NI Scan Engine, cRIO 9211 and CJC

[viScience]

Does anyone know if the temperature returned by the scan engine uses the CJC and zero offset channels on the 9211?

Thanks 

[Jeremy_B]

Hi sachsm,

The Scan Engine will return calibrated data, so it should already have incorporated the CJC and zero offset channels.

[viScience]

Yes, I agree that it should, but does it actually?

[JMota]

Yes, it does.

JMota

National Instruments - R&D

[Meister]

Just to clarify.

Is the CJC based on a constant temp(25 degress C) or is it measured using a isotermic bloc in the module itself when using the Scan Engine?

Thanks

AMeister

[JMota]

This is what the 9211 user manual says about it.

http://digital.ni.com/manuals.nsf/websearch/A24B9BB284234EDF862571CA00684AC7 

Heat dissipated by adjacent modules or other nearby heat sources

can cause errors in thermocouple measurements by heating up the

terminals so that they are at a different temperature than the

cold-junction compensation sensor used to measure the cold

junction. 

Not sure what the different ways for implementing CJCs are, but is there something that can be inferred by knowing that is a an actual sensor within the module?