Does built-in cjc supported by daqmx 7.4?

Hello!
I am using pci6251 and 6221 with bnc2120 accessory with built-in cold junction compensation enabled in MAX device properties.
Some time ago we have used DAQmx 7.3 and everything was fine. After upgrade to DAQmx 7.4 in MAX it is possible to select built-in cjc source, but trying test the task results in error like: "property value unsupported", supported only "channel" and "constant".
Is that intended behaviour? If so, why the built-in is in the list of the possible values in MAX?
I understand that it is easy to setup a new channel for CJC only (with voltage*100 degrees C linear scale), but is it possble to use just builtin value of the CJC source with this driver release?
Thanks in advance!

Hi,
Roughly speaking, CJC channel should contain the temperature of the place where thermocouple wires are connected to copper. Various way exist to do it. NI uses the semiconductor temperature sensor which voltage output is 10 mV/oC (it is practically standard among such sensors). (It is very easy and cheap to by yourself such thing if you don't have).
So, you need two channels - one for measuring the thermocouple voltage and second for the sensor output. Then you need to convert both to degrees C and sum them (i.e. sum the thermocouple temperature referenced to cold junction temperature and cold junction temperature itself).
Create one channel on which you will measure temperature of cold junction, add scale to it (offset=0, scale=100) to have results in oC.
Create second channel on which the thermocouple will be connected (sure that it is another channel than CJC :-). Specify the first channel name in the "CJC Channel". It should work.
If your are using the BNC2120 with builtin junction compensation sensor and thermocouple connector, be sure to set the corresponding switches to measure temperature and CJC on the block instead of the BNC.
Hope this will help.
If not, try to search through NI website. There are some appnotes or knowledge base articles describing CJC and thermocouples in details.

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