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Koikkara
 2 years ago
Why 4ma20ma ?
Koikkara
 2 years ago
Why 4ma20ma ?

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KenLJW
 2 years ago
Best ResponseYou've already chosen the best response.0I suspect the question is in relation to measuring devices and transmission within and control system. Basically you can't use zero because you can't detect a malfunction transmission. The standard industry is 4  20mA and 14 V. A system using these ranges in transmission of temperature, pressure and other system measurements which are relied to control panels and controllers.

KenLJW
 2 years ago
Best ResponseYou've already chosen the best response.0Ideally a output of an electric/electronic circuit can be simulated with a series Thevenin voltage/impedance or it's corollary a parallel Norton/impeadance. The impedances are the same and IN = VTH/impedance. Personally if one is valid so should the other, though I remember some saying the contrary.
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