- Dec 14, 2017 -
How can we know the good or bad of the PCB circuit board
With the rapid development of mobile phones, electronics and communication industry, PCB circuit board industry is also expanding and growing rapidly. People are more and more demanding on the number, weight, precision, material, color and reliability of components.
However, due to the fierce competition in the market, the cost of PCB board materials is also increasing. More and more manufacturers are trying to enhance their competitiveness and monopolize the market at low prices.
However, these ultra low price products, is to reduce the material cost and production cost to obtain, but the devices are usually easy to crack (crack), easy to scratch, (or scratch), precision, performance and other factors is not standard, the serious influence to the products for use in the solderability and reliability and so on.
To face all kinds of PCB circuit boards on the market, there are two ways to identify the PCB circuit boards. The first method is to distinguish the appearance of the PCB from the appearance, and the other is to judge from the quality specification requirements of the PCB board itself.
Methods of judging the quality of PCB circuit board:
First: distinguish the quality of the circuit board from the appearance.
1, standard rules for size and thickness.
The thickness of the circuit board to the standard circuit board is different, and the customer can measure and check the thickness and specifications of the product according to its own product.
2, luster and color.
External circuit boards are covered with ink, circuit boards can play the role of insulation, if the color of the board is not bright, less ink, insulation board itself is not good.
3, the appearance of the welding
Because PCB board has many parts, if the welding is not good, the component is easy to fall off will seriously affect the welding quality of the PCB board. It is very important to have a good appearance, careful identification and strong interface.
Secondly: high quality PCB board needs to meet the following requirements.
1, if the component is installed on the phone, the telephone is better used, that is, the electrical connection should meet the requirements.
2,the circuit width, circuit thickness, circuit distance meet the requirements, so as to avoid circuit heating, circuit breakage, and short circuit.
3, the copper is not easy to fall off under high temperature
4, the copper surface is not easy to oxidize, affects the installation speed, after the oxidation it will be bad very soon.
5. No additional electromagnetic radiation.
6. The shape is not deformed, so as to avoid the deformation of the housing and screw hole misalignment after installation. Now all are mechanized installation, and the deformation error of the PCB's hole position and line and design should be within the allowable range.
7. And high temperature, high humidity and resistance to special environment should also be considered within the scope.
8. The mechanical properties of the surface should meet the requirements of installation.