Bilateral comparison of 10 kΩ resistance standards between KRISS and the BIPM

This paper reports the results of an ongoing bilateral key comparison at 10 kΩ resistance standards between KRISS and the BIPM. Two 10 kΩ travelling resistance standards of the BIPM were measured at KRISS against a 100 Ω transfer standard by using a homemade cryogenic current comparator (CCC) bridge system. The value of the transfer standard resistor maintained at KRISS is calibrated against the quantized Hall resistance at plateau i = 2 using the same CCC. The measurement result shows that the equivalence of about -1 × 10^-9 in the resistance calibrations between the two institutions is much smaller than the measurement uncertainty of 32 × 10^-9(k=2).