Hi, I am new here and do not know much about Labview. T-type thermocouples are connected to SCXI-1000 chasis with 1102 module and 1303. I use 20 channels and 12 are left open. For those open channels, reading from Labview program is around 139oC. However, the measured temperature from those occupied channels cannot exeed this temperature, no matter how hot I heated the test surface. Is this due to the Labview program or the resistor of inside the 1303 or any other possible reason? Thanks alot.

Hi Johnrally, By "139oC" do you mean 139 °C, 1390 °C, or something else? 1390 °C is well outside the temperature range of T-type thermocouples according to NIST. However, it's close to the upper limit for K-type thermocouples. Are you sure your program is specifying the correct thermocouple type? If that doesn't answer your question, please post a snippet of code to show what your program does. Also, I recommend double-checking the SCXI configuration in MAX, to make sure the SCXI-1303 is configured correctly (and is not configured as an SCXI-1300). Brad

Signal Conditioning

thermocouple reading limited to a value

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Have you tried to check the range specified in MAX? If you accidentally set the range for all thermocouples to 139 degrees C, then you would max out at that number no matter whether it was an open TC or a TC heated to beyond that temperature.

-Matt

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Signal Conditioning

thermocouple reading limited to a value

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