PCB Inspection is essential in every industry, whether it is for large-scale or small-scale industries. It prevents unnecessary delays in the process of production and increases the efficiency of the process and business. To avoid such, now, PCB manufacturers & assembly services are doing various kinds of inspections on PCBs during multiple phases of production. This article discusses different PCB inspection methods and the sorts of defects they test and inspect.
The most important and popular method used in PCB inspection is visual inspection. This method involves inspecting the physical aspect of the boards. Some of the standard physical components that are inspected by many of the businessmen are their thickness, color, surface topography, flexing, adhesive backing, and the like. This way, they will get to know about their PCBs’ components and find out if they conform to the specification. They also check if there are any deformities, and they fix those as soon as possible. For this purpose, they usually apply pressure to various components of the PCBs using different methodologies.
Another widely used tool for PCB inspection is optical inspection. For this, the technician uses a specialized instrument that can quickly detect defects on the boards’ surface through the use of a spectrum analyzer. It usually uses electromagnetic radiation to determine the electrical resistance of the component of PCB. Although the method is quite popular, it does not always work well on some complicated PCBs. Thus it is not used on the production boards.
Many of the industrialists and manufacturing houses choose the low-temperature technique for the PCB inspection process. This method uses heat to melt the substance that is located on the surface of the PCBs. This melts when exposed to high temperatures. After that, the sample is removed from the machine, and then the residue is collected by using a funnel.
Aoi PCB inspection refers to the automated optical inspection method. In this method, a computer equipped with special software is utilized to collect the data through a specialized optic fiber. This fiber has an enhanced imaging capability that helps detect any defect on the surface of the PCBs. The technician needs to install the specialized instrument in the vicinity of the assembly line. This tool can be used in several production levels, starting from the desktop PC to large-scale robots.
Aoi systems help detect the flaws in the PCB, but they also help determine the quality of the final product. The process is also useful for producing high volume production processes like in the automotive and electronics industries.