1.11 LIMITING ERROR

LIMITTING ERROR

• The accuracy of measuring instrument is guaranteed within a certain percentage of full scale reading.

• As an example;

Supposed the accuracy of a 0-100V voltmeter is specified as 2% of full scale range. This implies that the error is guaranteed to be within 2V for any reading. If the voltmeter reads 50V, then the error also within 2V. As a result, the accuracy for this reading will be:

(2/50) x 100 = 4%

• Limiting error of an instrument = % accuracy x full scale

• Limiting error of a measurement (%)

= (magnitude of limiting error / measurement) x 100