Digital multimeter thiab pointer multimeter ntsuas voltage yuam kev tsom xam
Yog hais tias qhov ntsuas hluav taws xob yog qhov tseem ceeb, uas yog, 50Hz AC, ob lub ntsuas hluav taws xob tsim nyog, nws tsuas yog txhais tau tias qhov ntsuas qhov ntsuas hluav taws xob sab hauv kuj loj dhau. Tib zaus nyob rau hauv lub pointer multimeter thiab digital multimeter cuam tshuam cov txiaj ntsig ntawm qhov ntsuas hluav taws xob ntawm qhov loj tshaj plaws yog qhov kev tiv thaiv sab hauv yog qhov sib txawv, qhov sib txawv loj heev, tsis yog nyob rau hauv qhov kev txiav txim ntawm qhov loj. Thaum ntsuas qhov ntsuas hluav taws xob sab hauv yog me me, qhov sib txawv tsis pom tseeb, thiab thaum ntsuas qhov ntsuas hluav taws xob sab hauv yog qhov loj, qhov ntsuas ntsuas yuav txawv heev.
Qhov xwm txheej no muaj peev xwm hais tias qhov ntsuas hluav taws xob tsis yog tiag tiag 220V hluav taws xob hluav taws xob hluav taws xob, lossis hluav taws xob los ntawm qee yam khoom siv hluav taws xob ntsuas hluav taws xob, lossis cov khoom siv hluav taws xob xau hluav taws xob hluav taws xob.
Tsis suav nrog cov peev txheej saum toj no, tsuas yog txhais tau hais tias ib qho ntawm ob lub rooj tsis raug tso cai, yuav tsum tau kho thiab kho.
Kev ntsuas qhov yuam kev, ua ntej ntawm tag nrho cov, koj yuav tsum paub, qhov zaus ntawm qhov ntsuas AC voltage yog pes tsawg Hz, qhov voltage no tsis yog ntshiab sine yoj?
Tam sim no ua lag luam muaj txhua yam ntawm multimeter, nws phau ntawv tau sau nrog lub rooj hauv kev ntsuas ntawm AC voltage zaus teb ntau thiab AC waveform. Rau ntau yam zoo tib yam digital multimeter, nws cov lus teb zaus feem ntau yog 40-1000Hz, thiab yuav tsum yog sine yoj (distortion Tsawg dua lossis sib npaug li 1%). Qhov ntsuas AC voltage tshaj qhov saum toj no tsis lav qhov ntsuas qhov tseeb. Qhov no yog vim feem ntau ntawm cov multimeter nyob rau hauv lub AC / DC (AC / DC) hloov dua siab tshiab Circuit Court yog ib tug tsawg-power dual op-amp TL062 los tsim, lub op-amp GBW (tau txais bandwidth khoom) yog txwv, yog li cov digital multimeter tsis tuaj yeem ntsuas qhov siab AC voltage (ntawm chav kawm, tab sis kuj nrog lub multimeter's voltage divider resistor yog them).
Raws li qhov dav dav pointer multimeter (uas yog thawj zaug tsim los ntawm Asmeskas, 100 xyoo dhau los), nws cov qauv sab hauv yog qhov yooj yim heev, lub taub hau sab hauv ntawm lub siab-rhiab heev + diode rectifier + voltage divider resistor (ob peb pointer multimeter nyob rau hauv thiaj li yuav. txhim kho lub rhiab heev ntawm lub taub hau thiab lub divider resistor ntawm qhov sib ntxiv ntawm kev ua haujlwm amplifiers muaj li ntawm AC amplifiers), yog li qhov qub, pheej yig multimeter ntsuas qhov tseeb tsis piv rau digital multimeter. Tsis tuaj yeem muab piv nrog cov digital multimeter, lub rooj voltage divider resistor feem ntau tsis muaj peev xwm them nyiaj, yog li nws cov lus teb zaus feem ntau yog 40-400Hz.
Ob 'meter' los ntsuas tib qhov sib txawv AC voltage ntawm kaum ntawm V, thawj qhov koj yuav tsum tau sim lawv qhov voltage divider resistor network, seb ib qho ntawm cov resistors hloov tus nqi? Yog tias lawv zoo li qub, rau tus pointer multimeter koj tuaj yeem saib nws lub taub hau pointer tuaj yeem taw tes rau xoom? Rau cov multimeters digital, koj tuaj yeem pom yog tias lub ntsuas hluav taws xob calibration rau AC voltage thaiv yog xoob?
Los ntawm txoj kev, yog tias koj xav ntsuas qhov tseeb ntawm AC voltage ntawm txhua lub waveform, nws raug nquahu kom yuav qhov tseeb rms (TRMS) multimeter, uas tuaj yeem ntsuas qhov tseeb ntawm AC voltage ntawm ntau lub waveforms, xws li sine, daim duab peb sab, duab plaub, thiab lwm yam. ., thiab tsis muaj dab tsi ua nrog distortion.
