414 Chapter8
IF Section
Troubleshooting Using the TAM
10.7 MHz).
6. Reduce the span of the other spectrum analyzer to check that the cal
oscillator is actually sweeping. If the oscillator is not sweeping,
perform the following steps:
a. The output of the sweep generator circuit (A4U804 pin 8 of
function block Z) should be a series of negative-going parabolas
(frequency and amplitude vary depending on the sweep width
chosen). Table 8-3 on page 414 lists the RANGE, MA0, and MA1
values for the sweep widths. If a failure is indicated in the
IF/LOG CHECK, press
More Info to provide more detailed
information about the detected failure. If an HP-IB printer is
available, connect it to the spectrum analyzer HP-IB connector,
then press
Print Page for a hard-copy output.
Table 8-3 Sweep Width Settings
Sweep
Width
Sweep
Time
Res BW
Adjusted
RANGE
A4U105Pin6
MA1 A4U105
Pin 2
MA0 A4U105
Pin 5
20 kHz 5 ms 10 kHz +5 V 0 V 0 V
10 kHz 10 ms 3 kHz +5 V 0 V +5 V
4 kHz 30 ms 1 kHz +5 V +5 V 0 V
2 kHz 15 ms 300 Hz +5 V +5 V +5 V
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