Specifications

Verify Device Template Quality
The AOI system relies on unique, good quality templates to detect board
defects such as missing Devices, wrong Devices, etc. False escape can be
costly and is not acceptable. Since defects on PCBs are rare, no more than a
few Devices per thousand, after training the board, it is difficult to know if all
templates are trained good (i.e., that they will not produce any false escapes).
And yet, users cannot afford to wait for a false escape to happen and then try
to fix the template. The user needs a feature to hunt for the badly trained
templates. The AOI software provides a utility feature for the user to verify the
Device templates against a suspicious scene (e.g., a pair of empty pads). It
can help the user to fine tune a board setup in order to reduce false escapes
during inspection.
The software verifies the template quality by matching the templates of the
Devices with the image of some empty pads (or any selected area). If the
Device template is good, the matching process should yield a low score (i.e.,
they don’t match). The software reports any Device template that achieves a
high score matching with an empty pad image. Users can than fix the
templates of those Devices to avoid false escapes during inspection.
To launch the utility, select Functions | Utility | Template Quality Check
from the main menu. The following dialog will display:
Define Check Window -Defines an area to perform template matching.
Reset -Goes to the beginning of the Device list.
Check -Starts matching the Device template to the check
window.
Please also see: How to Train Templates