XPost: sci.electronics.equipment   
   From: rich@example.invalid   
      
   In sci.electronics.equipment Commander Kinsey  wrote:   
   > 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?   
      
   More likely they simply invested less effort in measuring their   
   respective meters accuracy.  And a generally safe assumption is that   
   lower cost often equates to less accurate.   
      
   > Or have they just made a rough estimate adding the two errors?   
      
   This is likely, but without being able to ask the maker, anything we   
   surmise here is just a guess anyway.   
      
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