Question

Why is dual slope method preferred over ramp techniques?

(a) no noise

(b) partial noise

(c) average noise

(d) maximum noise

This question was addressed to me in an interview for internship.

This interesting question is from Dual Slope Integrating Type DVM in portion Electronic Instruments of Electrical Measurements

Answer 1

Correct choice is (a) no noise

To explain I would say: During the process of integration, noise is canceled out by the positive and negative ramps in the dual slope method. The input signal is integrated only for a fixed interval of time and this is the basis for the dual slope method.