Owner's manual

5-36 Programming Basics and Setup
The calipers are applied perpendicular to the edges. Information obtained by “averaging” the gray values
of the pixels is calculated and the light-to-dark or dark-to-light transitions are identified. See Figure 5-22.
The highest contrast transition within the caliper search area is considered to be the part edge, so it is
important that the highest contrast edge in the caliper search area be the part edge. Adjust the Search
Length, Projection Length and light levels until the most significant transition within the caliper window
is the edge of the part.
Figure 5-22 Caliper Applied Perpendicular to Edges
5.4.3.3.2 Selecting Good Corner Fiducials
The rules for size, uniqueness, and contrast in selecting model fiducials also apply to corner fiducials.
Edges must be easily distinguishable from the background so that dark-to-light or light-to-dark transitions
are maximized. The Light Level and Gain settings can be adjusted to increase the contrast. Edges should
also be as “clean” and straight as possible, even though the software uses an averaging algorithm.
To Teach a Corner Fiducial:
1. In the Programming Window, click on
File-New on the drop-down menu or click the
Program Wizard icon on the toolbar.
2. Select
One fiducial.
3. Click on
OK.
 A Teach Window opens asking you to “Teach pattern origin.”
4. Using the position controls, move the dispensing head to the lower left-hand corner (LLHC)
of Flip Chip 1.
 Flip Chip 1 is located in the center, along the bottom edge of the tutorial board. Refer to
Figure 5-15.
5. Click on
Teach.
6. Click on
Done.
 You are now asked to select the method for teaching the fiducial.
Projection Length
Search Length
X
Application Point
Multiple Calipers