文章介绍了立式热量表检定装置的基本构造以及工作原理,对检定装置的各不确定度分量进行了分析,并给出了扩展不确定度。针对温差测量引入的不确定度,分别使用了FIR滤波器、平均滤波器、Kalman滤波器对噪声进行了抑制,并且比较了几种滤波器的处理结果,最终采用了平均滤波和Kalman滤波相结合的方式,使得温差检定不确定度从0.272%减小为0.052%,提升了检定结果的可靠性。 The article introduces the basic structure and working principle of the vertical heat meter verification device, analyzes the components of the uncertainty of the verification device, and gives the extended uncertainty. According to the uncertainty introduced by the temperature difference measurement, the FIR filter, the average filter and the Kalman filter are respectively used to suppress the noise, and the processing results of several filters are compared. Finally, the average filter and the Kalman filter are combined Way, making the temperature difference test uncertainty decreased from 0.272% to 0.052%, improve the reliability of test results.