描述
干扰电压幅值较高的情况下，由于没有足够的能量，仍不能使发光二极管发光，从而可以有效地抑制掉干扰信号。由于光电耦合器的线性区一般只能在某一特定的范围内，因此，应保证被传信号的变化范围始终在线性区内。为了保证线性耦合，既要严格挑选光电耦合器，又要采取相应的非线性较正措施，否则将产生较大的误差。
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