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I am unsure of how to interpret the uncertainty given for a Multimeter I have been using. Everything is listed as follows ±(0.8%+10). I have never seen uncertainty listed this way, with a +"x" after the percent uncertainty. What range does this correspond to exactly, -10.8% to 10.8% or is it -0.18% to 0.18%? Here is a link to the datasheet: Digital Multimeter Datasheet. Thanks!

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  • $\begingroup$ Correct me if I am wrong, but I believe it is a relative and absolute error. For example you measure 200 V, then the uncertainty is 0.008×200+10=11.6 V. However that 10 might also be in mV, but it should be specified in the manual. $\endgroup$ – fibonatic Sep 8 '16 at 23:41
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It means that there are two parts to the error. One part is proportional to the reading (0.8%), and the other part is a absolute error (10).

For example, if a reading is 174, then there is 174 x 0.8% = 1.4 proportional error, plus the 10 fixed error for a total error of 11.4. A reading of 174 therefore means the actual value is in the range of 162.6 to 185.4.

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