Yuav ua li cas yog vim li cas rau qhov tawg nyob rau hauv lub mechanical resistance range ntawm lub multimeter?
Yog hais tias qhov kev tiv thaiv ntau yam ntawm ib tug neeg kho tshuab multimeter, piv txwv li ib tug pointer multimeter, yog puas thaum lwm yam ntau yam yuav raug kuaj ib txwm, nws qhia tau hais tias lub meter taub hau yuav tsum tsis txhob cuam tshuam. Raws li lub hauv paus ntsiab lus ntawm kev ntsuam xyuas ntawm lub multimeter qhov kev tiv thaiv ntau yam, nws yog ib qho zoo heev uas cov precision resistor rau shunt thiab voltage division nyob rau hauv lub resistance range tau hlawv tawm los yog tus nqi kuj tau hloov. Qhov feem ntau yuav ua rau muaj kev puas tsuaj rau kev tiv thaiv ntau yam ntawm lub tshuab multimeter yog los ntsuas qhov voltage los ntawm kev siv qhov kev tiv thaiv ntau yam raws li qhov voltage ntau. Yog li, ua ntej txhua qhov kev xeem, nws yog ib qho tseem ceeb uas yuav tsum tau siv los xyuas seb lub iav raug xaiv kom raug thiab txhim kho tus cwj pwm zoo.
Cov iav tiv thaiv ntawm lub pointer multimeter tawg, tab sis lwm yam iav tuaj yeem siv tau, qhia tias lub taub hau meter yog qhov zoo. Qhov no yog tshwm sim los ntawm kev siv tsis raug. Muaj ob qho laj thawj rau qhov no. Ib qho yog ntsuas ob peb lub me me hlau qhov txhab resistors nyob rau hauv AC220V voltage burning tam sim no hom thaum unplugged los ntawm DC tam sim no hom (tsis hais hom pointer multimeter, lawv yog tag nrho cov hlau qhov txhab resistors ua los ntawm constantan tsis kam hlau. , thiab cov nqi kuj tsawg heev Piv txwv li, nyob rau hauv MF-47 hom, muaj plaub resistors nrog 0.54 Ω, 5.4 Ω, 54 Ω, thiab 540 Ω, feem). Tab sis yog hais tias lub multimeter tau hais tsuas yog muaj teeb meem nrog cov iav tiv thaiv, ces tsis tas yuav muaj teeb meem tshwm sim hauv cov iav no.
Qhov thib ob yog vim li cas; Rau novice electronics thiab electricians, yog hais tias lawv tsis teem lub multimeter rau AC 500V thiab ces sim AC zog nyob rau hauv ib tug 220V AC kab los yog lub qhov (socket) tom qab siv lub multimeter qhov kev tiv thaiv ntau yam los ntsuas Cheebtsam los yog check circuits. Muaj ntau ntau tus qauv thiab cov chaw tsim khoom siv ntau tus pointer multimeters. Feem ntau thiab siv dav yog cov qauv qub 500 thiab MF-47 multimeter ua nyob rau hauv Nanjing.
① MF{{0}}} multimeter muaj hom ncaj qha tam sim no (DCA), nrog rau tag nrho tsib hom kev siv ntau thiab ib qho ntxiv 5A siab tam sim no nthuav qhov (socket), xws li ntawm 0~{{5 }}.05mA ~ 0.5mA ~ 5mA -50mA -500mA.
② Nws muaj yim lub zog siv rau qhov hluav taws xob ncaj qha tam sim no (DCV) thiab lub qhov (socket) nthuav dav uas tuaj yeem ntsuas DC2500V. 0 ~ 0.25V ~ 1V ~ 2.5V ~ 10V ~ 50V ~ 500V ~ 1000V ~ 2500V.
③ Muaj rau theem ntawm kev hloov pauv tam sim no (ACV), xws li ntawm 0 ~ 10V ~ 50V ~ 250V ~ 500V ~ 2500.
④ Nws muaj tsib theem DC tsis kam (Ω). R × 1 Ω R × 10 Ω R × 100 Ω Rx 1K Ω R × 10K Ω Kuj tseem muaj txoj kev buzzer rau kev ntsuas (thaum tus nqi tsis kam ntawm txoj kab nyob nruab nrab ntawm 3-10 Ω, lub buzzer yuav tawm sai sai suab). Vim muaj kev txwv qhov chaw, kev ua haujlwm xws li transistor DC amplification factor hFE, infrared remote control transmission signal detection, and audio level DB raug rho tawm.
