Erroneous or Noisy Thermocouple Readings Causing Hardware Trigger to FailHardware: SCXI
Problem: My thermocouple is returning noisy and erroneous readings when trying to trigger at a specified level using a hardware trigger within NI-DAQ and an SCXI-1102 module in an SCXI chassis. I am applying heat to the thermocouple by pinching it between my fingers. What can I do to eliminate this noise? Solution: In order to create a cleaner, less noisy, and steadier positive slope to trigger a task, it is better not to touch or move the thermocouple around. Try using other heating or cooling sources, such as breathing on the thermocouple, using an alternate heat source, or putting it in ice water for negative slopes. Make sure that the thermocouple doesn't brush the sides of the liquid container. Related Links: KnowledgeBase 2FBGSAQO: How to Determine the Thermocouple Type and the Correct Polarity of Signal Connections Attachments:
Report Date: 03/28/2005 Last Updated: 01/16/2009 Document ID: 3JR9BGY3 |
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