Bare PCB Inspection
AOI for a bare PCB board inspection may detect these features:
- Line width violations.
- Spacing violation.
- Access copper.
- Missing pad. I.e. a feature that should be on the board is missing.
- Shorts circuits.
- Cuts.
- Hole breakage. I.e. a drilled hole (via) is outside of its landing pad.
The triggering of a defects report may be either rule based (e.g. no lines on the board should be smaller than 50μ) or CAD based in which the board is locally compared with the intended design.
This inspection is much more reliable and repeatable than manual visual inspection.
Read more about this topic: Automated Optical Inspection
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