Progress in Superconductivity

한국초전도학회 (The Korean Superconductivity Society)
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10의 -10승 수준에서 조셉슨 전압표준기 불확도 평가

Uncertainty Evaluation of Josephson Voltage Standard in the level of $10^{-10}$

  • Kim, K.T. (Korea Research Institute of Standards and Science) ;
  • Kim, M.S. (Korea Research Institute of Standards and Science) ;
  • Chong, Y. (Korea Research Institute of Standards and Science) ;
  • Kim, W.S. (Korea Research Institute of Standards and Science) ;
  • Song, W. (Korea Research Institute of Standards and Science)
  • 발행 : 2007.10.31
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초록

The most recent improvement in the 10 V array system was carried out with focusing on noise reduction. We have evaluated the uncertainty of the 10 V Josephson array system after the improvement. The uncertainty evaluation of 10 V standard included a comparison with a programmable Josephson array system at 1 V. Every contribution to the measurement uncertainty was evaluated in the level of $10^{-10}$. The estimated combined uncertainty was found to be approximately $10^{-9}$ at 10 V, which was limited only by the indirect verifying method. In the near future, a direct comparison with another 10 V Josephson voltage standard is expected to be carried out to provide more accurate uncertainty evaluation for the KRISS Josephson voltage standard.

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