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Calibration system for AWS evaporation sensors

Shao Weijian;LüWenhua;Xing Hongyan;Jiangsu Key Laboratory of Meteorological Observation and Information Processing,Nanjing University of Information Science and Technology;School of Electronic and Information Engineering,Nanjing University of Information Science and Technology;CMA Meteorological Observation Centre;  
In order to solve electrical signal problems of the evaporation sensor existed in the automatic weather station,a kind of analog signal calibration system is designed by means of the analysis and research of evaporation sensor signals of the automatic weather station.Based on the current transmitter XTR116,high precision AD/DA converter and the MSP430CPU as the core,the software program and hardware circuit are developed adopting with the comprehensive measure of software and hardware calibration.The experimental results show that the system is stability and high reliability, and measurement accuracy can reach 0.9%,which can be used for accurate calibration of evaporation sensors current signal output in automatic weather station.
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