Yuav ua li cas kho lub TV motherboard nrog multimeter
Ua ntej, koj yuav tsum muaj peev xwm siv lub multimeter, thiab qhov thib ob, koj yuav tsum muaj peev xwm nyeem daim duab kos duab.
Hauv kev ntsuas ntawm Circuit Court, muaj ntau lub ntsiab lus tseem ceeb, ib qho yog qhov khoom siv hluav taws xob, qhov thib ob yog qhov tam sim no, thiab qhov thib peb yog qhov qub.
Ntsuas qhov voltage thiab tam sim no yuav tsum muaj lub schematic Circuit Court, raws li daim duab schematic ntawm tus nqi cim ntawm kev sib piv kev xeem, yog hais tias tus deviation loj (ntau tshaj 5%), ces peb yuav tsum condense lub Circuit Court tsis zoo, tsom ntawm kev txheeb xyuas qhov cuam tshuam mus rau lub voj voog ntawm tus thawj.
Kev ntsuas ntawm ntau yam ntawm cov lus qub yuav tsum nkag siab txog cov yam ntxwv ntawm tus thawj, txhawm rau txiav txim kom raug.
Cov lus qhia rau kev siv multimeter:
(1) nyob rau hauv kev siv multimeter, yuav tsum tau nqa tawm ua ntej lub "mechanical zero", uas yog, nyob rau hauv tsis muaj kev ntsuas lub hwj chim, thiaj li hais tias tus multimeter pointer nyob rau hauv txoj hauj lwm ntawm xoom voltage los yog xoom tam sim no.
(2) Nyob rau hauv tus txheej txheem ntawm kev siv lub multimeter, koj yuav tsum tsis txhob kov cov hlau ib feem ntawm tus cwj mem nrog koj txhais tes, thiaj li yuav xyuas kom meej qhov tseeb ntawm kev ntsuas ntawm ib sab tes, thiab xyuas kom meej tus kheej kev nyab xeeb ntawm qhov tod tes.
(3) Thaum ntsuas qee qhov hluav taws xob, koj yuav tsum tsis txhob hloov lub iav tib lub sijhawm ntsuas, tshwj xeeb tshaj yog thaum ntsuas qhov hluav taws xob siab lossis siab tam sim no, koj yuav tsum tau them sai sai rau nws. Txwv tsis pub, lub multimeter yuav raug puas tsuaj. Yog tias koj xav hloov lub zog, koj yuav tsum xub txiav lub cwj mem, hloov lub zog thiab rov qab mus rau qhov ntsuas.
(4) Thaum siv lub multimeter, nws yuav tsum tau muab tso rau kab rov tav kom tsis txhob ua yuam kev. Nyob rau tib lub sijhawm, nws yuav tsum tau sau tseg kom tsis txhob muaj kev cuam tshuam ntawm sab nraud magnetic teb ntawm multimeter.
(5) Thaum siv cov multimeter tiav lawm, qhov hloov pauv hloov yuav tsum muab tso rau hauv qhov siab tshaj plaws ntawm AC voltage. Yog tias nws tsis siv sijhawm ntev, lub roj teeb hauv lub ntsuas hluav taws xob yuav tsum tau muab tshem tawm kom tsis txhob muaj lub roj teeb corroding lwm yam khoom siv hauv lub ntsuas.
Kev siv ntawm ohm block:
Ua ntej, xaiv qhov sib npaug tsim nyog. Nyob rau hauv lub ohmmeter tsis kam ntsuas, yuav tsum xaiv qhov tsim nyog tus lej sib npaug, kom tus pointer qhia nyob rau hauv nruab nrab tus nqi ntawm cov zej zog. Nws yog qhov zoo tshaj kom tsis txhob siv sab laug thib peb ntawm qhov ntsuas, qhov no ntawm qhov ntsuas yog qhov tsis zoo heev.
Thib ob, mus rau xoom ua ntej siv.
Thib peb, tsis tuaj yeem raug nqi ntsuas.
Plaub, qhov ntsuas ntsuas tsis tuaj yeem muaj cov ceg sib txuas.
Thib tsib, kev ntsuas ntawm transistors, electrolytic capacitors thiab lwm yam polar Cheebtsam ntawm qhov sib npaug tsis kam, yuav tsum tau them sai sai rau qhov polarity ntawm ob tus cwj mem.
Rau, nrog ib tug multimeter nrog sib txawv multiplication ntawm lub ohm block los ntsuas qhov sib npaug kuj ntawm non-linear Cheebtsam, qhov ntsuas kuj tsis zoo ib yam. Qhov no yog vim qhov nruab nrab tsis kam thiab tag nrho tam sim no ntawm txhua qhov thaiv yog qhov sib txawv los ntawm qhov ntsuas qhov ntsuas, feem ntau qhov me dua qhov sib npaug, qhov me dua qhov ntsuas qhov ntsuas tsis kam.
