Help me understand meter specs

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SmoggyTurnip

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I am looking to buy a multimeter so I am comparing the specs of some different models. It occured to me after some time that I really don't understand exactly what the specs mean. For example for the Fluke 15B meter resistance measurement we have:

Resistance :400 / 4K / 40K / 400K / 4M / 40M Ohm, +/-0.5%+3, 0.1 ohm to 40Mohm

So lets say I am measuring resistor and the meter reads 1000 ohms. Does that mean that the accuracy is:

+/- (.005*1000 +3*.1) = +/- 5.3 ohms or,
+/- (.005*4000 +3*.1) = +/- 20.3 ohms or,

something else?
 

No it means that the 1K is measured at .5 % = +- 5 ohms plus an added 3 ohms (?) so its 1003 +- 5. I believe that you have read (or Fluke have written) its spec badly. I would have presumed that what they actually mean that at the extreme ranges, its accuracy degrades to +-3%. So for 1K its would be within 5 ohms, for 10 ohms its within .3 ohms.
Frank
 


I sent an e-mail to Fluke and they responded by sending me a pdf file with a very good description of how to read the meter specs.
I
have attached it here (I think ... I never uploaded an attachment before).
 

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  • DMM Specifications 4-12-05.pdf
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