Yuav ua li cas siv cov qib tsis kam ntawm multimeter los ntsuas seb lub Circuit Court yog grounded
Yuav ua li cas siv qhov kev teeb tsa tsis kam ntawm multimeter los ntsuas seb lub voj voog puas yog hauv av? Ua ntej, tsis hais cov kab lossis cov khoom siv twg raug ntsuas, qhov voltage yuav tsum tau ntsuas ua ntej kom ntseeg tau tias nws muaj kev nyab xeeb thiab tsis muaj hluav taws xob ua ntej ua lwm yam kev ntsuas. Yog hais tias nws yog ib tug capacitor los yog cov khoom siv nrog capacitive reactance, nws yuav tsum tau tso tawm ua ntej thiab txiav txim siab. Muaj kev nyab xeeb thiab tsis muaj hluav taws xob; tom qab ntawd kho lub multimeter mus rau 2000 megohm ntau yam, nrog rau ib qho kawg ntawm tus cwj mem ntsuas kov hauv av lossis lub plhaub hlau ntawm cov khoom siv, thiab lwm tus cwj mem kov tus cwj mem ib txwm siv ntawm khoom siv lossis kab. Yog tias qhov kev tiv thaiv tsawg dua 0.5 megohm, nws yog av. Feem ntau, cov khoom tiv thaiv xau loj dua 0.5 megohm thiab 30 mA yuav tsis tawm mus rau kev tiv thaiv, yog li nws feem ntau xav tias cov kab lossis cov khoom siv tsis yog hauv av. Tab sis nws kuj nyob ntawm kev khiav hauj lwm voltage los yog ntau yam kev cai ntawm cov khoom siv los yog kab.
Nyob rau hauv lub neej txhua hnub, muaj ntau ntau yam circuits. Kuv tsis paub qhov Circuit Court koj xa mus. Muaj cov hluav taws xob hluav taws xob, hluav taws xob hluav taws xob uas xa hluav taws xob, thiab lub cev muaj zog. Cia peb coj peb lub voj voog uas nquag siv no ua piv txwv. Siv ib lub multimeter los xyuas seb qhov hluav taws xob thaiv puas yog hauv av.
1. Cov khoom siv hluav taws xob. Feem ntau hais lus, universal electronic circuits raug xaiv rau kev ntsuas.
Lub iav ntawm lub 'meter' yog qhov siab tshaj plaws iav ntawm 10K. Nyob rau lub sijhawm no, qhov ntsuas ntsuas tus nqi yuav luag ze rau 10K. Lub pointer txav me ntsis, thiab tom qab ntawd cov kev xeem coj tau hloov pauv rau kev ntsuas. Qee cov khoom siv hluav taws xob yuav sib txawv tom qab qhov kev xeem coj tau hloov pauv, thiab yuav muaj qhov sib txawv me ntsis, vim tias hauv cov khoom siv hluav taws xob hauv hluav taws xob, txhawm rau tiv thaiv kev cuam tshuam ntau zaus, cov khoom siv hluav taws xob ntau zaus raug teeb tsa thiab hauv av, yog li nws yog ib txwm ua. muaj ib yam nqi rau av. Yog li ntawd, tib neeg feem ntau hnov loog ntawm lawv txhais tes. Hom Circuit Court no tsis tuaj yeem ntsuas nrog megger, vim nws yuav ua rau cov khoom siv hluav taws xob puas.
2. Voltage kis tau tus mob Circuit Court, coj cov teeb pom kev hauv tsev ua piv txwv. Ua ntej ntsuas, koj yuav tsum xub tua lub hwj chim hloov, thiab tseem tua cov keyboards ntawm txhua lub tshuab hluav taws xob, thiab tom qab ntawd ntsuas qhov xwm txheej hauv av. Yog hais tias koj siv ib tug multimeter rau hluav taws xob thaiv qhov ntsuas Circuit Court, qhov kev tiv thaiv rau hauv av thiab qhov tsis kam ntawm cov nyob thiab nruab nrab ntawm cov xov hlau yuav tsum yog infinite. Txawm hais tias lub multimeter yog siv los ntsuas qhov Circuit Court nrog 2 megohm thaiv, nws nyob deb ntawm txaus, vim hais tias qhov voltage ntawm lub laminated roj teeb nyob rau hauv lub multimeter tsuas yog 9 volts, thiab lub teeb pom kev zoo voltage yog nyob ib ncig ntawm 22 0 volts. . Yog tias ua tau, nws yog qhov zoo tshaj los siv ib qho 500-volt megohmmeter (hu ua megger). Qhov ntsuas tsis kam yuav tsum siab dua 0 lossis 5 megohms kom ntseeg tau tias lub voj voog tsis xau.
3. Thaum ntsuas lub cev muaj zog rau hauv av, nws tsis tuaj yeem siv multimeter los ntsuas nws. Nws kuj yuav tsum tau ntsuas nrog ib tug 500-volt megohmmeter. Qhov kev tiv thaiv ntawm lub kauj voj voog rau hauv av yuav tsum muaj ntau dua 05 megohms kom pom tias muaj kev nyab xeeb. Yog tias nws yog tshiab Cov kev ua haujlwm ntawm lub cev muaj zog rau hauv av yuav tsum siab dua 10 megohms. Yog li ntawd, txhua lub voj voog muaj cov kev xav tau sib txawv rau kev tiv thaiv hauv av. Cov uas muaj hluav taws xob siab yuav tsum muaj cov rwb thaiv tsev loj heev rau hauv av.
