Youn nan fonksyon ki pi fondamantal nan yon DMM se mezire vòltaj. Tès vòltaj la se nòmalman premye etap la nan depanaj yon pwoblèm sikwi. Si pa gen okenn vòltaj oswa si vòltaj la twò ba oswa twò wo, premye bagay ou dwe fè se ranje pwoblèm nan pouvwa anvan tcheke pi lwen.
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.
Kapasite yon DMM pou mezire vòltaj AC limite pa frekans siyal yo mezire. Pifò DMM ka mezire avèk presizyon AC vòltaj soti nan 50 Hz a 500 Hz. Sepandan, lajè mezi AC DMM a ka rive jwenn dè santèn de kilohertz. Pou vòltaj AC ak aktyèl, ranje frekans lan ta dwe konsistan avèk spesifikasyon DMM la.
GVDA Digital Clamp meter GD118B:
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