Methods for judging the quality of PCB board

After the PCB design is completed, it needs to be output to the PCB board factory for processing, production, mounting and assembly.

Faced with the fierce competition in the PCB market, the cost of PCB board materials is also on the rise. More and more manufacturers are monopolizing the market at low prices in order to enhance their core competitiveness. However, behind these ultra-low prices, the material cost and craft fabrication cost are reduced, but the device is usually prone to cracks (cracks), scratches, (or scratches), and the comprehensive factors such as precision and performance are not up to standard. , seriously affecting the solderability and reliability of the products usage.

Faced with a variety of PCB circuit boards on the market, the quality of PCB boards can be distinguished from two aspects; the first method is to judge from the appearance, and the other is to judge from the quality specifications of the PCB board itself.

The method to judge the quality of the PCB board:

First: distinguish the circuit board from the appearance of the board. Under normal circumstances, the appearance of the PCB circuit board can be analyzed and judged through three aspects;

1.light and color. The external circuit board has ink coverage, and the circuit board can play the function of insulation. If the color of the PCB board is not bright, there is less ink, and the insulation board itself is not good.

2. Standard rules for size and thickness. The thickness of board is different, and the customer can measure and check the thickness and specifications according to their own products.

3. The appearance of the welding. Due to the large number of parts on the circuit board, if the welding is not good, the circuit board that the parts are easy to fall off seriously affects the welding quality of the circuit board. Good appearance, careful identification, and a strong interface is very important.

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

1. The copper surface is not easily oxidized, affecting the installation speed, and it will be broken soon after oxidation;

2, after the components are installed, the telephone should be easy to use, that is, the electrical connection should meet the requirements;

3. It is not easy to fall off if copper skin affected by high temperature ;

4. the wire width, wire thickness, wire spacing meet the requirements, in order to avoid wire heating, open circuit, and short circuit;

5. There is no additional electromagnetic radiation;

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

7. the shape is not deformed, so as to avoid deformation of the shell after installation, screw holes are misaligned. Now it is mechanized installation, the hole position of the circuit board and the deformation error of the wire and design should be within the allowable range;

8. The mechanical properties of the surface must meet the installation requirements;

The above is the method of judging whether the PCB board is good or bad. Be cautious when purchasing PCB boards.