I am going to measure the AC current(three phases), with a current probe, of a large machine, with an oscilloscope. The scope I am using has the following two options:
- RMS: RMS (Root Mean Square) value of the voltage of the complete displayed waveform.
- AC: RMS value of the AC part of a periodic signal, calculated over all periods on the display. The AC result is is derived from the DC and AC+DC results.
Can someone tell me the differences of the two measuring types?