Comparisons of the Josephson array voltage standard of the Bureau Inte
rnational des Poids et Mesures (BIPM) were made with those of the Swis
s 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 comparis
on results indicate agreement between the voltage standards to within
1 nV.