On an object study for measuring result of mechanical thermohygrograph, this paper discussed the source of error and uncertainty evaluation on humidity measuring result of mechanical thermohygrograph.
以机械式温湿度计测量结果为研究对象，论述了机械式温湿度计湿度测量结果的误差来源及其测量不确定度的评定。
Sensor's error caused by temperature and humidity could be compensated by choosing temperature and humidity as input components of the PCA model.
把温湿度信息作为PCA输入分量，能较好补偿温湿度造成的传感器误差。
Considering the importance of sonic nozzles in the field of gas flow measurement, a suitable humidity correction method is required in order to eliminate the systematic error.
鉴于音速喷嘴在我国气体流量计量领域内的重要地位，为消除系统偏差，需要确定适合我国的湿度修正方法。
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