Electronics > Repair
Please help, FLUKE 8920A Multimeter Repair
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daisizhou:
I tested it again.
Harry_22:
Well done!

Is it possible to reduce the level to see the clear sinus? If not please use 10k.
daisizhou:

--- Quote from: Harry_22 on June 10, 2024, 09:43:53 am ---Well done!

Is it possible to reduce the level to see the clear sinus? If not please use 10k.

--- End quote ---

clear sinus?I don't understand what you're saying.What do you need to observe carefully?

Can I change the resistor to 10K and test it again?
Harry_22:
Yes.
Now we see clipped signal and I can't calculate amplification factor.
Could you try to set the level to see sinus on your screen without any clipping.

Seems I found out the malfunction reason. The operational amplifier has very high gain.
My Microcap shows the same surprisingly.

Harry_22:
Measure the voltage at following points A and B.
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