Ib qho ntawm cov haujlwm tseem ceeb tshaj plaws ntawm DMM yog ntsuas qhov voltage. Kev ntsuam xyuas qhov voltage feem ntau yog thawj kauj ruam hauv kev daws teeb meem hauv Circuit Court. Yog tias tsis muaj qhov hluav taws xob lossis yog qhov hluav taws xob tsawg dhau lossis siab dhau, thawj qhov yuav tsum tau ua yog kho qhov teeb meem ntawm lub zog ua ntej kuaj xyuas ntxiv.
Lub waveform ntawm AC voltage tej zaum yuav sinusoidal (sine yoj) los yog non-sinusoidal (sawtooth, square, thiab lwm yam). Ntau DMMs tuaj yeem tso saib "rms" (tus nqi zoo) ntawm AC voltage. Tus nqi rms yog tus nqi uas AC voltage sib npaug rau DC voltage.
Ntau lub rooj muaj qhov "nruab nrab teb" ua haujlwm, uas muab cov txiaj ntsig siv tau thaum lub sine nthwv dej ntshiab nkag. Cov ntsuas no tsis tuaj yeem ntsuas tus nqi rms ntawm cov tsis-sinusoidal nthwv dej. DMMs nrog qhov tseeb-rms muaj nuj nqi (true-rms) tuaj yeem ntsuas qhov tseeb-rms tus nqi ntawm cov tsis-sinusoidal nthwv dej.
Lub peev xwm ntawm DMM los ntsuas AC voltage yog txwv los ntawm qhov zaus ntawm lub teeb liab ntsuas. Feem ntau DMMs tuaj yeem ntsuas AC voltages ntawm 50 Hz txog 500 Hz. Txawm li cas los xij, AC ntsuas bandwidth ntawm DMM tuaj yeem ncav cuag ntau pua kilohertz. Rau AC voltage thiab tam sim no, qhov ntau zaus yuav tsum ua raws li DMM specification.
DC voltage ntsuas
①Ntxig cov hlau lead kuaj dub rau hauv COM jack thiab kuaj liab rau hauv V / Ω jack.
② Muab qhov hloov pauv ua haujlwm nyob rau hauv DC qhov hluav taws xob ntau V-ntau, thiab txuas cov kev xeem coj mus rau cov khoom siv hluav taws xob uas yuav tsum tau kuaj (los ntsuas qhov qhib hluav taws xob hluav taws xob) lossis cov khoom thauj (los ntsuas qhov ntsuas hluav taws xob poob). Lub polarity ntawm cov hlau lead liab yuav tshwm rau ntawm cov zaub tib lub sijhawm. superior.
③ Txheeb xyuas qhov kev nyeem ntawv thiab paub meej tias chav tsev
Nco tseg:
①Yog tias koj tsis paub qhov voltage ntau npaum li cas los ntsuas, teeb tsa txoj haujlwm hloov mus rau qhov siab tshaj plaws thiab maj mam txo nws.
②Yog tias cov zaub tsuas pom "1", nws txhais tau tias ntau dhau, thiab qhov hloov pauv yuav tsum tau teem rau ntau dua.
③"" txhais tau tias tsis ntsuas qhov hluav taws xob siab tshaj 1000V, nws muaj peev xwm ua kom pom cov nqi hluav taws xob siab dua, tab sis muaj kev phom sij ntawm kev puas tsuaj rau hauv Circuit Court.
④ Thaum ntsuas qhov hluav taws xob siab, ua tib zoo saib xyuas kom tsis txhob muaj hluav taws xob poob siab.
AC voltage ntsuas
①Ntxig cov hlau lead kuaj dub rau hauv COM jack thiab kuaj liab rau hauv V / Ω jack.
② Muab qhov hloov pauv ua haujlwm nyob rau hauv AC voltage ntau V ~ ntau, thiab txuas tus cwj mem mus rau lub hwj huam mov lossis thauj khoom mus kuaj. Daim duab kos duab sib txuas yog tib yam li saum toj no. Thaum ntsuas AC voltage, tsis muaj polarity zaub.
