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計器信号の4-20ミリアンペア信号は、なぜ0-20ミリアンペアではないのでしょうか
導電性をどうすれば電流をゼロにできるのか、見当がつかない
信号が小さすぎると不安定で、ゼロになってしまうとどうやって電流を流せるのか。
信号のゼロ点と電気的なゼロ点を分離するため。
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