A voltmeter relative error is a measure of the accuracy of a voltmeter when compared to the true value of the measured voltage. It is expressed as a percentage or decimal value and indicates the difference between the measured value and the actual value.
Voltmeter relative error is calculated by taking the difference between the measured value and the actual value, dividing it by the actual value, and then multiplying by 100 to get a percentage. The formula is: (Measured Value - Actual Value) / Actual Value * 100.
Yes, voltmeter relative error can be negative. This occurs when the measured value is less than the actual value, resulting in a negative percentage. This indicates that the voltmeter is reading lower than the true value.
Computer control can help reduce voltmeter relative error by eliminating human error in reading and recording measurements. It also allows for more precise and accurate measurements to be taken, resulting in a lower relative error.
An acceptable range for voltmeter relative error may vary depending on the specific application and industry standards. However, in general, a relative error of less than 5% is considered acceptable for most measurements.