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Realization of quantum Hall resistance standards at KRISS based on a cryogenic current comparator

At KRISS we have recently developed a quantum Hall resistance (QHR) standard system adopting a cryogenic current comparator bridge, a He-3 cryostat with a 12 T superconducting magnet, and a home-made air bath with a temperature stability of 23.000 °C ± 0.005 °C. The performance of the system was verified by calibration of a standard resistor 100 Ω against the QHR at plateau i = 2, R<inf>H</inf>(2). The combined relative measurement uncertainty (k = 2) is estimated to be about 3.8×10<sup>−9</sup>.