XPost: sci.electronics.equipment   
   From: CFKinsey@military.org.jp   
      
   On Wed, 24 Jun 2020 21:06:04 +0100, Rich  wrote:   
      
   > In sci.electronics.equipment Commander Kinsey    
   wrote:   
   >> 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.   
   >>   
   >> 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?   
   >   
   > One generally finds the percentage plus digits error measures on more   
   > expensive equipment.  Less expensive equipment more often than not only   
   > lists a percentage and nothing more.   
      
   So should I assume the cheaper ones are lying?  Or have they just made a rough   
   estimate adding the two errors?   
      
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