How to identify the quality of PCB circuit boards?

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How to identify the quality of PCB circuit boards? [Copy link]

With the rapid development of mobile phones, electronics, and communications industries, the PCB industry has also grown rapidly. People have higher and higher requirements for the number of layers, weight, precision, materials, colors, and reliability of components. However, due to fierce market price competition, the cost of PCB materials is also on the rise. More and more manufacturers are monopolizing the market with low prices in order to enhance their core competitiveness. However, behind these ultra-low prices is the reduction of material costs and process costs, but the components are usually prone to cracks (cracks), scratches, (or abrasions), and their precision, performance and other comprehensive factors are not up to standard, which seriously affects the solderability and reliability of the products used. Faced with the various PCB circuit boards on the market, there are two ways to distinguish the quality of PCB circuit boards; the first method is to judge by appearance, and the other is to judge by the quality specification requirements of the PCB board itself. ▼Methods for judging the quality of PCB circuit boards: First: distinguish the quality of the circuit board from the appearance Generally speaking, the appearance of PCB circuit boards can be analyzed and judged from three aspects; 1. Standard rules for size and thickness. The thickness of the circuit board to the standard circuit board is different in size. Customers can measure and check according to the thickness and specifications of their own products. 2. Light and color. The external circuit board is covered with ink, which can play an insulating role. If the color of the board is not bright, there is less ink, and the insulation board itself is not good. 3. Appearance of the weld. Because the circuit board has many parts, 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. It is very important to have a good appearance, careful identification, and a strong interface. Second: High-quality PCB circuit boards need to meet the following requirements 1. The telephone must be easy to use after the components are installed, that is, the electrical connection must meet the requirements; 2. The line width, line thickness, and line spacing meet the requirements to avoid line heating, circuit breaking, and short circuit; 3. The copper skin is not easy to fall off under high temperature; 4. The copper surface is not easy to oxidize, which affects the installation speed. After oxidation, it will break down soon; 5. There is no additional electromagnetic radiation; 6. The appearance is not deformed to avoid deformation of the shell after installation and misalignment of the screw holes. Nowadays, installation is all mechanized. The hole position and circuit deformation error of the circuit board should be within the allowable range; 7. High temperature, high humidity and resistance to special environments should also be taken into consideration; 8. The mechanical properties of the surface must meet the installation requirements; The above is the method to judge the quality of PCB circuit boards. When purchasing PCB circuit boards, you must keep your eyes open.