If I use 500 meters 4-20mA current loop in an outdoor environment, does it matter whether I use single ended or differential ended data acquisition inputs?
I know that for voltage signals differential ended inputs are good to reject common mode interference.
Below is the current loop measurement I'm talking about with a shunt resistor:
As in the above diagram, if the sensor is a 4-20mA loop and converted to voltage at the DAQ side by a 250 Ohm shunt resistor and coupled to the DAQ input as voltage, is there any advantage to using differential ended inputs?
Here is the two options single and diff ended inputs for several current loops:
Above there are 3 current sensors hooked up for both single ended(Figure1) and diff ended(Figure2) data acquisition board channels. If I have many sensors that way, would using diff ended make any difference in this case in terms of interference noise immunity? (I know if the signals were transmitted as voltage it would have big impact but I dont know the current case)