DMM ning eng asosiy funktsiyalaridan biri kuchlanishni o'lchashdir. Voltajni sinab ko'rish, odatda, kontaktlarning zanglashiga olib keladigan muammolarni bartaraf etishda birinchi qadamdir. Agar kuchlanish bo'lmasa yoki kuchlanish juda past yoki juda baland bo'lsa, birinchi narsa, keyingi tekshirishdan oldin quvvat muammosini hal qilishdir.
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.
DMM ning AC kuchlanishini o'lchash qobiliyati o'lchanadigan signalning chastotasi bilan cheklangan. Aksariyat DMMlar 50 Gts dan 500 Gts gacha bo'lgan AC kuchlanishlarini aniq o'lchashlari mumkin. Biroq, DMM ning o'zgaruvchan tokni o'lchash tarmoqli kengligi yuzlab kilogertsga yetishi mumkin. AC kuchlanish va oqim uchun chastota diapazoni DMM spetsifikatsiyasiga mos kelishi kerak.
GVDA Digital Clamp meter GD118B:
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