Txhawm rau ntsuas qhov rwb thaiv tsev ntawm cov xov hlau lossis cov khoom siv hluav taws xob, siv lub multimeter.
Lub npe hu ua cov xaim xaim tiag tiag txhais tau hais tias qhov kev tiv thaiv hluav taws xob ntawm cov xaim hluav taws xob lossis cov khoom siv hluav taws xob tsis tuaj yeem ua tau raws li cov xwm txheej rau kev ua haujlwm ib txwm muaj vim muaj ntau yam laj thawj, ua rau cov kab hluav taws xob insulated thiab lub ntiaj teb los ua ib qho kev tiv thaiv me me. Rau qee qhov xwm txheej uas tus nqi hluav taws xob tiv thaiv yog sib npaug rau xoom, nws tsis yog qhov yooj yim to, tab sis sib npaug rau 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 siv cov khoom uas tsis yog-conductive los cais los yog qhwv lub cev them nws tus kheej los yog them lub cev nrog cov voltage sib txawv ntawm ib leeg. 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 kev sib tsoo ntawm tus kheej.
Lub ntsiab lus ntawm rwb thaiv tsev tsis kam yog qhov tsis kam ntawm cov txheej txheem 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 hauv ntiaj teb. Yog hais tias DC voltage yog siv rau ob qho kawg ntawm cov khoom siv insulating, yuav muaj ib txwm muaj tam sim no ntws los ntawm qhov nruab nrab, nws tsuas yog qib ntawm qhov voltage. Lub dielectric tam sim no tau muab faib ua cov xau tam sim no (kawg tam sim no, polarization capacitance tam sim no).
Txhawm rau muab nws yooj yim, cov xau thiab hauv av tam sim no ntawm cov xov hlau muaj feem xyuam rau cov dej noo thiab kev laus ntawm cov ntaub ntawv insulating, thiab lwm yam. Qhov loj ntawm cov xau tam sim no muaj feem xyuam rau cov ntaub ntawv siv hluav taws xob. Qhov siab dua qhov voltage, qhov ntau dua qhov xau tam sim no. Lub volt-ampere nkhaus ntawm lawv tsis yog linear.
Txawm hais tias nws yog digital multimeter lossis analog multimeter, lawv yog cov cuab yeej ntsuas ntsuas feem ntau siv 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, lub tswv yim multimeter tuaj yeem pib tsuas yog txiav txim siab seb cov khoom siv hluav taws xob hauv tsev lossis lub cev muaj zog puas tau siv thiab seb puas muaj cov xau hauv vaj tse. Lub sijhawm no, multimeter zoo li tus cwj mem xeem.
Yog tias muaj cov xaim hauv cov xaim xaim lossis cov khoom siv hluav taws xob, lub megohmmeter yuav tsum tau siv los ntsuas nws. Feem ntau siv megohmmeters suav nrog 250v, 500v, thiab 1000v. Tsuav qhov rwb thaiv tsev tiv thaiv ntau dua 0.5 MΩ thaum shaken nrog megger ntawm 120 rpm, qhov rwb thaiv tsev tiv thaiv yog suav tias yog qhov tsim nyog thiab cov cuab yeej siv tau nrog kev ntseeg siab.
Tsis txhob xav tias ib tug multimeter yog omnipotent. Cov roj teeb sab hauv ntawm cov khoom siv dav dav yog 1.5v thiab 9v laminated roj teeb. Nws tsis muaj txoj hauv kev los ntsuas qhov rwb thaiv tsev ntawm ib theem 220V lossis peb-theem 380V AC kab lossis khoom siv hluav taws xob.
Thaum cov xwm txheej tsis tso cai, qhov kev ua haujlwm siab ntawm multimeter tuaj yeem siv los txiav txim siab qhov rwb thaiv tsev ntawm cov xov hlau lossis cov khoom siv hluav taws xob. Txoj kev no tsis yooj yim pom zoo. Kev ntsuas cov kab hauv av lossis ntsuas qhov av tiv thaiv nrog lub multimeter kuj yog qhov kev txiav txim ua ntej ntsuas. Qhov tseeb ntsuas ntawm qhov av tiv thaiv yog ua los ntawm ib sab caj npab los yog ob sab caj npab.
