Which device is used to display the output waveform of a wave generating circuit?

An oscilloscope is the device used to display the output waveform of a wave generating circuit. This instrument is specifically designed to visualize electrical signals as waveforms over time, allowing technicians to observe the shape, frequency, amplitude, and other characteristics of the waveform.

Unlike voltmeters and multimeters, which primarily measure voltage and other electrical parameters without providing a visual representation, the oscilloscope offers an interactive and dynamic display that shows how the signal varies continuously. This makes it invaluable for diagnosing issues in waveforms, such as distortion or frequency changes.

A signal generator, while important in creating waveforms for testing and analysis, does not display the output waveform itself; it simply produces the signal that can then be viewed with an oscilloscope. Thus, the oscilloscope is the key instrument for directly observing and analyzing the output of wave generating circuits.