Comparisons of 10 V Josephson array voltage standards between the BNM/LCIE and the BIPM

Abstract

An indirect comparison between the 10 V Josephson array voltage standards of the BNM/LCIE and the BIPM has been carried out using Zener-diode based voltage references as transfer standards. The results show an agreement of 5 parts in 10/sup 9/ with an uncertainty (1/spl sigma/) of 3 parts in 10/sup 9/, mainly due to instability of the Zener references. A direct comparison is to be carried out early in 1994 to avoid this limitation.<>