Description
长线传输干扰:在计算机控制系统中,现场信号到控制计算机以及控制计算机到现场执行机构,都需要一段较长的线路进行信号传输,即长线传输。对于高速信号传输的线路,即在高频信号电路中,多长的导线可作为长线,取决于电路信号频率的大小,在有些情况下,可能1m左右的线就应作为长线看待。
信号在长线中传输会遇到三个问题:一是高速变化的信号在长线中传输时出现的波反射现象,二是具有信号延时,三是长线传输会遇到外界干扰。
New Honeywell TDC 3000 High Level Analog Output Card
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