Ib qho ntawm cov haujlwm tseem ceeb tshaj plaws ntawm DMM yog ntsuas qhov voltage. Kev ntsuas qhov hluav taws xob 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.
The waveform of the AC voltage may be sinusoidal (sine wave) or non-sinusoidal (sawtooth, square, etc.). Many DMMs can display the "rms" (effective value) of AC voltage. The rms value is the value at which the AC voltage is equivalent to the DC voltage.
Many tables have an "average responding" function, which gives valid values when a pure sine wave is input. Such meters cannot accurately measure the rms value of non-sinusoidal waves. DMMs with true-rms function (true-rms) can accurately measure the true-rms value of non-sinusoidal waves.
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.
GVDA Digital Clamp meter GD118B:
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