Kev xaiv ntau yam rau Multimeters thiab tsom xam qhov ntsuas qhov yuam kev
Tej zaum yuav muaj qee qhov yuam kev thaum siv multimeter rau kev ntsuas. Qee qhov yuam kev no yog qhov yuam kev siab tshaj plaws uas tso cai los ntawm qib raug ntawm qhov ntsuas nws tus kheej. Qee qhov yog tib neeg yuam kev los ntawm kev hloov kho thiab siv tsis raug. Los ntawm kev nkag siab zoo txog cov yam ntxwv ntawm multimeter thiab cov laj thawj ntawm kev ntsuas qhov yuam kev, kev paub txog cov txheej txheem ntsuas thiab cov txheej txheem kom raug, ntsuas qhov yuam kev tuaj yeem raug txo.
Tib neeg kev nyeem ntawv yuam kev yog ib qho laj thawj uas cuam tshuam rau kev ntsuas qhov tseeb. Nws yog inevitable, tab sis nws tuaj yeem txo qis kom ntau li ntau tau. Yog li ntawd, tshwj xeeb yuav tsum tau them rau cov ntsiab lus hauv qab no thaum siv: 1. Ua ntej ntsuas, lub multimeter yuav tsum muab tso rau kab rov tav thiab mechanically zeroed; Thaum nyeem ntawv, khaws koj ob lub qhov muag perpendicular rau tus pointer; Thaum ntsuas kev tiv thaiv, xoom hloov yuav tsum tau ua txhua zaus lub iav hloov. Hloov lub roj teeb nrog ib qho tshiab yog tias nws tsis tuaj yeem hloov mus rau xoom; Thaum ntsuas qhov tsis kam lossis siab voltage, tsis txhob tuav cov hlau ib feem ntawm lub ntsuas ntsuas nrog koj txhais tes kom tsis txhob muaj kev hloov pauv ntawm tib neeg, nce kev ntsuas qhov yuam kev, lossis hluav taws xob poob siab; Thaum ntsuas qhov kev tawm tsam hauv RC Circuit Court, txiav tawm lub zog hluav taws xob hauv Circuit Court thiab tso cov hluav taws xob khaws cia hauv lub capacitor ua ntej pib ntsuas. Tom qab tsis suav nrog tib neeg kev nyeem ntawv yuam kev, peb tau ua qee qhov kev tshuaj xyuas ntawm lwm qhov yuam kev.
1. Kev xaiv thiab ntsuas qhov yuam kev ntawm qhov voltage thiab tam sim no ntau yam rau ib lub multimeter
Qhov tseeb theem ntawm multimeter feem ntau muab faib ua ntau theem, xws li {{0}}.1, 0.5, 1.5, 2.5, thiab 5. Kev ntsuas qhov tseeb ntawm qib rau ntau lub zog xws li DC voltage, tam sim no , AC voltage, tam sim no, thiab lwm yam yog sawv cev los ntawm qhov siab tshaj plaws tso cai yuam kev △ X thiab qhov feem pua ntawm cov kev xaiv ntau yam nqi tag nrho. Qhia tawm los ntawm cov mis: A%=(△ X/tus nqi tag nrho) x 100%... 1
(1) Qhov yuam kev tshwm sim los ntawm kev ntsuas tib qhov hluav taws xob siv lub tshuab multimeter nrog qhov tseeb sib txawv
(2) Qhov yuam kev tshwm sim los ntawm kev ntsuas tib qhov hluav taws xob nrog ntau qhov sib txawv ntawm multimeter
(3) Qhov yuam kev tshwm sim los ntawm kev ntsuas ob qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm ib qho multimeter
2. Kev xaiv ntau yam thiab ntsuas qhov yuam kev ntawm cov iav tiv thaiv
Txhua qhov ntawm cov iav tiv thaiv tuaj yeem ntsuas qhov ntsuas qhov ntsuas ntawm 0 mus rau ∞. Qhov ntsuas ntawm ohmmeter yog qhov ntsuas tsis sib xws thiab tsis sib npaug. Nws yog qhia raws li ib feem pua ntawm cov arc ntev ntawm tus pas ntsuas. Thiab qhov kev tiv thaiv sab hauv ntawm txhua qhov sib npaug yog sib npaug rau qhov chaw nruab nrab ntawm qhov ntsuas qhov ntev ntawm qhov sib npaug ntawm qhov sib npaug, hu ua "center resistance". Qhov ntawd yog hais tias, thaum ntsuas qhov kev tiv thaiv yog sib npaug rau qhov chaw tiv thaiv ntawm cov iav xaiv, qhov tam sim no ntws los ntawm Circuit Court yog ib nrab ntawm tag nrho cov ntsuas tam sim no. Tus pointer qhia ntawm qhov nruab nrab ntawm qhov ntsuas. Nws qhov tseeb yog qhia raws li hauv qab no:
R%=(△ R/center resistance) x 100%... 2
(1) Qhov yuam kev tshwm sim los ntawm kev xaiv ntau yam sib txawv thaum ntsuas tib qhov kev tiv thaiv nrog multimeter
