The effect of time-jitter in equispaced sampling wattmeters

This paper evaluates the effect of time-jitters in the equally spaced sampl ing wattmeters on the hypothesis of jitters uncorrelated with the input sig nals, The general case of two distinct time-jitters is considered, one comm on to the two channels and the other different for each one of them, The pe rformance of the wattmeter has been evaluated by considering the asymptotic statistic parameters of the output. It has been shown that the different t ime-jitters introduce a bias and that both time-jitters contribute to the v ariance of the output, In any case, time-jitters introduce further bandwidt h limitations which must be taken into account in the wattmeter accuracy ev aluation. The theoretical results have been compared with simulated and exp erimental findings. Experimental results were obtained with a prototype in which both common and different time-jitters were separately added to the e qually spaced sampling instants of the two input channels, In both cases, a ll the results were in good agreement with theoretical expectations.