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Series array Josephson voltage standards fabricated from Nb/AI,O,/Nb junctions and generating stable reference voltages up to +15 V have been developed at PTB. The calibration and investigation of the noise patterns of 10-V Zener reference standards, Weston cells, and digital voltmeters are possible. These Josephson voltage standards are also extremely durable.
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Pöpel et al. (1991) studied this question.
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