TC CJC Accuracy
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From: ASTDan on 7 May 2008 10:10 Hello, I noticed that the USB Thermocouple module has 1 degree F of accuracy for the CJC. Is there a way to improve this i.e. external CJC Thermocouple using an ice bath? <a href="http://www.ni.com/pdf/manuals/371566e.pdf" target="_blank">http://www.ni.com/pdf/manuals/371566e.pdf</a> What products/techniques can be used to improve this accuracy. Thanks Dan
From: hrh1818 on 7 May 2008 12:41 On May 7, 9:10 am, ASTDan <x...(a)no.email> wrote: > Hello, > > I noticed that the USB Thermocouple module has 1 degree F of accuracy for the CJC. Is there a way to improve this i.e. external CJC Thermocouple using an ice bath? > > <a href="http://www.ni.com/pdf/manuals/371566e.pdf" target="_blank">http://www.ni.com/pdf/manuals/371566e.pdf</a> > > What products/techniques can be used to improve this accuracy. > > Thanks > > Dan The document you provided a link to shows that the 9211/9211A has a raw analog input mode. Hence you could use a combination of an ice bath for your cold junction reference and the raw analog input mode to measure the output of your thermocouple. Howard
From: Joseph Loo on 7 May 2008 14:40 I do not see how you got the 1 deg F accuracy. I looked at the curve andsee a 1 deg C minimum at certain locations. You did not state what tempeature range you are looking, In addition, you did not specified what type of thermocouple you have, if it is a special calibrated thermocouple. In general, thermocouples are +/- 5 deg F depending on your thermocouple. If you need that kind of accuracy, I suggest looking at thermistors or rtd.
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