Vco Range Check With Oscilloscope - HP 8753D Option 011 Service Manual

If the readings fail the speci ed limits, perform the \ 14 VCO Exercise."
A14 VCO Range Check with Oscilloscope
1. Remove the W9 HI OUT cable ( 14J1 to 7) from the 7 assembly and connect it to an
oscilloscope set for 50 ohm input impedance. Switch on the analyzer.
2. Press
RESET SYSTEM
5
FR CN TUNE service mode. See Chapter 10, \Service Key Menus and Error Messages,"
for more information on the FR CN TUNE mode.
3. Vary the fractional-N VCO frequency with the front panel knob and check the signal with
the oscilloscope. The waveform should resemble Figure 7-17, Figure 7-18, and Figure 7-19.
If the fractional-N output signals are correct, continue source troubleshooting by skipping
ahead to \ 7 Pulse Generator Check."
Figure HO107 here.
Figure 7-17. 10 MHz HI OUT Waveform from A14J1
RAFT
3/21/106 15:13
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ERVICE MENU ERVICE MODE
5
to activate the
FRACN TUNE ON
Source Troubleshooting 7-23