Discussion
Auto-polarity in a digital voltmeter means that it
Answer: D
Correct answer: displays a minus sign rather than requiring the leads to be reversed
Auto-polarity means the instrument senses the sign of the input and shows it, so the operator need not reverse the leads to read a negative voltage - a convenience an analogue meter cannot offer, since its pointer would simply drive backwards against the stop. Nothing is reversed internally and nothing is rejected.
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