Lub multimeter qhia dab tsi yog hais tias lub voj voog yog hauv av lossis yog tias nws luv?
Thaum muaj hluav taws xob hluav taws xob, siv lub tshuab multimeter nrog 10k iav los txiav lub nra thiab ntsuas lub voj voog. Thaum muaj peb theem thiab plaub ntawm cov xov hlau, qhov tseem ceeb ntawm cov plaub kab yuav tsum tau muab tso rau hauv infinite ntawm multimeter, thiab tus nqi ib txwm ntawm ib-theem kab yuav tsum tau muab tso tawm ua infinite. Thaum muaj tus nqi tiv thaiv, nws tuaj yeem txiav txim siab tias muaj qhov luv luv hauv kab. Txhawm rau txiav txim siab hauv av, siv lub multimeter los kov ib kawg ntawm ib lub xov hlau nrog ib qho kev sojntsuam, thiab ntsuas qhov kev hloov pauv nrog rau lwm qhov kev sojntsuam. Yog hais tias tus nqi kuj yog infinite, nws yog ib txwm. Txwv tsis pub, muaj qhov tshwm sim hauv av. Siv txoj kev no los ntsuas tag nrho cov xov hlau los ntawm ib qho los nrhiav qhov teeb meem. Tsis tas li ntawd, nco ntsoov tias yog tias nws yog steel sawb cable, tso rau lwm qhov kawg ntawm kev sojntsuam ntawm cov hlua hlau rau kev ntsuas. Txhawm rau kom ntseeg tau qhov tseeb ntawm qhov ntsuas, nws yog qhov zoo tshaj rau thawj zaug xyuas seb puas muaj qhov qhib qhov hluav taws xob hauv Circuit Court, thiab tom qab ntawd siv multimeter los xyuas qhov luv luv Circuit Court thiab hauv av txhaum. Qhov tseeb, txhawm rau daws qhov teeb meem ntawm ob hom kev ua txhaum no, cov cuab yeej xws li megohmmeters thiab cov cuab yeej ntes tau siv los ua kev saib xyuas sai thiab raug dua.
Siv cov khoom siv hluav taws xob hauv tsev ua piv txwv: Cov khoom siv hauv tsev teeb pom kev zoo yog cov xaim nyob, cov xaim nruab nrab, thiab cov xaim hauv av. Yog hais tias cov hlau nyob thiab cov hlau nruab nrab luv luv Circuit Court breaker yuav tawm mus. Lub sijhawm no, tag nrho cov khoom siv hluav taws xob yuav tsum raug muab tua, thiab ob lub xaim hluav taws xob xaus (cov xaim nyob thiab nruab nrab ntawm cov neeg siv xaim) yuav tsum tau muab tshem tawm ntawm lub Circuit Court breaker. Siv ib tug multimeter los ntsuas tus nqi kuj ntawm ob lub xov hlau nyob rau hauv nruab nrab hom, uas yuav tsum yog infinite. Yog tias tus nqi tsis kam yog xoom lossis tsuas yog ob peb ohms, nws txhais tau hais tias cov hlau nyob thiab cov xaim nruab nrab yog luv luv.
Tig lub Circuit Court breaker, tsis txhob nruab ob qhov kawg ntawm cov zis kab, tua tag nrho cov khoom siv hluav taws xob, thiab siv multimeter los ntsuas AC 250 qib: txuas ib qho kev sojntsuam mus rau qhov qhib Circuit Court breaker kawg thiab lwm qhov kev sojntsuam rau tus neeg siv. kab kawg. Yog tias muaj qhov hluav taws xob txog li 200 volts, nws ua pov thawj tias lub voj voog yog grounded.
Hauv Suav teb qhov hluav taws xob qis hluav taws xob, nws tau teev tseg tias qhov nruab nrab ntawm qhov nruab nrab yuav tsum yog hauv av, thiab cov xaim nruab nrab tsis tuaj yeem siv los ua cov xaim hauv av. Ib tug tshwj xeeb tiv thaiv hauv av hlau yuav tsum tau muab ntsia nyias. Tom qab nkag mus rau tus neeg siv lub thawv hluav taws xob, cov xov hlau nyob thiab nruab nrab yuav tsum tau insulated los ntawm hauv av thiaj li ua haujlwm zoo. Thaum qhov kev tiv thaiv ntawm cov hlau nyob lossis nruab nrab rau hauv av xaim tsawg dua 0.5M ohms, qhov kev tiv thaiv xau yuav tawm mus thiab txiav tawm lub zog hluav taws xob.
Tom qab ib qho kev mus txawv tebchaws tshwm sim, ib tug multimeter yuav siv tau los xyuas seb lub Circuit Court thiab load tom qab lub Circuit Court breaker yog luv luv circuited los yog grounded. Txoj kev yog raws li nram no:
Disconnect lub ntsiab fais fab hloov thiab disconnect lub nruab nrab ntawm lub hwj chim mov. (Qee lub Circuit Court breakers muaj ib tug nruab nrab hlau tsis tu ncua nyob rau hauv lub qhib txoj hauj lwm thiab yuav tsum tau muab tshem tawm), ces siv lub siab tshaj plaws kuj ntau yam ntawm ib tug multimeter (qhov ntau yuav tsum ntau dua 1M ohms) los ntsuas qhov tsis kam ntawm cov hlau nyob thiab nruab nrab xaim rau hauv av xaim nyias. Yog tias tus nqi tiv thaiv tsawg dua 0.5M ohms, nws raug txiav txim tias tsis tsim nyog.
Yog hais tias qhov kev tiv thaiv ntawm cov nyob thiab nruab nrab nyob rau hauv av hlau yog tsim nyog, nws qhia tau hais tias nws tsis yog ib tug txhaum hauv av. Tom qab ntawd tsuas yog ib qho multimeter tuaj yeem siv los ntsuas qhov ntsuas qhov tseem ceeb ntawm cov xov hlau nyob thiab nruab nrab (tag nrho cov plugs yuav tsum tau muab tshem tawm thiab tag nrho cov khoom siv hluav taws xob yuav tsum tau muab tua), uas yuav tsum muaj ntau dua 0.5M ohms. Yog tias tsis muaj teeb meem nrog lub voj voog, nws yuav muaj teeb meem ntau dua, thiab qhov teeb meem nyob ntawm cov khoom siv hluav taws xob. Xyuas lawv ib tug los ntawm ib tug!
