How to Distinguish Good and Bad PCB Circuit Boards?

With the rapid development of mobile phones, electronics, and communications industries, the PCB industry has also grown rapidly, and people have higher and higher requirements for the number of layers, weight, precision, materials, colors, and reliability of components.However, due to fierce market price competition, the cost of PCB materials is also on the rise. More and more PCB manufacturers are monopolizing the market with low prices in order to enhance their core competitiveness. However, behind these ultra-low prices is the reduction of material costs and process costs, but the devices are usually prone to cracks (cracks), scratches, (or abrasions), and their precision, performance and other comprehensive factors are not up to standard, which seriously affects the solderability and reliability of the products used. Faced with a variety of PCB circuit boards on the market, there are two ways to distinguish the quality of PCB circuit boards: the first method is to judge by appearance; the other is to judge by the quality specification requirements of the PCB board itself.

1. Distinguish the quality of the circuit board from the appearance
Generally speaking, the appearance of the PCB circuit board can be analyzed and judged from three aspects:
Standard rules for size and thickness
The thickness of the circuit board to the standard circuit board is different in size. Customers can measure and check the thickness and specifications of their own products.
Light and color
The external pcb circuit board is covered with ink, and the circuit board can play an insulating role. If the color of the board is not bright, there is less ink, and the insulation board itself is not good.
Weld appearance
Since the pcb circuit board has many parts, if the welding is not good, the parts are easy to fall off the circuit board, which seriously affects the welding quality of the circuit board. Good appearance, careful identification, and strong interface are very important.

2. High-quality PCB circuit boards need to meet the following requirements
The telephone should be easy to use after the components are installed, that is, the electrical connection should meet the requirements;
The line width, line thickness, and line spacing of the line meet the requirements to avoid heating, disconnection, and short circuit of the line;
The copper skin is not easy to fall off under high temperature;
The copper surface is not easy to oxidize, which affects the installation speed. It will break down soon after oxidation;
There is no additional electromagnetic radiation;
The appearance is not deformed to avoid deformation of the shell after installation and misalignment of the screw holes. Nowadays, installation is all mechanized, and the hole position and circuit deformation error of the circuit board should be within the allowable range; high temperature, high humidity and resistance to special environments should also be considered; the mechanical properties of the surface must meet the installation requirements.