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This power quality analyzer provides a solution, with an innovative approach, to meet the needs of professional technical departments and testers regarding measuring and recording generic single-phase and three-phase electric mains parameters, which further solve typical problems of the industrial sector (mains quality, power supply switching, PC network faults, non-linear circuit analysis, system correction, motor starting, etc.). This instrument is provided with a wide TFT graphic color display (320 x 240 pixels) with a touch screen. The user interface has identification icons, which provide a simple and intuitive selection method of internal parameters. The instrument allows displaying the parameters in multiple numeric and graphic modes for an easy harmonic analysis. The graphic function Vector Diagram also allows immediate evaluation of the reciprocal phase displacement between the input voltage and current signals, thus defining the nature of loads. The high-capacity internal memory of each model, approx. 15MB, allows saving data of all recordings for a high number of consecutive days (approx. 1 month with 251 pieces selected and integration period of 15 minutes), but the memory of each instrument is extensible, at all times, by inserting external compact Flash memories and also by transferring data onto USB memory sticks for a practical management of the saved data.