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After completing this topic, you can narrow down the root cause of an anomaly by isolating the affected time range and comparing related signals.

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Before you begin

  • You have a Run with an identified anomaly open in Explore with the affected Channel plotted.

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How anomaly investigation works

When a signal shows unexpected behavior, you can zoom into the affected time range and plot related Channels side by side to determine whether the anomaly is isolated to a single signal or correlated across multiple signals. Comparing related Channels helps narrow down the root cause, such as a sensor failure, an environmental event, or a system-level issue.

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Investigate an anomaly

  1. In the toolbar, select a range control to zoom into the time range where the anomaly occurs.
    • Range controls are available in Timeseries, FFT, and Scatter Plot Panels.
  2. Add related Channels to the same Panel or split the Panel by right-clicking its tab and selecting a split direction to compare signals in an adjacent Panel.
  3. Optional: Create a Calculated Channel to derive a signal that highlights the anomaly, such as a difference or ratio between two Channels:
    1. Click the Calculated Channels tab.
    2. Click Create new Calculated Channel.
    3. Select the Asset to attribute the Calculated Channel.
    4. In the Calculated Channel name box, enter a name.
    5. Click the Input Channels list.
    6. In the Expression box, enter the CEL expression.
    7. Optional: In the Unit box, enter a unit.
    8. Optional: Turn on the Save to Asset toggle to save the Calculated Channel for future reuse.
    9. Click Add Calculated Channel.
  4. Optional: Add an Annotation to mark the anomaly for review or to share with your team:
    • In the Annotations tab, click Create new Annotation, select a type (Phase or Data Review), configure the fields, and click Add Annotation.
    • Alternatively, click Select X, drag over the time range in the Timeseries Panel, right-click the selection, and select Create Annotation.
  5. Optional: In Explore, click Share to send the exact state of your investigation to another engineer.
  6. Optional: Create a Rule to automatically detect the same anomaly in future Runs.

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Reference