Typically, the systems under analysis are either complex or partially unknown, and the analytical methods become inadequate. In these cases, the most used approach is the impedance-based analysis, which often relies on practical impedance measurements of the subsystems. The impedance measurements generally require a perturbation signal to be injected to the system, which can be either voltage- or current-type, and the resulting currents and voltages are measured. Then Fourier transform is applied to extract the spectral information (impedance) from the measured signals. Multiple different perturbation signals have been discussed, such as sine sweep, multi-sine sweep, impulse response, or broadband sequences
Typically, the systems under analysis are either complex or partially unknown, and the analytical methods become inadequate. In these cases, the most used approach is the impedance-based analysis, which often relies on practical impedance measurements of the subsystems. The impedance measurements generally require a perturbation signal to be injected to the system, which can be either voltage- or current-type, and the resulting currents and voltages are measured. Then Fourier transform is applied to extract the spectral information (impedance) from the measured signals. Multiple different perturbation signals have been discussed, such as sine sweep, multi-sine sweep, impulse response, or broadband sequences<br>
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