1.Chengdu University of Technology, Chengdu, Sichuan 610059, China
2. National Institute of Metrology, Beijing 100029, China
3.Suzhou Institute of Measurement and Testing Technology, Suzhou, Jiangsu 215128, China
4.Guangzhou Institute of Measurement and Testing Technology, Guangzhou, Guangdong 510030, China
Abstract Base on the onsite thermometer calibration with the temperature scale calibration technology, the small-size eutectic point Ga-Sn (20.5 ℃) with a portable automatic realization device are developed to use for the precision platinum resistance thermometer in the industrial site calibration. The results show that the eutectic point temperature plateau sustainable time 2.4 h, which varies by less than 20 mK within 15 minutes, reproducibility result is 4.3 mK. Analysis of experimental results are summarized in two kinds of practical calibration method - comparison and point method, reproducibility of two methods is less than 5 mK.
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2015, Vol. 36 
