... 4 Current Sensing Clamps. 1P2W, 1P3W, 3P3W2M & 3P4W Power Measurement. True RMS Sensing. Power KW, KVAR, KVA, PF, θ ,Hz, & Energy ... Points and Start / Stop Time. RS-232 Optical Interface with three phase voltage / current Waveform display and Harmonic analysis. Easy ... 0.5%rdg ± 10dgts + clamp on sensor specifications Active Power Measurement (KW)Ranges Accuracy Effect of power factor 600.0KW± 0.5%rdg ...