一种精密多路温度采集系统硬件电路设计

Hardware Circuit Design of High Precision Multichannel Temperature Acquiring System

介绍了一种高精度温度采集硬件电路,系统以MCU为核心,实现了8路高精度温度传感器测量,具有自动校准,恒定电流源输出、自动量程切换,适用于负温度系数(NTC)传感器精密测量,也适应PT100、PT1000、PTC传感器测量,设有RS485异步通讯接口,可实现与上位机通讯,对于传感器的非线性可采用查表和分段线性插值算法校正,保证了高精度检测。

A kind of high precision hardware circuit of multichannel temperature acquiring system is introduced,in the system,the single chip microcomputer MCU is used as core.The system can automatically process 8 channels of high precision temperature sensors signal.It can automatically celebrate,output invariable current supply,automatic range switching.It is suited to precision measurement for adopt NTC(Negative Temperature Coefficient)sensor,also be used for PT100,PT1000,PTC measure,and so on.The system with RS485 asynchronous communication interface,implement the communication with the upper computer.The method of look-up table procedures and the algorithm of piecewise linear interpolation are adopted in nonlinearity correction of sensor,it can assure high detection precision.