| Electronics > Repair |
| Please help, FLUKE 8920A Multimeter Repair |
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| daisizhou:
--- Quote from: Harry_22 on June 09, 2024, 11:24:37 am ---Sinus 1kHz as usual. Gradually increase the amplitude until a good signal appears on the oscilloscope screen. Yes connect oscilloscope to TP1. --- End quote --- Hi Following your suggestion, I set the input signal. But I increased the amplitude from 2mv to 20mv, TP1 was always 8.4v DC.Finally, I set 1v and 2v to be the same. Is there something wrong? |
| Harry_22:
That is good. We observe the circuit's response to external disturbance. Please connect the generator via 10k to pin 4 (the negative OPAmp input) and do the same test. |
| daisizhou:
Do you mean for me to connect as shown below? Connect a 10K resistor to the positive terminal of the signal generator and then connect it to the 4th pin.The negative pole of the signal generator is connected to the metal shell. Then observe the TP1 waveform, right? |
| Harry_22:
Yes, exactly! |
| daisizhou:
--- Quote from: Harry_22 on June 09, 2024, 12:26:08 pm ---Yes, exactly! --- End quote --- Excuse me, can you please confirm once again that there will be no other failures in this connection? Because this is my first time to connect and test,I am worried about burning out components due to incorrect connections or testing. |
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