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From: rsd@sei.cmu.edu (Richard S D'Ippolito)
Newsgroups: sci.electronics
Subject: Re: Meters and RMS, was: Powerline voltage too high...
Message-ID: <9850@as0c.sei.cmu.edu>
Date: 3 Jan 91 15:28:34 GMT
References: <9839@as0c.sei.cmu.edu> <10003@pasteur.Berkeley.EDU>
Reply-To: rsd@sei.cmu.edu (Richard S D'Ippolito)
Organization: Software Engineering Institute, Pittsburgh, PA
Lines: 18

In article <10003@pasteur.Berkeley.EDU> Charles Sullivan writes:

  >>Your KWHr meter has always been RMS-responding.
  >>[...]
  >>Rich

 >RMS is not and should not be used in 'true' power meters.  They read just
 >plain average power ( I will use '<P>' for this).  The only reason people
 >use RMS to begin with is to be able to calculate <P> from V^2/R by using
 >V=RMS(V(t)).


Indeed, Mr. Sullivan is correct and my short statement about the KWHr meter
is incorrect.  The mechanical and hall-effect electronic meters do multiply
the instantaneous values and integrate.  Sorry for its inclusion.


Rich