[Solved] The principle on which vector voltmeter is based is

Q.	The principle on which vector voltmeter is based is
A.	that it works on the principle of complex variation
B.	that it measures the response of linear ramp voltage
C.	same as digital meter
D.	that it measures the amplitude of a single at two points and at the same time measures their phase difference
Answer» D. that it measures the amplitude of a single at two points and at the same time measures their phase difference

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