From: whit3rd@gmail.com   
      
   On Wednesday, June 24, 2020 at 1:03:56 PM UTC-7, Rich wrote:   
   > 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).   
      
   That's not the whole story; the percentage part is often a percentage   
   of the FULL RANGE to which the instrument is switched.   It represents some   
   absolute errors (offset voltages) which include  slow drifts.   Resolution   
   in excess of that percentage error is useful only in close-timed determinations   
   relative to the amplifier or reference drift and ageing.   
      
   --- SoupGate-Win32 v1.05   
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