Yuav ua li cas txheeb xyuas Circuit Court leakage nrog multimeter
Ib tug multimeter muaj ib tug buzzing hom, uas txhais tau hais tias yog tib lub hlau yog luv luv circuited nrog ob probes, yuav tsis muaj lus teb. Yog hais tias nws yog ib lub voj voog, yuav muaj suab nrov. Qee lub sij hawm, thaum lub cuab yeej nws tus kheej tsis zoo hauv av thiab lub plhaub tau them, lub tshuab multimeter tuaj yeem siv tau. Kev sojntsuam liab yog muab tso rau ntawm lub plhaub, thiab qhov kev sojntsuam dub yog ncaj qha rau hauv av. Qhov no tuaj yeem ntsuas lub zog ntawm lub plhaub xau tam sim no thiab ua rau nws paub hauv cov haujlwm tseem ceeb. Ib yam li ntawd, nws tuaj yeem txuas rau hauv series rau hauv Circuit Court los ntsuas AC thiab DC tam sim no.
Txhawm rau kuaj xyuas qhov hluav taws xob hauv hluav taws xob, lub megohmmeter (shaker) yuav tsum tau siv vim tias qhov hluav taws xob multimeter qis dua (9V) thiab megohmmeter voltage siab dua (500V). Vim hais tias qhov kev khiav hauj lwm voltage ntawm lub Circuit Court yog 220V, nws yog ib qho nyuaj rau kuaj xyuas circuits nrog tsis meej to. Txhawm rau txheeb xyuas qhov xau ntawm lub voj voog nrog lub ntsuas hluav taws xob, lub zog hluav taws xob yuav tsum raug txiav tawm ua ntej. Tom qab tso tawm lub voj voog, ntsuas nws nrog hom tsis kam thiab 2M hom. Cov zaub ib txwm yog 1 (infinite).
Ntsuas seb lub Circuit Court puas nyob rau hauv ib qho kev sib txuas hauv lub xeev los ntawm kev siv lub multimeter nyob rau hauv lub ohm ntau yam. Thaum ntsuas, xaiv qhov ntau yam uas tus ntsuas ntsuas ntsuas ze rau deflection ntawm 0 ohms. Yog hais tias lub voj voog nyob rau hauv ib lub voj voog, txuas ib kawg (A kawg) ntawm lub voj voog mus rau 100 ohm ntau yam ntawm multimeter (liab sojntsuam), thiab txuas cov dub sojntsuam mus rau lwm qhov kawg (B kawg) ntawm Circuit Court yuav tsum tau ntsuas. . Yog tias qhov ntsuas ntsuas yog xoom, nws txhais tau hais tias lub voj voog txuas nrog, tseem hu ua txoj kev. Tsuas yog ib txoj hauv kev tso cai rau tam sim no hla lub voj voog; Yog hais tias lub multimeter ohm ntau pointer ntawm A txog B kawg ntawm kab tsis mus zero ohms, ces kab twb nyob rau hauv ib tug qhib Circuit Court xeev, thiab disconnection yog hu ua ib tug Circuit Court break lossis qhib Circuit Court.
Multimeter tuaj yeem yooj yim txheeb xyuas qhov ua rau hluav taws xob to.
Nrhiav tsis raug thiab tsom xam
Ua ntej, nug txog cov tsos mob tsis raug thiab pom tseeb ntawm tus neeg siv uas qhia txog kev kho; Tom ntej no, soj ntsuam qhov saum npoo kom pom tseeb qhov txhaum, thiab tom qab ntawd mus rau kauj ruam tom ntej ntawm kev tshuaj xyuas.
1. Ua ntej, disconnect lub ntsiab kev rho tawm ntawm tus neeg siv lub hwj huam mov kab, thiab tua tag nrho cov hluav taws xob loads ntawm tus neeg siv, xws li unplugging lub tub yees plug, disconnecting dej twj tso kua mis hloov, thiab lwm yam.
2. Muab cov iav ntawm lub tshuab ntsuas digital tso rau hauv 200M ntau yam ntawm ohm ntau yam, tso ib qho kev sojntsuam ntawm ib qho ntawm ob kab tso tawm ntawm sab load, thiab kov lwm qhov kev sojntsuam tiv thaiv phab ntsa, nyiam dua cov xaim hauv av lossis ib ntus grounding hlau. Tom qab tus naj npawb tso tawm ntawm lub multimeter stabilizes, cov nqi hluav taws xob tiv thaiv ntawm lub ntsiab Circuit Court raug nyeem tawm. Yog tias tus nqi hluav taws xob tiv thaiv tsawg dua 0.5 megohms, ces muaj teeb meem nrog lub ntsiab Circuit Court. Yog hais tias lub rwb thaiv tsev tsis kam yog siab tshaj 0.5 megohms, nws tuaj yeem txiav txim siab tias muaj teeb meem nrog lub ntsiab Circuit Court. Ntsuas lwm cov hlau uas siv tib txoj kev thiab xyuas tus nqi kom pom tias muaj teeb meem nrog lub ntsiab Circuit Court.
3. Tshawb xyuas qhov kev tiv thaiv kev tiv thaiv hluav taws xob ntawm cov ceg ntoo thiab ntau yam khoom siv hluav taws xob, thiab siv tib txoj kev los xyuas lawv ib qho los ntawm ib qho kom txog thaum pom qhov txhaum.
Kev ceev faj ua haujlwm
Thaum siv lub multimeter nyob rau hauv 200M ohm ntau yam, ceev faj tsis txhob kov cov hlau ntawm qhov kev sojntsuam nrog koj txhais tes thaum ntsuas, vim qhov no yuav ua rau kev nyeem ntawv tsis raug.
2. Thaum ntsuas ntau yam khoom siv hluav taws xob, xyuam xim rau kev tso tawm ua ntej txhawm rau tiv thaiv cov khoom siv hluav taws xob los ntawm cov neeg raug mob.
