Chapter 2 95
Making Adjustments
14. Comb Generator
• Each time the value of A3A1L3 is changed, reconnect the power
cord, set the
LINE switch to ON, and adjust A3A1C3 OSC PEAK
for maximum signal. The output frequency changes when
A3A1C3 OSC PEAK is adjusted. Reinstall the comb generator
cover plate and repeat step 8 to step 12.
Output Power
14.Zero and calibrate the power sensor/measuring receiver combination
in log mode (power reads out in dBm). Enter the power sensor
0.1 GHz cal factor into the measuring receiver.
15.Connect the power sensor to the output of the 20 dB attenuator
using an adapter.
16.Adjust A3A1C15 OUTPUT MATCH for maximum power output.
The measuring receiver should measure +6 dBm ±0.8 dB.
17.If the output power of the comb generator is out of tolerance,
perform the following:
• Set the
LINE switch to OFF, remove the power cord, and remove
the A3A1 comb generator cover plate.
• Change the selected value of A3A1R6 to obtain an output power
reading of +6.0 dBm ±0.8 dB. Increasing the value of A3A1R6
decreases the output power of the comb generator, while
decreasing the value increases the output power. Refer to Figure
2-26 for component location.
• Each time the value of A3A1R6 is changed, reconnect the power
cord, set the
LINE switch to ON, and adjust A3A1C16 OUTPUT
MATCH for maximum power out.
18.Reinstall the comb generator assembly cover plate and all the
screws. Connect a BNC cable from the 20 dB attenuator to the
frequency counter input using adapters.
19.Adjust A3A1C5 FREQ for a frequency counter reading of
100.000000 MHz ±0.000010 MHz (tolerance of ±10 Hz).
20.Set the
LINE switch to OFF and reconnect W24 to A3A1J1.
21.Reinstall A3A1 comb generator assembly into RF Section. Refer to
the A3A1 comb generator assembly replacement procedure.
22.Reinstall the front-end assembly in the analyzer. Refer to the
“Front-End Assembly” replacement procedure.
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