I have an SCB-68 with a 4-20mA signal converted to voltage with resistor to create a voltage drop. In MAX I have a VI property range set for 0-5volts on channel 7 (Referenced Single Ended). With the device off and in Test window I got 0.95Volts. With device on (no-load) I got 3.75Volts. How do I convert this back to Amps? Do I need to use custom scaling (if so how do I do that)? I am measuring large motor current 0-200 Amps. I use LabVIEW 6.1 and a 6024E PCMCIA card in a laptop.
You don't describe your test setup beyond the SCB-68 terminal block, but it sounds like Ohm's Law to me. V=I*R or I=V/R What's the value of your resistor? If it's 0.1 ohms (a high power shunt), I=3.75/.1 = 37.5Amps.
