HP 8560A

8
IF Section
The IF Section contains the A4 Log Amplifier/Cal Oscillator and A5 IF assemblies.
Troubleshooting Using the TAM
......................................................
.8-3
Troubleshooting A4 Log Amplifier with the TAM
.............;.
..................... .8-4
Troubleshooting A5 with the TAM
..................................................
.8-4
Troubleshooting A4 Cal Oscillator with the TAM
....................................
.8-8
Automatic IF Adjustment ...........................................................
..8- 9
Parameters Adjusted ..............................................................
..8-10
Requirements .....................................................................
..8-11
Performance Test Failures
..........................................................
..8-12
IF Gain Uncertainty Performance Test
.............................................. 8-12
Scale Fidelity Performance Test
....................................................
.8-13
Resolution Bandwidths Performance Tests
..........................................
.8-13
A4 Log Amplifier Assembly
.......................................................... .8-14
Log Amplifier .....................................................................
..8-14
Linear Amplifiers .................................................................
..8-15
Video Offset
......................................................................
..8-16
Video Output
.....................................................................
..8-16
Frequency Counter Prescaler/Conditioner
...........................................
8-17
AM/FM Demodulator
............................................................
..8-17
4.8 kHz IF Filters .................................................................
..8-17
4.8 kHz and 10.7 MHz IF Filters
.................................................... 8-18
10.6952 MHz VCXO
................................................................ 8-19
Input Switch
.......................................................................
.8-19
LO Switch
......................................................................... .8-19
Synchronous Detector .............................................................
..8-2 0
Limiter ..........................................................................
..8-2 0
Isolation Amplifier ...............................................................
..8-2 0
Detector/Mixer ..................................................................
..8-2 0
Log Offset/Gain Compensation
.....................................................
.8-21
Log Offset Compensation
.........................................................
.8-21
Log Gain Compensation .........................................................
..8-2 1
Video Mux ........................................................................
..8-2 1
A5 IF Section
......................................................................
..8-2 2
IF Signature
......................................................................
..8-2 3
Common IF Signature Problems
....................................................
.8-28
1 MHz Resolution Bandwidth Problems
............................................
.8-30
30 kHz Resolution Bandwidth Problems
............................................
.8-32
3 kHz and 10 kHz Resolution Bandwidth Problems
.................................
.8-32
Step Gains ........................................................................
..8-3 3
A4 Cal Oscillator Assembly
..........................................................
.8-34
Cal Oscillator Unlock at Beginning of IF Adjust
....................................
.8-35
Inadequate CAL OSC AMPTD Range
..............................................
.8-35
IF Section 8-l