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One presents a complex data acquisition structure used for the monitoring and diagnosis of a system used for electric power transmission in the zone of large power source. The structure is also used for the optimization of power network operation in order to use the network also for the transmission of electric signals other than those of 50 Hz. The schematic of the monitored system is presented, the test points are specified. The tests are performed with three independent synchronized data acquisition systems that can acquire up to 24 electrical quantities. The hardware and software solutions are described. Examples of using the presented solutions to record some electric quantities are provided. Real time information are obtained using the data acquisition structure along with the software packages dedicated to the data analysis and processing. At the end waveforms recorded in various points of the power group are provided.