Evaluation of uncertainty in AC voltage measurement using a digital voltmeter and Swerlein's algorithm

摘要

A model is proposed for a sampling algorithm that uses a high-resolution voltmeter for measuring the RMS value of a sinusoidal voltage waveform. The uncertainty associated with the result of measurement is evaluated according to the rules in the ISO/BIPM guide to the expression of uncertainty in measurement. The standard uncertainty was evaluated to be less than 5/spl times/10/sup -6/ in the 1-1000 V and 1-100 Hz ranges. The uncertainty contribution associated with the conditioner and amplifier frequency response correction is dominant in the high frequency range.