International comparisons of Josephson array voltage standards

Abstract

Comparisons of 1-V Josephson array voltage standards provide a good estimate of some of the limiting factors in the uncertainties of such devices. The BIPM has participated in nine such international comparisons. This program was preceded and followed by the comparison of the two BIPM Josephson array devices. A summary of the results, which shows agreement at the level of 1-7 parts in 10/sup 10/, is presented. Some of the problems encountered are discussed.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>