Waygate Technologies Everest Mentor Visual iQ VideoProbe Operating Manual page 62

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Measurement Plane Warnings (Edge View Angle)
When using a Measurement Plane with Point to Line, Area, or Depth to
measure near an edge, the viewing perspective can affect accuracy,
especially if the edge has a significant radius.
To help the user maximize accuracy, the system displays an Edge View
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Angle (EVA) value ( ) next to the MTD and an Edge View Angle Line (EVA
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Line) ( ) in the point cloud views. The ideal EVA of 0° occurs when the EVA
Line is perpendicular to the Measurement Plane (
Note: Measurement error generally increases as the EVA increases when
measuring near an edge. If the EVA exceeds an upper limit (25° for Point to
Line, 35° for Area and Depth measurement types) with cursors placed near
an edge, the system displays a warning message, flashes an orange outline
around the MTD and EVA, and shows the EVA Line in orange (
To reduce the EVA, inspect the Full Image point cloud, which represents
the field of view with four dotted lines (
positions of the tip and the object must be adjusted to make the EVA Line
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more perpendicular ( ) to the Measurement Plane, which appears as a
solid blue rectangle (or a blue line when viewed from the side) (
a new image with the adjusted positions, and repeat the measurement.
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).
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).
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), and visualize how the relative
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). Capture