自动气象站采集器的温度通道检定仪  

Desigen of Calibration Instrument for Temperature Channel of Data-acquisition Unit of Automatic Meteorological Station

作　　者：徐伟[1,2] 行鸿彦[1,2] 

机构地区：[1]江苏省气象传感网技术工程中心,南京信息工程大学,江苏南京210044 [2]江苏省气象探测与信息处理重点实验室,南京信息工程大学,江苏南京210044

出　　处：《仪表技术与传感器》2014年第10期40-43,71,共5页Instrument Technique and Sensor

基　　金：江苏省产学研联合创新资金-前瞻性联合研究项目(BY2011112);江苏省普通高校研究生科研创新计划项目(CXLX12_0508);江苏高校优势学科建设工程资助项目

摘　　要：针对ZQZ-JC、JJQ1型气象信号模拟器在自动气象站采集器温度通道检定时存在有源电阻和采集器激励电流不匹配、继电器接触电阻引起误差大的问题,设计一种新型检定仪。程控无源电阻网络四线制分时测量和输出,接触电阻不影响检定结果。内置高精度测量电路,保证系统显示的阻值和实时输出之差小于10 mΩ.采用电源隔离、总线隔离、校准电路等措施保证精度。测试表明,系统模拟的温度信号最大误差为±0.03℃,远低于自动气象站的测量误差±0.2℃,为采集器提供了一种高精度的检定仪器。Aiming at the problems that active resistor mismatches the exciting current and great errors caused by relay contact resistance have existed when using ZQZ-JC or JJQ1 meteorological signal simulator to calibrate temperature channel of data-acquisi- tion unit of automatic meteorological station, a new calibration system was designed in this paper. Time-sharing processing of four- line measurement, output of the passive r6sistance and contact resistances should not affect the calibration outcome. Gap of the re- sistance between the display and actual output was less than 10 mlL Many measures such as power supply isolation, bus isolation and calibration circuit were adopted to ensure the accuracy of the measurement. Tests show that the maximum error of the tempera- ture simulation signal is ＋ O. 03 C, which is far lower than the measurement error ＋- O. 2 ~C of the data-acquisition unit. It provides a high-precision calibration instrument for data-acquisition unit

关 键 词：采集器 温度通道 检定 四线制 

分 类 号：TH71[机械工程—测试计量技术及仪器]