Yuav ua li cas ntsuas tsis kam nrog multimeter thiab nyeem tus nqi tsis kam
Thaum kho cov khoom siv hluav taws xob hauv hluav taws xob, cov khoom tiv thaiv hluav taws xob ntawm lub rooj tsav xwm hluav taws xob muaj txog li 50% ntawm tag nrho cov khoom siv hluav taws xob. Yog tias muaj teeb meem hauv Circuit Court, cov khoom tiv thaiv yog ib qho ntawm cov khoom uas peb yuav tsum tau sim.
Yog li yuav ua li cas siv multimeter los ntsuas qhov tsis kam thiab nyeem tus nqi tsis kam? Cia kuv qhia koj txog qhov teeb meem hauv qab no. Ua ntej ntsuas qhov tsis kam, peb yuav zoo dua ua ob qhov kev hloov kho xoom. Ib qho yog cov neeg kho tshuab xoom-hloov ntawm tus pointer multimeter; qhov thib ob yog ohm xoom-hloov kho. Tom qab ua tiav ob kauj ruam no, koj tuaj yeem xaiv cov ntaub ntawv tsim nyog ua kom zoo dua rau kev ntsuas kev tiv thaiv. Txij li thaum lub teev ntawm lub multimeter qhov kev tiv thaiv ntau yam tsis sib npaug, thaum peb xaiv cov ntaub ntawv magnification, nws yog qhov zoo tshaj plaws los ua kom lub ntsuas ntsuas ntsuas nyob rau hauv qhov sib txawv ntawm qhov ntsuas. , thiab qhov ze ntawm tus pointer yog mus rau nruab nrab ntawm qhov ntsuas, qhov tseeb nws yuav yog. Kuv xav kom muaj tus pointer point ntawm 1/3 txog 2/3 ntawm qhov ntsuas.
Kev nyeem ntawv
Cov txheej txheem ntawm kev nyeem ntawv multimeter tsis nyuaj, uas yog, kev nyeem ntawv ntawm lub taub hau 'meter' yuav tsum tau muab sib npaug, uas yog tus nqi ntawm cov resistor raug ntsuas. Piv txwv li, yog tias koj xav ntsuas tus resistor uas nws tsis kam yog 47 ohms, ces kho qhov ntau ntawm qhov "Rx10" ohm ntau. Lub sijhawm no, tus pointer ntawm multimeter taw qhia rau txoj haujlwm ntawm 4.7, thiab qhov kawg nyeem ntawv yog 4.7x10 uas yog 47 ohms. Yog tias koj ntsuas qhov kev tiv thaiv loj, koj tuaj yeem xaiv qhov kev tiv thaiv loj dua, xws li Rx1k lossis Rx10K. Txoj kev nyeem cov nqi kuj yog tib yam.
Puas yog qhov txiaj ntsig zoo ntawm multimeter tseem ceeb?
True RMS yog dab tsi?
Tsuas yog qhov tseeb rms meters tuaj yeem ntsuas qhov voltage / tam sim no. Txoj kev suav ntawm nws qhov nruab nrab hluav taws xob ntsuas ntsuas ntsuas AC teeb liab yog: tus nqi nruab nrab ntawm qhov ntsuas tus nqi × 1.11=kho rau tus nqi zoo. Tseeb RMS Cov algorithm siv los ntawm lub ntsuas hluav taws xob los ntsuas AC cov cim qhia yog: hauv paus txhais tau tias square algorithm=tseeb RMS. Rau cov sine tsis huv, qhov tseeb RMS lossis qhov nruab nrab tus nqi ntsuas ntsuas tau raug ntsuas, tab sis rau cov tsis-sinusoidal nthwv dej xws li square nthwv dej, daim duab peb sab nthwv dej, thiab sawtooth nthwv dej, tsuas yog qhov tseeb RMS meters tuaj yeem ntsuas qhov tseeb. Niaj hnub no, ntau cov khoom siv hluav taws xob uas tau hloov pauv ntau zaus muaj cov nthwv dej uas tsis yog sinusoidal. Tsuas yog los ntawm qhov muaj tseeb RMS multimeter tuaj yeem ntsuas qhov tseeb tus nqi.
