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Abstract
Comparisons of the 1 V Josephson array voltage standard (JAVS) of the D.I. Mendeleyev Institute for Metrology (VNIIM), Russia, with that of the Physikalisch-Technische Bundesanstalt (PTB), Germany, were carried out in St. Petersburg in June 1999. The results of the direct comparison agree within an overall standard uncertainty of less than 1 nV. The results also show that direct comparisons are useful for detecting voltage offsets of a few parts in 10/sup 10/. The reason for a small voltage offset in an SIS array was investigated at zero voltage level.
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