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How to distinguish PCB board quality is good or bad?

With the rapid development of mobile phones, electronics, and communications industries, and the continuous growth and rapid growth of PCB circuit boards, the number of components, weights, precision, materials, colors, and reliability required by people are increasing. The higher is.


However, due to the fierce market price competition, the cost of PCB circuit materials is also on the rise. More and more manufacturers have monopolized the market at a low price in order to increase their core competitiveness. However, these ultra-low prices are achieved by reducing material costs and process production costs, but devices are generally prone to cracks (cracks), scratches, (or scratches), and the combination of factors such as precision and performance are not met. , seriously affect the use of the product on the weldability and reliability and so on.


In the face of a wide variety of PCB circuit boards on the market, it can be determined from two aspects. The first method is to judge from the appearance, and the other is to judge from the PCB board's own quality specification requirements.


How to determine the PCB board is good or bad:


The first: to distinguish the circuit board from the appearance


Under normal circumstances, the appearance of PCB circuit board can be analyzed and judged by three aspects;


1, light and color.


External circuit board has ink coverage, circuit board can play the role of insulation, if the board color is not bright, less ink, insulation board itself is not good.


2, the standard rules of size and thickness.


The thickness of the circuit board to the standard circuit board is different, and customers can measure and check the thickness and specifications according to their own product.


3, the appearance of the weld.


Because there are many parts in the circuit board, if the welding is not good, the circuit board that the parts are easy to fall off will seriously affect the soldering quality of the circuit board. The appearance is good, careful identification, and a strong interface is very important.


Second: High-quality PCB circuit board needs to meet the following requirements


1, the copper surface is not easy to oxidize, affect the installation speed, soon after the use of oxidation is broken;


2. The telephone should be easy to use after the components are installed, that is, the electrical connection must meet the requirements;


3, by high temperature copper skin is not easy to fall off;


4, line width, thickness, line spacing to meet the requirements, so as to avoid line heating, circuit breakers, and short circuit;


5, no additional electromagnetic radiation;


6, and high temperature, high humidity and resistance to special environments should also be considered within the scope;


7. The shape is not deformed, so as to avoid deformation of the outer shell after installation, and the screw holes are misaligned. It is now a mechanical installation. The hole position of the circuit board and the deformation error of the circuit and design should be within the allowable range.


8, the surface of the mechanical properties to meet the installation requirements;


The above is how the PCB circuit board judges whether or not it is good or bad. When buying a PCB circuit board, it must be brightened.


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