A method of activating a protective measure in a machine comprising vibrating components generating vibrations, the method comprising: obtaining a vibration signal of said vibrations at frequencies spanning at least two adjacent frequency bandwidths amongst a low frequency bandwidth, an intermediate frequency bandwidth, adjacent to the low frequency bandwidth, and a high frequency bandwidth, adjacent to the intermediate frequency bandwidth, characterized in that the method further comprises the steps of: effecting a bandwidth-dependent transfer function on said vibration signal and producing an output in which, independently of original units of the vibration signal, the corresponding at least two of vibrations spanning the low frequency bandwidth are represented in units of displacement amplitude, vibrations spanning the intermediate frequency bandwidth are represented in units of velocity amplitude, and vibrations spanning the high frequency bandwidth are represented in units of acceleration amplitude; using the output, comparing the corresponding at least two of displacement amplitude unit representation across the low frequency bandwidth to a constant displacement amplitude value across the low frequency bandwidth; velocity amplitude unit representation across the intermediate frequency bandwidth to a constant velocity amplitude value across the intermediate frequency bandwidth; and acceleration amplitude unit representation across the high frequency bandwidth to a constant acceleration amplitude value across the high frequency bandwidth; wherein said corresponding at least two of constant acceleration amplitude value, constant velocity amplitude value, and constant acceleration amplitude value are associated to a same vibration severity level; and activating the protective measure upon determining from said comparison that said vibrations at least reach said vibration severity level at any frequency within said corresponding bandwidths. obtaining a vibration signal of said vibrations at frequencies spanning at least two adjacent frequency bandwidths amongst a low frequency bandwidth, an intermediate frequency bandwidth, adjacent to the low frequency bandwidth, and a high frequency bandwidth, adjacent to the intermediate frequency bandwidth, a low frequency bandwidth, an intermediate frequency bandwidth, adjacent to the low frequency bandwidth, and a high frequency bandwidth, adjacent to the intermediate frequency bandwidth, characterized in that the method further comprises the steps of: effecting a bandwidth-dependent transfer function on said vibration signal and producing an output in which, independently of original units of the vibration signal, the corresponding at least two of vibrations spanning the low frequency bandwidth are represented in units of displacement amplitude, vibrations spanning the intermediate frequency bandwidth are represented in units of velocity amplitude, and vibrations spanning the high frequency bandwidth are represented in units of acceleration amplitude; using the output, comparing the corresponding at least two of displacement amplitude unit representation across the low frequency bandwidth to a constant displacement amplitude value across the low frequency bandwidth; velocity amplitude unit representation across the intermediate frequency bandwidth to a constant velocity amplitude value across the intermediate frequency bandwidth; and acceleration amplitude unit representation across the high frequency bandwidth to a constant acceleration amplitude value across the high frequency bandwidth; wherein said corresponding at least two of constant acceleration amplitude value, constant velocity amplitude value, and constant acceleration amplitude value are associated to a same vibration severity level; and effecting a bandwidth-dependent transfer function on said vibration signal and producing an output in which, independently of original units of the vibration signal, the corresponding at least two of vibrations spanning the low frequency bandwidth are represented in units of displacement amplitude, vibrations spanning the intermediate frequency bandwidth are represented in units of velocity amplitude, and vibrations spanning the high frequency bandwidth are represented in units of acceleration amplitude; and producing an output in which, independently of original units of the vibration signal, the corresponding at least two of vibrations spanning the low frequency bandwidth are represented in units of displacement amplitude, vibrations spanning the intermediate frequency bandwidth are represented in units of velocity amplitude, and vibrations spanning the high frequency bandwidth are represented in units of acceleration amplitude; using the output, comparing the corresponding at least two of displacement amplitude unit representation across the low frequency bandwidth to a constant displacement amplitude value across the low frequency bandwidth; velocity amplitude unit representation across the intermediate frequency bandwidth to a constant velocity amplitude value across the intermediate frequency bandwidth; and acceleration amplitude unit representation across the high frequency bandwidth to a constant acceleration amplitude value across the high frequency bandwidth; wherein said corresponding at least two of constant acceleration amplitude value, constant velocity amplitude value, and constant acceleration amplitude value are associated to a same vibration severity level; and activating the protective measure upon determining from said comparison that said vibrations at least reach said vibration severity level at any frequency within said corresponding bandwidths.