Propeller Head Plaza

Posted by andy_c (A) on March 22, 2008 at 10:37:07

In Reply to: RE: RMS detector... posted by rick_m on March 22, 2008 at 10:11:06

That is confusing!

I'm familiar with how conventional AC voltmeters do this. They full-wave rectify the signal, take the average of that, then scale it so that it reads the RMS value of a sine wave. The output ends up being:

computed RMS value = pi / (2*sqrt(2)) * average of absolute value of voltage vs. time. (Since the average of a full-wave rectified sine wave is 2/pi times its peak value).

I don't think this formula works for a general periodic function though (the distortion residual). That's really baffling.

• You're right. Ironic, isn't it? - rick_m 10:55:54 03/22/08 (9)
  • Okay, I found more info on this... - andy_c 11:07:35 03/22/08 (8)
    • RE: Have fun... - rick_m 11:32:45 03/22/08 (7)
      • FFT Analyzers are the way to go... - gymwear5@hotmail.com 07:12:40 03/25/08 (6)
        • You bet! - rick_m 09:34:43 03/25/08 (0)
        • RE: FFT Analyzers are the way to go... - morricab 09:07:19 03/25/08 (4)
          • RE: FFT Analyzers are the way to go... - gymwear5@hotmail.com 12:31:22 03/25/08 (3)
            • RE: FFT Analyzers are the way to go... - morricab 02:03:56 03/26/08 (2)
              • RE: FFT Analyzers are the way to go... - gymwear5@hotmail.com 07:50:46 03/26/08 (1)
                • RE: FFT Analyzers are the way to go... - morricab 01:11:52 03/27/08 (0)

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