How is a 4-20mA signal generated?
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Outputs of instruments and transmitters for pressure, flow rate, liquid level, etc.: How is a 4-20mA signal generated, and what are the main circuit components used?
A 4-20mA signal is an output of 4–20mA in which the transmitter converts and amplifies the signal to be measured through its circuitry into a constant current; thus, the transmitter can be regarded as a constant current source.