... Dual-channel input measuring I. IntroductionDF-200 Double Clamp Digital Phase Meter is special designed for voltage, current and phase ... , 100~220V, 0.5A~1.5A(7) External reference frequency electromagnetic interference, Should be avoided2. Limits of Intrinsic Error ... U2, 10V~500V, 10mA~10.00A(7) External reference frequency electromagnetic interference, should be avoided2. Limits of Rated Operating ...