Method for distinguishing between good and bad PCB circuit boards
The information comes from:the Internet posted on:2023-04-19
Everyone is familiar with the application of PCB circuit boards, which can be seen in almost all electronic products. With the development of science and technology, the industrial production of PCB circuit boards continues to increase, and people's requirements for the number of layers, accuracy, and reliability of components are becoming increasingly high. There are many types of PCB circuit boards in the market, and the quality is difficult to distinguish.
PCB circuit board
1、 Judging from appearance.
1. Weld appearance
Because there are many PCB parts, if the welding is not good, the PCB parts are very easy to fall off, which seriously affects the welding quality and appearance of the PCB, so solid welding is very critical.
2. Size and thickness of standard rules
Users can measure and check the thickness of PCB circuit boards compared to standard circuit boards.
3. Light and Color
External PCB circuit boards usually have the effect of ink covering the insulation layer. If the color of the circuit board is not bright and there is less black ink, the insulation board itself is not very good.
2、 Judging from the sheet metal.
1. Generally, HB cardboard is cost-effective and prone to deformation and cracking. Only a single sided aluminum substrate can be made, and the surface color of the components is dark brown with an unpleasant odor. The copper coating is not smooth and thin.
2. Single sided 94V0.CEM-1 board, relatively higher in price than cardboard, with a light color on the surface of the components [sensitive word], mainly used for the fire rating requirements of industrial boards and power boards.
3. Fiberglass board has high cost, good strength, and double-sided green color. Basically, this material is used for most PCB circuit boards. The application of copper can be very sensitive and precise, but relatively speaking, the unit board is also very heavy. No matter what color is printed, the ink on the PCB circuit board should be smooth and flat, and there should be no false wires exposing copper or bubbles.
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