Yuav ua li cas paub qhov txawv ntawm cov khaubncaws sab nraud povtseg sab sauv thiab qis ntawm cov roj hmab los tiv thaiv zoo li qub
Thaum tso cov roj hmab los tiv thaiv zoo li qub, nws yuav tsum paub qhov txawv ntawm cov khaubncaws sab nraud povtseg sab saud thiab qis, vim tias qhov kev tiv thaiv ntawm cov txheej txheem sab saud yuav tsum nyob nruab nrab ntawm 1 * 106 ~ 1 * 109 ohms, thaum qhov kev tiv thaiv ntawm cov txheej txheem qis yuav tsum tsawg dua. tshaj 1 * 106 ohms. lub luag haujlwm raug txiav txim.
Ua ntej tshaj plaws, nws yog qhov yooj yim tshaj kom paub qhov txawv ntawm cov xim. Cov txheej qis ntawm cov roj hmab los tiv thaiv zoo li qub yog xim dub vim muaj cov pa roj carbon dub hauv cov khoom siv, thaum cov xim ntawm cov txheej sab saud yog xim ntsuab, xiav lossis grey, thiab nws kuj yog lwm yam xim. Kev cai xim. Txawm li cas los xij, kuj tseem muaj cov xwm txheej uas cov khaubncaws sab saud thiab qis dua yog xim dub, thiab feem ntau yuav muaj qee yam xim sib txawv, thiab cov txheej txheem thinner yog txheej sab saud. Yog tias txawm tias qhov sib txawv ntawm cov xim tsis tuaj yeem txheeb xyuas, ces nws tsuas yog txiav txim los ntawm kev ntsuas qhov tsis kam. Thaum tsis muaj megohmmeter, qhov siab tshaj plaws ntawm cov multimeter tuaj yeem siv los txheeb xyuas qhov tsis kam ntawm ob sab. Yog tias muaj kev nyeem ntawv ntawm ib sab thiab tsis muaj kev nyeem ntawv nyob rau sab nraud, cov txheej txheem qis dua muaj kev nyeem ntawv, thiab txheej sab saud tsis muaj kev nyeem ntawv. Yog tias tsis muaj kev nyeem ntawv, koj tsuas tuaj yeem hloov mus rau ib lub multimeter nrog ntau qhov loj lossis xyuas seb cov roj hmab los tiv thaiv zoo li cas yog cov khoom tsim nyog.
Txhawm rau kom tsis txhob muaj qhov xwm txheej uas nws nyuaj rau kev paub qhov txawv ntawm cov khaubncaws sab nraud povtseg sab saud thiab qis, peb feem ntau tsis pom zoo rau cov neeg siv khoom los kho cov khoom nrog cov xim dub sab saud thiab qis dua. Yog tias yuav tsum tau siv cov xim dub, peb kuj yuav paub qhov txawv ntawm lawv, kom tsis txhob muaj teeb meem tsis tsim nyog rau cov neeg siv khoom ntau li ntau tau.