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Create thresholds in AC-Graph

Add a threshold to mark a significant y value with a horizontal line. It gives you a consistent visual reference for spotting where plotted data crosses a limit.

Thresholds work in both single-file and multi-file mode.

Thresholds have no units​

A threshold is a plain numeric constant. It is not tied to miles per hour, kilometers per hour, degrees, or anything else.

Because the y axis scales to the plotted parameters, a threshold at 95 sits at 95 on that axis, and whether that means 95 km/h or 95 mph depends entirely on the parameter that set the scale. Check the parameter before you read anything into where the line falls.

Create one​

  1. Add the parameters you care about to a graph.

    A vehicle speed parameter plotted on a graph

  2. Click the blue Custom ACG Parameter icon below the parameter list.

    The Custom ACG Parameter icon

  3. Enter a name and a value. The value is the y position of the line. You can also add a description, and a start and end point expressed as a percentage of the graph width.

    Entering the threshold name and value

  4. Click Save, then Close to go back to the main AC-Graph screen.

  5. Search for your threshold in the parameter list on the Data tab. It sorts near the top.

    The new threshold in the parameter list

  6. Drag it onto the graph you want it on.

The threshold appears as a horizontal line. In this example, its configured end position stops the line at 80 percent of the graph width.

The threshold drawn across the graph