接触阻抗英文

SMT就是表面组装技术（表面贴装技术）（Surface Mounted Technology的缩写），是目前电子组装行业里最流行的一种技术和工艺。PMC(Private Millitary Contractor），即“私营军事承包商”。它与人们通常所熟知的安保公司有所不同。在西方军事史上，私营军事承包商早已有之。美国独立战争时期的大陆军，就相当依赖私营军事承包商，由他们提供运输、木工、机械维修以及与食物和药物有关的服务。法国的拉斐特侯爵是为美国军队服务的首批军事承包商之一，他购买并装备了一艘军舰，直接加入与英军的战斗。二战后，逐渐装备了各种高科技武器的美国军队，对私营军事承包商的依赖日益增强，越南战争甚至被称为“承包下的战争”。 如今，私营军事承包商不仅承担了美军的后勤供应，而且介入到战斗任务和外交活动中。据美国布鲁金斯学会统计，在伊拉克，每１０名美军士兵就需要一名私营军事承包商的雇员为他们提供支持。目前，美军２８％的武器装备的维护保养工作由私营军事承包商进行，将来这一比例可能升至５０％。通过为美国军队提供服务，私营军事承包商们获得了巨额利润。一些在伊拉克执行战争保卫任务的私营军事承包商雇员，每天可以挣１０００美元，私营军事承包商的一名卡车司机，每年也有大约８万美元的免税收入。PMC—便携式媒体中心[编辑本段]PMC是英文“Portable Media Center ”的缩写，即 “便携式媒体中心”。微软公司统一规定了PMC的硬件规格，CPU采用了英特尔公司提供的XScale，而整体的软件框架则是微软的“Windows Portable Media Center ”操作系统，看来这次WIN-TEL阵营又将进军便携媒体市场，创立了便携媒体播放器的标准。PMC整体架构为开放式，可以在操作系统的基础上自行扩展应用软件。 DIP封装（Dual In-line Package），也叫双列直插式封装技术，双入线封装，DRAM的一种元件封装形式。指采用双列直插形式封装的集成电路芯片，绝大多数中小规模集成电路均采用这种封装形式，其引脚数一般不超过100。DIP封装的CPU芯片有两排引脚，需要插入到具有DIP结构的芯片插座上。当然，也可以直接插在有相同焊孔数和几何排列的电路板上进行焊接。DIP封装的芯片在从芯片插座上插拔时应特别小心，以免损坏管脚。DIP封装结构形式有：多层陶瓷双列直插式DIP，单层陶瓷双列直插式DIP，引线框架式DIP（含玻璃陶瓷封接式，塑料包封结构式，陶瓷低熔玻璃封装式）等。 DIP封装具有以下特点： 适合在PCB(印刷电路板)上穿孔焊接，操作方便。 芯片面积与封装面积之间的比值较大，故体积也较大。 最早的4004、8008、8086、8088等CPU都采用了DIP封装，通过其上的两排引脚可插到主板上的插槽或焊接在主板上。在内存颗粒直接插在主板上的时代，DIP 封装形式曾经十分流行。 DIP还有一种派生方式SDIP（Shrink DIP,紧缩双入线封装），它比DIP的针脚密度要高6六倍。DIP还是拨码开关的简称，其电气特性为1.电器寿命:每个开关在电压24VDC与电流25mA之下测试,可来回拨动2000次 ； 2.开关不常切换的额定电流:100mA,耐压50VDC ； 3.开关经常切换的额定电流:25mA,耐压24VDC ； 4.接触阻抗:(a)初始值最大50mΩ；(b)测试后最大值100mΩ； 5.绝缘阻抗:最小100mΩ,500VDC ； 6.耐压强度:500VAC/1分钟 ； 7.极际电容:最大5pF ； 8.回路:单接点单选择:DS(S),DP(L) 。另外，电影数字方面DIP（Digital Image Processor）二次元实际影像

您好，我的翻译结果是这样滴The appearance of 1 return wire. |. In return I burnt wire found AC Inlet PIN needle has been burning trace. II. Melting in the terminal in conjunction with the AC Inlet Pin pin has burn marks phase, such as the circle. The combination of the above two points, we can preliminary judgment appeared to plug bad contact with AC Inlet, the contact resistance increases, the contact point temperature oxidation, arcing contact terminal and the AC Inlet Pin, eventually appear serious adverse consequences of charred plug. Analysis was performed in 2 Analysis and related professionals to confirm the cause of charred with plug:|.With the size of.AC Inlet Pin needle and the terminal is abnormal. The measurement of charred AC Inlet Pin dimensions, specifications for 20*15mm, meets the requirements of the standard. Fit dimension measurement and char AC Inlet with the terminal 15mm, meets the requirements of the standard. Comparison of these data, the possible causes of charred can remove the plug.II. Due to the use of wires for a long time, there are a lot of foreign body needle AC Pin on Inlet (as shown below), these foreign bodies in the plug and fit, increases the impedance, the contacting arc, after high temperature and long time, eventually lead to plug the charred.Ⅲ. From the appearance can be seen on the conductor connected to the Pin pin the tail on the charred AC Inlet have appeared serious oxidation, also have insulation aging skin (below), can confirm that the phenomenon after high temperature oxidation caused by long time. Copper conductor with AC Inlet two other Pin pin connected no oxidation phenomenon, which can judge is connected with the tail and wire burning Pin part appears bad contact, resulting in production of electric arc, and the temperature rise, resulting in Pin needle in the plastic fixed site AC Inlet loose, appear even loose or deviation. After the plug to repeat after inserting needle, terminal Pin and plug appears with the poor, eventually lead to plug the charred.The following picture can be seen, the AC Inlet Pin pin connections and conductor blackening, connection loosening.Can be inferred from the fundamental reason for the plug eventually burn out. 3 conclusion the wire tail plug of charred, without any relationship with the wire itself quality. The Pin needle quality status and use the customer's AC Inlet, please rest assured that the use of our products望采纳