刚参加工作,刚看标准,有些疑惑
CISPR 14-1(2009)
The appliance shall be placed 0.4 m above an earthed conducting surface of at least 2 m *2 m in size and at a distance of 0,8 m from the artificial mains V-network and shall be kept at least 0,8 m from any other earthed conducting surface. If the measurements are made in a screened enclosure, the distance of 0,4 m may be referred to one of the walls of the enclosure.
CISPR 14-1 的描述应该是指器具放在 接地导电平面 上方 0.4m ,即地面上方0.4m 而距其他接地导电平面0.8 m ,即距墙 0.8m;但一些图片以及实验室的布置,都是器具离地面0.8m,离屏蔽室墙面0.4m 。如何解释呢? 谢谢~
楼主,后面还有一句是:If the measurements are made in a screened enclosure, the distance of 0,4 m may be referred to one of the walls of the enclosure.
也就是说在屏蔽室内测试的话0.4可以是到屏蔽室接地平面的任意一个面,我是这样理解的。
额,这句话只是说在屏蔽室内,器具距离接地墙可以是0.4m~但器具离地面,CISPR14-1规定的还是0.4m,而非图中所示0.8m。~
CISPR 14-1(2009)
5.2.2.1 Appliances normally operated without an earth connection and not held in the hand
The appliance shall be placed 0.4 m above an earthed conducting surface of at least 2 m *2 m in size and at a distance of 0,8 m from the artificial mains V-network and shall be kept at least 0,8 m from any other earthed conducting surface. If the measurements are made in a screened enclosure, the distance of 0,4 m may be referred to one of the walls of the enclosure.