描述
信号地的处理:原则上不允许各变送器和其它的传感器在现场端接地,而都应将其负端在计算机端子处一点接地。但在有些场合,现场端必须接地,这时,必须注意原信号的输入端子(上双端)绝对不许和计算机的接地线有任何电气连接,而计算机在处理这类信号时,必须在前端采用有效的隔离措施。
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