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Differences between AMM and tolerance and DMM accuracy
Differences between AMM and tolerance and DMM accuracy [ Reference URL ]
AMM, permissible tolerance and DMM accuracy are the specifications for measurement value accuracy.

In an analogue tester, the permissible tolerance against the maximum scale value is taken as the measurement error and, in a digital multi-meter, the accuracy against the measurement value is taken as the measurement error.
Examples of some comparisons among current products are given below.
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Analogue type AP33
AC voltage permissible tolerance is within ±5% of the maximum scale value.
■ Where AC 100V is measured within a 250V range, 
the permissible tolerance will be ±12.5V of the measurement value.
-------------------------------------------Digital type PM3
AC voltage maximum accuracy is 2.3% + 5 counts
■ Where AC 100V is measured within a 400V range, 
the measurement error will be ±2.8V against the measured value.
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Posted at:2012-06-13
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