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A guaranteed accuracy of measuring instrument are within a certain percentage of full scale reading.
Some maker may specify the instrument to be accurate at Β±2% with full scale deflection.
E.g. the accuracy of a 0-100 V voltmeter is specified as 2% of full scale range. It means that error is guaranteed to be within 2V for any reading.
If voltmeter reads as 40V then also the error is within 2V. As a result, the accuracy for this reading will be :
π/ππ π± πππ=π%
Limiting error of an instrument = % of accuracy x full scale
Limiting error of a measurement (%);
(%) = ( (magnitude of limitingerror)/(measurement) ) x 100
Example
Given a 300 V voltmeter with accuracy Β±2% full scale. Calculate limiting error when the instrument is used to measure a voltage of 150 V ?
Answer ;
magnitude of limiting error : = 0.02 x 300 V = 6V
Thus, the limiting error for 150V, = (6 / 150) x 100 = 4%
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1.10 Statistical Analysis
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