrum Analyzer from
or in the Rackmount Cabinet .......... 6 -6
Removing the Side, Top, and
Bottom Panels................................ 6-7
Installing Semi-rigid Coaxial
Cables to Access the Cabinet
Rear Panel Connectors to the
Front Panel of the Instrument
(Option 31)...................................... 6-7
PREPARING THE INSTRUMENT FOR
CALIBRATION OR MAINTENANCE. . . 6-9
Appendix A GLOSSARY
General Terms...................................... A-1
Terms Related to Frequency ................ A-2
Terms Related to Amplitude ................ A-2
Terms Related to Digital Storage for
Spectrum Analyzers............................ A-3
CHANGE INFORMATION
iv
REV AUG 1981

Tektronix 492 Specifications

General

Brand	Tektronix
Model	492
Category	Measuring Instruments
Language	English