10 V Programmable Josephson Voltage Standard and its Application in Direct Comparison with the Conventional Josephson Voltage Standard
Yi-hua D. Tang, James Wachter, Alain Rufenacht, Gerald J. FitzPatrick, Samuel P. Benz
This paper briefly describes the working principle of the 10 V programmable Josephson voltage standard (PJVS) that was developed at the National Institute of Standards and Technology (NIST) and how to use it in a direct comparison with a conventional Josephson voltage standard (JVS). Manual and automatic comparison methods were developed to verify the agreement between the two types of Josephson standards. A 10 V PJVS provided by the National Aeronautics and Space Administration (NASA) was used as a transfer standard in the 2014 JVS Interlaboratory Comparison (ILC) that is organized by the National Conference of Standard Laboratories International (NCSLI). The results of automatic direct comparisons between a NASA PJVS and three conventional JVS (CJVS) are reported. Allan variance is applied to analyze the large number of data for Type A uncertainty.
IEEE Transactions on Instrumentation and Measurement