From: martin_ridd@verizon.net   
      
   On Sat, 3 Feb 2018 09:59:35 -0500, M Philbrook   
    wrote:   
      
   >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..   
   >   
      
   His inverter may be Quasi Sine wave. Not exactly 50% duty cycle.   
      
   Cheers   
      
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