Location Of A4A8 21.4 Mhz Crystal Filter Adjustments - HP 8568B Performance Tests And Adjustments Manual

33. Key in t-1 100 kHz, C-1 200 kHz, and MARKER
[ SEARCH].
PEAK
34. Adjust A4A8R35 LC to align makers on display. MARKER A level
should indicate 1.00 X. See Figure 3-43 for location of adjustment.
35. Repeat steps 31 through 34 until no further adjustment is
necessary.
36. Key in 30 kHz,
MARKER IOFF).
37. Connect crystal filter bypass network between A4A8TPl and
38. Press
(
REFERENCE LEVEL
two division from the top graticule line.
39. Adjust A4ASC44 CTR to center signal on center graticule line.
Adjust A4A8C42 SYM for best symmetry of signal. See Figure 3-44
for location of adjustments. If unable to adjust A4A8C42 SYM
for satisfactory signal symmetry, increase or decrease value of
A t t e n u a t o r - B a n d w i d t h F i l t e r

Location of A4A8 21.4 MHz Crystal Filter Adjustments

40. Remove crystal filter bypass network from between A4A8TPl and
41. Adjust A4A8C29 CTR to center signal on center graticule line.
Adjust A4A8C13 SYM for best symmetry of signal. See Figure 3-44
for location of adjustments. If unable to adjust A4ABC13 SYM
for satisfactory signal symmetry, increase or decrease value of
42. Press MARKER
43. Key in
[
FREQUENCY SPAN
44. Key in [REsBW) 3 kHz and MARKER
8. 21.4 MHz Bandwidth Filter Adjustments
100 kHz. Press
[ ]
FREQUENCY SPAN
and adjust DATA knob to place signal peak
)
Figure 3-44.
and MARKER @
)
SEARCH
10 kHz.
]
).
SEARCH
Adjustments 3-81