Teknik Dasar Listrik Telekomunikasi

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TEKNIK DASAR LISTRIK TELEKOMUNIKASI Gambar 7.11: Bahan ferromagneik 7.5.1. Permeabilitas Permeabilitasatau ”daya hantar magnetik (ȝ)” adalah kemampuan bahanmedia untuk dilalui fluk magnet. Ada tiga golongan media magnet yaituferromagnet, paramagnetdandiamagnet. Ferromagnetmudahdijadikanmagnetdanmenghasilkanmedanmagnetyan gkuat,memilikidayahantarmagnetikyangbaik.Contohnya:besi,baja,nikel,co bal sertacampuranbeberapalogamsepertiAlnicodanpermalloy. Paramagnet kurangbaikuntukdijadikan magnet,hasilnya lemahdan permeabilitasnyakurangbaik. Contohnya:aluminium,platina, mangan, chromium. Diamagnet bahan yang lemah sebagai magnetdanberlawanan,permeabilitasnya dibawahparamagnet. Contohnya:bismuth, antimonium, tembaga, seng, emas dan perak. 14
TEKNIK DASAR LISTRIK TELEKOMUNIKASI Gambar 7.12:KurvaBH inti udara KurvaBH mengandunginformasiyang berhubungan denganpermeabilitassuatu bahan. Satuan permeabilitas Wb/Am. Permeabilitas hampa udara diperolehdariperbandinganantarakerapatanflukdankuatmedanmagnet gambar-7.12. Persamaanpermeabilitashampaudara: µ 0 Permeabilitashampaudara B H Flukmagnet Kerapatanmagnet Gambar 7.13: KurvaBH ferromagnetik Permeabilitasuntuk bahan magnet sifatnyatidakkonstan,selalu diperbandingkanterhadappermeabilitashampaudara,dimanaperbandinga ntersebut disebutpermeabilitasrelatif gambar-7.14. Persamaanpermeabiltasbahanmagnet: 15
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Teknik Dasar Listrik Telekomunikasi

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