Kev soj ntsuam ntawm qhov ntsuas qhov ntsuas qhov yuam kev ntawm digital multimeter thiab pointer multimeter
Yog hais tias qhov ntsuas hluav taws xob yog lub zog hluav taws xob, uas yog 50Hz AC, thiab ob lub ntsuas hluav taws xob tsim nyog, nws tsuas tuaj yeem qhia tau tias qhov ntsuas sab hauv ntawm qhov ntsuas hluav taws xob siab dhau lawm. Qhov loj tshaj plaws uas cuam tshuam rau qhov ntsuas qhov ntsuas hluav taws xob ntawm tus pointer multimeter thiab digital multimeter ntawm tib zaus yog qhov sib txawv ntawm qhov tsis kam sab hauv, uas yog qhov tseem ceeb thiab tsis nyob rau tib qhov kev txiav txim siab. Thaum qhov kev tiv thaiv sab hauv ntawm qhov ntsuas hluav taws xob me me, qhov sib txawv tsis tseem ceeb. Thaum qhov kev tiv thaiv sab hauv ntawm qhov ntsuas hluav taws xob loj, qhov ntsuas ntsuas yuav txawv heev.
Hauv qhov xwm txheej no, nws muaj peev xwm hais tias qhov ntsuas hluav taws xob tsis yog qhov tseeb 220V nyob xaim hluav taws xob, lossis qhov ntsuas hluav taws xob tom qab cov xaim nyob hla dhau ntawm qee yam khoom siv hluav taws xob, lossis qhov hluav taws xob ntawm cov khoom siv hluav taws xob xau.
Tsis suav nrog cov peev txheej saum toj no tsuas yog qhia tau tias ib qho ntawm ob metres tsis raug thiab yuav tsum tau saib xyuas thiab ntsuas ntsuas.
Muaj qhov yuam kev hauv kev ntsuas qhov hluav taws xob. Ua ntej, koj yuav tsum paub seb qhov zaus ntawm qhov ntsuas AC voltage hauv Hz yog dab tsi? Puas yog qhov hluav taws xob no yog qhov ntshiab sine yoj?
Txhua hom multimeters tam sim no muaj nyob rau hauv kev ua lag luam muaj lawv cov lus teb ntau zaus thiab AC waveform qhia hauv lawv phau ntawv qhia thaum ntsuas AC voltage. Rau ntau yam zoo tib yam digital multimeters, lawv cov lus teb zaus feem ntau yog 40-1000Hz, thiab nws 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 hais tias feem ntau AC / DC hloov dua siab tshiab circuits nyob rau hauv cov multimeters yog tsim los siv tsawg-power dual ua hauj lwm amplifier TL062, uas muaj tsawg GBW (tau txais bandwidth khoom), yog li cov multimeters tsis tau ntsuas high-frequency AC voltage (ntawm chav kawm, nws kuj nyob ntawm seb. ntawm seb qhov hluav taws xob faib hluav taws xob ntawm multimeter puas tau them nyiaj).
Raws li rau tus qauv pointer hom multimeter (uas yog thawj zaug tsim los ntawm cov neeg Amelikas thiab tau nyob ib puag ncig rau 100 xyoo), nws cov qauv sab hauv yog qhov yooj yim heev, suav nrog lub taub hau siab rhiab heev, diode rectification, thiab voltage divider (ob peb pointer type multimeters. ntxiv ib qho kev ua haujlwm amplifier nruab nrab ntawm lub taub hau 'meter' thiab voltage divider los txhim kho rhiab heev). Yog li ntawd, qhov ntsuas qhov tseeb ntawm qhov qub thiab pheej yig multimeter tsis tuaj yeem muab piv rau cov digital multimeter. Qhov hluav taws xob faib hluav taws xob ntawm hom ntsuas no feem ntau tsis muaj peev xwm them nyiaj, yog li nws cov lus teb zaus feem ntau yog 40-400Hz.
Ob meters ntsuas tib qhov hluav taws xob AC nrog qhov sib txawv ntawm ntau kaum ntawm volts. Ua ntej, koj yuav tsum tau xyuas lawv cov voltage divider kuj network saib seb puas muaj ib qho ntawm cov resistors tau hloov tus nqi? Yog tias txhua yam zoo li qub, koj tuaj yeem tshawb xyuas seb tus pointer ntawm pointer type multimeter tuaj yeem taw tes rau xoom txoj haujlwm? Rau ib qho digital multimeter, koj puas tuaj yeem tshawb xyuas yog tias lub ntsuas ntsuas hluav taws xob ntawm nws cov AC voltage ntau yog xoob?
Los ntawm txoj kev, yog tias koj xav kom raug ntsuas qhov AC voltage ntawm ib qho waveform, nws raug nquahu kom yuav qhov muaj txiaj ntsig zoo (TRMS) multimeter. Hom multimeter no tuaj yeem ntsuas qhov tseeb ntawm AC voltage ntawm ntau yam waveforms xws li sine waves, triangular waves, rectangular waves, thiab lwm yam, thiab tsis muaj kev cuam tshuam.
Qhov no portable tiag tiag tus nqi multimeter feem ntau siv TRMS integrated circuits AD736 thiab AD737 (tsim los ntawm Analog Devices nyob rau hauv lub tebchaws United States) rau lub AC / DC converter Circuit Court, tso cai rau kev ntsuas ntawm AC voltage nyob rau hauv tej waveform.
