Pointer Multimeter Test Lub Tswv Yim
Ua ntej kuaj lub pointer multimeter, ua ntej, tso lub multimeter nyob rau hauv kab rov tav thiab saib seb nws cov koob yog nyob rau ntawm xoom point (zero point ntawm tam sim no thiab voltage scale), yog hais tias tsis yog, kho lub "mechanical zero adjustment" nyob rau hauv lub taub hau. ua tus pointer taw tes rau xoom point. Xaiv cov khoom ntsuas kom raug thiab qhov hloov pauv ntawm lub multimeter. Yog tias qhov kev txiav txim ntawm qhov loj ntawm qhov ntsuas tus nqi yog paub, ces xaiv qhov sib thooj ntawm qhov kev txiav txim ntawm qhov loj. Yog tias koj tsis paub qhov kev txiav txim ntawm qhov loj ntawm qhov ntsuas tus nqi, koj yuav tsum xaiv qhov siab tshaj plaws los pib qhov ntsuas, thiab tom qab ntawd txo qhov ntau thaum lub kaum sab xis ntawm deflection ntawm tus pointer me dhau los nyeem kom raug. Feem ntau, lub kaum sab xis deflection ntawm tus pointer tsis tsawg dua 20% ntawm qhov siab tshaj plaws ntsuas raws li qhov tsim nyog ntau yam.
Kev siv voltmeter
Multimeter thiab txuas nrog Circuit Court nyob rau hauv kev ntsuam xyuas, nyob rau hauv kev ntsuas ntawm DC voltage, yuav tsum tau them sai sai rau lub polarity ntawm qhov ntsuas voltage, uas yog, tus cwj mem liab mus rau high voltage kawg, tus cwj mem dub mus rau qhov tsawg voltage kawg. Yog tias koj tsis paub qhov polarity ntawm qhov ntsuas qhov ntsuas hluav taws xob, koj tuaj yeem sim cov qauv ntsuas raws li tau piav qhia saum toj no thaum ntsuas tam sim no, xws li tus pointer deflects mus rau sab xis, koj tuaj yeem ntsuas; xws li tus pointer deflects rau sab laug, cov cwj mem liab thiab dub hloov mus rau qhov chaw sib txawv, tuaj yeem ntsuas. Kev ntsuas ntawm qhov hluav taws xob hauv hluav taws xob yog qhov loj heev, nws yuav tsum muaj qhov ntsuas hluav taws xob sab hauv yog qhov loj dua, txhawm rau ua kom qhov ntsuas qhov tseeb. Nyob rau lub sijhawm no, koj yuav tsum tau hloov qhov voltage rhiab heev (ntau dua sab hauv tsis kam) ntawm multimeter los ntsuas. Hauv kev ntsuas ntawm AC voltage, tsis tas yuav xav txog qhov polarity ntawm qhov teeb meem, tsuav yog lub multimeter txuas nrog rau qhov sib npaug los ntsuas ntawm ob qhov kawg tuaj yeem ua tau. Tsis tas li ntawd, feem ntau tsis tas yuav xaiv lub iav loj lossis xaiv lub siab voltage rhiab heev multimeter. Lub zog sab hauv ntawm AC fais fab mov yog me dua li cov gel. Nws yog ib qho tsim nyog sau cia tias qhov ntsuas AC voltage tuaj yeem tsuas yog sinusoidal, thiab nws zaus yuav tsum tsawg dua lossis sib npaug rau qhov tso cai ua haujlwm zaus ntawm multimeter, txwv tsis pub nws yuav ua rau muaj qhov yuam kev loj. Tsis txhob toggle qhov ntau yam xaiv hloov thaum ntsuas qhov hluav taws xob ntau dua (piv txwv li, 220v), kom tsis txhob tsim cov arc thiab hlawv cov neeg sib cuag ntawm qhov hloov pauv hloov tawm. Nyob rau hauv kev ntsuas ntawm high voltage ntau dua los yog sib npaug rau 100v, yuav tsum tau them sai sai rau qhov zoo ua ntej - ib tug cwj mem tsau nyob rau hauv Circuit Court nyob rau hauv kev sim nyob rau hauv cov pej xeem thiab ces siv lwm tus cwj mem los kov lwm tus - qhov kawg ntawm lub xeem point. Yog hais tias qhov ntau yam tsis txaus, yuav tsum tau hloov lwm lub iav ntsuas ntxiv rau lub multimeter tsuas yog tsim nyog rau kev ntsuas qhov ntim zaus, xws li DC voltage ntawm lub voj voog, tab sis kuj yuav tsum tau txuas nrog hauv series nrog 0.1uF / 450V capacitor. yuav yog DC kev rho tawm thiab tom qab ntawd ntsuas, hauv kev ntsuas ntawm qhov inductive tsis kam ntawm Circuit Court ntawm qhov hluav taws xob yuav tsum tau ntsuas tom qab ntsuas ntawm multimeter disconnected thiab tom qab ntawd kaw lub hwj chim. Txwv tsis pub, thaum txiav tawm lub hwj chim mov, vim hais tias ntawm tus kheej-inductive phenomenon ntawm inductive Cheebtsam nyob rau hauv lub Circuit Court, nws yuav ua tau siab heev thiab tej zaum yuav hlawv tawm lub multimeter.
Kev siv Ammeter
Multimeter txuas nrog hauv series hauv Circuit Court nyob rau hauv kev sim, yuav tsum tau them sai sai rau cov kev taw qhia ntawm qhov tam sim no. Qhov ntawd yog hais tias, tus cwj mem liab txuas nrog rau qhov kawg ntawm qhov ntws tawm tam sim no, thiab tus cwj mem dub txuas nrog rau qhov kawg ntawm qhov kev tawm tam sim no. Yog tias koj tsis paub qhov kev taw qhia ntawm qhov ntsuas tam sim no, koj tuaj yeem txuas tus cwj mem ntawm ib qho kawg ntawm lub voj voog, lwm tus cwj mem ntawm lwm qhov kawg ntawm lub voj voog maj mam kov, yog tias tus taw tes tig mus rau sab xis, qhia tias cov xaim muaj tseeb. ; Yog hais tias tus pointer viav vias mus rau sab laug (qis dua xoom), qhia tias cov xaim tsis raug, lub multimeter yuav tsum tau hloov mus rau txoj hauj lwm ntawm ob tus cwj mem. Nyob rau hauv lub pointer deflection lub kaum sab xis yog ntau dua los yog sib npaug rau qhov siab tshaj plaws teev 20%, sim siv ntau yam iav. Vim tias qhov loj dua qhov ntau, qhov me me ntawm shunt tsis kam, qhov me dua qhov sib npaug hauv qhov tsis kam ntawm ammeter, qhov me dua qhov yuam kev qhia los ntawm kev ntsuas Circuit Court. Nyob rau hauv kev ntsuas ntawm cov tam sim no loj (xws li 500mA), tsis txhob toggle qhov ntau yam xaiv hloov thaum lub sij hawm ntsuas, thiaj li tsis mus tsim ib tug arc, hlawv cov neeg ntawm lub changeover hloov.
