Txoj kev ntsuas qhov zoo ntawm chargers nrog multimeter
Thawj txoj kev: Siv qhov kev tiv thaiv ntau lossis diode ntau ntawm ib lub multimeter los ntsuas seb cov kab hluav taws xob nkag tau qhib.
Koj tuaj yeem ntsaws rau hauv lub charger thiab siv DC voltage ntau los ntsuas seb puas muaj DC voltage ze li ntawm 300V ntawm lub high-voltage lim capacitor (EJ). Yog tias nws tseem tsis tau muaj, siv AC ntau yam los ntsuas seb puas muaj AC 220V input ntawm lub hwj chim input kab (BG). Yuav kom txiav txim seb qhov txhaum yog tshwm sim los ntawm cov hlau tawg.
Cov kauj ruam tshuaj xyuas yog raws li nram no:
1. Ntsuas BC, BD, GH, thiab GI nyob rau hauv ib theem zuj zus siv ib tug multimeter kuj los yog diode ntau yam, thiab cov kev tshwm sim yuav tsum tag nrho cov nyob rau hauv tib txoj kev. Yog hais tias ib tug tsis ua hauj lwm, ces qhov ntawd yog faulty. Piv txwv li, yog tias GH txuas nrog thiab GI tsis txuas nrog, nws qhia tau hais tias hom lim hom muaj qhov qhib Circuit Court (tejzaum nws yog vim tus pin detachment).
2. Tom qab ntawd, siv lub diode iav ntawm lub multimeter los ntsuas lub zog pem hauv ntej poob ntawm plaub lub diodes, thiab ntsuas D → E, I → E, J → I, J → D nyob rau hauv ib ntu (ua tib zoo saib cov polarity) kom pom. seb tus nqi yog qhov qub. Yog tias tsis yog, cov diodes yuav tsum raug puas tsuaj.
Los ntawm ua tiav cov kauj ruam saum toj no ntawm kev daws teeb meem, koj tuaj yeem txheeb xyuas qhov teeb meem. Thaum cov khoom no raug kev co, lawv tuaj yeem xoob thiab ua rau muaj kev sib tsoo, ua rau muaj kev sib cuag tsis zoo. Tom qab detachment, yog tsis ua tib zoo tshuaj xyuas, nws yuav tsis pom, thaum ib txhia tsis pom kiag li. Yog li ntawd, nws raug pom zoo kom rov welding cov khoom no. Rau transformers, lawv tuaj yeem raug tshem tawm rau kev tshuaj xyuas.
Txoj kev thib ob: lub hwj chim ntawm txoj kev sim
Kho lub multimeter mus rau qhov voltage ntau rau kev ntsuas voltage. Yog tias tsis muaj qhov hluav taws xob, tshem tawm cov khoom siv hluav taws xob thiab siv qhov kev tawm tsam los ntsuam xyuas cov theem pib. Yog hais tias qhov kev tiv thaiv yog kaum ntawm ohms, nws qhia tau hais tias tus mob zoo, txwv tsis pub nws puas.
Kev sim txoj kev: Txuas ib qho txhuas ntawm multimeter mus rau cov tub ntxhais hlau thiab lwm qhov ua rau cov tub ntxhais sab nraud. Sib piv cov voltage nyeem ntawm qhov voltage ntau ntawm lub multimeter nrog tus nqi nominal. Yog hais tias nws nyob ib ncig ntawm 7V, ces nws yog zoo.
