To Troubleshoot Auto-Range Failures - Agilent Technologies 89410A Service Manual

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:
If the analyzer has the optional second channel, perform Step 1 for both
channels.
1
1-80
Input
ADC
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.