I've a question regarding the use the "Add measurement" or how the calculations are done on the measurement "TRUE RMS".
My basic knowledge about "TRUE RMS" value of a perfect sinus AC signal is, that to get the "TRUE RMS" of a AC signal you must multiply the the positive peak value by 0.707.
When you look at this AC-signal, has it a peak to peak value of 1.163 volt and the half of this is 581.5 mV (peak value).
Multiply the peak value 581.5 mV with 0.707 and the result are 0.411 mV TRUE RMS.
But it is here I get confused, when I look at "Add Mesaurement" True RMS - it shows a TRUE RMS value of 351.1 mV which does not correspond with my calculation above.
Is the calculation inaccurate because of this AC signal not being a perfect sinus !!!.