AOpen AOI-702U Spezifikationen PDF herunterladen (Seite 132)

Operations | Reference Manual

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By grabbing too much of the background in combination with a low threshold setting (~550); small dark bodied

discreet components (in combination with a dark FR4 material background); may cause false calls, as there is

not be enough difference in coloration (digital information) to catch presence/absence. Using a bare board is

VERY IMPORTANT when thresholds are set below 600 to fine-tune and eliminate false-calls or escapes.

HowtoFixBadTemplates

Inspect your templates and thresholds for all parts that are failing the bare board test. Make certain that the

existing templates are as ideal as possible. It may only take one bad template to throw off the test for a specific

part type. Delete any templates that display bad structure.

Dark 0402 on Dark FR4 Delete all bad templates Never lower than 550

Top (bad template)

Bottom (better template)

AlternateROITrainingMethod

Try increasing the region of interest (ROI) to encompass more of the part body and less of the background; or

include a small portion of the solder and a tight area of background for (0402 dark on dark) device types.

NOTE: Delete any poorly created templates.

Dark 0402 on Dark FR4 ROIs Good vs. Bad Alternate ROI Methods

Good

Not good

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AOpen AOI-702U Spezifikationen Seite 132