4-20mA信号はどのように劣化するのか
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圧力、流量、液位などの計器変換器の出力：4-20mA信号はどのように生成されるのか、主な回路素子には何が使われるのか？
4-20mA信号とは、トランスミッターが測定対象の信号をその回路を通じて変換・増幅し、一定電流の4～20mA出力にするもので、トランスミッターは一定電流源と見なすことができます。
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