the final step response value. Similarly, fall time is defined as the time interval between the
first 90% point and the first 10% point in the step response of a system where the response
variable is such that it starts at a non-zero initial value and decays to zero value in the long
run. The percentages are to the base of the initial response value in this case.
These two definitions are illustrated in the case of a series RL circuit step response
in Fig. 10.5-3. Normalised variables are used in this figure and the corresponding normalised
time points at which the 10% and 90% crossover takes place are also marked in the figure.
From the figure, it ...
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