Current measurement using SCXI1122

[boy-IR]

Does anybody know how much resistance (Ohms) will be added into the loop if I use SCXI 1122 to measure a <4ma Current signal?

[hoffiz]

Hi,

This is a high impedance input board. If you take a look in the SCXI-1122 User Manual page A-2, you will see that the input impedance of the card is 1G ohm for gains grater or equal than 1 and 1M ohm for gains less that 1. Since this is not a current measurement device you still have to drive a resistance and measure the voltage drop across it, through our SCXI 1122 module. Here are some articles for future references: How to Minimize Errors for Low-Current Measurements and DC and AC Current Measurements

I hope it helps