Siv lub multimeter los txiav txim qhov rwb thaiv tsev ntawm cov xov hlau lossis cov khoom siv hluav taws xob
Lub npe hu ua xaim xaim tiag tiag txhais tau hais tias qhov rwb thaiv tsev 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 laj thawj, thiab cov xaim hluav taws xob thiab lub ntiaj teb tsim kev tiv thaiv nrog tus nqi qis heev. 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 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 lub cev them nrog ntau theem voltage. Lub luag haujlwm ntawm rwb thaiv tsev; txhawm rau xyuas kom muaj kev nyab xeeb ntawm cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob, thiab tiv thaiv tus kheej ntawm hluav taws xob poob siab.
Lub ntsiab txhais ntawm rwb thaiv tsev kuj yog; tus nqi tsis kam ntawm cov txheej insulating ntawm cov khoom siv hluav taws xob nyob rau hauv qhov kev txiav txim ntawm DC voltage. Tsis muaj ib yam "insulating" kiag li nyob rau hauv lub ntiaj teb no. Yog hais tias ib tug DC voltage yog siv nyob rau hauv lub insulating khoom, qhov nruab nrab yuav ib txwm muaj ib tug tam sim no ntws los ntawm nws, tab sis qhov voltage yog siab los yog tsawg. 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, qhov xau hauv av tam sim no ntawm cov xaim muaj feem xyuam rau cov dej noo thiab kev laus ntawm cov khoom siv insulating. Qhov loj ntawm cov xau tam sim no muaj feem xyuam rau qhov siv hluav taws xob, qhov siab dua qhov hluav taws xob, 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 pointer multimeter, lawv yog cov cuab yeej ntsuas ntsuas feem ntau siv los ntawm cov kws hluav taws xob. Hais lus nruj me ntsis, lub multimeter tsis tuaj yeem ntsuas tus nqi xaim ntawm cov xaim. Qhov tseeb, cov tswv yim multimeter tuaj yeem txiav txim siab ua ntej seb 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 yog sib npaug rau tus cwj mem xeem.
Rau cov xaim hluav taws xob los yog cov khoom siv hluav taws xob, lub megohmmeter yuav tsum tau siv los ntsuas. Feem ntau siv megohmmeters yog 250v, 500v, thiab 1000v. Ntev npaum li lub megohmmeter yog shaken ntawm qhov ceev ntawm 120 revolutions ib feeb, thiab nws cov rwb thaiv tsev tiv thaiv yog ntau tshaj> 0.5MΩ, nws yog xam tias cov rwb thaiv tsev tsis kam yog qhov tsim nyog thiab siv tau nrog kev ntseeg siab.
Tsis txhob xav tias ib tug multimeter yog omnipotent. Feem ntau, cov roj teeb uas siv nyob rau hauv multimeter yog laminated roj teeb ntawm 1.5v thiab 9v. 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.
Yog tias tsis muaj kev tso cai, qhov kev ua haujlwm siab ntawm multimeter tuaj yeem siv los txiav txim qhov kev tiv thaiv kev tiv thaiv ntawm cov hlau lossis cov khoom siv hluav taws xob. Txoj kev no tsis yooj yim rau kev pom zoo. Kev siv lub tshuab multimeter los ntsuas cov kab hauv av lossis ntsuas qhov av tiv thaiv kuj yog qhov ntsuas kev txiav txim ua ntej. Qhov tseeb ntsuas ntawm qhov av tiv thaiv yog nqa tawm siv ib leeg- npab lossis ob txhais caj npab choj.
