The three-phase network analysis system SIEMOS PQ is the ideal tool for the daily discovery and analysis of power quality problems in electrical networks. It meets the specifications of IEC 61000-4-30, class A, regarding the demands on a modern and flexibly utilizable measuring system. This means that the SIEMOS PQ network analysis system permits advanced analyses for all kinds of structured power distribution systems and consistent testing of standards.With the help of the SIEMOS PQ network analysis system, the power quality of medium and low-voltage power distribution systems of both industry and those power providers using such networks can be analyzed and evaluated based on the three-phase measurement of the relevant network parameters. SIEMOS PQ can acquire up to 1750 different system values (e.g., voltage, current, frequency, power, voltage unbalances, flicker, harmonics and intermediate harmonics) in one continuous recording. Based on the particular measuring task, any measuring interval between 1 second and up to 30 minutes can be selected without restriction of the number of parameters to be analyzed. In addition, threshold and limit values, evaluation algorithms and measuring functions can be flexibly adjusted to the particular evaluation task.