Agilent Technologies 8922 - page 69

7-7
Adjustments and Calibration
Sum Loop Adjustment Procedure
Second Adjustment
9. Now set the HP/Agilent 8922 frequency to 502 MHz.
10.Set the spectrum analyzer center frequency to 488.6 MHz with a span of 10 MHz per
division.
11.Adjust R180 “GAIN” on top of Sum Loop (A25) until the signal on the spectrum
analyzer is centered within 10 MHz.
12.Reduce the spectrum analyzer span to 1 MHz per division, and adjust R180 again until
the signal on the spectrum analyzer is centered within 2 divisions (2 MHz).
Final Adjustment
13.Set the HP/Agilent 8922 frequency to 1000 MHz.
14.Set the spectrum analyzer frequency to 986.6 MHz, then set the span to 10 MHz per
division.
15.Adjust R160 “KNEEGAIN” on top of Sum Loop (A25) until the signal on the spectrum
analyzer is centered within 1 division (10 MHz).
16.Reduce the spectrum analyzer spanto 1 MHz per division, then adjust R160 again until
the signal on the spectrum analyzer is centered within 2 divisions (2 MHz).
Final Check
17.Repeat the above procedures until all three adjustments pass without any further fine
tuning.
18.Turn the instrument power off and reinstall the DAC/Upconverter Module. The
adjustment is now complete.