A 0-200 V voltmeter has a guaranteed accuracy of 1 percent of full-scale reading. The voltage measured by this instrument is 150 V. The percentage limiting error is

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UPSC ESE Electronics & Communication 2022 Official Paper

Answer 1

(0 - 200V) voltmeter

Guaranteed accuracy = ± 1% FSR

\(=± \frac{1}{100}\times 200\)

± 2V

Reading value = 150 ± 2V

% limiting Error \(=\frac{200}{150}= 1.33\% \)

Method 2 :

% limiting error = % Er

\( = \frac{{\% full\,scale\,error \times full\,scale\,value}}{{desired\,value}}\)

\(\% Er = \frac{{1 \times 200}}{{150}} = 1.33\% \)