Settling time
The settling time , engl. attack time ( rise time, settling time ) is the time interval required for a settling process .
When switching on an alternating oscillation , the steady state, the forced oscillation , only occurs after a certain time has elapsed. Even after every change in excitation, there is always a balancing process (transition process), i. H. a transitional oscillation or temporary free oscillation. In the case of linear oscillators such as filters , transmission elements , rooms, etc., the transient process can consist of the free and the forced oscillation.
Theoretically, the settling process is never finished. In practice, however, it is customary to consider the settling time to have ended when the signal size does not exceed its final value by more than ± 10% of the difference between the initial and final value; this period is then also called the settling time .
The transient process does not always have to start with a maximum change. Especially in pulses that only a relatively short time their maximum value hold ( transients ), we speak of a rise time ( rise time ) between reaching 10% and 90% of the maximum value of the rising edge passes:
Accordingly applies to the fall time ( fall time ) that elapses between the achievement of 90% and 10% of the maximum value of the falling edge:
literature
- W. Reichardt: Fundamentals of technical acoustics. Academic publishing company Geest and Portig, Leipzig 1968
- Jan Lunze: Control engineering 1 . 9th edition. Springer Vieweg, Heidelberg 2013, ISBN 978-3-642-29533-1 , p. 738 .