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Troubleshooting the Analyzer
To troubleshoot auto-range failures
3 For analyzers with the optional second channel, check the channel 2
auto-range signals.
a Press the following keys:
[Source]
0
[
dBm]
b Using a BNC cable, connect the SOURCE output to CHANNEL 2
input.
c Using a logic probe, check the TTL signals listed in the following
table. Rotate the RPG knob to change the source’s amplitude to
an under-range and over-range condition.
d Press the following keys:
[
Range]
[
channel 2]
[
ch2 autorange up-down]
[
Source]
e Rotate the RPG knob until the analyzer changes its range.
When the analyzer changes its range, the signals in the above table
should toggle.
f If the signals are correct, the A30 Digital Source assembly is
probably faulty.
Te s t
Location
Signal
Name
Input Range
Correct
Input Under
Range
(<-10 dBm)
Input Over
Range
(>+6 dBm)
Probable
Faulty
Assembly
A91 P1 pin 49 nOVRRNG2 High High Low A36 Trigger
A91 P1 pin 50 nHLFRNG2 Low High Low A36 Trigger
A91 J1 pin 11B nADCOVR2 High High Toggling A21 A/D Converter
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