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How is error in measurement reduced?

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How is error in measurement reduced?

(a) using r.m.s value

(b) using absolute value

(c) using peak to peak value

(d) using a voltmeter

I got this question during an online interview.

Query is from CRO Measurements topic in portion Oscilloscopes of Electrical Measurements

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Correct answer is (c) using peak to peak value

To explain: In a Cathode Ray Oscilloscope, the error in measurement is reduced by making use of the peak to peak value.

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