External interference:It has nothing to do with the system structure and is determined by the usage conditions and the external environment.External interference mainly includes:sky electricity interference,such as interference radio waves caused by lightning or atmospheric ionization;celestial body interference,such as electromagnetic waves radiated by the sun or other planets;electromagnetic wave interference from surrounding electrical equipment;power frequency interference from power sources;caused by meteorological conditions Interference,such as humidity,temperature,etc.;geomagnetic field interference;electromagnetic waves generated by spark discharge,arc discharge,glow discharge,etc.
外部干扰：与系统结构无关，是由使用条件和外部环境决定的。外部干扰主要有：天电干扰，如雷电或大气电离作用引起的干扰电波；天体干扰，如太阳或其它星球辐射的电磁波；周围电气设备发出的电磁波干扰；电源的工频干扰；气象条件引起的干扰，如湿度、温度等；地磁场干扰；火花放电、弧光放电、辉光放电等产生的电磁波等。
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