This paper analyses detailedly some problems that the beginner often meet with in using Protel 99,such as sheet template manage,hierarchical circuits design,flexible using of the global revision function,auto annotation and grouping components,setting up internal planes,inserting circuit schematics into WORD document,etc.
深入分析了一些初学者使用 Protel 99设计软件时常见的技术问题 ,如图纸的模板管理、层次电路图设计、整体修改功能的灵活运用、自动标注和元件合并、如何建立内电层及原理图嵌入 WORD文档等等问题 ,结合作者几年来的教学及 PCB设计经验 ,给出了解决这些问题的方法。
Through comparison of different turning method, such as wet process shaping and joinning,one piece integral turning and numerical control turning,the advances of numerical control are described,such as simple service,size precesion,light bahour power etc.
通过湿修湿接、整体立修与数控修坯的对比 ,重点阐述其在应用中具有操作简单、尺寸精确、劳动强度低等优点。
