Comparison of the Josephson Voltage Standards of the VNIIM and the BIPM (part of the ongoing BIPM key comparison BIPM.EM-K10.b)

A comparison of the 10 V Josephson array voltage standard of the Bureau International des Poids et Mesures (BIPM) was made with that of the D.I. Mendeleyev Institute for Metrology (VNIIM), Russian Federation, in November 2010. For this exercise, option A of the BIPM.EM-K10.b comparison protocol was applied. This option required the VNIIM to provide a reference voltage for measurement by the BIPM using its Josephson standard with its own measuring device. The BIPM array is kept floating from ground. The final results are in very good agreement with the combined relative standard uncertainty of 2.0 parts in 1010 for the nominal voltage of 10 V.