Quote Originally Posted by DavyJones View Post
I can see were I made it sound like I thought I still have a pure sine wave thats not what I meant. What I was actually trying to say was what you just stated that because it was not a pure sine wave if I took thousands of readings and averaged those it would work.
It's a bit more complicated - it requires some complex math. See Digital True RMS Converters on page 3 of the referenced pdf.

If you look at the waveform and see it is more or less sinusoidal, then 0.707 x the peak output of the Allegro should get you close enough for what you're trying to do.