Reading CJC Voltage directly PXIe TB-4353

[Zdziebko]

Hi,

I am using PXIe 1071 with TB-4353 card for thermocouples' reads. Currently I need to read CJC voltage. The voltage is required by the 'Convert Thermocouple Reading' VI which I am going to use next. 

I am able to read CJC temperature without any problems based on the approach posted here:
https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019N2WSAU&l=pl-PL
I thought that I need only to switch the 'Create Virtual Channel.vi' to AI Voltage, but unfortunatelly the captured value is 0 in this case.

What am I doing wrong? Maybe there is other way to compute voltage based on CJC temp.?

Thanks, Paweł

[santo_13]

You already get it as temperature, any reason you need it as voltage?

[Zdziebko]

The  'Convert Thermocouple Reading.vi' that I am using in my LabView project requires CJC voltage insted of temp.:
https://www.ni.com/docs/en-US/bundle/labview/page/lvinstio/conv_thermcoup_read.html

Paweł

[billko]

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@Zdziebko wrote:

The  'Convert Thermocouple Reading.vi' that I am using in my LabView project requires CJC voltage insted of temp.:
https://www.ni.com/docs/en-US/bundle/labview/page/lvinstio/conv_thermcoup_read.html

Paweł

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It's already converted, so you shouldn't need that VI.  All you would be doing is converting a temperature that was converted from a voltage back into a voltage so you could convert it back into a temperature!