/products/manufacturers/digilent/b/blog/posts/measuring-4-20-ma-current-with-a-digilent-daq-deviceThe 4-20 mA current loop interface came about because of the need to transmit information over long distances. System designers found that instead of a changing a voltage signal [that is susceptible to noise and voltage drops along the wires]they couen-USTelligent Community 12