An oscilloscope, also known as a scope or CRO (cathode-ray oscilloscope, formerly), is a type of electronic test instrument that graphically displays varying signal voltages, usually as a two-dimensional plot of one or more signals as a function of time. Other signals (such as sound or vibration) can be converted to voltages and displayed. Oscilloscopes are used to observe the change of an electrical signal over time, and are commonly used in engineering, physics, and telecommunications to analyze waveforms, measure frequency and amplitude, and diagnose circuit problems.
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