NEBS认证——辐射抗扰度和传导抗扰度

介绍了NEBS认证对待认证设备抗扰度的要求,包括设备的辐射抗扰度要求和设备对外端口的传导抗扰度要求。辐射抗扰度除了规定频率范围内的测试外,还要求在美国的一些专用频点及设备的工作频点上进行测试。传导抗扰度要求用电流注入法进行测试,不能用电压耦合法测试。传导抗扰度测试除了规定频率范围内的测试外,也要求在设备的工作频点上进行测试。     

比较NEBS与CE认证中的EMC要求

在CE认证的基础上,从EMC方面介绍分析NEBS要求(按Level3级)与其区别,以便改进现有设计并在产品中考虑到NEBS需求,更好地满足北美市场的需要.主要比较静电放电、辐射抗扰、电快速瞬变/脉冲群、浪涌(冲击)、传导抗扰、稳态电力线感应抗扰度、DC电位差抗扰度、AC/DC失效测试、机架EFT测试、机架浪涌测试,以及传导发射、辐射发射等项目.     

NEBS认证——设备DC端口的性能要求

NEBS认证对设备DC端口的性能要求是GR-1089-CORE Issue 4,June2006版本中新增加的部分。这部分标准适用于由共用DC电源供电的通信设备,认证要求主要参考ANSIT1．315：2001《电信环境中DC电源供电设备的电压等级》。NEBS认证对DC端口的性能要求主要有四个方面的内容：一是设备DC端口最大和最小工作电压范围;二是设备Dc端口抗瞬变高压和低压的能力;三是设备DC端口差模噪声发射;最后是设备DC端口差模噪声抗扰度要求。     

NEBS认证—传导发射

介绍了 NEBS 认证测试中对待认证设备对外端口传导发射的要求,其中有电源端口、信号端口、模拟音频端口和通信端口的传导发射要求。交流端口的传导发射要求测试噪声电压和噪声电流,其他端口要求测试噪声电流,不能用测试噪声电压代替噪声电流的测试。     

NEBS认证一系统级静电放电

NEBS认证规定了设备正常运行、安装和维修等状态下的静电放电抗扰度测试。介绍了待认证设备在三种状态下的静电放电电压、测试点的选取及测试方法。如果待认证设备是静电敏感设备,NEBS认证还有一些特殊的附加要求。通过对NEBS认证与CE认证差别的比较分析,为企业的产品认证提供帮助。     

NEBS认证——电源端口和室内端口的雷击浪涌

介绍了NEBS认证对电源端口和室内通信端口的雷击浪涌测试要求。其中,室内通信端口分为使用屏蔽线的端口和使用非屏蔽线的端口;AC电源端口分为有浪涌保护器的端口和没有浪涌保护器的端口。对于DC端口,NEBS认证对室外设备的Dc端口有浪涌测试要求,而对室内设备的DC端口没有浪涌测试要求。     

NEBS认证——系统级静电放电

NEBS认证规定了设备正常运行、安装和维修等状态下的静电放电抗扰度测试.介绍了待认证设备在三种状态下的静电放电电压、测试点的选取及测试方法.如果待认证设备是静电敏感设备,NEBS认证还有一些特殊的附加要求.通过对NEBS认证与CE认证差别的比较分析,为企业的产品认证提供帮助.     

POE端口的电磁兼容测试

介绍了POE技术及其两种供电方式,并针对POE端口的传导骚扰（CE）测试、射频场感应的传导骚扰抗扰度（CS）测试、电快速瞬变脉冲群抗扰度（EFT）测试和浪涌（冲击）抗扰度（Surge）测试,提出了根据POE端口的具体供电方案来选择测试方法的建议。     

非平衡E1接口的EMC设计

EMc设计与接口设计紧密相关,很多产品的EMC指标都是由接口来实现的.E1接口广泛使用于欧洲和中国的通信产品中,通过对非平衡El接口的EMC设计分析,提供了EMS设计和EMI设计的全套解决方案.经过试验验证,非平衡E1接口的EMC设计电路完全满足CE认证设备对外接口的静电放电抗扰度、电快速脉冲群抗扰度、浪涌抗扰度和传导发射的要求.     

电快速瞬变脉冲群抗扰度误码率测试系统方案

很多电子通讯设备在出厂时都会做电快速脉冲群瞬变抗扰度试验,但一般都只是测试设备是否被高压脉冲群损坏。本文介绍自主设计的系统,可以在高压脉冲群干扰的同时测试被测设备的通讯误码率。     

A practical approach to testing electronic equipment forsusceptibility to AC line transients

Modern electronic equipment is very susceptible to damage due to AC line transients. This paper describes a relatively simple procedure for testing the equipment for susceptibility to line transients and describes some low cost equipment for performing two types of simulated tests. The susceptibility of the equipment under test, based on the test results, is assessed     

基于雷达系统功能的软件测试方法

面对软件高度集成的现代雷达系统,以装备试验学和软件工程学作为理论基础,对雷达系统软件战术指标测试方法进行研究。提出基于系统功能的软件测试方法,用软件测试角度,从雷达系统专业背景考虑,对战术指标进行考核验证,以期通过软件测试发现系统缺陷而不仅仅是软件缺陷。依据相关装备试验原理和软件测试原理,将装备软件测试与装备专业理论相结合,确定测试用例设计方法、等价类划分准则和集合元素选取准则。提出测试策略和测试方法说明。实现从雷达系统专业领域知识对雷达系统软件战术指标进行考核验证的研究目的。     

复杂通信电磁环境构设应遵循的几个原则

复杂电磁环境下的装备性能是我军试验和训练的重点,复杂电磁环境构设方法越来越引起装备试验训练方的重视。本文主要是对如何设置所需的复杂通信战场电磁环境方法进行探讨,重点研究复杂战场电磁环境设置应遵循的几个原则,为装备训练和试验等任务设置复杂通信电磁环境提供参考。     

A new concept for test equipment for testing large HV and UHV cables on-site

The number of projects involving long and extra long HV and UHV AC cables as well as HVDC cable connections can be observed to increase (Cao et al., 2008; Kabouris et al., 2006). At the same time, operating voltage levels are increasing, accentuating the need for more powerful on-site test systems needed to prove the integrity of the insulation before energization. Low cost and ease of operation are other important features of such systems. As a matter of fact, traditional methods and test systems for routine and on-site testing of these cables come to their limit – technically and economically – as the lengths and voltage levels increase (Marelli, 2008). The logistics for the arrangement of tests as well as the testing itself are challenging (Schr?der et al., 2006). Development of power electronics has now made it possible to realize high voltage DC interconnections that do not exhibit polarity reversal at reversal of power flow. As a result of this, extruded XLPE cables are now coming to the fore in high voltage DC application, although methods and test equipment for routine and on-site testing show some open issues so far. Space charges in the insulation, initiated by the test voltage during testing, are unacceptable, and this leads to the requirement that testing must be made at an alternating voltage, which can be very low frequency without creating space charge. Available test equipment for power frequency testing is not feasible for testing extruded DC cables, among other reasons, due to the lengths usually associated with DC cables. These open issues can be solved with a newly developed on-site test system that provides the reliability of established test methods and test equipment, but exhibiting lower weight, dimensions and power consumption compared to existing systems. At the same time, the on-site test system as well as the prearrangement of the tests and the testing itself are less cost intensive. Extra long cables (i.e. high capacitance) could be tested with the equipment, which by virtue of its smaller dimension is easier to handle and thus reducing the testing logistics dramatically. For example where one of the systems on the market would require two trailers of equipment for a test on a high voltage cable, only a single trailer would be needed with the new system, or a roll on/roll off test can be carried out without the use of any crane on-site. A reduction in weight by a factor of 3 is expected compared to today’s on-site test equipment, a gain which also is reflected in reduced volume.     

On-chip characterisation of RF systems based on envelope response analysis

A simple on-chip procedure for testing embedded RF blocks is presented. It is based on the detection and spectral analysis of the two-tone response envelope of the device under test (DUT). A main difference with similar methods is its inherent simplicity, avoiding a preprocessing stage and resorting to simpler circuitry to process the envelope. As a consequence, the main nonlinearity specifications of the DUT can be easily estimated from the envelope signal without the need of expensive RF test equipment.     

The Computer-Aided Approach to Susceptibility Testing

Susceptibility testing is generally performed using manual methods which result in the following disadvantages and limitations: tests are time consuming, frequency and amplitude accuracy may not be satisfactory, operator errors can easily occur, and test setup inaccuracies are seldom taken into account and compensated. A new and low-cost method of performing susceptibility testing automatically is presented in this paper. With the advent of test instrumentation operated under digital control and the availability of standardized interface systems, it is now possible to build test systems to carry out automated susceptibility tests which are particularly advantageous when digital equipment are to be tested. By driving power amplifiers from programmable sweep generators, the repeatability and accuracy of the testing will be considerably increased as a result of accurate frequency and amplitude controls using control loops (AFC and ALC). A computer can be used to control and to manage the execution oftests as well as the processing of off-line test results. Major advantages given by the automation of susceptibility testing are increased measurement accuracy, reduction of testing costs and EMC-problem prediction capabilities.     

电子元器件和电子设备的ESD试验方法比较

主要针对电子元器件和电子设备静电放电试验方法进行了对比分析，包括试验针对的产品对象、依据的试验标准、需要的试验设备以及具体的试验方法和合格判据等。     

固定式健身器材有关变形量测试的研究

该文研究了固定式健身器材有关标准涉及变形量测试的内容,并结合各类具体产品：力量型训练器材、曲柄踏板类训练器材、跑步机、划船器、踏步机、椭圆训练机、带固定轮或无飞轮的健身车,分别详细介绍了各自变形量测试的安全要求和试验方法。     

高温箱内空气循环对热测试的影响与对策

通过热测试和热仿真试验来验证高温箱内空气循环对自冷设备高低温环境试验的影响。查阅相关的国内外标准并结合多年的热测试经验,提出一套标准试验程序和简易的测试方法,对自冷设备热测试或高低温环境试验有指导作用和应用价值。