How to judge the quality of PCB circuit board?

How to judge the quality of PCB circuit board:

First, distinguish the quality of the circuit board from the appearance

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

1. Standard rules for size and thickness

    The thickness of the circuit board is different from that of the standard circuit board. Customers can measure and check the thickness and specifications of their own products.

2. Light and color

    The external circuit boards are covered with ink, and the circuit board can play an insulating role. If the color of the board is not bright and the ink is less, the insulation board itself is not good.

3. Appearance of weld

    The circuit board has many parts. If the soldering is not good, the parts are easy to fall off the circuit board, which will seriously affect the soldering quality of the circuit board. The appearance is good. It is very important to identify carefully and have a strong interface.

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

　　 1. The telephone is required to be easy to use after the components are installed, that is, the electrical connection must meet the requirements;

　　2. The line width, line thickness, and line distance of the line meet the requirements to prevent the line from heating, breaking, and short-circuiting;

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

　　4. The copper surface is not easy to oxidize, which affects the installation speed, and it will be broken shortly after oxidation;

　　 5. No additional electromagnetic radiation;

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

　　7. High temperature, high humidity and resistance to special environments should also be considered;

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

　　 The above is the way to judge the quality of PCB circuit boards. When purchasing PCB circuit boards, you must keep your eyes open.