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电子仪器一般可概略地分为二类,一类作信号源用,一类作测量放大器用。当信号源和测量放大器共用工频50周/220伏市电作为电源,并且它们之间构成一个测量系统时,常常会因为莫明其妙的干扰引起测量误差,甚至无法工作。碰到这类问题时,占有放大器的一方责怪信号源有问题,而占有信号源的一方,则责怪放大器不过硬。那末,这究竟是谁的过错呢?很明显,这多数是共模干扰在作怪。有关共模干扰的问题,已有一些同志发表过文章,但有两个问题对不少的工程技术人员来说仍然是个难以理解的问题,即: 1、共模干扰究竟来自何处? 2、怎样的屏蔽才能有效地对抗共模干扰?
Electronic equipment generally can be roughly divided into two categories, one for signal source, one for measuring amplifiers. When the signal source and the measuring amplifier share the power frequency of 50 weeks / 220 volts mains as the power supply, and they form a measurement system, often due to inexplicable interference caused by measurement error, or even not work. Encountered such problems, the possession of the amplifier side of the source of blame the problem, and possession of the source side, then blame the amplifier but not too hard. So, who is the fault of it? Obviously, most of these are common mode interference at play. There are some comrades who have published articles about common-mode interference, but there are two problems that are still difficult to understand for many engineers and technicians, namely: 1. Where are common-mode interference coming from? What kind of shielding can effectively combat common mode interference?