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
發生器將周(zhou)期性(xing)(xing)的(de)(de)單極(ji)性(xing)(xing)電(dian)壓(ya)脈沖饋入要識別(bie)的(de)(de)電(dian)纜中,該電(dian)纜需要在遠端接地(di),以保證有足夠大的(de)(de)電(dian)流(liu)流(liu)過(guo)電(dian)纜。該系(xi)統要設計(ji)成返回(hui)電(dian)流(liu)不(bu)要從同一(yi)電(dian)纜中返回(hui),能做到(dao)這一(yi)點,饋入電(dian)纜中的(de)(de)脈沖電(dian)流(liu)的(de)(de)方向可做為(wei)一(yi)明(ming)顯的(de)(de)識別(bie)標準,流(liu)出去(qu)的(de)(de)電(dian)流(liu)僅(jin)從這一(yi)根電(dian)纜通過(guo),所有其它鄰近電(dian)纜中流(liu)過(guo)的(de)(de)都是返回(hui)電(dian)流(liu),但(dan)它們的(de)(de)極(ji)性(xing)(xing)相反。
除了電(dian)(dian)(dian)流(liu)(liu)方向這(zhe)一實(shi)際差異外(wai),電(dian)(dian)(dian)流(liu)(liu)幅度也是一識(shi)別(bie)特征(zheng),流(liu)(liu)出(chu)去的電(dian)(dian)(dian)流(liu)(liu)僅通(tong)過一根電(dian)(dian)(dian)纜(lan)、而返回電(dian)(dian)(dian)流(liu)(liu)可(ke)通(tong)過幾根電(dian)(dian)(dian)纜(lan)、這(zhe)意味著流(liu)(liu)出(chu)去的電(dian)(dian)(dian)流(liu)(liu)比(bi)流(liu)(liu)過其它電(dian)(dian)(dian)纜(lan)的返回電(dian)(dian)(dian)流(liu)(liu)大(da)。便攜式電(dian)(dian)(dian)纜(lan)識(shi)別(bie)儀
接收機的(de)(de)任務是探(tan)測流(liu)過電(dian)(dian)(dian)纜(lan)(lan)電(dian)(dian)(dian)流(liu)方(fang)向(xiang)以及(ji)它的(de)(de)大小。為達(da)到這一(yi)(yi)目的(de)(de),電(dian)(dian)(dian)流(liu)傳感(gan)器(qi)(qi)被(bei)(bei)用作傳感(gan)器(qi)(qi),它帶有一(yi)(yi)放大器(qi)(qi)并串聯在(zai)電(dian)(dian)(dian)路中(zhong),傳感(gan)器(qi)(qi)鉗住被(bei)(bei)測電(dian)(dian)(dian)纜(lan)(lan),電(dian)(dian)(dian)流(liu)流(liu)過電(dian)(dian)(dian)纜(lan)(lan)產生的(de)(de)磁場在(zai)傳感(gan)器(qi)(qi)的(de)(de)線(xian)圈中(zhong)感(gan)應出電(dian)(dian)(dian)壓,該電(dian)(dian)(dian)壓極性由(you)電(dian)(dian)(dian)流(liu)方(fang)向(xiang)和傳感(gan)器(qi)(qi)線(xian)圈的(de)(de)方(fang)向(xiang)決定。為了得(de)到明(ming)顯(xian)有電(dian)(dian)(dian)流(liu)方(fang)向(xiang)的(de)(de)電(dian)(dian)(dian)壓極性,對一(yi)(yi)束電(dian)(dian)(dian)纜(lan)(lan)中(zhong)所有電(dian)(dian)(dian)纜(lan)(lan)進(jin)行測試都采取相同正確的(de)(de)方(fang)向(xiang)。
傳(chuan)感(gan)器線圈中感(gan)應的電(dian)壓在表頭(tou)中顯示出來,如果傳(chuan)感(gan)器按上述方(fang)式連接,指針擺動方(fang)向(xiang)可顯示電(dian)流方(fang)向(xiang),即只有電(dian)流流出的這(zhe)根(gen)電(dian)纜(lan)指針向(xiang)一(yi)邊(bian)偏,這(zhe)根(gen)就是(shi)要找(zhao)的電(dian)纜(lan)。