Abstract
We have evaluated the uncertainty in the differential sampling measurement of the rms amplitude of 10 V waveform synthesis based on an ac programmable Josephson voltage standard system with a compact cooler and a modified digital voltmeter (DVM). The error due to a sampling DVM timer is much reduced with an external 20-MHz frequency reference for the sampling DVM. The thermal electromotive force voltage of our reverse-polarity relay switch is sufficiently small and stable for the application of a differential sampling system. We have also performed a variety of measurements to evaluate this differential sampling technique. The evaluation results show that the overall expanded uncertainty is 1.3 parts in $10^{6}$ ( $k = 2$ ) for the frequency of 62.5 Hz at an rms amplitude of 10 V.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call