Chapter 8 179
Hardware Options
Verifying Option 122 or 140, Wide Bandwidth Digitizer
Viewing the wide band response to a comb signal
(outer loop test):
If the display is correct, you must now inject a comb calibration signal
through a larger signal path. The comb signal from A32 Wide Band
Digital IF will now be injected into the A14 input attenuator and go
through the RF path and the A10 3rd Converter before entering the
A31 wideband analog and A32 digital IF assemblies. This is the outer
loop test.
Perform the outer loop test as follows:
1. Press
Input/Output, Input Port, WB Align (f=300 MHz)
2. Press Frequency, type in 300 MHz
You must tune the analyzer to 300 MHz because the WB Align comb
signal will now be present at the front end of the instrument.
The displayed comb signal level will decrease about 10 dB referenced to
the displayed level of the IF Align signal in the inner loop test. The
comb spacing and relative comb amplitudes will remain the same as
they were in Figure 8-5.
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