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- W2211495900 abstract "This paper presents a systematic study of the effects of reversals of current polarity on 1 Ω standard resistors. A selection of 1 Ω standards were measured on a dc cryogenic current comparator bridge and also on an ac current comparator bridge operating at 1 Hz. We find that the apparent 4 terminal resistance depends strongly on the dc reversal rate, in one case showing a variation of more than 0.1 μΩ/Ω for cycle times between 10 s and 1000 s. Even in the best cases, effects of at least 0.01 μΩ/Ω are present. Furthermore, the assumption that the apparent resistance value converges to a limiting value for long waiting times after reversal is not always upheld, making it difficult to quote a simple dc value. Existing models of Peltier heating at wire junctions do not completely explain our observations. The problems presented have been the limiting factor for 1 Ω measurements as part of a recent on-site comparison of quantum Hall effect resistance standards." @default.
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- W2211495900 date "2015-06-16" @default.
- W2211495900 modified "2023-09-26" @default.
- W2211495900 title "Behavior of 1 Ω resistors at frequencies below 1 Hz and the problem of assigning a dc value" @default.
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- W2211495900 doi "https://doi.org/10.1088/0026-1394/52/4/509" @default.
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