Due to the fierce market price competition, the cost of PCB circuit board materials is also on the rise. More and more PCB manufacturers are monopolizing the market at low prices in order to enhance their core competitiveness. However, behind these ultra-low prices, it is obtained by reducing material costs and process manufacturing costs, but devices are usually prone to cracks (cracks), scratches (or scratches), and the comprehensive factors such as precision and performance are not up to standard. Seriously It affects the solderability and reliability of the product used. Faced with all kinds of PCB circuit boards on the market, how should we distinguish the quality of PCB circuit boards?

The first method is visual inspection, which is mainly to check the appearance of the circuit board. The most basic thing to check the appearance is to first check whether the thickness, size and other information of the board meet the thickness and specifications you need. If not, you need to make a new one. In addition, with the fierce competition in the PCB market, various costs continue to rise. In order to reduce costs, some manufacturers continue to reduce material costs and production costs. Ordinary HB, cem-1, cem-3 sheets have poor performance and are easily deformed, and can only be used for single-panel production, while fr-4 fiberglass sheets are much better in strength and performance, and are often used in double-panel and multi-panel production. Fabrication of laminates. Cracks and scratches often appear on boards made of low-grade boards, which seriously affect the performance of the boards. This is also the place to pay attention when visualizing. Distinguish the quality of the circuit board from the appearance In general, the appearance of the PCB circuit board can be analyzed and judged through several aspects.

1. Light and color. The external circuit board is covered with ink, and the circuit board can play the role of insulation. If the color of the board is not bright and there is less ink, the insulation board itself is not good.

2. Standard rules for size and thickness. The thickness of the circuit board is different from that of the standard circuit board, and customers can measure and check according to the thickness and specifications of their own products.

3. The appearance of the weld. Because the circuit board has many parts, if the welding is not good, the parts are easy to fall off the circuit board, which will seriously affect the welding quality of the circuit board.

4. Whether the solder mask ink coverage is smooth, whether there is copper exposure, whether the character silk screen is offset, and whether the pad is attached also needs to be paid attention to.