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Process Guides

AOI and PCB Inspection: Optical, Electrical and X-ray

Inspection catches defects before they reach the customer. The right mix of optical inspection, electrical test and X-ray depends on board complexity and production volume.

Overview

This guide explains the role of aoi and pcb inspection in PCB manufacturing, the equipment involved, and how to specify it correctly. Automated optical inspection (AOI) compares the imaged board to the reference data to catch shorts, opens and width violations; electrical test (flying probe or bed-of-nails) verifies netlist continuity and isolation; X-ray inspects buried features and BGA joints.

Where It Fits in the Process

Inspection appears at multiple points: inner-layer AOI before lamination, and final AOI plus electrical test after solder mask and surface finish.

Equipment Categories Involved

Key Considerations

Flying-probe test suits high-mix/low-volume without fixtures; bed-of-nails is faster for high volume but needs a fixture per design.

Standards and Compliance

Designs and processes in this area commonly reference:

  • IPC-A-600 / IPC-A-610
  • IPC-9252 (electrical test)
  • IPC-6012

Selection and Comparison

Key trade-offs when specifying for aoi and pcb inspection:

  • AOI vs. manual inspection
  • Flying probe vs. bed-of-nails
  • 2D optical vs. X-ray for buried features

Recommended Equipment from acfindustry.com

The following machines from our catalog support the processes discussed above:

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Frequently Asked Questions

What is AOI and PCB Inspection?

Automated optical inspection (AOI) compares the imaged board to the reference data to catch shorts, opens and width violations; electrical test (flying probe or bed-of-nails) verifies netlist continuity and isolation; X-ray inspects buried features and BGA joints.

What equipment is used for aoi and pcb inspection?

It involves Inspection and Quality Control Equipment. You can browse each category and request a matched configuration through the equipment finder.

Where does aoi and pcb inspection fit in the PCB process?

Inspection appears at multiple points: inner-layer AOI before lamination, and final AOI plus electrical test after solder mask and surface finish.

What should I consider for aoi and pcb inspection?

Flying-probe test suits high-mix/low-volume without fixtures; bed-of-nails is faster for high volume but needs a fixture per design.

Which standards apply to aoi and pcb inspection?

Relevant standards include IPC-A-600 / IPC-A-610, IPC-9252 (electrical test), and IPC-6012.

How do I get a quotation for aoi and pcb inspection equipment?

Use the equipment finder on this page to specify your process stage, board type, automation level and production volume, then submit the inquiry. An engineer from acfindustry.com will respond within one business day.