VI User Manual - 第216页
Tools library 7 - 54 Vision 2007 4.10 User Manual Re v 01 Lead to lead Global adjustment tool tolerances ar e broad to accept all production variations. In the case above, the Global adjustment tool can not detect lifted…
Tools library
Vision 2007 4.10 User Manual Rev 01 7 - 53
5. Click on Re-test lead to lead button to test all modifications without re-execute each side.
At this stage Profiler™ are programmed in
Standard mode.
7.9.3.3 Tests
Test pin
If you click on Test pin button, the profile of the selected lead is display in green (good
lead) or red (bad lead). The reference curve (in blue) is also display.
Test all pins of the side
If you click Test all pins of this side button, all profiles of the side are display.
Only profiles validates as good by Global tolerances tool are pass to the
Lead to lead tool.
Tolerance can be applied on the gradient (on Gradient algorithm tab) in
the same way that on the
Global adjustment tool.
Global adjustment tool defaults are showed by a blue
segment and blue cross on the image.
Profiler
™
in Custom
Tools library
7 - 54 Vision 2007 4.10 User Manual Rev 01
Lead to lead
Global adjustment tool tolerances are broad to accept all production variations.
In the case above, the
Global adjustment tool can not detect lifted lead.
Lead to lead tolerances are tighter (adapted to average) to detect lead default.
Lead to Lead defaults are showed by an ellipse.
Profiler
™
in Custom
Tools library
Vision 2007 4.10 User Manual Rev 01 7 - 55
7.9.4 Expert mode
If all defects are not detected with tolerances algorithm, 3 Global adjustment tool algorithms
are proposed to detect lifted leads:
Peak threshold,
Contrast,
3D analysis.
You can use one or several algorithm. The choice depends of the position and the orientation
of the profile and of the image you obtain.
Expert mode is used when:
Size of lead of component are irregular,
Difficile case, where tolerances algorithm not detect bad leads,
...
For each
Global adjustment tool algorithm selected, the Lead to lead algorithm must be set.
7.9.4.1 Peak threshold
This algorithm can be use:
When you have a difference of lead length between bad and good lead,
When you have a difference of contrast between bad and good lead,
When you have a difference on joint aspect between bad and good lead.
Principle
This algorithm mea-
sures the
length
of
the profile between
2 points which are
determined by the
intersection be-
tween the profile
and a threshold
straight.
Limits are used
to ignore a part of
the profile.
Threshold (in grey level)
Y max
Length
Ignored
part
Ignored
part
Profiler
™
in Custom