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Meter can be isolated from the circuit in a basic D.C. electronic voltmeter.

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Meter can be isolated from the circuit in a basic D.C. electronic voltmeter.

(a) True

(b) False

I had been asked this question in an interview for job.

Question is taken from Basic Electronic Voltmeter in portion Electronic Instruments of Electrical Measurements

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The correct option is (a) True

To elaborate: Field effect transistor (FET) acts as a source follower and provides very high input impedance. BJT along with resistors form a balanced bridge circuit. As a result the meter circuit can be isolated from the main circuit.

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