Lub multimeter qhia tau dab tsi yog tias kab hauv av lossis luv luv?
Thaum lub hwj chim tawm, siv 10k ntau yam ntawm lub tshuab multimeter kom tshem tawm cov load thiab ntsuas kab. Nyob rau hauv cov ntaub ntawv ntawm peb-theem plaub-xaim, qhov kev tiv thaiv multimeter ntawm plaub kab yuav tsum qhia infinity, thiab ib-theem kab yuav tsum kuj qhia infinity thaum qhov kev tiv thaiv yog ib txwm. Yog tias 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 ib qho kev sim ntawm ib qho multimeter los kov ib qho kawg ntawm ib kab, thiab siv lwm qhov kev xeem coj los ntsuas seb puas muaj kev hloov pauv hauv qhov tsis kam. Yog hais tias nws yog infinite, nws yog ib txwm. Txwv tsis pub, muaj qhov tshwm sim hauv av. Siv txoj kev no los ntsuas tag nrho cov kab ib los ntawm ib qho los nrhiav qhov teeb meem. Tsis tas li ntawd nco ntsoov tias yog tias nws yog ib daim kab xev steel, muab qhov kawg ntawm qhov kev xeem ntawm cov hlau nplaum 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 hluav taws xob hauv kab, 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 no, koj tuaj yeem siv megohmmeters, cov cuab yeej ntes thiab lwm yam cuab yeej los ua kev saib xyuas sai thiab raug dua.
Siv cov khoom siv hluav taws xob hauv tsev ua piv txwv: Cov khoom siv hluav taws xob hauv tsev muaj cov xaim nyob, cov xaim nruab nrab, thiab cov xaim hauv av. Yog hais tias cov hlau nyob thiab cov hlau nruab nrab yog luv luv, lub Circuit Court breaker yuav tawm mus. Lub sijhawm no, tua tag nrho cov khoom siv hluav taws xob thiab tshem tawm ob lub tso zis tawm ntawm qhov hluav taws xob hluav taws xob (cov xaim nyob thiab nruab nrab ntawm cov neeg siv kab). Siv ib lub multimeter los ntsuas qhov tsis kam ntawm ob lub xov hlau. yog infinite. Yog tias qhov tsis kam yog xoom lossis tsuas yog ob peb ohms, cov xaim 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 ib lub multimeter los ntsuas qhov 250-ceev AC: ib qho kev xeem txhuas txuas nrog lub tshuab cua txias, thiab lwm qhov kev xeem txhuas txuas nrog rau cov neeg siv lead ua. Yog hais tias muaj ib tug voltage ntawm txog 200 volts, nws yog pov thawj Kab av.
Hauv kuv lub teb chaws 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, cov hlau nruab nrab tsis tuaj yeem siv los ua kab hauv zos, thiab cov xaim tshwj xeeb hauv av yuav tsum tau nruab. Cov hlau nyob thiab cov hlau nruab nrab tom qab nkag mus rau tus neeg siv lub thawv hluav taws xob yuav tsum tau khaws cia hauv lub ntiaj teb kom ua haujlwm zoo. Thaum qhov kev tiv thaiv ntawm cov hlau nyob lossis cov xaim nruab nrab mus 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, koj tuaj yeem siv multimeter los xyuas seb cov kab thiab thauj khoom tom qab lub Circuit Court breaker yog luv luv lossis hauv av. Cov txheej txheem raws li hauv qab no:
Tua lub hwj chim loj hloov thiab disconnect lub nruab nrab ntawm lub hwj chim mov. (Cov kab nruab nrab ntawm qee cov kab hluav taws xob tsis sib txuas hauv qhov qhib, thiab cov xaim nruab nrab yuav tsum tau muab tshem tawm.) Tom qab ntawd, siv qhov siab tshaj plaws tiv thaiv qhov chaw ntawm multimeter (qhov ntau yuav tsum siab dua 1M ohm) los ntsuas cov hlau nyob. thiab cov hlau nruab nrab rau hauv av feem. Resistor, yog tias tus nqi tiv thaiv qis dua 0.5M ohm, nws yuav raug txiav txim tias tsis tsim nyog.
Yog tias qhov kev tiv thaiv ntawm cov hlau nyob thiab nruab nrab ntawm cov xaim hauv av yog tsim nyog, nws txhais tau tias nws tsis yog qhov txhaum hauv av. Tom qab ntawd koj tsuas tuaj yeem siv multimeter los ntsuas qhov tsis kam 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 ntawm kev xaim, nws yuav muaj teeb meem ntau dua. Qhov teeb meem yog nrog cov khoom siv hluav taws xob. Xyuas lawv ib tug los ntawm ib tug!
Txawm hais tias nws yog ib qho luv luv Circuit Court los yog leakage, lub Circuit Court breaker yuav twv yuav raug hu mus. Yog hais tias lub Circuit Court breaker tsis mus los ntawm ib tug luv luv Circuit Court, qhov tshwm sim yuav muaj kev puas tsuaj, txwv tsis pub lub zes me me yuav raug puas tsuaj los ntawm hluav taws. Thaum ntsib qhov xwm txheej zoo li no hauv tsev, koj yuav tsum tsis txhob kaw qhov hloov dua tshiab, tab sis ua ntej xyuas qhov txhaum. Ua ntej, muab pov tseg tag nrho cov khoom sib txuas ntawm lub tshuab hluav taws xob tripped, thiab tom qab ntawd tshem tawm tag nrho cov xov hlau nruab nrab thiab nyob ntawm qhov hluav taws xob kawg ntawm lub Circuit Court breaker. Siv ib lub multimeter los ntsuas seb puas muaj txoj hauv kev ntawm lawv. Yog hais tias lub multimeter buzzes, luv luv Circuit Court yuav ua suab. Yog tias koj siv lub resistor rau luv-circuit, tus nqi kuj yuav qhia xoom ohms. Yog tias muaj qhov luv luv, nrhiav lub voj voog.
Nrhiav tag nrho cov pob qij txha thiab cov thawv sib txuas hauv kab tom qab lub tshuab hluav taws xob hluav taws xob no kom pom tias cov rwb thaiv tsev ntawm cov pob qij txha tsis zoo, thiab tom qab ntawd kos nrog ntau lub ntsuas ntawm txhua qhov sib koom ua ke thiab cov thawv sib txuas uas siv txoj kev ntsuas kev tiv thaiv. Yog vim li cas yog tias ib tug loj tam sim no yog generated nyob rau hauv lub caij luv luv Circuit Court thiab lub Circuit Court breaker txiav tawm mus. Lub Circuit Court yuav tsis hlawv ntau. Feem ntau, txoj hauj lwm ntawm qhov luv luv tuaj yeem txiav txim siab los ntawm kev ntsuas kev tiv thaiv ntawm qhov sib koom los yog lub thawv sib txuas.
