Discussion
Assertion (A): A class 1.0 instrument should be read in the upper part of its range.
Reason (R): Its error is specified as a percentage of full scale.
Select the correct option.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. The class figure fixes the permitted error as a fraction of full scale, so it is a constant number of volts or amperes wherever the pointer sits. Expressed as a fraction of the reading it therefore grows as the deflection falls - 1 per cent at full scale, 5 per cent at a fifth of it.
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