Abstract
A bilateral comparison of high-vacuum primary standards at the Korea Research Institute of Standards and Science (KRISS) and the Electrotechnical Laboratory (ETL, Japan) was performed in the nominal range 0.004 Pa to 0.013 Pa using two spinning rotor gauges (designated 5 and 7) as transfer standards. The accommodation coefficients, sigma, of the two rotors determined by the two laboratories in an argon atmosphere agreed to within 2 parts in 103 for rotor 5 and 3.8 parts in 103 for rotor 7. This agreement is within the combined uncertainties (k = 1) of the primary standards at the two laboratories.
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