Power harmonic Alarm It meets the whole requirements of GB/T1459～93 to test the virtual value, and positive ,reverse and zero sequence component of current and voltage Measuring area: content of voltage harmonic, distortion factor of phase-angle and current voltage Virtual value of current harmonics, distortion factor of phase-angle and total voltage harmonics Range of measuring harmonics: fundamental wave -51times harmonics Way of input signals: voltage, current, phase Print: printed three-phase waveforms, statistic of the testing results, automatic printed three-phase results. The key technical indexes: 1．Way and range of input signal A．Three-phase voltage and three-phase current B. voltage test range: 10-240V（or 20-400V） C. current test range: 0.05-6A (or0.1-12A) D. tracking range of fundamental harmonics frequency 2. Input impendence: voltage side≥200kΩ, current side≤20mΩ 3. Measuring accuracy: measuring error of fundamental: ≤0.5% 4. Measuring times of harmonics: 5-51 5. Statistical times：5～96 times are choiceable 6. Timing space of orientation in time：0～999 minutes are choiceable 7. setting range of continuous limited number：0～999 8. time of equipments’ power supply source：220V±15%；50Hz±5%；THDu±≤8.0%; 20VA
