For Bare printed circuit boards, The AOI test verifies the finished conductor trace image for deviations from the Gerber data and finds errors that the E-Test may not discover, such as (for example) narrowed, but still unbroken conductor traces.
The AOI test is especially important for the following application areas:
1. High frequency
2. High power loads
3. High data transmission rates
4. Op-amps with high amplification factors and input resistances
The inner layers of multilayer PCB use AOI to scan before they are pressed together. This guarantees the high reliability of multilayer boards.
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