IPC-A-610 国际规范中英文对照 4.6.2 Heat sink-Contact 散热片――接触片 arget-Class 1,2,3 目标——等级 1,2,3 · Component and heatsink are in full contact with the mounting surface. 组件和散热片与安装表面完全接触 · Hardware meets specified attachment requirements. 部件满足规定的接触要求。 Figure 图 4-64 1. Heat sink 散热片 Acceptable-Class 1,2,3 可接受的——等级 1,2,3 · Component not flush. 组件不平齐 · Minimum 75% contact with mounting surface. 至少有 75%与安装表面接触 · Hardware meets mounting torque requirements if specified. 如果有规定，部件满足安装的转距要求 Figure图4-65 1. Gap 2. Heat sink 间隙散热片 Defect-Class 1,2,3 缺点——等级 1,2,3 · Component is not in contact with mounting surface. 组件没有接触到安装表面 · Hardware is loose and can be moved. 部件松弛可以移动。 Figure图4-66 1. Heat sink 2. Gap 散热片间隙 5.1 Orientation 方向 5.1.1 Orientation-Horizontal 方向——水平 Target-Class 1,2,3 目标——等级 1，2，3 • Components are centered between their lands. 组件位于焊盘中央 • Component markings are discernible. 组件标识清晰可见 • Nonpolarized components are oriented so that markings all read the same way (left-to-right or top-to-bottom). Figure 图 5-1 无极性组件的方向应使其标识都能按同样方式进行辨识 （从左到右或从上到下） Acceptable-Class 1,2,3 可接受的——等级 1，2，3 • Polarized and multilead components are oriented correctly. 有极性和多引脚的组件应按正确方向安装。 • When hand formed and hand-inserted, polarization symbols are discernible. 当手工成型及手插件时，极性符号可以辨识。 • All components are as specified and terminate to Figure 图 5-2 correct lands. 所有组件都符合规定并连接到正确的焊盘上。 • Nonpolarized components do not need to be oriented so that markings all read the same way(left-to right or top to-bottom). 无极性的组件不需要按...
