HP 8901B

Adjustments Model 8901B
Table of Contents
Introduction ..................................................................................... 5-1
Safety Considerations ............................................................................. 5-1
Equipment Required .............................................................................. 5-1
Factory-Selected Components ...................................................................... 5-2
Post-Repair Tests. Adjustments. and Checks ......................................................... 5-2
Related Adjustments .............................................................................. 5-2
Adjustment 1 - Power Supply ..................................................................... 5-5
Adjustment 2 - Internal Reference Frequency ....................................................... 5-6
Adjustment 3 - RF Level Detector Offset .......................................................... 5-7
Adjustment 4 - Sampler Efficiency and Offset ...................................................... 5-8
Adjustment 5 - LO Doubler Output Power and Balance ............................................. 5-10
Adjustment 6 - Voltmeter Offset and Sensitivity ................................................... 5-12
Adjustment 7 - 15 kHz and >20 kHz Low-Pass Filter Gain ......................................... 5-14
Adjustment 8 - ALC Reference .................................................................. 5-15
Adjustment 9 - FM Calibrator ................................................................... 5-16
Adjustment 10 - FM Sensitivity ................................................................. 5-17
Adjustment 11 - FM Flatness .................................................................... 5-18
Adjustment 12 - FM Distortion and Incidental AM - 1.5 MHz IF .................................. 5-19
Adjustment 13 - cPM Sensitivity ................................................................. 5-21
Adjustment 14 - AM Calibrator .................................................................. 5-23
Adjustment 15 - AM Sensitivity ................................................................. 5-24
Adjustment 16 - FM Distortion and Incidental AM - 455 kHz IF .................................. 5-25
Adjustment 17 - Tkack-he Mode Offset ......................................................... 5-27
Adjustmeiic 18 - Power Reference (Using Reference Comparison) .................................... 5-28
Adjustment 19 - Power Reference (Using DC Substitution) ......................................... 5-30
Adjustment 20 - Power Meter .................................................................... 5-33
Adjustment 22 - Battery Backup ................................................................. 5-37
Adjustment 21 - Audio True RMS Detector and Notch Filter Gain .................................. 5-35
5-0