The 2014 North American Josephson Voltage Interlaboratory Comparison

摘要

The 10th North American Josephson voltage standard (JVS) interlaboratory comparison (ILC) at 10 V was completed in 2014. This year's ILC was unique as it consisted of 2 parts. An on-site comparison was conducted between the National Institute of Standards and Technology (NIST) compact JVS and the pivot laboratory's conventional JVS (CJVS) system. A set of four traveling Zener voltage standards then served to transfer traceability from the pivot laboratory to the 12 other participants. In addition to the regular ILC activities, a second on-site comparison was conducted between the NIST compact JVS and the programmable JVS (PJVS) provided by the National Aeronautics and Space Administration (NASA). Due to limited availability of the PJVS, only two labs were selected to make direct comparison between their CJVS systems and NASA's PJVS. The method has been used for the first time in the JVS ILC and has the advantage of using the PJVS as a transfer standard. This allowed the participating lab to make comparisons using its CJVS system against the 10V PJVS in the same manner as the measurements for Zener standards are performed while overcoming limitations of the Zener noise. We give the results from the 2014 ILC.