Resolution:
Normally, a True-RMS Digital multimeter (DMM) will read about 20 to 30% higher output voltage than what the actual Output voltage is. The reason is that a standard True-RMS DMM cannot reliably filter out the PWM(Pulse Width Modulation) output waveform and High Frequency noise from the VFD. A DMM with a Low Pass filter can fix this issue and can measure the output voltage more accurately.

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