DEVICE AND PROCESS FOR EXAMINING THE SIGNALS OF SYSTEMS RELEASING THEM DURING OPERATION OR IN RESPONSE TO EXTERNAL EXCITATION

摘要

The object of the invention is a measuring device (1) for measuring and evaluating the signal of a system releasing a measurable signal during operation or on the effect of external excitation, which device contains a signal receiving unit (2) and an output unit (5,6) . It also contains an evaluating unit (3,4) adapted for performing Fourier transform on the time dependant signal captured by the receiving unit, for calculating the power density function of the Fourier transform, for fitting a power function having a exponent on the power density function, and for transmitting the obtained a exponent to the output device.