XPost: sci.electronics.equipment   
   From: CFKinsey@military.org.jp   
      
   On Thu, 18 Jun 2020 15:38:46 +0100, Pimpom  wrote:   
      
   > 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.   
      
   Thanks, I wonder why all my other meters only list a % error.  Is it included   
   within it somehow, or are they just lying, or do some meters not have this   
   error?   
      
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