HP 8753E - Al4 VCO Exercise

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Figure 7-19. 60 MHz HI OUT Waveform from A14Jl
Al4 VCO Exercise
The nominal tuning voltage range of the VCO is + 10 to -5 volts When the
analyzer is in operation, this voltage is supplied by the Al3 assembly. This
procedure substitutes a power supply for the Al3 assembly to check the
frequency range of the Al4 VCO.
1. Switch off the analyzer and remove the Al3 assembly.
2. Put the Al4 assembly on an extender board and switch on the instrument.
3. Prepare to monitor the VCO frequency, either by:
a. Activating the analog bus and setting the internal counter to the FRACN
node, or
b. Connecting an oscilloscope to A14J2 (labeled LO OUT) and looking for
waveforms similar to Figure 7-20.
Source Troubleshooting 7-27