Electronics > Repair
FLUKE 8920A RMS AC meter failure needs help
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daisizhou:
I checked the fault according to the troubleshooting table on page 53 of the service manual.

daisizhou:
Can anyone help me? I'm still waiting, thank you
daisizhou:
I tested TP3, TP4, TP5 waveform video, please check

daisizhou:
The "700" status TP3 waveform is displayed. Unfortunately, the TP4 and TP5 waveforms are not obtained.


Normal state TP3 TP4 TP5 waveform diagram
daisizhou:
I found that it seems to be caused by the load resistor.
The 8920a always fails when I turn it on after connecting it with a 50 ohm load resistor,When I disconnect the 50 ohm load resistor, the fault no longer occurs.Here are my recent findings and I will continue to test.
Magical malfunction phenomenon.I took pictures of the actual load and drew a simple schematic diagram

I read the 8920a user manual, and it does not prohibit starting with a load resistor.At least the manual doesn't specifically emphasize that this is wrong.
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