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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...
We are developing a 10-Vrms low-frequency sampling measurement system using an AC-programmable Josephson voltage standard (AC-PJVS). Our AC-PJVS circuit is composed of NbN-based over-damped Josephson junctions cooled with a compact cooler. A PJVS chip with 524,288 junctions increases the maximum measurable root-mean-square (rms) voltage up to 10 V at a microwave bias of 15.9 GHz. We have obtained...
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