XPost: sci.electronics.equipment   
   From: rich@example.invalid   
      
   In sci.electronics.equipment Commander Kinsey  wrote:   
   > I just bought an amp clamp meter, and it states the error is "+/-   
   > 1.9% + 3 digits".  What does the "3 digits" part mean?   
      
   The "3 digits" part is a measure of absolute error (i.e., the amount of   
   error that does not depend upon the magnitude of the value being   
   measured).  The percentage part is a measure of relative error (i.e.,   
   the amount of error that does depend upon the magnitude of the value   
   being measured).   
      
   So if you clamp around a wire and get a reading of 1.234A on the   
   display, then the actual current in the wire could be anywhere within   
   this range:   
      
     1.234 +/- (1.234 * 0.019) +/- 0.003   
      
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