CE认证中EMC的ClassA和B区别
关于欧洲多媒体产品标准 EN 55032(CISPR 32 ) © IEC:2012，条款4如下所描述，关于Class A与Class B的产品查阅描述。[*]Class B，主要用于住宅环境的设备，旨在为住宅环境中的广播服务提供足够的保护。主要用于住宅环境的设备应符合 B 类限制，所有其他设备应符合 A 类限制。
[*]Class A，所有其它不属于住宅环境的其它设备，均应符合 A 类限制。
4 Classification of equipment
This standard defines Class A equipment and Class B equipment associated with two types of end-use environment.
Class A equipment is equipment which meets the requirements given in Table A.2, Table A.3, Table A.8, and Table A.10, using the limitations defined in Table A.1 and Table A.7.
Class B equipment is equipment which meets the requirements given in Table A.4, Table A.5, Table A.6, Table A.9, Table A.11 and Table A.12, using the limitations defined in Table A.1 and Table A.7.
The Class B requirements for equipment are intended to offer adequate protection to broadcast services within the residential environment.
Equipment intended primarily for use in a residential environment shall meet the Class B limits. All other equipment shall comply with the Class A limits.
Broadcast receiver equipment is class B equipment.
NOTE Equipment meeting Class A requirements may not offer adequate protection to broadcast services within a residential environment.
如下，我们把EN 55032的标准的辐射限值，从30MHz ~ 1000MHz 与 1000MHz ~ 6000MHz，都分别列出来了，这样大家就可以很容易看出来它们的规律。其中，低频30MHz ~ 1GHz CLASS A级与CLASS B级的差异为10dB、高频1GHz ~ 6GHz CLASS A级与CLASS B级的差异为6dB
Table A.2 – Requirements for radiated emissions at frequencies up to 1 GHz for Class A equipment
Table A.4 – Requirements for radiated emissions at frequencies up to 1 GHz for Class B equipment
Table A.3 – Requirements for radiated emissions at frequencies above 1 GHz for Class A equipment
Table A.5 – Requirements for radiated emissions at frequencies above 1 GHz for Class B equipment
关于EMC辐射测试中Antenna与EUT的测试距离换算，不同地区的标准或者不同产品经常会遇到关于天线与产品的测试距离30m、10m、3m，但是相关的标准中给出的往往是不同的测试距离限值，或者没有相应的30m法电波暗室、10米法电波暗室！那么我们就需要将限值转换了。
关于辐射测试中Antenna与EUT的测试距离换算 - 限值换算 - 3m 10m 其它测试距离限值
更多关于EMC测试天线距离请参阅 ： https://www.emc.wiki/thread-2305-1-1.html
CE EMC认证中，无论CLASS A还是CLASS B，标准给出了3m法辐射限值、也给出了10m法辐射限值，也就是说满足其中一种即可。
关于辐射测试中Antenna与EUT的测试距离换算 - 限值换算 - 3m 10m 其它测试距离限值
更多关于emc测试天线距离请参阅 ： https://www.emc.wiki/thread-2305-1-1.html EMC辐射测试的CLASS A与CLASS B限值差异
https://www.emc.wiki/thread-4838-1-1.html 感谢分享！！！！！:lol
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