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Why the reading can not be reset for 200M resistance measurement when the test leads are shorted?

Due to the design of some multimeters, a reference value is needed when measuring large resistance (200M). When the test leads are shorted, a resistance value (such as 1M for a 1999-count multimeter or 10M for a 19999-count multimeter) may be displayed. This value should be subtracted from the measured value to obtain the accurate resistance.

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