The comparison CCM.P-K15 is a key comparison in pressure involving six laboratories in three regional metrological organizations (RMO). The measurand of the comparison is the accommodation coefficient of two spinning rotating gauge characterized in nitrogen from 0.1 mPa up to 1.0 Pa. The two transfer standards were circulated from November 2009 until March 2011. The circulation consisted of three loops, one for each RMO, and a new calibration by the pilot between each loop. The stability of one of the transfer standards was poor and was worse than expected based on the previous history of the transfer standard while the other transfer standard demonstrated good stability while circulated in Europe and America and a fair stability while circulated in Asia. All the participants demonstrated equivalence to the definition of pressure in their respective primary standards.

中文翻译：

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关键比较的最终报告，CCM.P-K15 在压力范围从 1.0 × 10-4 Pa 到 1.0 Pa

比较 CCM.P-K15 是压力的关键比较，涉及三个区域计量组织 (RMO) 的六个实验室。比较的被测量是两个旋转式旋转规的适应系数，其特征在于从 0.1 mPa 到 1.0 Pa以及飞行员在每个循环之间进行的新校准。其中一个转移标准的稳定性较差，比之前基于转移标准的历史预期差，而另一个转移标准在欧美流通时表现出良好的稳定性，在亚洲流通时表现出一般的稳定性。