HP 8568B, Performance Tests And Adjustments Manual, Page: 197 / 313

62.
63.
64.
65.
66.
67.
8. 21.4 MHz Bandwidth Filter Adjustments
approximately -17 (to the left). If unable to achieve a “dip”
in signal amplitude, increase or decrease value of Refer
to 3-3 for range of values.
Remove short from and short to ground.
Adjust LC DIP for minimum amplitude of signal peak.
See Figure 3-43 for location of adjustment. Key in
[
PEAK SEARCH
)
MARKER and adjust LC DIP again to offset the signal peak
approximately -17 (to the left). If unable to achieve a “dip”
in signal amplitude, increase or decrease value of Refer
to 3-3 for range of values.
Set LINE switch to STANDBY.
Reinstall Attenuator-Bandwidth Filter without extenders.
Remove short. from
Set LINE switch
to
ON. Press
PRESET
].
Go back and repeat LC adjustments for both the Bandwidth
filter and the Attenuator-Bandwidth Filter.
AlOdB and Adjustments
68.
69.
70.
71.
72.
73.
74.
Set, step attenuators to 25
Key in
FREQUENCY
]
20 MHz, 3
0 1 and
[
REFERENCE
-30
Key in LOG
[
ENTER
1 then press MARKER
(
PEAK SEARCH
)
MARKER
Key in
[
REFERENCE LEVEL
)
-20 Set step attenuators to 15
Adjust AlOdB to align markers on display. MARKER
A
level should indicate 0.00 See Figure 3-43 for location of
adjustment.
Key in
(
REFERENCE LEVEL
)
-10 Set step attenuators to 5
Adjust to align markers on display. MARKER
A
level should indicate 0.00 See Figure 3-43 for location of
adjustment.
Adjustments 3-83