引言在空调、液面探测和流量控制等大部分工业应用中，压力是一个非常重要的参数。在大多数情况下，传感器在很嘈杂的环境中都紧靠着被测源，离接收器（记录器、计算机、自动控制器等）很远。图带４～２０ｍＡ电流环的压力传感器电路传输线可能长几百米，当信号做为电压传... Introduction Pressure is a very important parameter in most industrial applications such as air conditioning, level detection and flow control. In most cases, the sensor is very close to the measured source in a very noisy environment, far from the receiver (recorder, computer, automatic controller, etc.). Figure 4 ~ 20mA current loop pressure sensor circuit transmission line may be a few hundred meters long, when the signal as voltage pass ...