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信号传输的秘密谁还不知道？|为什么只用4-20mA电流传输模拟量？
你有没有注意过，在测量各类非物理量的时候，如温度，压力，速度等等，这些信号都需要转化成模拟量电信号才能传输到几百米开外的控制室或者显示设备上，这些传感器输出的信号大多都是4-20mA的电流，为什么要用这么大的电流信号传输模拟量呢？这是为什么呢？
电子工程师必读小知识18/68
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