The relays PR122 and PR123 include a new function named `data logger`: in a dedicated memory area are stored the current and voltages signals of the electrical plant. this function will be useful for plant's analysis and a rapid detection of operational defects. Through SD-Test bus and SD-Pocket software it is possible to transfer the entire content of the data logger forming relay memory to a file; you can manage this file afterwards.
The SD-Data Viewer opens this file and represents the current and the voltage's signals as graphics in time and frequency domain. Through the markers, it is also possible to give more precisely measurements in a similar way that oscilloscope does. It permits the harmonic's spectrum calculation too.
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