Digital multimeter/pointer multimeter voltage ntsuas qhov yuam kev
Yog tias qhov ntsuas hluav taws xob yog AC lub zog, uas yog 50Hz, thiab ob qho tib si muaj peev xwm, nws tsuas tuaj yeem qhia tau tias qhov ntsuas sab hauv ntawm qhov ntsuas hluav taws xob siab dhau lawm. Qhov loj tshaj qhov 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 kev ua haujlwm 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, qhov ntsuas qhov ntsuas hluav taws xob yuav tsis yog qhov tseeb 220V cov kab hluav taws xob nyob, lossis qhov ntsuas hluav taws xob tom qab cov kab nyob dhau los ntawm qee cov khoom siv hluav taws xob, lossis qhov hluav taws xob ntawm lub plhaub hluav taws xob.
Tsis suav nrog cov peev txheej saum toj no, nws tsuas tuaj yeem qhia tau tias ib qho ntawm ob metres tsis raug thiab yuav tsum tau saib xyuas thiab calibration.
Muaj qhov yuam kev hauv kev ntsuas qhov hluav taws xob. Ua ntej, koj yuav tsum paub meej tias 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 muaj nyob rau hauv kev ua lag luam tam sim no muaj lawv cov lus teb ntau zaus thiab AC waveform cim ntawm 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 txwv nce bandwidth khoom (GBW). Yog li, cov multimeters digital tsis tuaj yeem ntsuas qhov siab AC voltage (ntawm chav kawm, nws kuj nyob ntawm seb lub multimeter's voltage divider resistor puas tau them).
Raws li qhov zoo tib yam pointer multimeter (uas yog thawj zaug tsim los ntawm Asmeskas thiab tau 100 xyoo txij li thaum), nws cov qauv sab hauv yog yooj yim heev, nrog lub taub hau rhiab heev + diode rectification + voltage divider (ob peb pointer multimeter ntxiv AC amplifier tsim los ntawm 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 nrog cov digital multimeter. Qhov hluav taws xob faib hluav taws xob ntawm hom ntsuas no feem ntau tsis them rau lub peev xwm, 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 xyuas lawv cov voltage divider resistor tes hauj lwm saib seb puas muaj ib qho ntawm cov resistors tau hloov tus nqi? Yog tias txhua yam zoo li qub, rau lub pointer multimeter, koj tuaj yeem tshawb xyuas seb nws lub taub hau pointer tuaj yeem taw tes rau xoom? Rau ib lub multimeter digital, koj tuaj yeem tshawb xyuas yog tias lub ntsuas hluav taws xob calibration rau nws qhov AC voltage ntau yog xoob?
Los ntawm txoj kev, yog tias koj xav kom raug ntsuas AC voltage ntawm ib qho waveform, nws raug nquahu kom yuav qhov tseeb RMS (TRMS) multimeter. Qhov no multimeter tuaj yeem ntsuas AC voltage ntawm ntau yam waveforms xws li sine waves, triangular waves, rectangular waves, etc., thiab tsis muaj kev cuam tshuam.
