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Input impedance of an electronic voltmeter is ________(a) low(b) high(c) medium(d) zeroThe question was posed to me at a job interview.This intriguing question comes from Basic Electronic Voltmeter in section Electronic Instruments of Electrical Measurements

Answer»

Right option is (b) high

The best I can explain: In an electronic voltmeter, the INPUT impedance is maintained very high. This is achieved by MAKING use of an FET (Field Effect Transistor) at the input of an electronic voltmeter.



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