A common method for performing these
rise/
fall time measurements is to look at a signal on an Oscilloscope, zoom in to the transition edges, put the cursors over the transition edges, and write down the
time delta in a spreadsheet. This method takes about 30 minutes per signal.
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Rise time is the time taken for a signal to cross a specified lower voltage threshold followed by a specified upper voltage threshold. This is an important parameter in both digital and analog systems. In digital systems it describes how long a signal spends in the intermediate state between two valid logic levels.
