HP 8568B, Performance Tests And Adjustments Manual, Page: 236 / 313

18. Frequency Control Adjustments
START and STOP
Adjustments
FM SPAN Adjustment
30.
22.
23.
Key in
STEP
1023 Hz.
Adjust LSD for DVM indication of
V dc. If not using an HP DVM, adjust for specified
voltage plus the DVM indication in step 20. See Figure 3-71 for
location of adjustment.
24. On the HP press
25. Connect frequency counter to rear-panel LO OUTPUT
connector.
26. Press
PRESET
),
then key in
STEP
CRT
annotation should indicate DACS 0.
27. Adjust START for frequency counter indication
of 2.050 0.002 See Figure 3-71 for location of
adjustment.
28. Key in
STEP
1023 MHz. CRT annotation should
indicate DACS 1023.
29. Adjust STOP STOP for frequency counter
indication of 3.7891 See Figure 3-71 for location of
adjustment.
Press
PRESET
),
then key in
(
CENTER FREQUENCY
)
10 MHz,
[
FREQUENCY SPAN
]
20
M
HZ
.
31.
32.
Connect CAL OUTPUT to SIGNAL INPUT 2.
Adjust FM SPAN so that the LO Feedthrough signal is
centered on the left edge graticule and the 20 MHz CAL OUTPUT
signal is centered on the right edge graticule. See Figure 3-71 for
location of adjustment.
3-122 Adjustments