Kev ntsuas qhov ntsuas hluav taws xob ntsuas los ntawm Digital Multimeter thiab Pointer Multimeter
Yog hais tias qhov ntsuas hluav taws xob yog hluav taws xob tseem ceeb, uas yog, 50Hz alternating tam sim no, thiab ob lub ntsuas hluav taws xob tsim nyog, nws tsuas yog txhais tau tias qhov kev tiv thaiv sab hauv ntawm qhov ntsuas hluav taws xob loj dhau. Nyob rau hauv tib zaus, qhov loj tshaj qhov cuam tshuam rau qhov ntsuas qhov ntsuas hluav taws xob ntawm tus pointer multimeter thiab digital multimeter yog qhov sib txawv hauv qhov sib txawv, thiab qhov sib txawv yog qhov loj heev, tsis yog tib qhov kev txiav txim ntawm qhov loj. Thaum qhov kev tiv thaiv sab hauv ntawm qhov ntsuas hluav taws xob me me, qhov sib txawv tsis pom tseeb. Thaum qhov kev tiv thaiv sab hauv ntawm qhov ntsuas hluav taws xob loj, qhov ntsuas ntsuas yuav txawv heev.
Hauv qhov no, nws muaj peev xwm hais tias qhov ntsuas hluav taws xob tsis yog qhov tseeb 220V nyob hlau fais fab kab, lossis qhov ntsuas hluav taws xob tom qab cov hlau nyob dhau los ntawm qee yam khoom siv hluav taws xob, lossis qhov hluav taws xob ntawm lub plhaub ntawm cov khoom siv hluav taws xob.
Tsis suav nrog cov peev txheej saum toj no, nws tsuas yog txhais tau tias ib qho ntawm ob lub moos tsis raug thiab yuav tsum tau kho thiab kho.
Muaj qhov yuam kev nyob rau hauv qhov ntsuas voltage. Ua ntej tshaj plaws, koj yuav tsum xav txog, 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 ntawm kev ua lag luam raug cim nrog lawv cov lus teb ntau zaus thiab AC waveform thaum ntsuas AC voltage. Rau txhua yam zoo tib yam digital multimeters, cov lus teb zaus feem ntau yog 40-1000Hz, thiab qhov yuav tsum tau muaj yog sine yoj (distortion Tsawg dua lossis sib npaug li 1 feem pua). Qhov ntsuas AC voltage tshaj qhov saum toj no tsis tuaj yeem lav qhov ntsuas qhov tseeb. Qhov no yog vim AC / DC (alternating tam sim no / ncaj qha tam sim no) kev hloov pauv hauv Circuit Court nyob rau hauv feem ntau digital multimeters yog tsim los nrog lub hwj chim qis dual op amp TL062. Lub op amp GBW (tau txais-bandwidth khoom) yog txwv, yog li cov multimeter digital tsis tuaj yeem ntsuas High-frequency AC voltage (tau kawg, nws kuj tseem cuam tshuam txog seb qhov hluav taws xob faib hluav taws xob ntawm lub multimeter puas tau them).
Raws li qhov dav dav pointer multimeter (nws yog thawj zaug tsim los ntawm cov neeg Amelikas, nws tau 100 xyoo dhau los), nws cov qauv sab hauv yog qhov yooj yim heev, thiab muaj qhov ntsuas siab siab ntxiv rau diode rectifier ntxiv rau qhov sib faib hluav taws xob resistor (ob peb hom pointer multimeters) sab hauv. Txhawm rau txhim kho qhov rhiab heev ntawm multimeter, AC amplifier tsim los ntawm kev ua haujlwm amplifier yog ntxiv ntawm lub taub hau thiab qhov hluav taws xob faib hluav taws xob), yog li qhov ntsuas qhov tseeb ntawm qhov qub thiab pheej yig multimeter tsis tuaj yeem muab piv nrog digital multimeter txhua. . Feem ntau, tsis muaj peev xwm them nqi, yog li cov lus teb zaus feem ntau yog 40-400Hz.
Qhov ob meters ntsuas tib qhov hluav taws xob AC nrog qhov sib txawv ntawm kaum ntawm V. Ua ntej, koj yuav tsum xyuas lawv cov voltage divider resistor network. Puas yog ib qho ntawm cov resistors hloov tus nqi? Yog tias txhua yam zoo li qub, rau tus pointer multimeter, koj tuaj yeem tshawb xyuas seb tus pointer ntawm lub ntsuas lub taub hau tuaj yeem taw tes rau xoom? Rau cov digital multimeter, koj tuaj yeem tshawb xyuas seb qhov ntsuas hluav taws xob ntawm AC voltage block puas xoob?
Los ntawm txoj kev, yog tias koj xav ntsuas qhov tseeb ntawm AC voltage ntawm arbitrary waveforms, nws raug nquahu kom yuav qhov muaj txiaj ntsig zoo (TRMS) multimeter, uas tuaj yeem ntsuas AC voltages ntawm ntau yam waveforms xws li sine tsis, daim duab peb sab, thiab duab plaub. nthwv dej. tsis cuam tshuam.
