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为了提高温度测量精度,设计了一种高精度温度数据采集系统。系统利用24bit A/D转换器ADSl255作为数据采集核心部件,Microchip出品的PIC32Mx5作为核心计算部件以及物理网卡芯片构成。系统利用PIC32Mx795的计算性能,通过牛顿法直接寻找高次方程的温度根,然后通过以太网发送给远程主机。与铂电阻温度计的对比实验结果表明本系统的测量精度优于0.01℃,且工作稳定。
In order to improve the temperature measurement accuracy, a high precision temperature data acquisition system was designed. System uses 24bit A / D converter ADSl255 as the data acquisition core components, PIC32Mx5 from Microchip as the core computing components and physical NIC chip composition. The system uses the computational performance of the PIC32Mx795 to directly look for the temperature root of the higher-order equations by Newton’s method and send it to the remote host via Ethernet. Compared with the platinum resistance thermometer, the experimental results show that the measurement accuracy of the system is better than 0.01 ℃ and the work is stable.