HP 8566B Adjustment Manual page 262

13. Sweep, DAC, and Main Coil Driver Adjustments
3-122 Adjustments
YTO Main Coil Driver Adjustments Setup (Alternate
31. Key in
readout should indicate 2 GHz).
32. Adjust A20R25 6.15 GHz adjustment to obtain two comb teeth
display. Comb teeth should be evenly spaced but not necessarily
aligned with CRT graticule lines (counterclockwise rotation of
adjustment increases spacing between comb teeth).
Adjust A20R34 2.3 GHz adjustment to align LO feedthrough signal
33.
(0 Hz) with center CRT graticule line. It might be necessary
to disconnect RF INPUT to locate LO feedthrough signal
(counterclockwise rotation of adjustment moves signal to right).
34. Repeat steps 32 through 33 until comb teeth are spaced two per
division and aligned with CRT graticule lines (every other comb
tooth will align with a graticule line).
(
35. Key in
CENTER
&
2,
ENTER FREQUENCY
MHz, 10 kHz,
36. Key in [RECALL] 1. With CAL OUTPUT connected to RF INPUT, at
least one comb tooth should be visible on display.
37. Adjust A20R25 6.15 GHz to align nearest comb tooth with center
CRT graticule line.
38. Key in [j?EZXQ 2.
39. Adjust A20R34 2.3 GHz to align nearest comb tooth with center
CRT graticule line.
40. Repeat steps 36 through 39 until no further adjustments are
necessary.
41. Key in (RECALL) 3.
Figure 3-63.
) 0 Hz (Frequency Span
FREQUENCY
[
2 GHz,
FREQUENCY
]
2 GHz,
(C ) CsHlFTl [=J
3,
ENTER FREQUENCY
100 MHz,
10