Dab tsi tuaj yeem yog qhov ua rau qhov tsis zoo nyeem ntawv ntawm lub tshuab multimeter?
Yog hais tias tus neeg kho tshuab multimeter, piv txwv li pointer multimeter kuj cov ntaub ntawv puas, thaum lwm cov ntaub ntawv tuaj yeem raug kuaj ib txwm, qhia tias lub taub hau meter yuav tsum tsis txhob cuam tshuam. Raws li lub hauv paus ntsiab lus ntawm kev ntsuam xyuas ntawm cov ntaub ntawv multimeter kuj, nws muaj feem ntau tias shunt thiab voltage shunt precision resistor ntawm cov ntaub ntawv tsis kam yog burnt tawm los yog tshwm sim los ntawm kev hloov ntawm cov nqi kuj. Qhov feem ntau yog vim li cas rau qhov kev puas tsuaj ntawm cov ntaub ntawv tiv thaiv ntawm lub tshuab multimeter yog tias cov ntaub ntawv tiv thaiv raug kho raws li cov ntaub ntawv hluav taws xob los ntsuas qhov voltage. Yog li ntawd, txhua txhua lub sij hawm ua ntej qhov kev xeem, thawj tus cwj pwm los saib cov iav xaiv tsis yog lawm, los tsim kom muaj kev ntsuam xyuas zoo.
Pointer hom multimeter tiv thaiv thaiv tsis zoo, lwm lub zog siv tau, qhia tias lub taub hau multimeter zoo. Qhov no yog tshwm sim los ntawm kev siv tsis raug. Muaj ob qho laj thawj rau qhov no, ib qho yog rub rau hauv DC tam sim no thaiv thaum ntsuas AC220V voltage hlawv tam sim no thaiv ntawm ob peb tus nqi me me ntawm cov hlau-qhov txhab resistor (tsis hais hom pointer multimeter, lawv yog tag nrho cov hlau-qhov txhab resistors, raug mob nrog tooj liab tsis kam xaim, thiab tus nqi tiv thaiv tsawg heev, piv txwv li, hauv MF-47 hom muaj plaub resistors yog 0.54Ω 5.4Ω 54Ω 540Ω). Tab sis hais txog tus Tswv tias lub multimeter tsuas yog tiv thaiv thaiv muaj teeb meem, ces tsis muaj teeb meem hauv qhov thaiv no.
Qhov thib ob yog vim li cas; rau beginners electronics, electricians, nyob rau hauv kev siv ntawm multimeter tiv thaiv thaiv ntsuas Cheebtsam los yog xyuas lub Circuit Court, tsis yog lub multimeter iav dial rau AC 500V block, ces nyob rau hauv 220V AC kab los yog jack test AC tshwm sim los ntawm. Muaj ntau ntau tus qauv thiab cov chaw tsim khoom siv ntau tus pointer multimeters. Feem ntau thiab siv ntau tshaj qhov qub 500-hom thiab Nanjing ntau lawm ntawm MF-47 hom multimeter. Cov nram qab no MF-47 los tshuaj xyuas thiab daws qhov teeb meem.
① MF{{0}} hom multimeter muaj DC tam sim no thaiv (DCA), tag nrho tsib feem ntau siv thaiv ntxiv rau 5A siab tam sim no nthuav dav, 0 ~ 0. 05mA ~ 0.5mA ~ 5mA - 50mA ~ 500mA.
② Nws muaj DC voltage (DCV) yim feem ntau siv nres ntxiv rau DC2500V tuaj yeem ntsuas kom nthuav dav lub jack. 0 ~ 0.25V ~ 1V ~ 2.5V ~ 10V ~ 50V ~ 250V ~ 500V ~ 1000V ~ 2500V.
③ Nws muaj rau 6 nres rau alternating tam sim no voltage (ACV), 0 ~ 10V ~ 50V ~ 250V ~ 500V ~ 2500.
④ Nws muaj DC tsis kam thaiv (Ω) tsib nres.R × 1Ω R × 10Ω R × 100Ω Rx1KΩ R × 10KΩ Kuj tseem muaj txoj kev buzzer rau kev ntsuas (thaum cov kab tsis kam yog 3 ~ 10Ω, lub buzzer yuav suab). Vim qhov chaw txwv, tshem tawm transistor DC amplification hFE, infrared chaw taws teeb tswj xa cov teeb liab pom, suab qib DB thiab lwm yam haujlwm.
Thawj qhov kev tiv thaiv thaiv kev ntsuas, tus cwj mem dub tso rau hauv ib lub qhov → taub hau tsis zoo → 20.2Ω resistor, 220.4Ω resistor, 2430Ω resistor, lawv tag nrho cov nyob rau hauv parallel nrog lub taub hau rau lub xeev. Thiab lub sijhawm no, tus cwj mem liab tso rau hauv lub multimeter kaum jack los ntawm 1A fuse → 1.5V qhuav cell hauv series nrog cov resistor thiab tom qab ntawd los ntawm 20k resistor → 1...7k resistor thaiv xoom tsis sib xws potentiometer → a 500Ω resistor → lwm lub taub hau calibration R + → taub hau zoo + tus lej. Nkag siab txog lub voj kaw yog qhov zoo, raws li kev paub ntawm tus kheej, koj tuaj yeem nrhiav tau ntawm txoj kev.
