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18. Frequency Control Adjustments
START and STOP
Adjustments
FM SPAN Adjustment
30.
22.
23.
Key in
(ml
[CF
STEP SIZE)
J
1023 Hz.
Adjust
A22
LSD VT0
A22R7
for DVM indication of +0.0218
f0.0001
V dc. If not using an HP
3455A
DVM, adjust for specified
voltage plus the DVM indication in step 20. See Figure 3-71 for
location of adjustment.
24.
On the HP
3456A,
press
INIATH)
(ZJ
err.
25.
Connect frequency counter to rear-panel
1ST
LO OUTPUT
connector.
26.
Press
(~NSTR
PRESET), then key in
ISHIFT)
CCF
STEP SIZE) J. CRT
annotation should indicate DACS 0.
27.
Adjust
A22
START
A22R39
for frequency counter indication
of 2.050
GHz
f
0.002
GHz.
See Figure 3-71 for location of
adjustment.
28.
Key in
ISHIFT)
CCF
STEP SIZE)
J
1023 MHz. CRT annotation should
indicate DACS 1023.
29.
Adjust
A22
STOP
A22
STOP
A22R35
for frequency counter
indication of 3.7891
*0.002
GHz.
See Figure 3-71 for location of
adjustment.
Press (INSTR PRESET), then key in (CENTER FREQUENCY) 10 MHz,
[FREQUENCY SPAN] 20 MHZ.
31.
32.
Connect CAL OUTPUT to SIGNAL INPUT 2.
Adjust
A22
FM SPAN
A22R64
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