浅谈通信设备的清洗与静电平衡维护

通常,由于空气污染（见表1）和通信设备机房环境的限制,设备送风系统、机房改造及装修等原因,使得空气中的灰尘、油污、潮气、盐份、腐蚀性气体等“综合污染”不可避免的粘附在设备上;设备正常工作中的电磁场分布及感应、送风系统长时的摩擦、物体与设备的接触分离都会产生大量的“累积静电”并分布在设备上。     

重启电风扇的注意事项

1.晾晒驱散潮气再启用。使用前,将电风扇置于日光下晒几小时,驱散内部的潮气,避免漏电。2.检修破损插头电源线。检查插头是否破损,连接导线有无破露,若有则应及时修理或更换后才能使用。3.检查加固螺丝防松动。检查风叶和网罩及各部位的固定螺丝是否松动,要安装牢固再用。特别是屋顶上的吊扇,要全面检查加固是否牢固,防止零件甚至整个吊扇脱落伤人。4.清除表面灰尘和油污。灰尘和油污对电机等器件有腐蚀性,所以每月在停机时断开电源,要进行一次表面清洁工作。5.转动部分注油防干磨。每年启用前应往加油孔内注入润滑油;齿轮箱内的润滑油3年换一次即可,使之增加电扇使用寿命。6.使用前先进行试运转。启用前应试运转2~3小时,待运转正常后才能继续使用。若有焦糊味或发现冒烟,应立即切断电     

精密电子设备清洗维护的几个关键技术问题

精密电子设备清洗维护技术,近几年在我国逐渐兴起.它是伴随着现代工业、计算机、通讯、IT业和科学技术的迅猛发展和精密电子设备日常维护的需要而产生和建立的。 我们知道,各种不同类型的精密电子设备在长期连续运行中,无一例外地都要受到环境因素的影响。这些设备在其降温送风系统和自身的电磁场作用下.环境中的灰尘,油污,潮气,盐份,静电,带电粒子,     

玻璃-金属封接的新方法

本文介紹一种利用高靜电場封接玻璃-金属的新技术,封接溫度比玻璃的軟化点一般低大約200～400℃。因为不需要中間材料,所以这种封接,如同在高于軟化点的溫度下进行的普通封接一样不受污染。在加上200～2000伏电压时,匹配很好的表面在大約一分钟之內便完成封接。封接是在空气、还原气体及惰性气体中进行的。巳同商售玻璃进行匹配封接的金属,有可伐、各种鈇-鎳合金及硅等。     

光驱激光头的清洗和调整

众所周知,光驱依靠激光头来识别、读取光盘信息和拾取各种伺服误差检测信号,因此一旦激光头出现故障,光驱就不可能正常工作和使用。在维修光驱时,光学模组的故障率较高,而其中因积有一定尘埃、粉粒等杂物导致光学模组故障占绝大多数。一般灰尘吸附于在激光头的两具部件,即物镜表面和激光头内部。 物镜表面清洗物镜表面的灰尘较明显,易于判断。正常的物镜表面应光亮、干净、呈锃蓝色,且无伤痕和表面蓝色薄膜脱落变色、变形现象。物镜表面灰尘的清除切忌使用酒精、磁头清洁剂等任何有机溶剂,而应选用洁净的镜头纸或无水脱脂棉进行清…     

覆铜板用基材CTI提升

线路板用绝缘基材的表面受到尘埃附着、水份结露或潮气和具有正负离子污染物的污染时，在外加电压作用下其表面的泄漏电流比干净的表面要大得多。该泄漏电流产生的热量蒸发潮湿污染物，使绝缘基材的表面处于不均匀的干燥状态，导致基材表面形成局部干燥点或干燥带。干区使表面电阻增大，这样电场就变得不均匀，进而产生闪络放电。在电场和热的共同作用下，绝缘材料表面碳化，碳化物电阻小，促使施加电压的电极尖端形成的电场强度增大，因而更容易发生闪络放电。线路间反复发生闪络放电产生电火花，进而形成炭化导电电路的痕迹，破坏基材表面绝缘性能，形成导电通道，产生漏电起痕。CTI即是反应绝缘材料表面在有电位差存在下形成碳化导电通路，使之失去绝缘性能的指标。CTI值越大其耐漏电起痕指数越高，绝缘性越好。     

空气净化器常识

空气净化器是一种新型家用电器,它具有自动检测烟雾、滤去尘埃、消除异味及有害气体、双重灭菌等功能。空气净化器通常由高压产生电路、负离子发生器、微风扇、空气过滤器等系统组成。主要有以下三种类型:一是过滤吸附型:利用多孔性滤材,如无纺布、滤纸、纤维、泡棉等(目前吸附能力最强的滤材为HEPA高密度空气滤材),吸附空气中的悬浮颗粒、有害气体,从而净化空气:二是静电集尘型:通过电晕放电使空气中污染物带电,使用集尘装置收集带电粒子,达到净化空气的目的;三是复合型:同时利用过滤和静电除尘方式,净化空气。从原理上讲,三种净化空气方式对室内空气都有一定净化能力,但在实际使用中,市场上的产品使用效果却各不相同,这又是怎么回事呢?     

小议变电站GIS设备安装与调试技术

GIS的定义为：全部或部分采用气体而不采用处于大气压下的空气作为绝缘介质的金属封闭开关设备。它是由短路器、母线、隔离开关、电压互感器、电流互感器、避雷器、套管7种高压电器组合而成的高压配电装置。GIS组合电器特别适合在用地紧张的城市变电站、企业变电站、山区和污秽严重的地区使用。本文探讨分析了变电站GIS设备安装及调试技术。     

电子材料的腐蚀

计算机及其周边元器件中所使用的各种电子材料在大气环境下，因潮湿及其它条件下发生大气腐蚀，从而使电子科技材料腐蚀、电子系统发生故障、如短路、电接触不良等。文中就因污染空气、塑料材料分解气体等导致的电子材料大气腐蚀现象作论述。     

饮水机应时常清洗

饮水机是利用空气压力的原理工作的,空气中含有的众多细菌、灰尘及其它有害物质均可能通过透气孔进入饮水机:部分矿物质在饮水机内胆加热元件的表面会形成大量水垢;停用一段时间或处于高温高湿度的饮水机,也可能造成水质的再次污染;在换水过程中饮水机进水口暴露在外,也可能被污染。因此笔者建议广大饮水机用户,应时常给饮水机“洗洗肠”来保护人体的健康。     

Progress in electrophotography in Western Europe

A review is given of the progress in electrophotographic science and technology in Western Europe during the years 1967 to early 1971. University research work is mainly directed towards two areas: 1) the electrical and physical properties of photoconductors, such as selenium, chalcogenides, oxides, and organic materials; and 2) the sensitization of these photoconductors. Industrial research teams report on the preparation of electrophotographic layers on development and on image evaluation. A bibliography including scientific papers and patents published on this subject during said period completes this review.     

智能通信在楼宇自控系统中的应用

随着计算机技术、控制技术、通信技术及信息技术的飞速发展,人们对生活、办公环境安全性、舒适性的要求日渐增长,智能建筑应运而生。楼宇自动化控制系统是智能建筑的一个重要组成部分。通过结合具体的智能楼宇控制工程项目,在介绍系统概况的基础上,给出了系统的总体设计方案及子系统的监控方案,具有一定的实用价值。     

Advances in millimeter-wave subsystems in Japan

The authors describe the development trends and results of millimeter-wave systems in Japan in such fields as communication, radar, and measurement systems. The applications included are the W-40G waveguide transmission communication system, an automobile traffic control system using the 60-GHz band, a collision avoidance radar system for an automobile, a plasma electron density measuring system, and satellite communication. The authors describe the development of devices such as high-power FET amplifiers, traveling wave tube amplifiers (TWTAs), IMPATT amplifiers, low-noise amplifiers, and monolithic microwave integrated circuit (MMIC) devices used in constructing the millimeter-wave systems     

General Trend in Electrical Communications in Japan

Systems are currently being designed for higher reliability and greater economy. Larger transmission capacity is required to meet a rapid increase in recent communication demands instigated by the introduction of video and information communications facilities. More flexibility, to deal with the variety of communication modes to come, and smaller hardware dimensions, to overcome situations caused by the high population density, seem to be particularly sought in the communication technology of Japan. Research and development concentrate on these objectives. The following is an explanation of the present state of the art and general trends in this country.     

Progress in display-device development in Western Europe

A review of the basic research and industrial development of display devices in Western Europe during the years 1968 to early 1973 will be given. The display types considered are: 1) active displays such as cathode ray tubes, light-emitting diodes, electroluminescence cells, and gas discharge devices, and 2) passive displays such as laser displays, light valves, and ferroelectric and liquid-crystal devices.     

Designing in reliability in advanced CMOS technologies

Assessment of design implications due to degradation of CMOS devices is increasingly required in the latest technologies. This paper presents selected topics relevant to realize an efficient design-in reliability methodology in the latest generation CMOS technologies. NBTI is discussed in terms of characterization using On-The-Fly (OTF) methodology. Extension of OTF method is discussed using bias patterns to gain insights into NBTI under analog operation. A reliability simulation methodology is discussed against requirements for optimization and integration within an existing design flow. The features of this methodology are illustrated using some simple design examples.     

Switching conduction in ion-irradiated layers in GaAs

Experiments have been performed to investigate whether switching phenomena are observable in ion-irradiated GaAs. It is found that the V/I characteristics of H2+-and N+-irradiated layers show both negative resistance and switching from a high resistance to a low resistance state. Ion irradiation may thus be a useful method of fabricating switching devices.     

Electricity in China-generation in the People's Republic

Before the establishment of the People's Republic, China was a semi-colonial, semi-feudal society plagued by foreign interventions and internal power struggles. It was against this background that the electrical industry went through its infancy. Today, the People's Republic of China is facing an acute energy shortage, posing a problem which must be quickly overcome if the country's rapid industrialisation is to continue as planned. The author presents a brief history of power generation in China from 1949 to 1983 and examines possibilities for the future