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Accuracy comparisons of Josephson array systems (voltage standards)

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5 Author(s)
R. L. Steiner ; Nat. Inst. of Stand. & Technol., Gaitherburg, MD, USA ; A. F. Clark ; C. Kiser ; T. J. Witt
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Five Josephson-array voltage standard systems were compared using several different methods. All of the tests were performed on a site at a 1.018-V level, either by direct connection or through successive measurements of independent voltage sources. The resulting agreement between different systems measuring the same source was generally better than 10.0 parts in 10/sup -9/, limited by source noise and detector resolution. Direct array-to-array comparisons for independent systems achieved agreement to within random uncertainties of 0.2 parts in 10/sup -9/. The basic conclusion is that Josephson-array voltage standard systems can be readily transported and tested to assure one-site equivalence. Also, these tests can be done quickly and with high precision, limited by the detector noise if directly compared, or by the transfer reference noise if done indirectly.<>

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IEEE Transactions on Applied Superconductivity  (Volume:3 ,  Issue: 1 )