Oscilloscope

An oscilloscope is a type of electronic test instrument that graphically displays varying voltages of one or more signals as a function of time. Their main purpose is capturing information on electrical signals for debugging, analysis, or characterization. The displayed waveform can then be analyzed for properties such as amplitude, frequency, rise time, time interval, distortion, and others.

Originally, calculation of these values required manually measuring the waveform against the scales built into the screen of the instrument.
Modern digital instruments may calculate and display these properties directly.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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