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The aim of this paper is to describe the set-up of a new two-terminal cryogenic current comparator (CCC) at the Instituto Nacional de Tecnología Industrial (INTI), Argentina. This new bridge improves our uncertainties in high value resistor measurements up to four hundred times in the best situation. Expanded uncertainties of 0.01 µΩ/Ω can be obtained to resistors of 1 MΩ or 10 MΩ and 1 µΩ/Ω to 1...
This paper describes the design, built and characterization of a resistive voltage divider to compare the 10 V solid state voltage standards output directly with a 1V-Josephson voltage standard. A recent comparison with BIPM exhibits an agreement of 0.024 μV/V with a combined uncertainty uc = 0.04 μV/V.
We have designed and fabricated a set of twelve high value standard resistors of 10 MOmega, 100 MOmega and 1 GOmega nominal values. A subset of three of them were measured at NIST during January, 2008, showing to have good stability and design, a short settling time and an important voltage coefficient.
We describe a cryogenic current comparator (CCC) bridge for resistance scaling that provides improved measurement uncertainty over a range of resistance values from 100 kOmega to 1 GOmega. This CCC is designed for high resistance scaling based directly on a quantized Hall resistance (QHR) standard as well as comparisons of resistance ratios of 1, 10 and 100. The QHR-to-decade-value winding ratio offset...
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