/How to distinguish the quality of PCB circuit board passing?
The application of PCB circuit board will be familiar to everyone, and it will be seen almost in all electronic products. There are many kinds of circuit board in the market.For this, jing bang technicians will teach you how to distinguish PCB circuit board good or bad?
PCB circuit boards
I. judging from appearance:
1. Weld appearance.
Due to the large number of PCB circuit board parts, if the welding is not good, the circuit board parts are easy to fall off, which seriously affects the welding quality and appearance of the circuit board. Careful identification and strong interface are very important.
2. Standard rules for size and thickness.
As the PCB circuit board has different sizes for the thickness of the standard circuit board, users can measure and check according to the thickness and specifications of their own products.
Light and color.
Usually, 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, less ink, indicating that the insulation board itself is not good.
Ii. Judging from panel materials:
1. Ordinary HB board and 22F are cheap and easy to be deformed and broken, and can only be made into a single panel. The color of the component surface is dark yellow, with stimulating smell, and the copper coating is rough and thin.
2. Single 94V0, CEM-1 board, the price is relatively higher than cardboard, the color of component surface is light yellow, mainly used for industrial board and power plate with fire rating requirements.
3. Fiberglass board, with high cost and good strength, is green on both sides. Basically, most double-sided and multi-layer hardboard are made of this material. Copper coating can be very precise and fine, but relatively speaking, the unit board is also heavy.
PCB PCB no matter what color of printing ink to smooth, smooth, no false line exposure copper, no blistering, easy to fall off phenomenon, characters should be clear, the oil through hole cover can not have a batch front.
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