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Why do some measurements result in a zero reading and the display of awarning triangle and a flashing CAL sign?

April 26, 2017cal display flashing measurements Reading Triangle Zero

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Why do some measurements result in a zero reading and the display of awarning triangle and a flashing CAL sign?

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Test lead calibration has not been performed accurately and the measuredvalue is less than the test lead resistance. The instrument will not display anegative value.Repeat the test lead calibration using CAL mode. See Q2 above and usermanual 4.1.1.