Indirect comparison of 10 V Josephson array voltage standards between the UME and BNM-LCIE

The results of a bilateral comparison of 10 V Josephson array voltage standards of the Ulusal Metroloji Enstitusu (TUBITAK-UME, Turkey) and the Bureau National de Metrologie-Laboratoire Central des Industries Electriques (BNM-LCIE, France), in the framework of EUROMET Project No. 469, are reported. A set of four Zener-diode-based voltage reference standards (Fluke 732B), delivered by the UME, was used as a transfer standard between the two laboratories. The results show an agreement within 97 nV with an overall uncertainty (1 sigma) of 98 nV.