9211A USB cjc

[Mugur]

Hello comunity

I am trying to acquire the voltage from a special thermocouple using the USB 9211A module. In Max I see the cjc channel but when I build a vi I can't. I can see though the value of the cjc channel (ina property node) if i switch the channel from voltage measurement to temperature measurement. In this case it is 25 and not a binary or voltage. I would be happy to translate thet value in voltage but it is very rough. I was expecting at least a few commas.

hence the questions: why I can see a fifth chanel in Max (seems to show a voltage value) but in LV I only see four? how to read this channel? Is there any zeroing like in the cRIO case?

Regards,

Yannis

[Tom O]

Hi Yannis,

To read the CJC channel on your USB 9211A in LabVIEW, create a control or constant for the channel name, right click the control/constant and select "I/O Name Filtering...". Check the "Internal channels" checkbox and click OK. This will allow you to see all channels for the device including the CJC channel.

You can also wire a string constant or control into the DAQmx Create Channel block to choose the channel, e.g. "Dev1/_cjtemp".

More information on reading the CJC channel can be found in the following KnowledgeBase article:
http://digital.ni.com/public.nsf/allkb/862567530005F09C8625670A00664B6C?OpenDocument

I hope this is of use to you.

Regards,

Tom

Applications Engineering, NI UK