From: jamie_ka1lpa@charter.net   
      
   In article ,   
   jurb6006@gmail.com says...   
   >   
   > They are all off base here. Actually I am surprised Phil didn't mention it.   
   >   
   > Compare the readings with the same peak to peak value o a sine wave and a   
   square wave. If they read the same it is not true RMS. If it is true RMS on a   
   square wave it will read approximately ? the P-P value but on a sine wave it   
   will read lower, 0.   
   70711 of ? the P-P value. Almost any meter has the resolution to discern 1   
   volt from 0.71 volt.   
   >   
   > You do have a scope right ? If not you'll have to figure out a way to clip a   
   sine wave. You don't need any power behind it, a Zener or stack  of diodes   
   will do. A scope is the best way though. If you have to wing it come back and   
   I will try to figure    
   out the easiest way.   
      
    you see youy are only partially correct.   
      
    a 50% D square wave form = Vp *  1/sqrt(2)   
      
    a RMS meter does not display 50% as you pointed out.   
      
    but, other references I've ran into will also state that the   
    RMS of a Square wave = VP, but that only applies to one half of the   
   complete cycle.   
      
     Have fun..   
      
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