Which type of oscilloscope input can accept two independent signals at the same time?

A dual channel input oscilloscope is designed to handle two independent signals simultaneously. This feature allows the user to compare, analyze, or visualize the interaction between the two signals directly on the oscilloscope screen. By having two channels, it facilitates tasks such as differential measurement, where the relationship between the two signals can be closely observed, which is essential in many applications in electronics, engineering, and signal processing.

Single channel inputs, in contrast, can only measure one signal at a time, which limits the ability to analyze multiple signals together. Digital and analog inputs refer more broadly to the types of signals being measured rather than the number of signals an oscilloscope can handle at once. Thus, when comparing various types of inputs, the dual channel input clearly stands out as the choice that accommodates two independent signals simultaneously.