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目前大多数电子仪器都要求符合GJB—151-86的辐射发射,传导发射,辐射敏感度,传导敏感度的要求,对于军品和出口的产品要求更严.为了使产品通过GJB-151中对于辐射发射和辐射敏感度的要求,产品必须采用屏蔽机箱.与静电屏蔽不同的是,电磁屏蔽对屏蔽体接地与否没有要求,仅要求屏蔽体是一个连续的导电体.屏蔽衬垫是保持屏蔽体连续有效的方法.常用衬垫见下表,其中斯派尔螺旋管(美国)分为普通型和高性能型两大类.普通型衬垫由不锈钢绕制而成,其主要特点是价格低、并能提供100dB以上的屏蔽效果;高性能型衬垫中镀锡铍铜绕制而成.是目前屏蔽性能最高的一种EMI衬垫(达160dB),在美国拥有包括惠普、波音等一大批用户.
At present, most electronic instruments are required to meet the requirements of GJB-151-86 for radiation emission, transmission emission, radiation sensitivity and conductivity sensitivity, and for the military products and export products, the requirements are more stringent. In order to make the product pass GJB-151 for radiation Emission and radiation sensitivity requirements, the product must be shielded chassis. And electrostatic shielding is different from the electromagnetic shielding on the shield grounding or not, only requires a shield is a continuous conductor shielding shield is to maintain the shield Continuous effective method. Commonly used in the pad below table, in which Spirel spiral tube (United States) is divided into two types of ordinary and high-performance type. Ordinary type liner made of stainless steel, its main feature is the low price , And can provide more than 100dB shielding effect; high-performance pad tin-plated beryllium copper system is currently shielding the highest performance of an EMI gasket (up to 160dB), in the United States has, including Hewlett-Packard, Boeing, etc. A large number of users.