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Definition of Rise time

Rise time Definition from Science & Technology Dictionaries & Glossaries
Telecommunication Standard Terms
In the approximation of a step function, the time required for a signal to change from a specified low value to a specified high value. Typically, these values are 10% and 90% of the step height. (188 )
Technical English by wpv
The time required for a sensor or system to respond to an instantaneous step function, measured from the 10% to 90% points on the response waveforms.
Fiber Optics, Optical Networking Terms
The time taken to make a transition from one state to another, usually measured between the 10% and 90% completion points of the transition. Alternatively the rise time may be specified at the 20% and 80% amplitudes. Shorter or faster rise times require more bandwidth in a transmission channel.
Rise time Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
In electronics, when describing a voltage or current step function, rise time is the time taken by a signal to change from a specified low value to a specified high value. These values may be expressed as ratios or, equivalently, as percentages respect to a given reference value. In analog or digital electronics, these percentages are commonly the 10 nd 90% (or equivalently and ) of the output step height: however, other values are commonly used. For applications in control theory, according to , rise time is defined as "the time required for the response to rise from to of its final value", with 0% to 100% rise time common for underdamped second order systems, 5% to 95 or critically damped and 10% to 90 or overdamped ones. According to , the term "rise time" applies to either positive or negative step response, even if a displayed negative excursion is popularly termed fall time.

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