03-28-2006 12:42 PM
03-28-2006 12:48 PM
03-28-2006 12:56 PM - edited 03-28-2006 12:56 PM
When I use the built in CJC source my temperature is +10F (+6c) above actual. NI sells type J, K and Uncompensated panelettes. Since I am using a type T I purchased the uncompensated panelette. I though that was how it worked. So why would I be +10F above actual?
Bryan
Message Edited by CCI_Bryan on 03-28-2006 12:57 PM
03-28-2006 02:33 PM
03-28-2006 02:44 PM
03-28-2006 03:47 PM - edited 03-28-2006 03:47 PM
Message Edité par Conseils le 03-28-2006 10:48 PM
03-28-2006 06:19 PM
I have read the manual on getting the CJ temperature reading, which I get 1.19 volts, but I get lost in the equation. I think I might just use a calibrated hand held t/c reader and adjust the CJC value and do an ambient test and a ice bath test and hope for the best. NI has a nice KnowledgeBase article about the SCB-68 and this issue, too bad they don't have one for SCC-TC02.
And yes the thermocouple is connected correctly You could be correct about the interconnecting wire material from the panelett and the TC02. I would hope that that would have been accounted for when it was designed, but who knows......
03-29-2006 01:48 AM
03-29-2006 01:50 AM
03-29-2006 10:42 AM
I am running version 8. I did find Acq CJC Temperature.vi in the example finder and if I did it properly the CJC temp is 84.34F, ambient in the room is 72F. I was looking at the SCC-TC Input Module users guide and there is a section on calibrating the module. It looks like if I can find a themocouple calibrator I can adjust the potentiometer on the top of the module. According to the manual I need to scale the voltage measurements and adjust the pot by voltage and not actual temperature units. Do you think I could get around that by reading a thermocouple with a calibrated device then adjust the pot on the module until the temperature matches? I know it would not be the perfect soloution, but it might work.