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18. Frequency Control Adjustments
18. Frequency
Control
Adjustments
Reference
Related Performance
Tests
Description
Equipment
Procedure
RF Section:
A22
Frequency Control
Sweep Time Accuracy Test
Frequency Span Accuracy Test
Center Frequency Readout Accuracy Test
The sweep reference voltage is adjusted and then the sweep times are
adjusted for proper tolerances. The sweep tune voltage is adjusted.
Then the YTO DAC, VT0 DAC, and LSD VT0 DAC are adjusted, each
to within its tolerance. Next, the Start and Stop frequencies are
adjusted. FM Span is adjusted next for the proper amount of FM
deviation.
SPECTRUM ANALYZER
DIGITAL VOLTMETER
FREPUENCY COUNTER
Figure 3-70. Frequency Control Adjustments Setup
Digital Voltmeter (DVM) . . . . . . . . . . . . . . . . . . . . . . . . HP
3456A
Frequency Counter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 5340A
1. Place instrument on right side with IF-Display facing right as
shown in Figure 3-70 and remove bottom cover.
2. Set LINE switch to ON and press
QNSTR
PRESET).
3. Connect DVM to
A22TP15
and ground to
A22TP12.
4. Adjust
A22
REF
A22R94
for DVM indication of
+
10.00
ho.01
V
dc.
See Figure 3-71 for location of adjustment.
Adjustments
3-l
19