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Why 1-5 vdc a standard?
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Answer Posted / carl_ellis
1-5Vdc is not a standard, it is a widely used convention for 4-20mA current loops.
A 250 ohm resistor drops a 1-5 Vdc voltage proportional to the 4-20mA current.
DCS analog inputs historically used 250 ohms for 4-20mA analog input resistance and over time that value has become quite common.
But I have seen 1 ohm, 4.7 ohms, 10 ohms, 12 ohms, 24.9 ohms, 50 ohms, 62.5 ohms, and 100 ohm resistances for 4-20mA current input.
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