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generally transmitter power supply having some range(12v to
35v) but the out put(4-20 mA) must same for given input.If
we vary the power supply voltage then output mA also to be
change according to V=IR. Is there any voltage regulator
in the transmitter ?
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Answer Posted / kyle condran
Transmitters act as a current source so the voltage drop across the Tx will change anyway in order to provide the correct current out. As long as the supplied voltage is in the range of the Tx, ie enough to power the unit and drive the signal, it will not affect the signal.
Ohms law get tricky when there is a "constant" current source in the loops
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