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Meter can be isolated from the circuit in a basic D.C. electronic voltmeter.(a) True(b) FalseI had been asked this question in an interview for job.Question is taken from Basic Electronic Voltmeter in portion Electronic Instruments of Electrical Measurements

Answer»

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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