344 Keysight N9038A MXE Service Guide
Analog & Digital IF
A3 Digital I.F. Troubleshooting
22.5 MHz IF Signal Processing
While this assembly does process the 22.5 MHz IF signal, it does so with two
inputs that come from other assemblies. These two input signals are:
— 22.5 MHz IF Input from the A2 Analog IF Assembly
— 10 MHz Reference Signal from the A16 Reference Assembly
Before looking for a fault on the A3 Digital IF assembly be sure to verify that
both of these signals are of the correct frequency and amplitude. Refer to the
Analog IF section earlier in this chapter and Chapter 9, “Reference Assembly”
for detailed information on how to verify the frequency and amplitude of these
signals.
If both of these signals are of the correct frequency and amplitude and yet
there is still no signal being processed and displayed on the instrument screen
then the A3 Digital IF assembly is the most likely cause of the failure.
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