NPL is procuring a Josephson Arbitrary Waveform Synthesiser (JAWS) primary voltage standard. This is a series array of Josephson junctions in which single pulses of bias current each generate a small but precisely defined quantised voltage across the array. Accurate voltage waveforms are constructed by fast repetition of the pulses with accurately timed intervals between them. In the JAWS system, the output voltage is always precisely defined. This is…

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