Sunday, November 5, 2017

A.C. Voltmeter Using Full Wave Rectifier

       the a.c. voltmeter using full wave rectifier is achieved by using bridge rectifier consisting of four diodes, as shown in the Fig. 1.

        Let 10 V r.m.s. purely sinusoidal input be applied.

       Now this meter uses full wave rectifier and hence the average value of output over a cycle is same as average of the input over a cycle i.e. 9 V.
       Thus, the 10 V r.m.s. voltage is equal to 9 V d.c. for full scale deflection. Thus the pointer will deflect to 90% of full scale.

The multiplier resistance can be obtained as

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