programmable Josephson voltage standard ; AC quantum voltmeter ; differential sampling ; sub-sampling ; ac voltage measurement
Zusammenfassung
Differential sampling relative to a Josephson waveform, the ac quantum voltmeter (ac-QVM), has been established as the most accurate method for measuring signals below 1 kHz with an uncertainty of 1 part in 108 (k = 1) for 1 V at 250 Hz. Commercial ac-QVMs provide accuracies of about 1 part in 106 up to frequencies of 2 kHz. Here we present a new sub-sampling technique to extend the frequency range of an ac-QVM up to 100 kHz. The measurement results at 1 V RMS amplitude agree well within 5 μV V-1 (k = 1) with the nominal voltage values for all frequencies from 500 Hz to 100 kHz. Two different analogue-to-digital converters are compared, sampling techniques, error sources and corrections as well as detailed uncertainty estimations are discussed.
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Open Access Hybrid
Themenbereich der Metrologie
Elektrizität und Magnetismus
Zitierung
Behr, R. & Palafox, L. (2021). An AC quantum voltmeter for frequencies up to 100 kHz using sub-sampling. Metrologia, 58(2), 1–12. https://doi.org/10.1088/1681-7575/abe453
