How to measure thermocouple in lab view and save the data..

hi.. i am using my DAQ with 2 analog channels.. i need to acquire signal from thermo couple i have T type thermo couple with brown jacket.. i have connected the thermocoupe in ai0.. and i selected the thermocouple type... when i select the built in option.. it shows some error.. then if i use cjc value as constant 25 its working.. but the signal acquired is not matching well.. it show huge variation.. some times it goes for -20 and maximum of 60 which is not possible at all...just in air medium i checked it... when i used infrared thermometer it shows around 24 C... kindly help me.. i have attached the screen shot of the block diagram panel... and acquired signal..
Attachments:
Doc1.docx ‏425 KB

Hi,
You hooked up to the analog inputs on your device correctly. Thermocouples measure the difference in temperature between the DAQ and the location where the wires are welded together. They need to be insulated thermally and electrically in-between. Thermocouples have very low response compared to the normal 10 volt DAQ range. Type T is only 43 uV/C (thats 0.000043V compared to 10 volts). To see if the thermocouple is working, you need to heat up the welded end. They measure 0 V when the welded end is at room temperature. Type T only goes up to a few hundred C, so be careful, but you can probably wave a lighter under it to see if it's working. You might try the audio in on your device. You don't need a high sampling rate and it may have a better amplifier and dynamic range.
To get absolute temperature you need to offset the thermocouple reading from the DAQ temperature (room temp usually). You could do this by measuring it with your IR thermometer. Check into the NI 9211 and simliar which are much better suited to thermocouple measurements.
Good luck!

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> Is there a way to do simultaneous AI and AO and keep the data in the
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