Abstract � In this paper a new estimator for the measurement of the rms value of a noncoherent sampled sine-wave is proposed. The key feature of this estimator is that the sine-wave offset, a priori estimated, is removed from the sine-wave. A formula used to estimate the sinewave offset is also given in the paper. It has been proved by means of computer simulations and experimental results that by the proposed estimator accurate rms measurements are obtained if the total harmonic distortion (THD) of the sinewave is smaller than or equal to �30 dB
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