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屏蔽電纜適用于需要屏蔽作用的場所

來源:www.vanjashop.com         發布時間:2020-06-12 返回列表
屏蔽電纜適用于需要屏蔽作用的場所

控制電纜是指普通傳輸信號和控制線路的電纜,在沒有特殊要求的情況下,沒有屏蔽功能。屏蔽電纜是指可以屏蔽磁干擾等起保護和傳輸作用的電纜,一般用字母“P”表示。兩者的區別:屏蔽電纜可以代替控制電纜,但控制電纜不可以代替屏蔽電纜,屏蔽電纜適用于需要屏蔽作用的場所。

屏蔽電纜

查鋁箔的質量

同軸電纜中起重要屏蔽作用的是鋁箔,它在回避外來開路信號干擾與有線電視信號混淆方面具有重要作用,因此對新進同軸電旨應檢查鋁箔的質量。首先,剖開護套層,觀察編織網線和鋁箔層表面是否保持良好光澤;其次是取一段電纜,緊緊繞在金屬小軸上,拉直向反向轉繞,重復幾次,再割開電纜護套層觀看鋁箔有無折裂形象,也可剖出一小段鋁箔在手中重復揉搓和拉伸,經多次揉搓和拉伸仍未斷裂,具有必須韌性的為合格品,否則為次品。


查外護層的擠包緊度

高質量的同軸電纜外護層都包得很緊,這樣可縮小屏蔽層內間隙,回避空氣進入造成氧化,回避屏蔽層的相對滑動引起電性能飄移,但擠包太緊會造成剝頭不便,增大施工難度。檢查方法是取1m長的電纜,在端部肅去護層,以用力不能拉出線芯為合適。


查電纜成圈形狀
電纜成圈不僅是個美觀問題,而且也是質量問題。電纜成圈平整,各條電纜保持在同一同心平面上,電纜與電纜之間成圓弧平行地整體接觸,可減輕電纜相互受力,堆放不易變形損破,因此在驗收電纜質量時對此不可能輕心。

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