XPost: sci.electronics.equipment   
   From: nobody@nowhere.com   
      
   On 6/18/2020 6:33 PM, 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?   
   >   
      
   If your meter should read, say 1.875 A, the correct reading could   
   be anywhere from 1.872 to 1.878. This is a possible error in the   
   display presented to you in the analog-digital display conversion   
   process. The +/-1.9% possible error is about the measurement   
   taken including - but not only - any error made by the sensor.   
      
   To put it another way: If the actual current is 1.875 A,   
   inaccuracies in the sensor and associated circuits may process it   
   as somewhere between 1.875 A +/-1.9%. The analog-digital process   
   may introduce a further error of +/- 3 counts in the least   
   significant display digit. Therefore a current of 1.875 A may be   
   displayed as anywhere from 1.836 to 1.913 A.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)