Please note that experience with a Lecroy Waverunner Oscilliscope is most likely required to answer this question.
I'm attempting to measure the power draw of a brushless 3-phase motor with a Lecroy WaveRunner 204MXi. I've connected two current probes and two differential voltage probes in order to provide two Wattmeters. I've connected the current probes to Phase A (for Ia) and Phase B (for Ib), and the differential voltage probes across Vac and Vbc. This matches the configuration detailed here by Lecroy:
And from the link, the power draw at any point in time is:
P = VacIa+VbcIb
This is only, I believe, the real power. I should also be calculating the complex power, correct? The complex power will be draw from the battery, and so it is my actual current draw?
S = Vac(rms)*Ia(rms)+Vbc(rms)*Ib(rms)
The issue I'm facing is that to calculate RMS is, for the Lecroy Waverunner oscilliscope, a measurement (P?). RMS is not available as a math function. Then I need to perform three math functions F1=P1*P2, F2=P3*P4 and finally my complex power would be F3=F1+F2. Here, P1,P2,P3 and P4 are my RMS voltages and currents.
The issue I'm facing is that the math multiplication functions only allow for 1 measure to be included as an input? I can have, for example F1=P1*C1 (where C is a channel), but not F1=P1*P2? Am I measuring complex power correctly? Is there a better way to measure complex power with a Lecroy Waverunner?
Any insights are much appreciated.