Chapter 3. Using Your ATS
3.10
While the
Continuous find
box is checked, the
Find Once
button is disabled. To cancel
continuous find, uncheck the box.
Setting the Target Criteria
When you have successfully centered the target within the sight ring, the X and Y coordinates
will both ideally be zero. In practice, you might not need to have them exactly zero, just close
enough. You can specify your desired tolerances for the target measurement. As long as you
position the target within the sight ring, you know that it is centered within your specified
tolerances.
In addition to specifying tolerances for the X and Y measurements, you can specify a target
value and tolerance for the Z coordinate. The specified range for Z is 6.4 mm – 45 mm (0.25" –
1.8"). The target configuration file that TeachView uses to recognize a given target is created
from an image of the target that was captured at a specific Z value (for more information, see
“Creating Target Configuration Files,” on page 4.1
). When you use a particular target
configuration file, the teaching wafer will be able to recognize the target more successfully if the
wafer is at the same Z value that was used to create the target configuration file. Specifying a
target Z value and tolerance makes it easy to tell when the teaching wafer is at the proper
height.
You can set separate tolerance values for the X and Y measurements, or you can specify a single
tolerance value for both measurements.
To specify the target criteria:
1. Choose the menu item
Settings > Set Target Criteria
.
