Yuav ua li cas siv ib tug multimeter los xyuas seb cov kab yog luv los yog grounded?
Yog tias koj xav xyuas seb puas muaj qhov luv luv hauv kab. Ua ntej tshaj plaws, cov kab yuav tsum raug kaw, thiab tom qab ntawd txhua qhov hloov pauv yuav tsum qhib, thiab qhov kev tawm tsam ntawm ob kab yuav tsum tau thaiv los ntawm ohm ntawm multimeter. Feem ntau, qhov siab dua qhov tsis kam, qhov zoo dua. Yog tias koj txiav txim siab seb txoj kab puas yog hauv av los yog tsis, koj tuaj yeem siv ohm block ntawm multimeter. Txhawm rau ntsuas qhov tsis kam ntawm txhua kab rau hauv av. Kuj qhov loj dua qhov zoo. Nws yuav tsum tau muab sau tseg tias nws tsis yog qhov tseeb uas siv multimeter los ntsuas seb puas muaj qhov luv luv thiab hauv av hauv kab. Nws yuav tsum tsis txhob yuav, yog hais tias lub grounding los yog luv luv Circuit Court kuj yog heev me me, nws muaj peev xwm ntes tau nrog ib tug multimeter, yog hais tias tus kuj yog me ntsis loj. Lub multimeter tsis tuaj yeem kuaj xyuas nws, nws nyob hauv 380V qis-voltage circuit. Kev ntsuas yuav tsum tau ua nrog 500V megger, nruab nrab ntawm kab lossis hauv av. Ob leeg yuav tsum siab tshaj 0.38 megohms. Txwv tsis pub nws yog unqualified.
Ua ntej ntawm tag nrho cov, koj yuav tsum cais cov nyob hlau thiab nruab nrab hlau.
Hauv av xaim: Tig lub multimeter mus rau AC voltage ntau, thiab qhov ntau yog siab dua 220V. Ntxig cov hlau kuaj liab rau hauv qhov hluav taws xob qhov hluav taws xob, tawm hauv qhov ntsuas dub ntawm cov hlau lead unplugged, tom qab ntawd ntxig cov hlau kuaj liab rau hauv ib qho ntawm cov jacks ntawm lub qhov (socket), thiab saib xyuas kev nyeem ntawv.
Qhov kev nyeem ntawv loj tshaj plaws yog cov xov hlau nyob, ib qho uas nyeem me me yog xoom xaim, thiab qhov uas tsis muaj kev nyeem ntawv yog hauv av.
Yog tias ob qhov kev nyeem ntawv me me thiab ib qho kev nyeem ntawv loj, nws txhais tau hais tias cov xaim hauv av tsis yog hauv av, thiab cov xaim hauv av tseem txuas nrog cov xaim nruab nrab. Cov kauj ruam thib ob tom qab tsis tas yuav ntsuas.
Tig lub multimeter mus rau "luv luv Circuit Court" kev ua haujlwm (yog tias tsis muaj qhov ntsuas kev tiv thaiv), txuas cov kev xeem liab thiab dub coj mus rau hauv av ntawm Circuit Court thiab hauv av ntawm lub mains feem. Yog tias qhov ntsuas tau yog luv luv lossis qhov kev tiv thaiv me me, cov kab yog grounded, txwv tsis pub nws tsis yog.
Txheeb xyuas qhov xau thiab hauv av, thiab tig lub multimeter mus rau 200M. Piv txwv li, txhawm rau ntsuas qhov rwb thaiv tsev ntawm cov khoom siv, txuas ib kawg ntawm qhov kev sim ua rau cov khoom siv plhaub lossis cov xaim hauv av, thiab lwm qhov kawg ntawm qhov kev xeem ua rau kab. Thaum ntsuas rwb thaiv tsev, txhais tes yuav tsum tsis txhob kov qhov kev sim ua kom tsis txhob ntsuas qhov yuam kev.
Kho qhov tsis kam ntawm multimeter mus rau 20K lossis 200K, tua lub zog tseem ceeb thiab lub zog thauj khoom, siv lub multimeter los txuas ib qho kev xeem coj mus rau cov hlau nyob thiab ib qho kev sim ua rau hauv av xaim los xyuas cov nqi tiv thaiv, tom qab ntawd txuas ib qho kev xeem coj mus rau qhov nruab nrab xaim thiab ib qho kev sim ua rau hauv av xaim, thiab saib cov nqi tiv thaiv ob zaug. Yog tias muaj tus nqi tiv thaiv siab tshaj 7.3 lossis 14. saum toj no, nws txhais tau hais tias cov xaim nyob lossis cov xaim nruab nrab txuas nrog tus nqi tiv thaiv yog to.
Ntau tus kws tshaj lij hluav taws xob yuav qhia rau koj kom txiav tawm tag nrho lub zog thiab ntsuas qhov kev tawm tsam ntawm ob lub xov hlau nrog lub zog qis tshaj plaws (lossis diode iav) kom pom tias nws nyob ze rau {{0}} ohms (los yog lub diode. iav qhia 0).
Qhov tseem ceeb ntawm qhov voltage yog qhov txawv txav. Ntev npaum li qhov voltage ntawm ob kab yog 0, nws tuaj yeem ntsuas tau siv cov ntaub ntawv tiv thaiv:
1. Piv txwv tias koj xav ntsuas seb puas muaj qhov luv luv ntawm kab A thiab kab B. Tej zaum yuav muaj qhov hluav taws xob (piv txwv li, 220 volts) ntawm kab A thiab kab B mus rau kab nruab nrab. Qhov muaj peev xwm ntawm lawv cov kab muaj peev xwm A thiab muaj peev xwm B feem. Ntau tus neeg xav tias thawj zaug yog tias koj ncaj qha siv cov iav tiv thaiv los ntsuas, koj yuav tsum txiav tawm lub hwj chim ntawm kab A thiab kab B ua ntej ntsuas. Lub tswv yim no tsis yog lawm, tab sis conservative heev.
2. Txuas ncaj qha mus rau lub multimeter mus rau AC voltage ntau, xaiv qhov siab tshaj plaws, xws li AC1000 volts, thiab tom qab ntawd siv AC voltage ntau ntawm multimeter los ntsuas kab A thiab kab B. Yog tias muaj qhov hluav taws xob tseem ceeb ntawm ob. kab (xws li 200 volts), nws tuaj yeem ua pov thawj tias qhov muaj peev xwm A thiab qhov peev xwm B tsis sib npaug, uas yog hais tias, muaj qhov sib txawv ntawm qhov muaj peev xwm A thiab qhov muaj peev xwm B. Ob kab no tsis yog equipotential, thiab ob kab tsis luv ua ke.
3. Yog tias tsis muaj qhov hluav taws xob nruab nrab ntawm kab A thiab kab B siv AC voltage ntau, txhawm rau kom ntseeg tau tias tsis muaj DC voltage ntawm lawv, siv DC voltage ntau yam xws li 1000 volts kom paub meej tias tsis muaj DC voltage. Qhov no tuaj yeem ua pov thawj tias muaj peev xwm A thiab muaj peev xwm B sib npaug. Nco ntsoov tias kev sib npaug tsis tau txhais hais tias lawv tsis muaj qhov hluav taws xob ntawm cov kab nruab nrab N. Piv txwv li, kab A thiab kab B yog ob qho tib si 220 volts rau kab nruab nrab N, tab sis qhov voltage ntawm lawv kuj yog 0 volts. Nyob rau lub sijhawm no, koj tuaj yeem siv qhov tsawg tshaj plaws tsis kam los ntsuas qhov kev tawm tsam ntawm ob kab no. Ob lub xov hlau luv luv ua ke.
4. Raws li kev ntsuas seb nws puas yog av, koj tuaj yeem siv cov qauv saum toj no los ntsuas nws. Lub tswv yim yog kom nkag siab txog av xaim raws li cov hlau zoo tib yam. Tab sis feem ntau, koj tuaj yeem siv megger los ntsuas qhov kev tiv thaiv hluav taws xob (5 megohms rau kev rwb thaiv tsev dav dav) los ntsuas seb nws kov hauv av. Lub sijhawm no, koj yuav tsum tau txiav tawm lub zog los ntsuas.
