Comparison of the Josephson voltage standards of the INTI and the BIPM (part of the ongoing BIPM key comparison BIPM.EM-K10.a)

A comparison between the Josephson array voltage standard of the Bureau International des Poids et Mesures (BIPM) and that of the Instituto Nacional de Tecnologia Industrial (INTI), Argentina, was made at the level of 1.018 V in November 2011. For this comparison, both options of the BIPM.EM-K10.a comparison protocol were applied (A and B). Option B required the BIPM to provide a reference voltage for measurement by the INTI using its Josephson standard and measuring device. Option A required the INTI to provide a reference voltage for measurement by the BIPM using its analogue detector and associated measurement loop. In each case the BIPM array was kept floating from ground. The final result observed is in good agreement with the combined relative standard uncertainty of 1.98 parts in 10... for the nominal voltage of 1.018 V. (ProQuest: ... denotes formulae/symbols omitted.)