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为表征某实际使用的0.005级(0.1~6)MPa的活塞式压力计标准量值的分散性,根据活塞式压力计的测量模型,对该标准在6 MPa压力点处的不确定度进行了分析与评定。其中专用砝码的标准不确定度是活塞式压力计标准不确定度的重要分量之一,以E2级砝码为标准,通过ABBA循环测量方法测量了专用砝码的重复性并评定了专用砝码标准不确定度的A类分量,同时与其他B类分量合成得到了专用砝码的标准不确定度为8.3×10~(-6)kg,该结果比通常的单纯B类评定结果小得多,故通常认为的均匀分布的假设与砝码质量的实际分布并不严格相符。因此,该方法评定得到的活塞式压力计标准的不确定度比通常算法的评定结果具有更高的可信度。
In order to characterize the dispersion of the standard value of piston gauge of 0.005 (0.1-6) MPa which is actually used, according to the measurement model of piston gauge, the uncertainty of the standard at 6 MPa pressure point Analysis and assessment. The standard uncertainty of the special weight is one of the important components of the standard uncertainty of the piston type pressure gauge. The weight of the special weight is measured by the ABBA cycle measurement method and the weight of the special weight The standard uncertainty of class A component of code standard uncertainty, combined with other class B components at the same time is 8.3 × 10 ~ (-6) kg, which is smaller than that of simple class B evaluation Therefore, it is generally considered that the assumption of even distribution does not exactly match the actual distribution of weight quality. Therefore, the uncertainty of the piston gauge gauge obtained by this method assessment has higher credibility than that of the general algorithm.