Yuav ua li cas los xyuas qhov zoo ntawm lub charger nrog ib tug multimeter
Thawj txoj kev: Siv cov iav tsis muaj zog lossis diode iav ntawm multimeter los xyuas seb cov kab hluav taws xob tuaj yeem qhib.
Koj tuaj yeem ntsaws rau hauv lub charger, thiab siv DC voltage iav los ntsuas seb puas muaj DC voltage ze li ntawm 300V ntawm lub high-voltage lim capacitor (EJ). 220V tswv yim. Qhov no yog los txiav txim seb qhov txhaum yog tshwm sim los ntawm kev txiav tawm ntawm cov hlau.
Cov kauj ruam tshuaj xyuas yog raws li nram no:
1. Ntsuas BC, BD, GH, thiab GI ua ntu zus nrog cov iav tiv thaiv lossis diode iav ntawm multimeter. Cov txiaj ntsig yuav tsum yog txhua tus channel. Yog tias ib qho tsis ua haujlwm, qhov ntawd yog qhov yuam kev. Piv txwv li, yog tias qhov ntsuas tau nce mus txog GH, tab sis GI tsis ua tiav, nws txhais tau hais tias hom lim hom muaj qhov qhib Circuit Court (tej zaum cov pins raug tshem tawm).
2. Tom qab ntawd, ntsuas qhov ntsuas hluav taws xob rau pem hauv ntej ntawm 4 diodes nrog multimeter diode tester, ntsuas D → E, I → E, J → I, J → D nyob rau hauv lem, (ua tib zoo saib cov polarity) kom pom tias tus nqi yog. ib txwm, yog tias tsis yog Nws yog qhov qub, lub diode yuav tsum raug puas.
Tom qab ua tiav cov kauj ruam saum toj no, koj tuaj yeem pom qhov teeb meem. Thaum cov khoom no raug kev co, cov khoom yuav raug loosened, uas ua rau desoldering thiab kev sib cuag tsis zoo. Tom qab desoldering, yog tias koj tsis ua tib zoo saib, koj tsis tuaj yeem pom lawv, thiab qee qhov tsis tuaj yeem pom txhua, yog li nws raug pom zoo kom rov ua cov khoom no. Rau lub transformer, nws tuaj yeem raug tshem tawm thiab kuaj xyuas.
Txoj kev thib ob: txoj kev ntsuas hluav taws xob
Kho lub multimeter mus rau qhov voltage ntau los ntsuas qhov voltage. Yog tias tsis muaj qhov hluav taws xob, tshem tawm cov khoom siv hluav taws xob thiab sim thawj zaug nrog kev thaiv hluav taws xob. Yog tias qhov tsis kam yog kaum ntawm ohms, nws txhais tau tias nws nyob rau hauv qhov zoo, txwv tsis pub nws puas.
Kev sim txoj kev: Txuas ib qho kev xeem coj ntawm lub multimeter mus rau cov tub ntxhais txuas thiab lwm qhov kev sim ua rau cov tub ntxhais sab nraud, thiab sib piv cov ntsuas hluav taws xob nyeem ntawm qhov voltage block ntawm multimeter nrog tus nqi nominal. Yog hais tias nws nyob ib ncig ntawm 7V, ces nws yog zoo.
