Direct comparison between the NIST 10 V Compact Josephson Voltage Standard and the 2.5 V Programmable Josephson Voltage Standard
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The NIST 10 V Compact Josephson Voltage Standard (CJVS) and 2.5 V Programmable Josephson Voltage Standard (PJVS) were directly compared at 1.018 V and 2.511 V in February 2007. The difference between the two systems at 1.018 V (CJVS — PJVS) was −0.09 nV with an expanded uncertainty of 4.72 nV or a relative uncertainty of 4.64×10−9 at the 95 % confidence level where as the difference between the two systems at 2.511 V was 0.00 nV with an expanded uncertainty of 4.04 nV or a relative uncertainty of 1.61×10−9 at the 95 % confidence level. These intercomparison results demonstrated the satisfactory performance of the CJVS system handling minor trapped flux in the array and the effectiveness of the “NISTVolt software” to manage step jumps in the measurements.
KeywordsRelative Uncertainty Bias Current Voltage Step Device Under Test Bias Source
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