How to identify the advantages and disadvantages of PCB circuit boards, many small partners may not be able to make a direct judgment. Today, the small editor of PCB manufacturers will show you how to make an intuitive judgment.
The market price of PCB circuit board has been fiercely competitive. Affected by this factor, the cost of PCB material has also shown a rising trend. In order to improve their core competitiveness, more and more manufacturers try to monopolize the market with low prices. However, the reason behind these ultra-low prices is to reduce the material cost and process manufacturing cost. However, devices are usually prone to cracks (cracks), scratches, (or scratches), and their precision, performance and other comprehensive factors are not up to standard, which seriously affects the solderability and reliability of products.
In the face of various PCB circuit boards in the market, we can start from two aspects when we tell whether the PCB circuit board is good or bad. The first method is to judge from the appearance.
Some friends may wonder, how can we judge from the appearance? We should start from three aspects; First, the standard of size and thickness. The thickness of the circuit board is different from that of the standard circuit board. Customers can measure and check the thickness and specifications of their products. The second is the light and color of the board. The external circuit board is covered with ink. The circuit board can play an insulating role. If the color of the board is not bright and less ink is used, the insulation board itself is not good. The third is the weld appearance. The circuit board has many parts. If the welding is not good, the parts are easy to fall off, which seriously affects the welding quality of the circuit board. The appearance is good. It is very important to carefully identify the strong interface.
Of course, the above is only a basic judgment. On the other hand, we judge from the quality specification requirements of the PCB itself:
1. It is required that the telephone should be easy to use after the components are installed, that is, the electrical connection should meet the requirements;
2. The line width, line thickness and line spacing of the line shall meet the requirements to avoid heating, open circuit and short circuit of the line;
3. Copper skin is not easy to fall off under high temperature;
4. The copper surface is not easy to be oxidized, which affects the installation speed, and it will be damaged soon after oxidation;
5. No additional electromagnetic radiation;
6. The appearance is not deformed to avoid deformation of the shell and dislocation of screw holes after installation. At present, the installation is mechanized, and the hole position of the circuit board and the deformation error between the circuit and the design should be within the allowable range;
7. High temperature, high humidity and special environment resistance should also be considered;
8. The mechanical properties of the surface shall meet the installation requirements;