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계측기 신호의 4-20mA 신호가 0-20mA가 아닌 이유는 무엇입니까?
전기를 전도하는 한 전류를 0으로 만드는 방법은 찾기 어렵습니다.
너무 작으면 신호가 불안정해집니다. 0이면 여전히 전기를 전도합니다.
신호 영점과 전기 영점을 분리하기 위해.
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