A precision comparison between the Josephson series-array voltage standards of the Danish Institute of Fundamental Metrology (DFM) and of the Physikalisch-Technische Bundesanstalt (PTB) has been made at the one volt level by calibrating the same Zener reference standard with both instruments. Within 2.5 nanovolts (1 σ), the same reference voltage has been obtained from the experiments. The calibrated Zener instrument has at the same time been used to measure the average output voltage of the PTB's main group of Weston cells.
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Niemeyer et al. (1990) studied this question.
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