1.

In DVM the common mode rejection noise is eliminated by ________(a) increasing the signal amplitude(b) making use of a resistance(c) using a transformer(d) guardingThe question was asked during an interview.My doubt is from Performance Parameters of Digital Voltmeters in chapter Electronic Instruments of Electrical Measurements

Answer» RIGHT answer is (d) guarding

To EXPLAIN I would say: In a DVM, common mode noise can be eliminated through guarding. A guard is basically a sheet METAL box around the circuit. This is made available to the circuit being measured by making use of a terminal at the FRONT panel.


Discussion

No Comment Found

Related InterviewSolutions