With the rapid development of mobile phone, electronics, telecommunications and other industries, continue to grow and rapid growth at the same time also prompted the PCB circuit board industry quantity, people for the components of the number, weight, color, material, precision and reliability requirements more and more high.
However, due to the fierce competition in the market price, the cost of PCB material is also on the rise, more and more manufacturers in order to enhance the core competitiveness, at a low price to monopolize the market. However, these ultra low cost is behind, reduce the material cost and production cost to obtain, but the devices are usually easy to crack (crack), easy to scratch, (or scratch), comprehensive factors of the precision, performance is not standard, the serious influence to the products for use in the solderability and reliability etc..
In the face of the market all kinds of PCB circuit board, circuit board or can distinguish PCB from two aspects; the first method is to judge from the appearance, the other is from the PCB board specifications to determine quality.
Method for judging the quality of PCB circuit board:
First: from the appearance of the circuit board to distinguish between good and bad (in general case, PCB circuit board appearance can be analyzed and judged in three ways;
1， standard rules for size and thickness.
Circuit board to standard circuit board thickness is different size, customers can measure, check according to their product thickness and specifications.
2, light and color.
The external circuit board is covered with ink, and the circuit board can play an insulating role. If the board color is not bright and the ink is less, the insulation board itself is not good.
3. Weld appearance.
Because of the more parts of the circuit board, if the welding is not good, the parts will easily fall off the circuit board, seriously affecting the welding quality of the circuit board, the appearance is good, carefully identified, the interface stronger is very important.
Second: high-quality PCB circuit boards need to meet the following requirements
1, After the components are installed, the telephone is easy to use. That is to say, the electrical connection should meet the requirements;
2, the line width, line thickness, line spacing meet the requirements, so as to avoid line heating, break, and short-circuit;
3, by the high temperature copper skin is not easy to fall off;
4, copper surface is not easy to oxidize, affect the installation speed, oxidation soon after the bad;
5, No additional electromagnetic radiation;
6, the shape is not deformed, so as not to install after the deformation of the shell, screw hole dislocation. Now all mechanical installation, the circuit board hole position and line and design deformation error should be within the allowable range;
7, and high temperature, high humidity and resistance to special environment should also be considered within the scope;
8, the surface mechanical properties should meet the installation requirements.