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

How to calculate tolerances in resistance measurements

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Question
How to calculate tolerances in resistance measurements
Answer
A typical analog tester has ±3% of tolerance against its scale length (total length of the scale). The scale for voltage/current measurement is an equally divided scale, but the scale for resistance measurement is a logarithmic scale. Therefore, the tolerance varies depending on the measured resistance value. The actual tolerance is obtained from the value on the resistance measurement scale that corresponds to ±3% of the resistance measurement scale length.