CRT显示器电磁敏感性初探

Preliminary Investigation on the EMS of CRT Display

采用大电流注入(BCI)的试验方法对计算机用CRT显示器的电磁敏感性(EMS)进行研究。试验中,将某一频率下不同幅度的连续波信号作为电磁干扰信号注入到VGA接口的RGB、水平同步(HS)、垂直同步(VS)信号线中。当HS信号线中注入干扰信号时,CRT出现斜条纹这一电磁敏感现象,电磁干扰信号越强,斜条纹越明显,而RGB、VS信号线注入时,则没有出现上述现象。此外,还研究了注入信号与HS信号线耦合信号的关系。

Electromagnetic susceptibility(EMS) of cathode ray tube(CRT) for computer was investigated preliminarily using the test method of bulk current injection(BCI).During the test,CW signals as electromagnetic interference(EMI) signals with different amplitude at a certain frequency were injected into the RGB,horizontal synchronization(HS) and vertical synchronization(VS) signal line of video graphics array(VGA) interface.Sideling stripes came into view on the CRT display when the HS signal line was injected into EMI signals.Moreover,the stronger the EMI signals,the more obvious the sideling stripes.The dependent relations between the injected signals and the coupling ones on the HS signal line were also presented.