How to identify PCB circuit board if it is good or bad ?

       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, the customer for the PCB plant components number, weight, color, material, precision and reliability requirements more and more high.

       However, due to the fierce market price competition, PCB board material costs are also in a rising trend, more and more manufacturers in order to enhance the core competitiveness, to a low price to the monopoly 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 good or bad

Under normal circumstances, the appearance of the PCB circuit board can be analyzed and judged by three aspects;

1, size and thickness of the standard rules.

The thickness of the circuit board to the standard circuit board is different in size, the customer can measure the inspection according to the thickness of their products and specifications.

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 plate is not bright, less ink, insulation board itself is not good.

3, weld appearance.

Circuit board due to more parts, if the welding is not good, the parts are easy to fall off the circuit board, seriously affect the circuit board welding quality, good appearance, careful identification, interface is very important.

Second: high quality PCB circuit boards need to meet the following requirements

1, the requirements of components installed after the phone is better to use, that is, the electrical connection to meet the requirements;

2, line width, line thickness, line distance to meet the requirements, so as to avoid the line heating, circuit, and short circuit;

3, the high temperature of copper is not easy to fall off;

4, copper surface is not easy to oxidation, the impact of the installation speed, after oxidation with the bad;

5, there is no additional electromagnetic radiation;

6, the shape is not deformed, so as to avoid the deformation of the shell after installation, screw hole dislocation. Now it is the mechanical installation, the hole position of the circuit board and the line and the design of the deformation error should be within the allowable range;

7. High temperature, high humidity and special environment should also be considered;

8, the mechanical properties of the surface to meet the installation requirements;

        Above is a summary of the PCB PCB line board to judge the quality of the method, in the purchase of PCB circuit board, be sure to keep their eyes open.


 

(Source: Inside information)

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