Three anti paint has satisfactory high and low temperature resistance; It cures into a transparent film that tries to protect the circuit from damage in such conditions as chemicals, shock, moisture, salt spray, moisture and high temperatures.
As time goes by, the size of the high-performance chip increases, the number of Solder Bump increases, and the substrate becomes thinner and thinner. In order to improve the reliability of the product, it is necessary to fill the bottom.
For RF microwave signal transmission line, or preferred to walk the arc line, or even to walk the "45° external miter" line
PCB processing belongs to OEM customers OEM products, not the same customer customized products are different, so PCB processing there is a variable price.
If the contact or line on the PCB circuit board needs to contact with the parts over and over again, with the passage of the product office hours, the appearance of the metal will reveal a certain wear, so the contact is not good.
PCB proofing refers to the trial production of PCB before mass production. After the electronic engineer presets the circuit and completes the PCB Layout, he carries out the process of small batch trial production to the factory, that is, PCB proofing.
Specific office process: incoming materials → inspection data → visual inspection → conforming to standards →FQA sampling → conforming to standards → packaging → not suitable for standards → disposal → investigation.
PCBA test stand is an indispensable test tool in SMT patch processing and production. It mainly tests the produced circuit board, and determines whether the board is a good product by the detected signals, pictures, sound temperature and so on.
1. Complete PCB board making file (Gerber file, position map, steel mesh file) and board making requirements; 2. 2. Complete a BOM(including the model, brand, package, and description). 3. PCBA assembly drawing
Circuit board composition: 1, welding plate: 2, layer number: 3, hole: 4, components: 5, wiring: 6, silk screen: 7, welding resistance layer: 8, positioning hole: 9, filling: 10, electrical boundary:
Vacuum in this context refers to the negative pressure in the operating area of the system and the low suction force just enough to prevent the etching fluid from creating a puddle effect.
PCB is also known as the Printed Circuit Board (Printed Circuit Board), it can realize the circuit connection between electronic components and function realization, is also an important part of the power supply circuit design.
Telegram