With the rapid development of the electronics and communication industries, but also to promote the PCB industry continues to grow and grow rapidly, people for electronic components of the circuit board layer, weight, precision, materials, color, reliability and other requirements are getting higher and higher.
However, due to the fierce market price competition, the cost of PCB board materials is also in a rising trend, more and more manufacturers in order to enhance the core competitiveness, to monopolize the market at low prices. However, behind these ultra-low prices, it is to reduce the cost of materials and process production costs to obtain, but the components are usually prone to cracks (cracks), easy scratches, (or bruises), and the comprehensive factors such as precision and performance are not up to standard, which seriously affects the weldability and reliability of the products used.
In the face of a wide variety of PCB circuit boards on the market, the identification of PCB circuit boards can be started from two aspects; The first method is to judge from the appearance, and on the other hand, to judge from the quality specification requirements of the PCB board itself.
1. distinguish the quality of the circuit board from the appearance, under normal circumstances, the appearance of the PCB circuit board can be analyzed and judged through three aspects;
1.1. Standard rules for size and thickness.
The thickness of the circuit board to the standard circuit board is different sizes, customers can measure and check according to their own product thickness and specifications.
1.2. Light and color.
The external circuit board is covered with ink, the circuit board can play the role of insulation, if the color of the board is not bright, less ink, the insulation board itself is not good.
1.3. Appearance of weld.
Because there are more parts of the circuit board, if the welding is not good, the parts are easy to fall off the circuit board, which seriously affects the welding quality of the circuit board, the appearance is good, carefully identify, and the interface is very important.
2. high-quality PCB circuit boards need to meet the following requirements
2.1. The telephone should be easy to use after the components are installed, that is, the electrical connection should meet the requirements;
2.2. by high temperature copper skin is not easy to fall off;
2.3. no additional electromagnetic radiation;
2.4. the mechanical properties of the surface should meet the installation requirements;
2.5. and high temperature, high humidity and special environment should also be considered in the range;
2.6. the copper surface is not easy to oxidize, affecting the installation speed, and it will be broken soon after oxidation;
2.7. the line width, line thickness, line distance meet the requirements, so as to avoid heat, break, and short circuit of the line;
2.8. the shape is not deformed, so as to avoid deformation of the shell after installation and dislocation of the screw hole. Now are mechanized installation, the hole position of the circuit board and the deformation error of the line and design should be within the allowable range.
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