针对多通道电阻信号同步采集的需求，本文设计采用国产单片机GD32F407做主控芯片，国产CL1606做外部模拟量数据采集转换芯片的采集系统，最多可同步采集48路数据。电阻信号经过恒流源电路形成微弱的电压信号，然后经过放大电路放大后输入到A/D芯片中转化成数字信号。GD32F407接收到多路通道转换结果分析处理后将各通道数据保存到SD卡中并通过以太网通信发送至上位机。上位机用LabVIEW搭建，可以将不同通道的数据变化以波形形式同时呈现出来。经实验验证，设计的可扩展多通道采集系统最大误差小于2%，可满足绝大多数应用场合采集精度需求。
In response to the needs of synchronous acquisition of multi-channel resistance signals, an acquisition system using domestic single-chip GD32F407 as the main control chip and domestic CL1606 as an external analog data acquisition and conversion chip was designed, which can simultaneously acquire 48 channels of data. The resistance signal forms a weak voltage signal through the constant current source circuit, and then is amplified by the amplifying circuit and input into the A/D chip to be converted into a digital signal. GD32F407 receives the analysis and processing of the multi-channel conversion result and sends it to the master computer through the Ethernet port. At the same time, the data of each channel is saved to the SD card. The master computer is built with LabVIEW, which can simultaneously present the data changes of different channels in waveform form. Experimental verification shows that the designed scalable multi-channel acquisition system has a maximum error of less than 2%, which can meet the acquisition accuracy requirements of most applications.
