## Using Blade Scan Control Points

You can use the Advanced feature for the Blade Scan command to specify control points. Control points enable you to change the scanning speed and point density for a certain part of the scan.

If you need more control points than the ones defined for normal blade measurement, you can add additional control points. You may need more control points in the following situations:

- Where a blip exists in the middle section of the blade. Because of the blip, you would like to slow the scan speed in that area, and again increase scanning speed.

- You do not want to analyze a certain area on the blade.

Note: When you define additional control points, the Blade Scan command will scan all of the blade sections in the unidirectional pattern only.

To use control points, click the Advanced button in the Blade Scan dialog box. The Blade Scan dialog box appears and displays the Control Points area:

Blade Scan dialog box with Control Points area

The Control Points area contains these items:

Item | Description
# column | FL – Fast Speed/Low Point Density control point SL – Slow Speed/Low Point Density control point SH – Slow Speed/High Point Density control point 1, 2, ... – The numbers represent additional control points.
Radius column | The size of the control point radius, which affects the area over which the control point is applied to the scan.
Density column | The point density of the scan data within the control point region.
Speed column | The scan speed within the control point region.
Add button | The Control Point dialog box, which you can use to add additional control points. For instructions, see Adding a Blade Scan Control Point. Note: To modify a control point in the Control Points area, double-click on the control point. The Control Point dialog box appears. Modify the desired value in the Control Point dialog box.
Clear button | Click this button to clear the control point that is selected in the Control Points area. Note: You cannot delete the FL, SL, and SH control points.
Clear All button | Click this button to clear all additional control points that were added.
Basic button | Click this button to display the Fast Speed Zone and Slow Speed Zone areas for setting up control points. For more information, see Creating a Blade Scan Command.