Thermocouple not reading correctly using SCC-TC01

We have set-up several thermocouple inputs that are conditioned by SCC-TC01. These are professional grade thermocouples of type J and K. It appears that the the readings from the thermocouples is incorrect (-1.15 mV at room temperature). This means the temperature it is reading is negative. We tried switching the positive and the negative, but the reading is still negative. The gain through SCC-TC01 appears to be 100 so we tried to correct the measurement that way, but it does not seem to work (we tried multiplying and dividing by different powers of 10). We thought that maybe the thermocouples were faulty, but using new did not correct the problem. We have been successful in using the same data acquisition board in measuring other signals such as for load cells, so this problem with the thermocouples is puzzling. When we increase the temperature around the thermocouple it also does not appear to respond as significantly as it should.
Thanks,
Rob Jackson

Hi Rob,
You mentioned that the offset voltage you had to provide in your program changed each time you started the VI, and indicated that this was possibly due to changes in ambient temperature. This would be compensated by the CJC sensor, which is built into your SCC-TC01. Since MAX does not allow you to select the built in CJC Sensor, the SCC may be configured incorrectly, possibly due to the SCC-TC01 being assigned to the incorrect port or some other mistake. You did not mention in your previous post the results of going through the quick start guide and ensuring the configuration is correct. This would be a helpful trouble shooting step. Since the device is for signal conditioning, if the configuration is off, the resulting data will be off.
You had also mentioned that you are using the “new” LabVIEW routines. If you are referring to programming with DAQmx instead of Traditional DAQ, this will not be a concern. In MAX, where the test panels are being run, it does not matter if you were using DAQmx or DAQ, since the test panel is looking at the actual hardware.
I hope that this helps. Please let me know if you have any further questions I can clarify or if this solution does not take care of your missing VI issue. Thanks-
Mallori M
Mallori M
National Instruments
Global Customer Education Program Mananger
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