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. Gap2. 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同样的方向，只要标识可按相同方向辨识即可（从左到右或从上到下）.