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Data Acquisition: Troubleshooting Bad Readings

Hardware: Multifunction DAQ (MIO)

Problem:
Do you have any troubleshooting tips for data acquisition (DAQ) systems that are generating bad readings?

Solution:
Which of the following cases best describes your situation?
  • Offset readings - Consistent offset in your readings (KnowledgeBase 28N9I7QO)

  • Random readings - Readings that are neither offset nor appear as your signal should (KnowledgeBase 28MH22QO)

  • Noisy readings - The readings are close to what they should be, but unacceptably noisy (KnowledgeBase 28MFG3QO)

  • Unexpected voltages or crosstalk - Ghost voltages, signals on unconnected channels, counters counting unconnected sources (KnowledgeBase 28MF7JQO)
To find out more about sources of noise and how to avoid them, please see Developer Zone Tutorial: Field Wiring and Noise Considerations for Analog Signals.

Also, check the National Instruments Accuracy Calculator to confirm that your data acquisition hardware is up to the task that you have set for it.

Related Links:
KnowledgeBase 28N9I7QO: Data Acquisition: Troubleshooting Offset, Incorrect, and Noisy Readings
KnowledgeBase 28MH22QO: Data Acquisition: Troubleshooting Incorrect Readings
KnowledgeBase 28MFG3QO: Data Acquisition: How Should I Troubleshoot Noisy Readings?
KnowledgeBase 28MF7JQO: Troubleshooting Unexpected Voltages, Floating, or Crosstalk on
Analog Input Channels
Data Acquisition Support
Accuracy Calculator
Developer Zone Tutorial: Field Wiring and Noise Considerations for Analog Signals

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Report Date: 04/24/2001
Last Updated: 08/31/2007
Document ID: 28N9A7QO

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