弱電線纜質量好壞如何輕松辨別?
對面如此多的假冒線纜產品,在銷售弱電線(xian)纜的過程中,不管(guan)是(shi)線(xian)上(shang)還是(shi)線(xian)下,很(hen)多客戶都會問到辨別(bie)弱電線(xian)纜質量的問題,那么如何辨別(bie)呢(ni)?
1.護套:表面能看(kan)出(chu)壓緊里(li)面編(bian)網有規律的(de)“不(bu)平度”,說(shuo)明加工工藝好(hao),不(bu)會產生相對(dui)滑(hua)動(dong),是好(hao)電(dian)纜。外觀光滑(hua),看(kan)不(bu)出(chu)壓緊編(bian)網的(de)“不(bu)平度”,用手捏護(hu)套有松動(dong)感,是差(cha)電(dian)纜;
2.檢查屏蔽層編網:編數是否(fou)夠銅(tong)材編網,檢查可焊性,鍍(du)錫銅(tong)線刮(gua)看里面是不是銅(tong)線,鋁鎂(mei)合(he)金線的硬度(du)明顯大于銅(tong)線;編網稀疏,分布(bu)不均勻,與絕(jue)緣層(ceng)包裹不緊等是差電纜;
3.檢查芯線:syv電(dian)(dian)纜(lan)直(zhi)徑為(wei)0.78-0.8mm,sywv電(dian)(dian)纜(lan)為(wei)1.0mm;近來(lai)出現了一種syv75-5芯線直(zhi)徑是(shi)1.0mm的電(dian)(dian)纜(lan),這種電(dian)(dian)纜(lan)的特性阻抗,肯定不是(shi)75歐姆(mu),不應(ying)用(yong)到75歐姆(mu)傳輸系統中(zhong);
4.檢查芯線與絕緣層的沾合力:斜向切開絕緣層,按剝離方向拉開芯線,看芯線和絕緣層有沒有沾合工藝材料;好電纜有較大的沾合力,差電纜(lan)沒有沾合;
5.縱向抗拉實驗:取一米電(dian)(dian)(dian)(dian)纜(lan)(lan),分(fen)(fen)層剝開芯線(xian),絕緣層,屏蔽層,外(wai)戶(hu)套,各留10公分(fen)(fen)長。方法(fa)是:兩只手分(fen)(fen)別握電(dian)(dian)(dian)(dian)纜(lan)(lan)的相(xiang)鄰兩層,向相(xiang)反方向拉動;好(hao)電(dian)(dian)(dian)(dian)纜(lan)(lan)一般(ban)力(li)量拉不動,差電(dian)(dian)(dian)(dian)纜(lan)(lan)不費大力(li)就(jiu)可以輕(qing)松拉出來——電(dian)(dian)(dian)(dian)梯電(dian)(dian)(dian)(dian)纜(lan)(lan)這一條十分(fen)(fen)重要,不少所謂(wei)“電(dian)(dian)(dian)(dian)梯專用(yong)電(dian)(dian)(dian)(dian)纜(lan)(lan)”都存在這方面(mian)的問題。