How to identify the quality of PCB circuit board?

How to identify the quality of PCB circuit board?

With the rapid development of mobile phones, electronics, communications industry, PCB circuit board industry has grown and rapid growth, but also to promote the PCB layer, weight, precision, material, color, reliability and other requirements are getting higher and higher.

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However, due to fierce market price competition, PCB board material costs are also rising in the trend, more and more manufacturers in order to enhance the core competitiveness of low prices to monopolize the market. However, these ultra-low prices behind, is to reduce the cost of materials and production costs to obtain, so that PCB prone to cracks (cracks), easy to scratch, (or scratches), its precision, performance and other comprehensive factors are not up to standard, Will seriously affect the product's solderability and reliability and so on.

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Faced with a wide variety of PCB circuit board on the market, to identify the PCB board can be good or bad from two aspects:

The first method is to distinguish from the appearance of judgment, on the other hand is from the PCB board itself to determine the quality requirements.

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▼ to determine the PCB circuit board good or bad way:

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

Under normal circumstances, the appearance of printed circuit board circuit board can be judged through three aspects:

1, the size and thickness of the standard rules

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

2, light and color

External circuit boards are covered with ink, the circuit board can play the role of insulation, if the color of the board is not bright, less ink, insulation board itself is not good.

3, the appearance of the weld

Circuit board due to more parts, if the welding is not good, parts easy to fall off the circuit board, seriously affect the quality of the circuit board welding, the appearance of good, carefully identified, the interface is very important point is very important.

Second, high-quality PCB circuit board needs to meet the following requirements:

As shown in Figure 1, requiring components installed after the phone to be easy to use, that is, electrical connections to meet the requirements;

2, the line width, line thickness, line spacing meet the requirements, so as to avoid the line heat, open circuit, and short circuit;

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

4, copper surface is not easy to oxidation, affecting the installation speed, after oxidation soon after the bad;

5, no additional electromagnetic radiation;

6, the shape is not deformed, so as not to install the shell deformation, screw hole dislocation is now mechanized installation, circuit board holes and lines and design of the deformation error should be within the allowable range.

7, and high temperature, high humidity and resistance to special circumstances should also be considered within the scope;

As shown in Figure 8, the mechanical properties of the surface to meet the installation requirements;

The above is the PCB circuit board to determine the quality of the way, in the purchase of PCB circuit board, be sure to keep your eyes.