Electronics > Repair
Please help, FLUKE 8920A Multimeter Repair
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Harry_22:
Open the shield and make the photo from upper point.
daisizhou:
Please review the image.
The electronic components inside the metal shielding cover are very sensitive,If the metal shielding cover is removed, as long as the human body approaches, the 8920a host display will show a digital change.
So I don't know how to operate it correctly,to ensure the accuracy of measurement
Harry_22:
Connect input o-ring terminal to the shield by short wire. Switch on and check for self oscillation.
daisizhou:
Do you mean the green connection like the picture below?

If it is connected like this, I tried.There is still a lot of interference, I mean human body interference.
If the test is forced, I am not sure whether the test results are accurate.
Harry_22:
Please do the green connections.
Don't take care about human interferience. Check for lack of self oscillation and start testing:
1. Set up generator frequency 370 Hz and 2mV level.
2. Set up 2mV manual range on RMS.
3. Connect your oscilloscope to TP3 and check the signal. It should be around 1V.
It must be clear sine with symmetry around zero line (if not please stop here).

Check self oscillations by switching generator signal on/off. If you will see big interferience or oscillations please increase the measurement limit as well as the signal level.
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