Kev ntsuas kev tiv thaiv hluav taws xob ntawm cov xaim lossis hluav taws xob nrog lub multimeter.
Lub npe hu ua xaim xaim qhia tau hais tias qhov kev tiv thaiv hluav taws xob ntawm cov xaim lossis cov khoom siv hluav taws xob tsis tuaj yeem ua tau raws li cov kev ua haujlwm ib txwm muaj vim muaj ntau yam, ua rau muaj tus nqi me me ntawm cov xaim insulated thiab hauv av. Rau qee qhov xwm txheej uas tus nqi hluav taws xob tiv thaiv yog sib npaug rau xoom, nws tsis yog tsuas yog xau, tab sis yog luv luv Circuit Court.
Ntawm no, kuv yuav nrov lub tswv yim ntawm rwb thaiv tsev tsis kam; Lub npe hu ua rwb thaiv tsev yog hais txog kev siv cov khoom uas tsis yog-conductive los cais lossis qhwv cov khoom them lawv tus kheej lossis cov khoom them nrog cov qib sib txawv. Kev ua haujlwm ntawm rwb thaiv tsev; Ua kom muaj kev nyab xeeb ntawm cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob, thiab tiv thaiv qhov tshwm sim ntawm kev sib tsoo hluav taws xob ntawm tus kheej.
Lub ntsiab txhais ntawm rwb thaiv tsev kuj yog; Tus nqi tsis kam ntawm txheej rwb thaiv tsev ntawm cov khoom siv hluav taws xob nyob rau hauv qhov kev txiav txim ntawm DC voltage. Tsis muaj cov khoom "insulating" kiag li nyob hauv lub ntiaj teb. Yog tias qhov hluav taws xob ncaj qha tam sim no raug siv rau ob qho kawg ntawm cov khoom siv insulating, yuav tsum muaj qhov tam sim no dhau los ntawm qhov nruab nrab, tsuas yog theem voltage. Lub dielectric tam sim no tau muab faib ua cov xau tam sim no (kawg tam sim no, polarization capacitance tam sim no).
Cias muab tso, cov xaim av tam sim no ntawm cov xaim muaj feem xyuam rau cov dej noo thiab kev laus ntawm cov khoom siv rwb thaiv tsev. Qhov loj ntawm cov xau tam sim no muaj feem xyuam rau qhov siv hluav taws xob, thiab qhov siab dua qhov hluav taws xob, qhov ntau dua qhov xau tam sim no. Lawv cov volt ampere nkhaus tsis muaj feem cuam tshuam.
Txawm hais tias nws yog digital multimeter lossis pointer hom multimeter, lawv feem ntau siv cov cuab yeej ntsuas ntsuas los ntawm cov kws hluav taws xob. Hais lus nruj me ntsis, multimeter tsis tuaj yeem ntsuas tus nqi xaim ntawm cov xaim. Qhov tseeb, kev siv lub tshuab hluav taws xob tsuas tuaj yeem txiav txim siab ua ntej seb puas muaj cov khoom siv hluav taws xob hauv tsev lossis lub cev muaj zog thiab seb puas muaj cov xau hauv lub casing. Lub sijhawm no, multimeter zoo li tus cwj mem xeem.
Rau qhov muaj cov xau hauv cov xaim hluav taws xob lossis cov khoom siv, lub megohmmeter yuav tsum tau siv rau kev ntsuas. Muaj ntau yam siv megohmmeters, suav nrog 250V, 500V, thiab 1000V. Ntev npaum li lub megohmmeter yog siv los co ntawm qhov ceev ntawm 120 revolutions ib feeb, thiab nws cov rwb thaiv tsev tiv thaiv yog ntau dua los yog sib npaug rau 0.5M Ω, nws yog suav tias yog qhov tsim nyog thiab siv tau nrog kev ntseeg siab.
Tsis txhob xav tias ib tug multimeter yog omnipotent. Ib tug raug multimeter siv stacked 1.5V thiab 9V roj teeb nyob rau hauv. Nws yog tsis yooj yim sua los ntsuas qhov rwb thaiv tsev tsis kam ntawm ib-theem 220V lossis peb-theem 380V AC fais fab kab lossis khoom siv hluav taws xob.
Nyob rau hauv cov xwm txheej uas tej yam kev mob tsis tso cai, lub siab tsis kam ntawm ib tug multimeter yuav siv tau los txiav txim siab qhov rwb thaiv tsev ntawm cov xov hlau los yog cov khoom siv hluav taws xob, tab sis txoj kev no tsis yooj yim pom zoo rau kev siv. Siv lub multimeter los ntsuas qhov av ntawm lub voj voog lossis ntsuas qhov kev tiv thaiv hauv av kuj yog qhov kev txiav txim siab ua ntej. Txhawm rau ntsuas qhov kev tiv thaiv hauv av tiag tiag, yuav tsum siv ib sab caj npab lossis ob sab caj npab.
