Qee qhov kev ceev faj hauv kev ntsuas ntawm multimeter
Cov lus ceeb toom ntawm kev ntsuas qhov ntsuas:
(1) Yog tias qhov ntsuas qhov ntsuas tsis zoo tshaj qhov siab tshaj plaws ntawm qhov kev xaiv, nws yuav tso tawm ntau tshaj "1", thiab ntau dua yuav tsum tau xaiv. Rau kev tawm tsam ntau dua 1 MΩ lossis siab dua, nws yuav siv sijhawm ob peb feeb rau kev nyeem ntawv kom ruaj khov. Qhov no yog ib txwm rau kev nyeem ntawv siab;
(2) Thaum tsis muaj cov tswv yim, xws li qhib Circuit Court, nws yuav tso saib "1";
(3) Thaum kuaj xyuas qhov cuam tshuam hauv Circuit Court, xyuas kom meej tias tag nrho cov khoom siv hluav taws xob ntawm qhov ntsuas hluav taws xob raug kaw thiab tag nrho cov capacitors raug tso tawm;
(4) Thaum 200MΩ yog luv-circuited, muaj txog plaub lub cim, uas yuav tsum tau muab rho tawm los ntawm kev nyeem ntawv thaum ntsuas. Piv txwv li, thaum ntsuas l00MΩ tsis kam, nws yuav tshwm sim li 101.0, thiab tus cim plaub yuav tsum tau muab rho tawm;
(5) Qhov zoo ntawm lub capacitor tuaj yeem kuaj pom los ntawm cov ntaub ntawv tiv thaiv. Txuas qhov zoo electrode ntawm lub capacitor nrog cov hlau kuaj liab, thiab qhov tsis zoo electrode ntawm lub capacitor nrog cov hlau lead dub. Kev siv fais fab ntawm lub multimeter yuav them tus capacitor los ntawm kev siv tsis kam. Feem ntau, qhov them qhov hluav taws xob tso tawm los ntawm multimeter yuav hloov ntawm tus nqi qis. Pib nce zuj zus mus txog thaum cov dej ntws tawm. Yog hais tias lub overflow "1" tshwm nyob rau thaum pib ntawm kev them nyiaj, nws txhais tau hais tias lub capacitor yog qhib circuited, thiab yog hais tias nws yog ib txwm tso tawm raws li ib tug ruaj tsis kam los yog "000", nws txhais tau hais tias lub capacitor yog to los yog luv circuited;
(6) Thaum kuaj xyuas qhov txuas ntxiv ntawm lub voj voog, tsuav yog tsis muaj suab nrov thaum lub sijhawm ntsuas, nws tuaj yeem txiav txim siab tias lub voj voog tsis txuas;
(7) Thaum ntsuas qhov tsis kam nrog tus nqi me me, ob qhov kev sim ua ntej yuav tsum luv luv ua ntej, thiab tus kheej tsis kam (feem ntau yog 0.2 rau 0.3 ohms) ntawm qhov kev sib txuas kab ntawm cov kev xeem coj yuav tsum tau nyeem kom kho qhov ntsuas qhov ntsuas tsis kam;
(8) Cov iav tiv thaiv muaj kev tiv thaiv overvoltage muaj nuj nqi, thiab qhov ntsuas tsis raug tam sim ntawm qhov hluav taws xob hauv qhov kev teev tseg yuav tsis ua rau muaj kev puas tsuaj. Piv txwv li, qhov siab tshaj plaws tso zis voltage (DC lossis AC ncov tus nqi) ntawm DT-830 cov ntaub ntawv digital multimeter kuj yog 250 volts, uas yog qhov muaj txiaj ntsig zoo ntawm qhov ntsuas thaum cov ntaub ntawv tsis raug siv los ntsuas qhov voltage, tab sis nws tsis tuaj yeem raug them (xws li roj teeb, tib neeg lub cev, thiab lwm yam) Kev ntsuas kev tiv thaiv, qhov no yuav ua rau qhov tseeb ntawm cov khoom siv multimeter kom txo qis, lossis ua rau nws puas tsuaj.
Kev siv thiab ceev faj ntawm cov ntaub ntawv hFE
Cov iav no tsuas yog siv los ntsuas tus nqi ntawm qhov magnification ntawm triode. Ua ntej ntsuas, nws yuav tsum txiav txim siab seb lub triode yog PNP lossis NPN, thiab qhov polarity ntawm txhua tus pin yuav tsum tau lees paub.
(1) Lwm yam kev ceev faj rau kev siv lub multimeter:
(1) Nyob rau hauv tus txheej txheem ntawm kev siv lub multimeter, tsis txhob kov cov hlau ib feem ntawm lub xeem txhuas nrog koj txhais tes, yog li ntawd nyob rau hauv ib tes, qhov tseeb ntawm kev ntsuas yuav tau guaranteed, thiab ntawm qhov tod tes, tus kheej kev nyab xeeb muaj peev xwm. kuj yuav lav.
(2) Thaum ntsuas qee qhov hluav taws xob, nws tsis tuaj yeem hloov lub zog thaum ntsuas, tshwj xeeb tshaj yog thaum ntsuas qhov hluav taws xob siab lossis tam sim no loj, yuav tsum tau them nyiaj ntau dua. Txwv tsis pub, lub multimeter yuav raug puas tsuaj. Yog tias koj xav tau hloov lub zog, koj yuav tsum txiav tawm qhov kev xeem ua ntej, thiab tom qab ntawd ntsuas tom qab hloov lub zog.
(2) Kev ceev faj rau kev saib xyuas digital multimeter:
Cov multimeter digital yog cov cuab yeej hluav taws xob precision, tsis txhob hloov lub voj voog ntawm qhov xav tau, thiab xyuam xim rau cov ntsiab lus hauv qab no:
① Tsis txhob siv tshaj qhov ntau;
② Thov tsis txhob siv lub multimeter thaum lub roj teeb tsis tau teeb tsa lossis lub hau rov qab tsis nruj;
③ Lub roj teeb thiab fuse tuaj yeem hloov tau tsuas yog tom qab qhov kev xeem cov txhuas raug tshem tawm ntawm lub tshuab multimeter thiab lub zog hluav taws xob raug txiav tawm. Hloov roj teeb: Ua tib zoo saib xyuas kev siv 9V roj teeb. Yog tias koj xav hloov lub roj teeb, qhib lub hau npog rov qab thiab hloov nrog tib hom roj teeb. Thaum hloov lub fuse, thov siv tib hom fuse;
④ Tom qab siv lub multimeter, qhov hloov pauv yuav tsum muab tso rau hauv txoj haujlwm "OFF". Yog tias nws tsis siv sijhawm ntev, lub roj teeb hauv lub tshuab hluav taws xob yuav tsum tau muab tshem tawm los tiv thaiv lub roj teeb los ntawm corroding lwm yam khoom hauv lub ntsuas.
