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Help, how can I calibrate AC current
daisizhou:
Hello everyone.I plan to calibrate a multimeter,I don't have a standard signal source for its AC current.
Currently, I only have one digital oscilloscope and a 20M signal generator.
Is there a good way to calibrate it? If you know, please let me know. Thank you
Fungus:
What multimeter?
radiolistener:
You can use oscilloscope to calibrate DMM RMS Voltage measurement. Just enable RMS measurement on the oscilloscope and setup proper calibration voltage on generator, then apply it to your DMM for calibration procedure.
For RMS current - connect generator through DMM to a dummy load and use RMS measurement on oscilloscope to measure voltage drop on the dummy load and to setup proper calibration current by tuning generator amplitude, then calibrate DMM.
When you know dummy load R and RMS voltage U, you can calculate RMS current with Ohms law: I = U / R
But note, that high frequency is sensitive to a wire configuration and can be affected with ringing due to wave reflections from impedance mismatch. So, use 50-1000 Hz for calibration.
Fungus:
--- Quote from: radiolistener on June 10, 2023, 01:47:12 am ---You can use oscilloscope to calibrate DMM RMS Voltage measurement. Just enable RMS measurement on the oscilloscope and setup proper calibration voltage on generator, then apply it to your DMM for calibration procedure.
--- End quote ---
Accuracy will be very limited.
daisizhou:
I am referring to the AC current level
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