IPC-A-610国际标准中英文对照4.6.2Heatsink-Contact散热片――接触片arget-Class1,2,3目标——等级1,2,3·Componentandheatsinkareinfullcontactwiththemountingsurface.组件和散热片与安装表面完全接触·Hardwaremeetsspecifiedattachmentrequirements.部件满足规定的接触要求。Figure图4-641.Heatsink散热片Acceptable-Class1,2,3可接受的——等级1,2,3·Componentnotflush.组件不平齐·Minimum75%contactwithmountingsurface.至少有75%与安装表面接触·Hardwaremeetsmountingtorquerequirementsifspecified.如果有规定，部件满足安装的转距要求Figure图4-651.Gap2.Heatsink间隙散热片Defect-Class1,2,3缺点——等级1,2,3·Componentisnotincontactwithmountingsurface.组件没有接触到安装表面·Hardwareislooseandcanbemoved.部件松弛可以移动。Figure图4-661.Heatsink2.Gap散热片间隙5.1Orientation方向5.1.1Orientation-Horizontal方向——水平Target-Class1,2,3目标——等级1，2，3•Componentsarecenteredbetweentheirlands.组件位于焊盘中央•Componentmarkingsarediscernible.组件标识清晰可见•Nonpolarizedcomponentsareorientedsothatmarkingsallreadthesameway(left-to-rightortop-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-Class1,2,3可接受的——等级1，2，3•Polarizedandmultileadcomponentsareorientedcorrectly.有极性和多引脚的组件应按正确方向安装。•Whenhandformedandhand-inserted,polarizationsymbolsarediscernible.当手工成型及手插件时，极性符号可以辨识。•AllcomponentsareasspecifiedandterminatetoFigure图5-2correctlands.所有组件都符合规定并连接到正确的焊盘上。•Nonpolarizedcomponentsdonotneedtobeorientedsothatmarkingsallreadthesameway(left-torightortopto-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）.5.1.1Orientation-Horizontal(cont.)方向——水平（续）Defect-Class1,2,3缺点——等级1，2，3•Componentisnotasspecified(Wrongpart).组件不符合规定（组件错误）•Componentnotmountedincorrectholes.组件没有安装在正确的孔中。•Polarizedcomponentmountedbackwards.有极性组件安装方向相反。•Multileadedcomponentnotorientedcorrectly.Figure图5-3多引脚组件的安装方向不正确。5.1.2Orientation-Vertical方向——垂直Target-Class1,2,3目标——等级1，2，3•Nonpolarizedcomponentmarkingsreadfromthetopdown.无极性组件的标识可以从上至下辨识•Polarizedmarkingsarelocatedontop.极性标识位于顶部.Figure图5-4Acceptable-Class1,2,3可接受的——等级1，2，3•Polarizedpartismountedwithalonggroundlead.极性组件安装时有长的接地引脚•Polarizedmarkinghidden.极性标识被隐藏起来•Nonpolarizedcomponentmarkingsreadfrombottomtotop.无极性组件标识可以从底至上辨识。Figure图5-5Defect-Class1,2,3缺点——等级1，2，3•Polarizedcomponentismountedbackwards.极性组件安装反向。Figure图5-65.2Mounting安装5.2.1Mounting-Horizontal-AxialLeaded-SupportedHoles安装——水平——轴向引脚——有支撑孔Target-Class1,2,3目标——等级1，2，3•Theentirebodylengthofthecomponentisincontactwiththeboardsurface.整个组件本体长度与线路板表面完全接触•Componentsrequiredtobemountedofftheboardare,atleast1.5mm[0.059in]fromtheboardsurface;e.g.,highheatdissipating.需要离开线路板表面安装的组件至少要离开线路板Figure图5-7平面1.5mm（0.059in），如高散热器件.Figure图5-85.2.1Mounting-Horizontal-AxialLeaded-SupportedHoles(cont.)安装——水平——轴对称引脚——有支撑孔Acceptable-Class1,2可接受的——等级1，2，3•Themaximumspacebetweenthecomponentandtheboardsurfacedoesnotviolatetherequirementsforleadprotrusion(see5.2.7)orcomponentheight(H).Figure图5-9((H)isauser-dete...
