Circuit design on meteorological signals of high precision voltage-mode
Xu Wei1,2,Xing Hongyan1,2
1.Jiangsu Technology & Engineering Center of Meteorological Sensor Network,Nanjing University of Information Science and Technology,Nanjing 210044; 2.Jiangsu Key Laboratory of Meteorological Observation and Information Processing,Nanjing University of Information Science and Technology,Nanjing 210044
Abstract：According to the characteristics of signals outputted by voltage-mode meteorological sensors(humidity sensor HMP45D,radiation sensor TBQ-2B and the PTB220 series barometer),be centered on low energy processor,late-model DAC as well as signal conditioner of low offset voltage,a type of circuit that can not only generate programmable high-precision meteorologic signals but simulate output signals of a sensor is designed,which provides standard signal sources for the fault judgment and detecting of collectors.The precision of analog signals is improved by respectively adopting bus isolation,power isolation and software compensation.Tests show that the stability of circuit and the high-precision are guaranteed and the errors are less than 10 μV.
2014, Vol. 31 
