Cognex Checker 3G Series, User Manual

Page: 13 / 25

24 25
1
2
Adjusting Edge Sensitivity
The sensitivity control for measurement sensors controls how many edges the sensor
evaluates when measuring your feature As you move the sensitivity slider, the sensor displays
the edges that it finds as yellow lines.
1 Sensitivity Slider : slide right to detect more edges, slide left to detect fewer edges
2 Edge Display : Found edges shown in yellow, as long as slider is clicked
If you are unable to get a measurement sensor to lock onto the edge you want to
X
measure, try increasing the sensitivity. If the sensor locks onto the wrong edge, try
reducing the sensitivity.
Advanced Measurement Sensor Features
Selecting the Edge Search Rule
Normally, width and height sensors measure the edges that are closest to the caliper blades while
diameter sensors measure the strongest edges
You can select a different rule for edge selection using the
Search For rule
Closest The sensor uses the edges that are closest in spacing and
position to the edges that it found when you created the sensor (or
when you adjusted the sensor position)
Narrowest/Smallest The sensor uses the edges that are the closest together (Width
and Height sensor) or smallest in diameter (Diameter sensor)
Widest/Largest
The sensor uses the edges that are furthest apart (Width and
Height sensor) or largest in diameter (Diameter sensor)
Strongest The sensor uses the edges with the strongest contrast (the
greatest difference in brightness between the two sides of the
edge)
If a measurement sensor locks onto the wrong edges for some parts, you can select a different
Search For rule to force the sensor to measure the correct edges
You can set a different Search For rule for each sensor in your job