Comparisons of the Josephson array voltage standard of the Bureau International des Poids et Mesures (BIPM) were made with those of the Swiss Federal Office of Metrology (OFM), Wabern, Switzerland, in November 1992 and of the Nederlands Meetinstituut-Van Swinden Laboratorium (NMi), Delft, the Netherlands, in March 1993. Direct and indirect comparison results indicate agreement between the voltage standards to within 1 nV.
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