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A 300 V voltmeter has an accuracy of ± 2% of full-scale deflection. When the reading is 222 V, the actual voltage –

A 300 V voltmeter has an accuracy of ± 2% of full-scale deflection. When the reading is 222 V, the actual voltage – Correct Answer lies between 216 and 228 V

Concept:

Limiting error: The maximum allowable error in the measurement is specified in terms of true value, is known as limiting error. It will give a range of errors. It is always with respect to the true value, so it is a variable error.

Guaranteed accuracy error: The allowable error in measurement is specified in terms of full-scale value is known as guaranteed accuracy error. It is a variable error seen by the instrument since it is with respect to full-scale value.

Calculation:

Full scale deflection of voltmeter = 300 V

Accuracy = ±2% of full-scale deflection

Error = ±2% of 300 V = ± 6 V

Measured value = 222 V

Actual voltage = 222 V ± 6 V = lies between 216 and 228 V

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