Is it possible to acquire a differential analog voltage with RIO Evaluation Kit?

[jesLVbcn]

Hi all,

I'm working with the RIO Evaluation KIT that uses sbRIO-9637 as chassis. I need to measure the temperature using a K-Type thermocouple. Because the expected voltage from the sensor is low (1mV to 4 mV), I should measure in differential mode with the lowest possible range.

From the user manual of the sbRIO-9637 I know that the differential voltage analog input is available (AI0 as positive terminal and AI8 as negative terminal for example) and the lowest input range is -1V to +1V with 32uV of resolution, good data. But the daughter board above the chassis only has single-ended analog input channels (AI0:AI5).

My question is: Can I measure the analog differential voltage from the k thermocouple with RIO EVAL KIT?

Thank You!

[IKERSE · Accepted solution]

Hi jesLVbcn,

the sbRIO analog inputs are not designed to measure thermocouples, so an external conditioning circuit is needed to measure this kind of sensors.

Regards,