CCT-K7水三相点容器国际关键比对

在国际互认框架内，国家计量标准的国际等效性是通过国际计量委员会（CIPM）的咨询委员会组织的一系列国际关键比对来确定的。温度咨询委员会（CCT）委托国际计量局（BIPM）作为主导实验室组织了由20个国家实验室参加的CCT-K7水三相点容器国际关键比对。比对结果表明：这些国家基准水三相点值在0．171mK范围内一致。此外，为了减小国家实验室复现水三相点的系统差，需要进一步研究同位素组成对水三相点温度的影响以及同位素修正。

CCT-K7 Key Comparison of Water Triple Point Cells

Within the framework of Mutual Recognition Arrangement(MRA),the international equivalence of national measurement standards is determined by a series of key comparisons organized by the Consultative Committees of the International Committee for Weights and Measures(CIPM).Therefore,Consultative Committee for Thermometry(CCT) authorized Bureau International des Poids et Mesures(BIPM) to be a pilot laboratory to organize CCT-K7 key comparison of water triple point cells,participated in by 20 national metrology institutes.The comparison results show that these national reference values of TPW are in good agreement within 0.171?mK.Additionally,in order to reduce systematic differences in realization of TPW among the national laboratories,it is very necessary to further investigate the effects of isotopic composition on the triple point temperature of water,and corrections for isotopic composition.