Tus nyeem ntawv magnetic yog ib qho cuab yeej rau kev nyeem cov ntawv qhia txog hlau nplaum. Muaj ntau tus nyeem ntawv nyeem / nyeem ntawv, nyeem ntawv nyeem ntawv nyeem / nyeem ntawv, sib nqus daim ntawv brusher / nyeem ntawv, sib nqus daim card hlau
Daim npav qhov, daim ntawv nyeem sib nqus ntawv / ntaus ntawv, daim nqus hlau nug / ntaus ntawv, thiab lwm yam.
Hom sib txawv:
(1) Los ntawm lub cev muaj nuj nqi: a. Dav nplawm nyeem daim nplaum: lub cev tsis muaj lub keyboard; B. Keyboard nyeem ntawv: lub cev nrog lub keyboard, koj tuaj yeem nkag password.
(2) Los ntawm kev nyeem ntawv sib nqus daim npliag: ib leeg-khiav khoom sib nqus daim ntawv nyeem, ib leeg-khiav khoom sib nqus daim ntawv nyeem, ib leeg-khiav khoom sib nqus daim ntawv nyeem ntawv nyeem, ib leeg-khiav hlau nplaum nyeem ntawv; 1-2 nyeem cov ntawv nyeem dual-nplhaib, 2-3 daim ntawv nyeem ntau daim hlau nplais; tag nrho peb daim npav hlau nplaum nyeem ntawv.
(3) Los ntawm qhov chaw nres nkoj txuas nrog computers lossis terminals: keyboard ports, serial ports, USB (muaj cov duab cwj pwm kev coj cwj pwm thiab cov qauv cwj pwm txawv) thiab lwm yam.
Kev nyeem ntawv thiab sau ntawv ntawm cov phom sij sib nqus tau yog ua los ntawm lub sib nqus lub taub hau, uas muaj peb ntu: cov xim nqus hlau nplhaib, coil thiab sib nqus qhov sib txig sib luag. Mos hlau nplaum sib nqus yog tsim los ntawm cov khoom siv hlau nplaum nrog tsawg coercivity thiab siab permeability. Cov kev ua haujlwm ntawm qhov hluav taws xob yog hloov lub zog ntawm electromotive hauv lub coil mus rau hauv lub cev tsis sib haum los yog hloov cov flux nyob rau hauv lub coil mus rau hauv ib qho kev sib txawv ntawm electromotive force. Kev ua haujlwm ntawm qhov sib nqus qhov sib npaug ntawm qhov sib txawv yog tsim los ntawm kev sib nqus sib nqus.
Cov ntaub ntawv qhia txog cov khoom sib nqus ntawm daim npav yog qhov rov qab sau ntawv. Nws hloov cov teeb liab hlau ntawm cov hlau nplaum hluav taws xob hauv hluav taws xob, nws ua rau lub suab binary ntawm binary coding, thiab thaum kawg converts binary teeb liab rau hauv qhov teeb liab. Lub sijhawm ua haujlwm yog qhov sib txawv ntawm cov hlau nplaum yog nyob ze ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib nqus, thiab qhov sib nqus ntawm kev sib nqus los ntawm lub nqus taub hau ntawm ib qho kev ceev, yog li ntawd qhov sib txawv ntawm qhov sib txawv ntawm lub sib nqus lub taub hau. Raws li txoj cai ntawm electromagnetic induction, sib nqus taub hau coil generates induced peev xwm, uas yog, lub teeb liab sib nqus ntawm qhov sib nqus ntawm cov hluav taws xob hloov mus rau hauv hluav taws xob teeb liab, thiab qhov teeb meem ntawm qhov hluav taws xob yog generated ntawm ob hnub ntawm lub sib nqus taub hau coil, thiab cov ntaub ntawv ntawm cov hlau nplaum yog nyeem tawm ntawm binary seev suab.