Noise on the readings of thermocouple on the NI PCI-6225

Hi all

I have a problem with what appears to be static electricity caused by noise on thermocouples.

We test with a sand as a medium flowing through a plexiglas window and measure the temperature in the stream. The interaction of mixture air/sand flowing through the plexiglas creates a significant amount of static electricity and our thermocouple readings are severely affected. Is there a way to filter the signal so that my data and off-scale obvious signal analysis tools ignore?

The filtering I see seems to apply only to high frequency noise. I would like to cut the signals from the TCS to ignore all of the above measures 700DegF and under 32Degf.

Thank you

Hi Emi_emii,

It might be useful to see what the current state of your VI acquisition is - just to get an idea of your overall architecture. I see a couple of alternatives.

  1. You could do some external signal filtering to get rid of the extra load on your son of thermocouple - see this valuable whitepaper on the topic of wiring: http://www.ni.com/white-paper/3344/en/
  2. The extent of the filtering software, you could use the cooker and force the function (http://zone.ni.com/reference/en-XX/help/371361J-01/glang/in_range_and_coerce/) on your data and the use of the Boolean output to hide your actual data or simply to force your MAX/MIN values

Hope this helps!

Tags: NI Software

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