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Evaluation of measurement uncertainty of humidity standard device based on chilled-mirror dew-point hygrometer

Zhao Shiwei1,2,Wang Xiaolei1,Wang Pengpeng2,Yang Zibin1 (1.Institute of Meteorology,PLA Univ.of Sci.& Tech.,Nanjing 211101;2.Baicheng Weapon Testing Center of China,Baicheng 137001)  
High precision dew-point hygrometer is a high accurate surveying instrument and the general transfer standard for national humidity value and international comparison.Two-pressure humidity generator is also a standard device of transferring humidity value,which can output humidity gas continuously.Many factors of measurement uncertainty appeared in standard device are discussed,when high precision dew-point hygrometer and two-pressure humidity generator are running together.From the working principle of two-pressure humidity generator,the mathematical model is established and measurement uncertainty of humidity standard device is evaluated by the dew-point temperature unit.
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