What is the quality of PCB?

After the PCB circuit board is completed, the quality inspection of the circuit board is indispensable. Firstly, the appearance of the circuit board is distinguished from the appearance. Under normal circumstances, the appearance of the PCB circuit board can be analyzed and judged in three aspects:


1. Standard rules for size and thickness.


The thickness of the PCB board to the standard board is different, and the customer can measure and check the thickness and specifications according to their own products.


2. The appearance of the weld.


Due to the large number of PCB circuit board parts, 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, and the appearance is good. It is very important to carefully identify the interface.


3. Light and color.


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

In general, high quality PCB boards should meet the following requirements:


1, It is not easy to fall off due to high temperature copper skin;


2, the copper surface is not easy to oxidize, affecting the installation speed, and soon after the oxidation is broken;


3, No additional electromagnetic radiation;


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


5, The quality of high temperature, high humidity and special environment should also be considered;


6, The shape is not deformed, so as to avoid deformation of the outer casing after installation and the screw holes are misaligned. Now it is mechanized installation, the hole position of the circuit board and the deformation error of the line and design should be within the allowable range.