Arc Caliper Threshold, which is represented in the display by two red lines. Edges having a magnitude equal to or exceeding the Magnitude Threshold receive a score of 1. Edges with values below the Magnitude Threshold receive a score ranging from 0 to 0.999, according to a manually set magnitude con- straint function. The Magnitude Threshold value can be modified in the Advanced Parameters section of the tool interface. A Magnitude Constraint must be defined individually for each edge of an edge pair configuration. The following figure shows examples of two different setups for a magnitude constraint function. To set a Magnitude Constraint: 1.
In the drop-down list above the Function Editor, select First Edge Mag- nitude Constraint or Second Edge Magnitude Constraint. If either edge does not have the Magnitude box checked, it will not be shown in the drop-down list. 2. In the Function Editor, use the mouse to drag handles and set the mag- nitude limits. See examples in the following figure. Setting the Magnitude Constraint in the Function Editor Position Constraint Position constraints restrict the caliper’s search for edges to a specific zone of the region of interest. l It is possible to graphically set a position constraint function when the approximate position of an edge is known beforehand.
This is useful for ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 364