Agilent Technologies 89410A - To Troubleshoot Auto-Range Failures

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Troubleshooting the Analyzer
To troubleshoot auto-range failures
To troubleshoot auto-range failures
Use this test when the auto-range function is suspected of failing and the
following self tests passed:
● Input
● ADC
If the analyzer has the optional second channel, perform Step 1 for both
channels.
1 Check over-range and half-range circuits.
a Using a BNC cable, connect the front panel SOURCE output to the
failing input channel.
b Press the following keys:
[Preset]
[
Source]
[
source on]
[level
]
0
[
dBm]
The channel over-range LED should be off and half-range LED
should be lit.
c Press the following keys:
10
[
dBm]
The over-range and half-range LEDs should be lit.
d Press the following keys:
-10
[
dBm]
The over-range and half-range LEDs should be off.
e If the LEDs responded correctly, the A30 Digital Source assembly
is probably faulty.