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.
Maintain the integrity of signal transmission and prevent the "ground projectile phenomenon" caused by the division of ground wire.
The preliminary preparation contains the preparatory component library and schematic diagram. Before PCB planning, the schematic SCH component library and PCB component packaging library should be prepared first.
The correct screen printing layer character placement criteria is: "no ambiguity, see stitches, beautiful and generous".
PCB board is a closed electronic device, is the electronic component of the support body, is the electronic component of the electrical joint carrier. HDI board is a high density interconnected circuit board.
If the PCB circuit board has the functional requirements and the demand to reduce the cost, Shen Yin is a good choice; With the outstanding flatness and touch of silver sinking, it is more appropriate to choose the silver sinking process.
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