HP 8566B Adjustment Manual page 221

37. Connect CAL OUTPUT to RF INPUT. Key in (-1, C-1 9,
38. Adjust the spectrum analyzer front panel FREQ ZERO control for
maximum signal amplitude on the CRT display.
39. Key in [RESBW) 1 kHz and DISPLAY LINE C-1. Using the
DATA knob, place the display line at the signal trace.
40.
Key in (REs] 10 Hz.
41. Adjust the spectrum analyzer front panel FREQ ZERO control for
maximum signal amplitude on the CRT display.
42. Adjust A4A7R30 10 Hz AMPTD and A4A7R41 10 Hz AMPTD equal
amounts to set the signal level the same as the reference level set
in step 39. See Figure 3-38 for location of 10 Hz AMPTD adjusts.
43. Repeat steps 37 through 42 until no further adjustment is
required.
Factory-select component A4A7R60 sets the overall gain of the A4A7
3 MHz Bandwidth Filter, and is selected as required in Adjustment
Procedure 10, "Step Gain and 18.4 MHz Local Oscillator Adjustments."
This procedure should be performed if the A4A7 3 MHz Bandwidth
Filter or the A4A5 Step Gain Assembly is replaced or repaired.
The remaining adjustments and selection of factory-select components
for the A4A7 3 MHz Bandwidth Filter are performed in Adjustment
Procedure 9, "3-dB Bandwidth Adjustments. n This procedure should
be performed if the A4A7 3 MHz Bandwidth Filter is replaced or
repaired.
7. 3 MHz Bandwidth Filter Adjustments
Adjustments 3.91