上海贝尔PCB 设计规范（Shanghai Baer PCB design specification）..docVIP

上海贝尔PCB 设计规范（Shanghai Baer PCB design specification） P C B design specification (discussion paper) Version ED, date writing, signature audit, signature approval signature 02 2001-6-19Shanghai Bell File name P C B design specification The file number is first pages, 32 pages altogether Catalog A.PCB design layout - Specification The layout design principles in. Two of the requirements of layout design and process .PCB design specification - wiring The wiring design principles in. Process for the wiring design requirements and three The design of.PCB postprocessing - Specification The test point add - in - mark PCB board Processing data file generation four Glossary - . The hole hole, hole hole, holes, shaped hole, hole - - assembly The positioning hole and optical positioning point - Negative (Negative) and positive (Positive) (Reflow Soldering) - reflow and wave soldering (Wave Solder) - - PCB and PBA 3 Three Four Fifteen Fifteen Sixteen Twenty-four Twenty-four Twenty-five Twenty-nine Thirty-one Thirty-one Thirty-one Thirty-one Thirty-one Thirty-two Version ED 02 Shanghai Bell PCB design specification second pages, a total of 32 pages Layout specification for a.PCB design (1) layout design principles 1., the distance from the edge of the plate should be greater than 5mm. 2. place the elements closely related to the structure, such as connectors, switches, power sockets, etc.. The 3. priority is to put the core components of the circuit function blocks and the larger components, and then to the core components for Center put circuit components around. 4., large power components placed in favor of heat dissipation position, such as the use of fan cooling, placed in the air The main channel; if the conduction heat dissipation, should be placed close to the chassis guide slot position. 5. the quality of the larger components should be avoided at the center of the plate, should be close to the plate in the box in the fixed edge The. 6. components with high frequen