HP 8568B, Performance Tests And Adjustments Manual, Page: 194 / 313

8. 21.4 MHz Bandwidth Filter Adjustments
22. Adjust CTR to center signal on center graticule line.
Adjust SYM for best symmetry of signal. See Figure 3-42
for location of adjustments. If unable to adjust SYM
for satisfactory signal symmetry, increase or decrease value of
Refer to 3-3 for range of values.
23. All crystal filter bypass networks are removed. Signal should be
centered and symmetrical. If not, go back to step 16 and repeat
adjustments.
24. Press MARKER
SEARCH
]
and MARKER In].
25. Key in
SPAN
]
20 3 and MARKER
SEARCH].
26. Adjust XTAL to align markers on display. MARKER
A level should indicate 1.00 X. See Figure 3-42 for location of
adjustment.
LC Adjustments
27. Disconnect cable 97 (white/violet) from and reconnect to
Reconnect cable 89 (gray/white) to
28. Key in 100 and
[
FREQUENCY SPAN
]
200
29. Press
[
REFERENCE LEVEL
)
and adjust DATA knob to place signal peak
two division from the top graticule line.
30. Adjust LC CTR and LC CTR for maximum
MARKER level as indicated by CRT annotation. See Figure 3-43
for location of adjustments. If unable to adjust
and
LC CTR adjustments for satisfactory signal amplitude,
increase or decrease value of and Refer to
3-3 for range of values.
A t t e n u a t o r F i l t e r
Figure 3-43.
Location of 21.4 MHz LC Filter and Attenuation
Adjustments
31. Key in 1 MHz and 1 MHz.
32. Press MARKER
(
PEAK SEARCH
]
and MARKER
Adjustments