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Thermocouple to U12


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#1 jstigwood

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Posted 06 November 2013 - 10:39 AM

Hi there,

 

I have a K Type Thermocouple and a U12 - I can't seem to get anything other than 119deg out of this!

 

+ wired to AIO

- Wired to GND (and also tried AI1.

 

Any ideas?

 

Thanks,

 

James



#2 LabJack Support

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Posted 06 November 2013 - 10:57 AM

You will need an amplifier, or move up to the U6 or T7.

 

http://labjack.com/s...erature-sensors

 

http://labjack.com/s...s/thermocouples

 

https://forums.labja...p?showtopic=674    (see posts #6 and #7)

 

The best you can do with a direct connection to the U12 is to connect + to AI0, - to AI1, and add a jumper from AI1 to GND.  Then take a differential measurement of AI0-AI1 using the +/-1V range.  This will give you a resolution of about 500uV, but a thermocouple only provides ~40uV/degC, so you can only resolve ~12degC steps this way.



#3 jstigwood

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Posted 07 November 2013 - 01:27 AM

Thanks fro the fast response.

 

That makes sense.




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