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In industrial environments 4-20mA is a commonly used range of values for a current loop where 4mA represents the lowest value and 20mA indicates the maximum. Some advantages compared to sending a voltage is that the resistance of the cable doesn't affect accuracy and devices may be powered from the same pair of wires.

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I'm currently designing (or at least trying to) a RTD amplifier with ICL and current outputs. What I've got so far is a working RTD and ICL schemes, but I still struggle to design a proper converter …
asked Nov 25 '18 by Kholgar