Section 3 --Operation and Adjustments 3- 10
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midway between the points where significant amounts of defects begin to show in
the accept stream.
Spot Size - For applications where small dark or light spots are not considered
defects, spot size can be used to prevent removal of excess good product. See
Section 3.2.11 for details.
Sensitivity - The sensitivity control sets the trip level, or the color difference
required to cause an eject signal. Depending on the product being sorted, you may
use dark trip, light trip or both. Remember that with a CCD detector, the sorter is
seeing very small slices of the product with each pixel. As long as the spot size
setting is small, the sorter will be as “sensitive” to small defects as it will be to large
ones. In evaluating the sorted sample when spot size is 1, any defect larger than 1
mm should be considered as a target.
With the above facts understood, the following sequence of fine-tuning adjustments
is recommended:
Verify that flow is the same for all chutes.
Correct any product flow problems to minimize bounce in the sorting area.
Check the position of the separation point on each accept tube.
Set spot size to 1 and lengthen dwell setting. Find the center of the delay
setting.
Bring dwell down to minimize good product removal, while adjusting delay
up (0.1 ms of increase in delay for each 0.2 decrease in dwell).
Adjust sensitivity to the correct defect removal level.
Adjust spot size up, if defect criteria allows, to avoid removal of excessive
good product.
Resample the product flows and evaluate the performance.
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