Hi，I measuremented 4-20mA current signal using CompactRIO NI9063 RT-controller and NI9207 module。The attachment are the Vi and the Circuit diagram。But I read the current value is error（actual signal is 4mA，but the Vi indicate is 0.0039），Anyone know the reason?
Solved! Go to Solution.
Probably the software is already doing a conversion step somewhere. In a 4-20 mA system 4mA is a zero reading from the sensor.
I have solved the problem。Beasue NI9207 read the signal unit is A, so the data need to multiply by 1000 to convert mA。