電纜識別儀工作原理及簡介
標簽: 電纜識別儀
電纜識別儀工作原理簡介
為了可靠準確地識別電纜,需要給被識別電纜加一特殊的信號,該信號要被專用接收機接收,利用這一特性便能識別出要找的電纜。便攜式電纜識別儀
電纜識別儀工作原理簡介
發生(sheng)器(qi)將周(zhou)期(qi)性的(de)(de)(de)單極性電(dian)(dian)(dian)壓脈沖饋(kui)入(ru)要(yao)識別(bie)的(de)(de)(de)電(dian)(dian)(dian)纜中,該電(dian)(dian)(dian)纜需要(yao)在遠端接(jie)地(di),以保證有(you)(you)足夠大的(de)(de)(de)電(dian)(dian)(dian)流(liu)流(liu)過電(dian)(dian)(dian)纜。該系統要(yao)設計成返回電(dian)(dian)(dian)流(liu)不(bu)要(yao)從同一(yi)(yi)電(dian)(dian)(dian)纜中返回,能(neng)做到這(zhe)(zhe)一(yi)(yi)點,饋(kui)入(ru)電(dian)(dian)(dian)纜中的(de)(de)(de)脈沖電(dian)(dian)(dian)流(liu)的(de)(de)(de)方向(xiang)可做為一(yi)(yi)明顯的(de)(de)(de)識別(bie)標(biao)準,流(liu)出去的(de)(de)(de)電(dian)(dian)(dian)流(liu)僅從這(zhe)(zhe)一(yi)(yi)根電(dian)(dian)(dian)纜通過,所有(you)(you)其它鄰近電(dian)(dian)(dian)纜中流(liu)過的(de)(de)(de)都是返回電(dian)(dian)(dian)流(liu),但它們(men)的(de)(de)(de)極性相反。
除(chu)了電(dian)(dian)流(liu)方向這一(yi)實際差異外,電(dian)(dian)流(liu)幅度也是一(yi)識別(bie)特征(zheng),流(liu)出(chu)去的電(dian)(dian)流(liu)僅通(tong)過一(yi)根電(dian)(dian)纜(lan)、而返回電(dian)(dian)流(liu)可(ke)通(tong)過幾根電(dian)(dian)纜(lan)、這意味著流(liu)出(chu)去的電(dian)(dian)流(liu)比流(liu)過其(qi)它電(dian)(dian)纜(lan)的返回電(dian)(dian)流(liu)大。便攜式電(dian)(dian)纜(lan)識別(bie)儀
接收機(ji)的任務是探(tan)測(ce)流過電(dian)(dian)纜(lan)(lan)電(dian)(dian)流方向(xiang)以(yi)及它(ta)的大(da)小。為達到(dao)(dao)這一目的,電(dian)(dian)流傳感(gan)(gan)(gan)器(qi)被用作(zuo)傳感(gan)(gan)(gan)器(qi),它(ta)帶(dai)有一放大(da)器(qi)并串聯在電(dian)(dian)路中(zhong),傳感(gan)(gan)(gan)器(qi)鉗住被測(ce)電(dian)(dian)纜(lan)(lan),電(dian)(dian)流流過電(dian)(dian)纜(lan)(lan)產(chan)生的磁場在傳感(gan)(gan)(gan)器(qi)的線圈中(zhong)感(gan)(gan)(gan)應出電(dian)(dian)壓(ya),該(gai)電(dian)(dian)壓(ya)極(ji)性由電(dian)(dian)流方向(xiang)和傳感(gan)(gan)(gan)器(qi)線圈的方向(xiang)決定。為了得到(dao)(dao)明顯有電(dian)(dian)流方向(xiang)的電(dian)(dian)壓(ya)極(ji)性,對一束(shu)電(dian)(dian)纜(lan)(lan)中(zhong)所有電(dian)(dian)纜(lan)(lan)進行測(ce)試都(dou)采(cai)取相同正確的方向(xiang)。
傳感(gan)器線圈中(zhong)感(gan)應的(de)電壓在(zai)表頭中(zhong)顯示出來,如果(guo)傳感(gan)器按上述方(fang)(fang)式連接,指(zhi)針(zhen)擺動方(fang)(fang)向可顯示電流(liu)(liu)方(fang)(fang)向,即只有電流(liu)(liu)流(liu)(liu)出的(de)這根電纜指(zhi)針(zhen)向一邊偏,這根就(jiu)是(shi)要找的(de)電纜。