Dab tsi yuav yog vim li cas vim li cas qhov kev tiv thaiv ntau ntawm cov tshuab multimeter tawg?
Yog tias qhov teeb tsa tsis kam ntawm cov tshuab multimeter lossis pointer multimeter puas lawm, tab sis lwm qhov chaw tuaj yeem kuaj tau ib txwm, nws txhais tau hais tias lub taub hau meter yuav tsum tsis txhob cuam tshuam. Raws li lub hauv paus ntsiab lus ntawm kev ntsuam xyuas ntawm qhov tsis kam ntawm multimeter, nws yog feem ntau yuav tshwm sim los ntawm qhov tseeb resistor ntawm qhov kev tiv thaiv ntau yam raug hlawv tawm los yog tus nqi hloov pauv. Qhov feem ntau yuav ua rau muaj kev puas tsuaj rau qhov tsis kam ntawm lub tshuab multimeter yog qhov kev tiv thaiv profile yog siv los ua qhov ntsuas hluav taws xob los ntsuas qhov hluav taws xob. Yog li ntawd, ua ntej txhua qhov kev xeem, koj yuav tsum xub xyuas seb lub iav puas raug xaiv raug thiab txhim kho tus cwj pwm zoo.
Yog hais tias qhov hluav taws xob barrier ntawm lub analog multimeter puas lawm thiab lwm yam iav yuav siv tau, nws txhais tau hais tias lub meter taub hau ntawm lub multimeter yog zoo. Qhov no yog tshwm sim los ntawm kev siv tsis raug. Muaj ob qho laj thawj rau qhov no. Ib qho yog ntsuas qhov AC220V voltage thiab hlawv ntau lub zog me me wirewound resistors nyob rau hauv tam sim no thaiv thaum lub DC tam sim no thaiv yog rub tawm (tsis hais tus qauv ntawm pointer multimeter, lawv yog tag nrho cov wirewound resistors, thiab lawv yog tag nrho ua los ntawm constantan Nws yog ua los ntawm cov hlau tsis kam, thiab cov nqi tiv thaiv yog qhov tsawg heev, piv txwv li, muaj 4 resistors hauv MF-47 hom, uas yog 0.54Ω 5.4Ω 54Ω 540Ω). Txawm li cas los xij, tus thawj coj tau hais tias lub tshuab multimeter tsuas muaj teeb meem nrog hluav taws xob thaiv, yog li qhov teeb meem tsis tshwm sim hauv cov iav no.
Qhov thib ob yog vim li cas rau cov pib siv hluav taws xob thiab hluav taws xob, tom qab siv cov khoom siv hluav taws xob ntsuas hluav taws xob ntawm lub tshuab hluav taws xob los yog kuaj xyuas lub voj voog, lawv tsis tau teeb tsa lub multimeter mus rau AC 500V iav, thiab tom qab ntawd txuas nrog 220V AC kab lossis jack. Ua los ntawm AC lub zog thaum kuaj. Muaj ntau ntau siv analog multimeter qauv thiab manufacturers. Cov feem ntau siv thiab dav siv yog cov qub-fashioned 500 hom thiab MF-47 hom multimeter ua nyob rau hauv Nanjing.
①The MF{{0}}} multimeter muaj DC tam sim no theem (DCA), nrog rau tag nrho tsib lub zog ntxiv nrog rau 5A siab tam sim no nthuav dav, 0~0.05mA~ 0.5mA ~ 5mA -50mA ~ 500mA.
② Nws muaj yim lub zog siv rau qhov hluav taws xob ncaj qha tam sim no (DCV) ntxiv rau qhov txuas txuas uas tuaj yeem ntsuas DC2500V. 0 ~ 0.25V ~ 1V ~ 2.5V ~ 10V ~ 50V ~ 250V ~ 500V ~ 1000V ~ 2500V.
③ Muaj rau qib AC voltage, 0 ~ 10V ~ 50V ~ 250V ~ 500V ~ 2500.
④ Nws DC thaiv (Ω) muaj tsib theem. R × 1Ω R × 10Ω R × 100Ω Rx1KΩ R × 10KΩ Kuj tseem muaj txoj kev buzzer thaum ntsuas (thaum tus nqi tsis kam yog 3 ~ 10Ω, lub buzzer yuav suab). Vim muaj qhov chaw tsawg, cov haujlwm xws li transistor DC amplification factor hFE, infrared remote control emission signal detection, thiab audio level DB raug tshem tawm.
Ua ntej, thaum ntsuas hluav taws xob tsis kam, ntxig cov hlau lead dub rau hauv lub qhov → qhov tsis zoo electrode ntawm lub 'meter' → 20.2Ω tsis kam, 220.4Ω tsis kam, thiab 2430Ω tsis kam, uas yog tag nrho cov kev sib txuas nrog lub ntsuas. Lub sijhawm no, cov hlau lead kuaj liab tau muab tso rau hauv kaum lub jack ntawm multimeter thiab dhau los ntawm 1A fuse → 1.5V qhuav roj teeb thiab resistor hauv series thiab tom qab ntawd los ntawm 20k resistor → 1..7k hluav taws xob teeb meem zeroing kuj sib txawv potentiometer → a 500Ω resistor → Calibrate lwm lub 'meter' rau R + → qhov zoo + kos npe ntawm lub 'meter'. Nws yuav yooj yim dua thaum koj nkag siab lub voj kaw. Raws li kev paub ntawm tus kheej, koj tuaj yeem ua raws li cov lus qhia kom pom nws.
Siv lwm multimeter los nrhiav thiab ntsuas cov kev tawm tsam no. Feem ntau, qhov kev ua txhaum no tsuas yog kub hnyiab ntawm cov hluav taws xob thaiv cov khoom siv thaum lub sijhawm. Cov resistors no tsis yog tus qauv tus nqi resistors. Koj tuaj yeem nrhiav tau tus resistor puas thiab txuas rau lawv hauv series, lossis hloov nws nrog ib daim ntawm qhov tsis sib xws ntawm cov hlau tsis sib xws nyob ib ncig ntawm lub resistor. Cov hlau tsis tu ncua tuaj yeem raug txiav los ntawm cov kab mob sib txawv ntawm cov potentiometer.
