| Electronics > Repair |
| FLUKE 8920A RMS AC meter failure needs help |
| << < (3/5) > >> |
| 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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