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196
Oscilloscope rise time
The oscilloscope rise time is closely related to its bandwidth. The rise time of an oscilloscope with Gaussian type
frequency response is approximately 0.35/f
BW
(based on the standard from 10% to 90%).
The oscilloscope rise time is not the fastest edge speed that an oscilloscope can accurately measure. It is the fastest
edge speed that the oscilloscope can produce.
Desired oscilloscope bandwidth
The oscilloscope bandwidth required to accurately measure signal is primarily determined by the rise time of the
signal rather than the frequency of the signal.
The following steps can be used to calculate the required oscilloscope bandwidth:
1) Determine the fastest edge speed.
Rise time information is typically obtained from the published device specifications used in the design.
2) Calculate the maximum “actual” frequency component.
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