How to judge the PCB circuit board is good or bad

Firstly, the appearance of the circuit board can be distinguished from the appearance (in general, 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 to the standard circuit board is different, and customers can measure and check the thickness and specifications according to their own product.

 2, light and color.

External circuit board has ink coverage, circuit board can play the role of insulation, if the board color is not bright, less ink, insulation board itself is not good.

3, the appearance of the weld.

Because there are many parts in the circuit board, if the welding is not good, the circuit board that the parts are easy to fall off will seriously affect the soldering quality of the circuit board. The appearance is good, careful identification, and a strong interface is very important.

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

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

2. The line width, line thickness and line spacing of the line shall meet the requirements so as to avoid the line heating, circuit breaking, and short circuit;

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

4, copper surface is not easy to oxidize, affect the installation speed, soon after the use of oxidation is broken;

5, no additional electromagnetic radiation;

6, the shape is not deformed, so as not to install the rear shell deformation, screw holes dislocation. It is now a mechanical installation. The hole position of the circuit board and the deformation error of the circuit and design should be within the allowable range.

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

8, the surface of the mechanical properties to meet the installation requirements