4-20mA loop voltage to high
So, how can i reduce the voltage below 10v, and still be able to read
  the current? i was thinking to use resistors, but i do not know what
  resistors to use.


The standard load resistor for a 4/20 mA loop is 250 ohms. This will give a peak voltage of 5 volts across the DAQ inputs for 20 mA. I'd use a quarter watt resistor to be safe on power.



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