Rockwell Automation 5370-CBPK Color CVIM BLISTER-PAK Option - Manual (Page 27)

Chapter 5
Auto Setup
5–7
The range of variations identified during the auto setup process may not,
however, accurately reflect the range of variation that you are likely to
encounter during actual production inspection operations. As the value of the
teach count parameter decreases, the tendency to under-report variation
increases. There is a way to adjust for this tendency, however. By adjusting
the variation scale parameter, you can configure the system to calculate
tolerance range values across a slightly wider range than it otherwise would.
For example, assume that the maximum observed (taught) deviations from
the mean area of any object in a given blister were +5% and –10%. If the
variation scale is set to 20%, then the area tolerances applied to that blister
would be +6% and –12%. Note that the taught variation is multiplied by the
variation scale, and the result is added to the taught variation. Table 5.A
illustrates this example and provides additional examples of variation scale.
Table 5.A
Examples of Variation Scale Settings
Observed Variation Variation Scale Calculation Resulting Tolerance
5% 20% 5% plus 20% of 5% 6%
10% 20% 10% plus 20% of 10% 12%
8% 25% 8% plus 25% of 8% 10%
15% 10% 15% plus 10% of 15% 16.5%
When you select the Variation Scale menu item, an onscreen calculator
appears, on which you can enter a variation scale value between 0% and
200%. The
Variation Scale value in the default configuration is 20%.
During the auto setup teach process, the BLISTER–PAK software creates
new blister inspection windows using the current settings of Window #1. You
can change these default values to meet your specific needs before starting
the auto setup process. Use the following steps to modify these options as
needed:
1. Click on the Adjust menu item in the Blister Setup menu bar to access
the Adjust menu.
2. Using the Advanced menu item,
a. Set window filtering, if needed. For most applications, the default
filtering of one smoothing stage should be used, and no adjustment
to this setting is required. However, if other filtering functions are
required, they must be selected at this point, before the auto setup
teach process. (Refer to the Filter (Binary Morphology) section on
page 6–13 of Chapter 6 for more information).
b. Set the blister window shape to Rectangle or Ellipse , whichever is
appropriate for the blisters in your application. (The default is
Rectangle .)
Setting Default Options