HIMA F3331

·變壓器的屏蔽層要很好地接地；
·變壓器的次級(jí)線圈一定要用雙絞線。
（2）屏蔽
屏蔽就是用金屬導(dǎo)體，把被屏蔽的元件，組合件，線，信號(hào)線包圍起來(lái)。這種方法對(duì)電容性耦合噪聲抑制效果很好。zui常見(jiàn)的就是用屏蔽雙絞線連接模擬信號(hào)。
以上說(shuō)的電氣屏蔽，但在很多場(chǎng)合下，信號(hào)除了受電噪聲干擾以外，主要還受到強(qiáng)交變磁場(chǎng)的影響，如電站，冶煉廠重型機(jī)械廠等，那么，我們除了要考慮電氣屏蔽以外，還要考慮磁屏蔽，即考慮用鐵、鎳等導(dǎo)磁性能好的導(dǎo)體進(jìn)行屏蔽。

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