CCM．P—K13传递标准的有效面积和形变系数及不确定度分析

The Effective Area and Distortion Coefficient of CCM. P-K13 Transfer Standard and the Analysis of Uncertainty

介绍了500MPa表压国际关键比对（CCM．P-K13），其传递标准是名义有效面积为2mm。的活塞式压力计。通过压力平衡实验，测量了传递标准在10个压力点下的有效面积值。不同压力下的有效面积具有不同的不确定度，而且有一定的相关性，采用考虑了异方差和相关性的一般化最小二乘法计算了传递标准零压下的有效面积和压力形变系数，分析了它们的不确定度。

The international key comparison of CCM. P-K13 for 500 MPa range of hydraulic gauge pressure is described, and a piston pressure gauge with 2 mm^2 nominal effective area used as a transfer standard is studied. The effective area of the transfer standard is determined at 10 different pressure points through cross-float equilibrium experiments. The effective areas at different pressures have nonuniform uncertainties and correlations with each other. The zero-pressure effective area and pressure distortion coefficient are calculated using generalized least square （GLS） method with heteroscedasticity and correlation being considered, and their uncertainties are analyzed.