通信设备中接地问题的研究与分析

接地是提高电子通信设备电磁兼容性的有效的重要手段之一。正确的接地既能抑制外部电磁干扰的影响,又能防止电子通信设备向外部发射电磁波;而错误的接地常常会引入非常严重的干扰,甚至会使电子通信设备无法正常工作。理想的"地"必须是一个零电位、零阻抗的理想导体,其上备点之间不应存在电位差,它可以在系统中作为所有电平的参考点,接地的目的有两个:一是为了安全,称为保护接地;二是为信号电压或系统电压提供一个稳定的零电位参考点,称为信号地或系统地。

Research and Analysis on the Communications Equipment Grounding

Grounding is the important and effective means to improve electronic communications equipment electromagnetic compatibility.Proper grounding can inhibit the effect of external electromagnetic interference and prevent external transmit electromagnetic waves of electronic communications equipment;While wrong grounding will often brings very serious interference,or even make the electronic communications devices do not work.Ideal grounding must be an ideal conductor with zero-potential,zero-impedance,and there should not have potential difference.And it can be considered as a reference point for all levels in the system.There are two main purposes of grounding,the one is safety which is called protective earth;the other one is to provide a stable zero potential reference point for the signal voltage or voltage of the system,which is called a signal or system grounding.