Yuav ua li cas siv multimeter los xyuas seb cov kab yog luv luv los yog hauv av?
Yog tias koj xav kuaj kab rau luv luv Circuit Court. Ua ntej tshaj plaws, cov kab yuav tsum raug txiav tawm, tom qab ntawd cov hloov pauv yuav tsum qhib, thiab qhov kev tawm tsam ntawm ob kab yuav tsum tau thaiv nrog ohm ntawm multimeter. Raws li ib txwm muaj, qhov ntau dua qhov kev tiv thaiv, qhov zoo dua. Yog tias koj txiav txim siab seb txoj kab yog grounded, koj tuaj yeem siv lub ohm block ntawm lub multimeter. Txhawm rau ntsuas qhov tsis kam ntawm txhua kab rau hauv av. Qhov loj dua qhov zoo. Nws yuav tsum tau muab sau tseg tias nws tsis yog qhov tseeb los ntsuas qhov luv luv Circuit Court thiab grounding ntawm kab nrog multimeter. Nws yuav tsum tsis txhob yuav, yog hais tias lub grounding los yog luv luv-circuit kuj yog heev me me, nws yuav tsum tau kuaj los ntawm multimeter, yog hais tias tus kuj yog me ntsis loj. Lub multimeter tsis tuaj yeem kuaj xyuas, thiab nws yog nyob rau hauv qhov hluav taws xob tsis tshua muaj hluav taws xob ntawm 380V V. 500V co lub rooj yuav tsum siv rau kev ntsuas, txawm hais tias ntawm kab lossis hauv av. Yuav tsum siab tshaj 0.38 megohm. Txwv tsis pub, nws yog unqualified.
Ua ntej ntawm tag nrho cov, nws yog ib qhov tsim nyog los cais cov kab hluav taws thiab xoom kab.
Hauv av xaim: teeb lub multimeter rau AC voltage ntau, thiab qhov ntau yog siab dua 220V V. Ntxig lub stylus liab rau hauv qhov hluav taws xob qhov hluav taws xob, tab sis tsis yog lub stylus dub, thiab tom qab ntawd ntxig lub stylus liab rau hauv ib qho ntawm cov sockets los soj ntsuam cov nyeem ntawv.
Qhov kev nyeem ntawv loj tshaj plaws yog cov xov hlau nyob, qhov kev nyeem me me yog cov kab xoom, thiab kev nyeem ntawv yog cov xaim 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 kuj tseem txuas nrog xoom kab. Tsis tas yuav ntsuas hauv qib thib ob.
Tig lub multimeter mus rau "luv luv Circuit Court" kev ua haujlwm (yog tias tsis muaj qhov ntsuas tsis muaj zog), thiab cov kev sojntsuam liab thiab dub txuas nrog rau hauv av ntawm Circuit Court thiab hauv av ntawm kev lag luam fais fab feem. Yog hais tias qhov kev ntsuam xyuas yog luv luv los yog qhov kev tiv thaiv me me, cov kab yog grounded, txwv tsis pub nws tsis yog.
Tshawb xyuas cov dej xau thiab hauv av, thiab ntaus lub multimeter mus rau 200M m. Piv txwv li, txhawm rau ntsuas qhov rwb thaiv tsev ntawm cov khoom siv, txuas ib kawg ntawm lub stylus mus rau cov khoom siv plhaub lossis cov xaim hauv av, thiab lwm qhov kawg ntawm lub stylus rau kab. Thaum ntsuas rwb thaiv tsev, tes yuav tsum tsis txhob kov lub stylus kom tiv thaiv kev ntsuas qhov yuam kev.
Kho qhov tsis kam ntawm multimeter mus rau 20K lossis 200K, tua lub zog tseem ceeb thiab thauj cov khoom siv hluav taws xob, txuas cov hlau nyob thiab hauv av xaim nrog multimeter, txheeb xyuas tus nqi tsis kam, tom qab ntawd txuas cov xoom xaim thiab cov xaim hauv av nrog ib qho sojntsuam, thiab saib tus nqi tiv thaiv ob zaug. Yog tias nws tshwm saum 7.3 lossis siab dua 14, nws txhais tau hais tias cov hlau nyob lossis xoom xaim nrog tus nqi tiv thaiv tau tawg.
Lub ntsiab ntawm qhov voltage yog qhov sib txawv. Ntev npaum li qhov voltage ntawm ob kab yog 0, koj tuaj yeem siv cov ntaub ntawv tiv thaiv los ntsuas:
1. Piv txwv tias muaj ib qho luv luv ntawm kab A thiab kab B, thiab tej zaum yuav muaj qhov hluav taws xob (piv txwv li, 220 volts) ntawm kab A thiab kab B mus rau kab nruab nrab, thiab qhov muaj peev xwm ntawm lawv cov kab muaj peev xwm A thiab muaj peev xwm. B raws. Thawj qhov uas ntau tus neeg xav txog yog tias yog tias koj ntsuas ncaj qha nrog cov ntaub ntawv tiv thaiv, koj yuav tsum txiav tawm lub hwj chim ntawm kab A thiab kab B feem ua ntej koj tuaj yeem ntsuas. Lub tswv yim no tsis yog lawm, tab sis conservative heev.
2, ncaj qha hu 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 muaj zog (xws li 200 volts) ntawm ob kab, nws tuaj yeem ua pov thawj tias muaj peev xwm A thiab muaj peev xwm B tsis sib npaug, uas yog hais tias, muaj qhov sib txawv ntawm qhov muaj peev xwm A thiab muaj peev xwm B. Ob kab no tsis sib npaug ntawm lub peev xwm, thiab lawv tsis luv ua ke.
3. Yog tias tsis muaj qhov hluav taws xob ntawm kab A thiab kab B ntsuas los ntawm cov ntaub ntawv AC voltage, rau qhov lav, xaiv cov ntaub ntawv DC voltage xws li 1000 volt cov ntaub ntawv los ntsuas ntawm lawv, thiab paub meej tias muaj tsis muaj DC voltage. Cov qauv no tuaj yeem ua pov thawj tias muaj peev xwm A thiab muaj peev xwm B sib npaug. Ua tib zoo saib xyuas qhov sib npaug tsis tau txhais hais tias lawv tsis muaj qhov voltage rau xoom kab N. Piv txwv li, kab A thiab kab B yog ob qho tib si 220 volts rau xoom kab N, tab sis qhov voltage ntawm lawv kuj yog 0 volts. Lub sijhawm no, cov ntaub ntawv tiv thaiv yam tsawg kawg nkaus tuaj yeem siv los ntsuas ntawm ob kab no.
4. Raws li seb qhov av yog ntsuas, cov txheej txheem saum toj no kuj siv tau yooj yim. Lub tswv yim yog kom nkag siab txog av xaim raws li ib txoj kab zoo tib yam. Txawm li cas los xij, feem ntau, txhawm rau ntsuas seb nws puas kov hauv av, koj tuaj yeem siv lub rooj sib tsoo los ntsuas qhov kev tiv thaiv hluav taws xob (feem ntau, qhov rwb thaiv tsev yog 5 megohms), thiab lub sijhawm no, nws yog ib qho tsim nyog yuav tsum txiav tawm lub hwj chim los ntsuas.
