Frequency Control Adjustments; Frequency Control Adjustments Setup - HP 8568B Performance Tests And Adjustments Manual

18. Frequency
Control
Adjustments
Reference
Related Performance
Tests
Description
Equipment
Procedure
RF Section:
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,
adjusted. FM Span is adjusted next for the proper amount of FM
deviation.
DIGITAL VOLTMETER
Figure 3-70. Frequency Control Adjustments Setup
Digital Voltmeter (DVM) . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A
Frequency Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 5340A
1. Place instrument
on
shown in Figure 3-70 and remove bottom cover.
2. Set LINE switch to ON and press
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.

18. Frequency Control Adjustments

Start and Stop frequencies are
the
SPECTRUM ANALYZER
right side with IF-Display facing right as
PRESET
FREPUENCY COUNTER
).
Adjustments 3-l 19