Agilent Technologies 83620A Service Manual page 662

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High Band Video Feedthrough
ypically, high band video feedthrough is so small that it is
Note
dicult to measure. Use the following procedure to verify that
the video feedthrough is negligible.
21. On the oscilloscope, set channel 1 to 1 mV/div.
22. On the synthesizer, set the rst CW frequency in able 2-23.
Table 2-23. High Band Video Feedthrough Frequencies
23. On the oscilloscope, note the maximum voltage from the baseline. Video
feedthrough (Vp) =
24. Repeat steps 22 and 23 for each value in able 2-23.
25. Using the worst case voltage (largest value) from ( able 2-23), calculate the
video feedthrough as follows using the video gain from step 10:
Video Feedthrough (Vp) = Video Vp/Video Gain
Record this value on the test record.
Millimeter Band Video Feedthrough
Disregar if beyon your synthesizer's capability.
26. Remove the 130 MHz lter from the test setup.
27. Repeat steps 7 through 10 to check video gain once more.
Change A
Frequency Video
(GHz) Feedthrough (Vp)
5.0
10.0
15.0
20.0
23.0
Vp. Record this value in able 2-23..
20 GHz
Pulse Modulation Video Feedthrough
Performance Tests 12-37