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Input impedance of a DVM is ________

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Input impedance of a DVM is ________

(a) low

(b) zero

(c) high

(d) medium

The question was posed to me during an interview.

My question is based upon Performance Parameters of Digital Voltmeters topic in section Electronic Instruments of Electrical Measurements

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The correct choice is (c) high

For explanation I would say: Typical input impedance of a DVM is usually very high. Typical value is of the order of 10 MΩ. This is usually done in order to reduce the loading effect.

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