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In the multimeter circuit shown in the figure for ac voltage measurement, the function of diode D1 is to
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- provide half wave rectification
- make the recitifier D2 per formfull-wave rectification
- by-pass revers leakage current of D2 in the negative cycle of the input
- short circuit-over range voltages
Correct Option: C
If D1 were not there in the negative half cycle of the applied voltage, there would be some small reverse current through D2 (in the reverse direction) and the meter, there by giving erroneous mean value and hence of the applied voltage. With D1 as in circuit, the current in the negative half cycle flows through Rsh and D1 and there is no voltage across D2 and hence no current through D2.
