In recent years, almost one person has more than one electronic device, and the electronics industry has developed rapidly, which has also promoted the rapid rise of the PCB circuit board industry. In recent years, people have higher and higher performance requirements for electronic products, which has also led to higher and higher requirements for the quality of circuit boards. How to distinguish the quality of PCB circuit boards has become a topic of increasing concern.
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 check whether the thickness and size of the board meet the thickness and specifications you need. If it does not, you need to re-make it. 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, and cem-3 sheets have poor performance and are easy to deform, and can only be used for single-sided production, while fr-4 fiberglass panels are much better in strength and performance, and are often used in double-sided and multi-sided panels. The production of laminates. The boards made of low-grade boards often have cracks and scratches, which seriously affect the performance of the boards. This is also where you need to focus on visual inspection. In addition, whether the solder mask ink coverage is flat, whether there is copper exposed; whether the character silk screen is offset, whether the pad is on or not also needs attention.
After the second method needs to be used, it comes out through performance feedback. First of all, it can be used normally after the components are installed. This requires that the circuit board has no short circuit or open circuit. The factory has an electrical test process during production to detect whether the board has an open or short circuit. However, some board manufacturers save The cost is not subject to electrical testing (Proofing at Jiezi, 100% electrical testing is promised), so this point must be clarified when proofing the circuit board. Then check the circuit board for heat generation during use, which relates to whether the line width/line distance of the circuit on the board is reasonable. When soldering the patch, it is necessary to check whether the pad has fallen off under high temperature conditions, which makes it impossible to solder. In addition, the high temperature resistance of the board is also very important. An important index of the board is the TG value. When making the plate, the engineer needs to instruct the board factory to use the corresponding board according to different usage conditions. Finally, the normal use time of the board is also an important indicator to measure the quality of a board.
When we buy circuit boards, we can’t start from the price alone. We should also consider the quality of the circuit boards and consider all aspects before we can buy cost-effective circuit boards.