... 4.Dual-channel input measuring I. IntroductionDF-200 Double Clamp Digital Phase Meter is special designed for voltage, current and phase tests ... carrying conductor in the nipper jaw, Optional position(6) Amplitude range of measured signal when measuring phase, 100~220V, 0. ... carrying conductor in the nipper jaw, Optional position.(6) Amplitude range of measured signal when measuring phase, Phase U1-U2, ...