An oscilloscope, also known as a scope or DSO (digital storage oscilloscope), is a type of electronic test instrument that allows observation of constantly varying signal voltages, usually as a two-dimensional graph of one or more electrical potential differences using the vertical or y-axis, plotted as a function of time along the horizontal or x-axis. https://hallbook.com.br/blogs/433125/The-Evolution-of-Oscilloscopes-From-Analog-CRT-to-Digital-LCD