Panasonic PV500 User Manual page 176

Edge Detect Condition
Set conditions of detecting edges of an object.
1
Select "Edge Detect Condition".
The list of the conditions for detecting edges and the
graph is displayed.
When Detect Mode is "Measure Width", two sets of
conditions are provided. Setting these conditions enables
the 2 edges of the outer circle and inner circle to be
detected with different conditions.
2.
Set "Scan Direction".
In. -> Out.:
Scans from the center of the circle to the outside.
Out. -> In.:
Scans from the outside of the circle to the center.
In the case of Width Measurement
Edges of the outer circle and inner circle are detected with one cell.
Inside Outside
In. -> Out. Out. -> In.
In. -> Out.
Out. -> In.
Out. -> In. In. -> Out.
3.
Set "Scan Method", "Edge Condition", "Edge Threshold" and "Detect Position".
These edge detect conditions are the same as Gray Edge checker. Refer to page 110.
Scan Method: Projection / Single
Edge Condition: Light -> Dark/ Dark-> Light/ Both
Edge threshold: 50 (Default)
Detect Position: Front/Peak/Rear
The following items are available only when selecting "Single".
Filter, Width, Average Range
4.
Press the TRIG key to run a test and confirm if the edges of the circle are detected.
174
Scan Method
Scans the inner edges from the center of
the circle to the outside, and scans the
outer edges from the outside to the center.
At this time, if the outer edge is detected at
the position closer to the center than the
inner edge, the edges are undetected.
Scans the edges of the inner circle, and
starts the scan of the edges of the outer
circle from that position.
Scans the edges of the outer circle, and
starts the scan of the edges of the inner
circle from that position.
Scans the edges of the inner circle from
the center of the cell, and starts the scan of
the edges of the outer circle from that
position.
In. -> Out. Out. -> In.