Dewesoft X3 software giving wrong RMS value if sampling rate is 500ks/s

Hi,

I have measured 230V pure ac sinewave output from one inverter, When I select Display Type as "Real Value" in Y Axis menu it shows correct value, but if I select RMS, it shows wrong value for 500KS/s, but this problem not occurred when i select 20KS/s. Refer attachment.

Hi,

as it looks from the screenshots you have sent, the block size for calculating the RMS is too short. The block size should be at least one period of the measured Sine wave.

I would suggest making this calculation in the basic statistics.