140CRA93101
140CRA93101
因?yàn)樵诒豢噩F(xiàn)場往往有很多信號同時(shí)接入計(jì)算機(jī)，而且這些信號線或者走電纜槽，或者走電纜管,但肯定是很多根信號在一起走線。這些信號之間均有分布電容存在，會通過這些分布電容將干擾加到別的信號線上，同時(shí)，在交變信號線的周圍會產(chǎn)生個(gè)交變的磁通，而這些交變磁通會在并行的導(dǎo)體之間產(chǎn)生電動勢，這也會造成線路上的干擾。
（3）計(jì)算機(jī)供電線路上引入的干擾
在有些工業(yè)現(xiàn)場(特別是電廠冶金企業(yè)、大的機(jī)械加工廠）大型電氣設(shè)備啟動頻繁，大的開關(guān)裝置動作也較頻繁，這些電動機(jī)的啟動、開關(guān)的閉合產(chǎn)生的火花會在其周圍產(chǎn)生很大的交變磁場．這些交變磁場既可以通過在信號線上耦合產(chǎn)生干擾，也可能通過電源線上產(chǎn)生高頻干擾，這些干擾如果超過容許范圍，也會影響計(jì)算機(jī)系統(tǒng)的工作。
（4）雷擊引入的干擾
雷擊可能在系統(tǒng)周圍產(chǎn)生很大的電磁干擾，也可能通過各種接地線引入干擾。
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