Abstract:
This paper describes a 10 V Josephson Voltage Standard (JVS)direct comparison between the National Institute of Standards and Technology (NIST) and the Instituto Nacional de Metrologia, Normalização e Qualidade Industrial (Inmetro)using automatic data acquisition. The results were in agreement to within 1.1 nV and the mean difference between the two JVSs at 10 V is 0.54 nV with a pooled combined standard uncertainty of 1.48 nV. Considering a recent JVS comparison between NIST and the Bureau International des Poids et Mesures (BIPM) [1], the difference between Inmetro and the BIPM thus was found to be −0.26 nV with a standard uncertainty of 1.76 nV.
