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What is the significance of the name dual slope method?

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What is the significance of the name dual slope method?

(a) it has two slopes

(b) it integrates the input twice

(c) it uses two inputs

(d) it has two outputs

The question was asked in semester exam.

Origin of the question is Dual Slope Integrating Type DVM in portion Electronic Instruments of Electrical Measurements

1 Answer

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Right answer is (b) it integrates the input twice

Easiest explanation: The input signal is integrated only for a fixed interval of time and this is the basis for the dual slope method. Reference voltage is integrated with a negative slope. Hence the method is known as dual slope integrating type DVM.

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