A comparison of the 10 V Josephson array voltage standard of the Bureau International des Poids et Mesures (BIPM) with that of the Centro Nacional de Metrología (CENAM), Mexico, was made in September 2011. For this comparison, both options of the BIPM.EM-K10.b comparison protocol were applied (A and B). Option B required the BIPM to provide a reference voltage for measurement by the CENAM using its Josephson standard with its own measuring device. Option A required the CENAM to provide a reference voltage for measurement by the BIPM using its analogue detector and associated measurement loop. In both cases the BIPM and CENAM arrays were kept floating from ground.The final results observed were in excellent agreement with the combined relative standard uncertainty of 6.7 parts in 1011 for the nominal voltage of 10 V.Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by the CCEM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

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A comparison of Josephson voltage standards (JVS) between the National Institute of Standards and Technology (NIST) and the Centro Nacional de Metrología (CENAM) held at CENAM from 21 to 23 March 2006 is reported. The comparison was made at the 10 V level by measuring four Zener references using the JVS of CENAM and the transportable Compact Josephson Voltage Standard (CJVS) of NIST. The difference between the measurements was –34.7 nV with an uncertainty of 43.2 nV at 95% level of confidence.Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by the CCEM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).

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