With the rapid development of mobile phone,electronics,telecommunications and other industries continue to grow and also prompted the PCB circuit board industry quantity at the same time ,people requirements are more and more high in components of number,weight,color,material,precison and reliability.

However,due to the fierce competition in the market price,the cost of PCB circuit board material is also in the rising trend,more and more manufacturers at a low price to monopolize the market in order to enhance the core competitiveness.However ,these ultra low cost behind is reduction of material cost and production cost, lead to the devices are usually easy to crack,scratch, comprehensive factors included the precision,performance were not certificated,the serious influence the solderability and liability of products use.

In the face of the market all kinds of PCB circuit board, a good circuit board can distinguish from two aspects; the first method is to judge from the appearance, the other is from the PCB board specification quality.

Method for judging the quality of PCB circuit board:

First: from the appearance of the circuit board to distinguish between good and bad.

Generally, the appearance of the PCB circuit board can be analyzed and judged in three aspects;

1.Standard rules for size and thickness

Circuit board to standard circuit board thickness is different size, customers can measure and 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.  Copper surface is not easy to oxidize, affect the installation speed, oxidation soon after the bad;
    2. After the components are installed, the telephone is easy to use. That is to say, the electrical connection should meet the requirements;
    3. By the high temperature copper skin is not easy to fall off;
    4. The line width, line thickness, line spacing meet the requirements, so as to avoid line heating, break, and short-circuit;
    5. No additional electromagnetic radiation;
    6. And high temperature, high humidity and resistance to special environment should also be considered within the scope;
    7. 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;
    8. The surface mechanical properties should meet the installation requirements;

The above is the PCB circuit board to judge the good and bad methods, in the purchase of PCB circuit board, be sure to polish your eyes.