2.4.3 Transient System Specifications
In many cases the desired, or prescribed, system characteristics are specified in terms of time response. Time-domain specifications are customarily defined in terms of unit step function. Þpical transient performance specifications are:
1. Overshoot—the maximum difference between the transient and steady-state response for a unit step function input (fig. 2.12).
2. Delay time—the time required for the response to a unit step function input to reach 50% of its final value (Fig. 2,13).
3. Rise time—the time required for the response to a unit step function input to rise from 10% to 90 0/0 of its final value (Fig. 2.13).
4. Settling time—the time required for the response to a unit step function input to reach and remain within a specified percentage (frequently 2% or 5%) of its final value (Fig. 2.12).