Automated Optical Inspection Testing (AOI Testing ) of MOKO

With becoming more complicated, miniature and integrating, leading to higher density and complexities of Printed Circuit Boards (PCBs). Therefore, high efficiency and correctness of finding defects in PCB assembly process allows instant exposure of defects and ensures the high quality of the remaining PCB assemblies. In addition, conventional visual inspection fails to meet requirements of high density and complexities. In this way, MOKO depends on Automated Optical Inspection (AOI).

As a primary testing technique in PCB assembly, AOI applies to fast and accurate inspection of errors or defects occurring in PCB assembly process so that high quality of PCB assemblies can be ensured with no defect after their leaving assembly line. AOI can be applied both to bare PCBs and PCB assembly. Here at MOKO, we mainly apply AOI to inspect SMT (Surface Mount Technology) assembly line and for testing of bare circuit boards, flying probe is used instead.

Automatic Optical Measuring Instrument VCTAB486
Automatic Optical Measuring Instrument VCTAB486

At MOKO, AOI equipment is applied with its model VCTAB486 whose image and attributes are displayed below.

Automatic Optical Measuring Instrument VCTAB486

Positioning accuracy<0.15mm

Moving Speed:700mm/s

Measurable minimum element:0201

Measurable Pcb range:25*25mm-340*480mm


Automated Optical Inspection (AOI) | MOKO Technology Ltd

Depending on a high-definition camera, this equipment can capture images of PCB surface with the help of numerous light sources. Then, comparison will be made between the captured image and board parameters that have been input into computer in advance so that differences, abnormalities or even errors can be clearly indicated by its built-in processing software. The whole process can be monitored at any second.

AOI is contributive to efficiency improvement because it is placed on SMT assembly line, just after reflow. As soon as some problems are inspected and reported by AOI equipment, engineers can instantly change corresponding parameters in the previous stages of the assembly line so that remaining products will be correctly assembled.

Defects AOI can cover primarily come in soldering and components categories. In terms of soldering, defects can range from open circuits, solder bridges, solder shorts, insufficient solder to excess solder. Component defects include lifted lead, missing component, misaligned or misplaced components.

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