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| The Effective Area and Distortion Coefficient of CCM. P-K13 Transfer Standard and the Analysis of Uncertainty |
| YANG Yuan-chao,YUE Jin,LI Yan-hua |
| National Institute of Metrology, Beijing 100013, China |
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Abstract 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 mm2 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.
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2011, Vol. 32 
