目的与实际工作结合,研究获得较小重复性的活塞压力计活塞有效面积的测量和不确定度评定方法。方法对各量程的活塞进行实验,和对结果进行评定,并用该结果与溯源结果进行对比,分析其得到的不确定度的可靠程度。结果通过分组测量的方法,得到了较小的重复性,且结果具有较高可信度。结论利用分组测量方法在保证结果科学可靠的同时,减小了测量重复性。 Purpose and practical work combined with the study to obtain a smaller repeatability of piston piston pressure gauge effective area measurement and uncertainty assessment method. Methods Pistons in different ranges were tested, and the results were evaluated. The results were compared with the results of traceability, and the reliability of the obtained uncertainty was analyzed. The results obtained by the method of grouping measurement, smaller repeatability, and the results with higher credibility. Conclusion The method of group measurement reduces the repeatability of measurement while guaranteeing that the result is scientific and reliable.