Electromagnetic shielding room is used to isolate the electromagnetic environment of indoor and outdoor, can prevent external electromagnetic interference enter indoor, already affect indoor equipment test run, and can limit indoor electromagnetic leakage of high-power high-frequency equipment, prevent the normal operation of the surrounding equipment, is an ideal venue to EMC test or a secret room.

Doing no shielding case, our electronic equipment is subject to strong electromagnetic interference sources such as thunder lightning or indirectly lead to the influence of abnormal equipment can't work or work, the most serious case of damage, it is more common electromagnetic interference, another phenomenon is that we listen to the radio when it thunders, watch TV, use computers, radio opportunities appear "cheep" noise, TV set, computer will appear the image jitter, and so on, these are thunder and lightning interference caused by electromagnetic interference.

Computer, communication machine and electronic equipment in normal work will produce a certain intensity of electromagnetic wave, the electromagnetic wave may produce interference to other equipment or received by special equipment, in order to steal its work content.At the same time, these electronic devices also need to ensure their normal work under an electromagnetic environment less than a certain intensity.

There are many kinds of shielded dark rooms, such as the whole airwave darkroom, the half-wave darkroom, and some other types of darkrooms designed to meet the test requirements.Although different darkroom test project is different, but generally include shell shielding shell, shell inner wall combined with a layer of absorbing material layer, false wall, a dark room door, installation of equipment to be tested in the darkroom turntable and supporting device, antenna bracket system, ventilation and lighting equipment, filter, grounding, safety, and electrical devices, measuring instruments and are connected to the measuring instrument used for the interface board.Electromagnetic compatibility test items such as radiation stray disturbance test and radiation disturbance immunity test of communication equipment are generally carried out in the whole airwave dark room.The whole airwave darkroom is designed to be rectangular in order to ensure good performance in high frequency testing (such as 40GHz).

The classic net size of the airwave chamber: 9m x 6m x 6m (3m method) : the product used for rf immunity and emission test size is below 2m, which is widely used in the international field to replace the open field;11m * 7m * 9m (5m) : the performance is superior to the 3m method in the wider range, and the conversion correction relationship with the 10m method is superior to that of the 3m method.Can test the larger volume of EUT;19m * 12m x 9m (10m method) : for rf immunity and emission test, suitable for larger products.

In layman's terms, the shielding room is just a large iron box that isolates electromagnetic signals from the outside world.The dark room not only has the function of the shielding room, but also has the ferrite, pipe-point and other absorbing materials inside, so as to simulate the environment of the open space.The dark room is much more expensive than the shielding room.

Is not high requirement for experimental environment test such as conduction harassment, electrostatic test, surge test, surge test is conducted on the power cord, so only need to be done in shielding room is enough;And for space radiation, space harassment through space propagation of harassment or anti-interference has special requirements for space, so it needs to be carried out in the dark room to simulate the space of empty space.

TIEOK provides customers with standard shielding rooms, EMC dark room design, construction, equipment integration, installation, debugging, technical services and other services.The working frequency range of the shielding room after completion is 10kHz ~ 40GHz, and the relevant standard of GB/ t12190-2006 is executed.

      电磁屏蔽室用于隔离室内和室外的电磁环境，既可防止外部电磁干扰进入室内，影响室内设备的测试运行，又可限制室内大功率高频设备的电磁泄漏，防止影响周围的设备的正常工作,是EMC测试或保密机房的理想场地。

       在没有做屏蔽的情况下，我们的电子设备会受到直击雷或间接雷等强电磁干扰源的影响导致设备无法工作或工作出现异常，最严重时出现损坏，这是比较常见的电磁干扰显现，另外一种现象就是，我们在打雷的时候听收音机，看电视，使用电脑，收音机会出现“吱啦”的噪音，电视机，电脑会出现图像抖动等等，这些都是雷电产生的干扰造成的电磁干扰。

      计算机、通信机及电子设备在正常工作时会产生一定强度的电磁波，该电磁波可能会对其它设备产生干扰或被专用设备所接收，以窃取其工作内容。同时，这些电子设备也需要在小于一定强度的电磁环境下保证其正常工作。

      屏蔽暗室种类有多种，如全电波暗室、半电波暗室、还有一些为满足测试要求而设计的其他类型暗室。虽然不同暗室的测试项目不同，但一般均包括外壳屏蔽壳体、外壳内壁结合一层吸波材料层、假墙、暗室门、安装在暗室内的被测设备的转台及其支撑装置、天线支架系统、通风照明设备、滤波器、接地、安全及电气装置，测量仪器以及用于与测量仪器相连的接口板。通信设备的辐射杂散骚扰度测试和辐射骚扰抗扰度测试等电磁兼容测试项目一般在全电波暗室进行。全电波暗室一般设计为矩形，是为了保证在高频测试(如40GHz)中仍能保证其很好的性能。

      电波暗室的经典净尺寸：9m×6m×6m（3米法）：用于射频抗扰度及发射测试尺寸在2m以下的产品，是国际上普遍采用的代替开阔场的实验场地；11m×7m×9m（5米法）：性能在较宽范围内都比3m法电波暗室优越，且与10m法的换算修正关系较之3m法对10m法的换算修正关系更优越。可以测试较大体积的EUT；19m×12m×9m（10米法）：用于射频抗扰度及发射测试，适用于体积较大的产品。

      通俗来说，屏蔽室只是一个大铁箱子，把外界的电磁信号进行隔离；而暗室不仅有屏蔽室的功能而且内部贴了铁氧体、辟尖等吸波材料，为的是模拟空旷场地的环境。暗室比屏蔽室贵很多就是贵在暗室内贴的这些材料上面。  

      对实验环境要求不高的测试比如说传导骚扰、静电测试、浪涌测试、雷击测试等都是通过电源线上进行的，所以只需要在屏蔽室内进行就够了；而对于空间辐射、空间骚扰通过空间传播的骚扰或者是抗干扰则对空间有特殊要求，因此需要在暗室内进行，模拟空旷场地的空间。   

      TIEOK公司为客户提供标准屏蔽室、EMC暗室的设计、建造、设备集成、安装、调试、技术服务等一系列完善服务。竣工后的屏蔽室工作频率范围为10kHz～40GHz，执行GB/T12190-2006相关标准。

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