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	Sanwa Electric Instrument Co., Ltd.	Sanwa Electric Instrument Co., Ltd.

How to calculate tolerances in voltage measurements

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Question
How to calculate tolerances in voltage measurements
Answer
A typical analog tester has ±3% of tolerance against its maximum scale value (full scale). For example, when the maximum scale value is 300V, the tolerance is ±9V (=300V*±3%). When the pointer indicates 250V, the true value is in the range of 241V to 259V, and when the pointer indicates 100V, the true value is in the range of 91V to 109V.