A 4-channel 100MHz oscilloscope is a tool for observing and measuring electrical waveforms. It displays a graph of voltage over time, with the horizontal axis representing time and the vertical axis representing voltage. Engineers and technicians use oscilloscopes to diagnose, troubleshoot, and analyse electronic circuits.

An oscilloscope with 4 channels refers to its four input channels, which means it can simultaneously measure and display up to four different signals. This is useful for applications where you need to compare or analyse multiple signals at the same time, such as in electronics debugging or circuit analysis.

The 100MHz specification indicates the oscilloscope's bandwidth. Bandwidth refers to the range of frequencies the oscilloscope can accurately capture and display. In this case, it can capture signals with frequencies up to 100 megahertz (MHz). This is a measure of how fast the oscilloscope can accurately capture changes in the signal's voltage over time.

Most oscilloscopes offer a wide range of triggering and measurement options. These features help users to capture specific events or characteristics of a signal, such as pulse width, rise time, and frequency, to name a few.

To use an oscilloscope effectively, you'll typically need suitable probes for connecting to the circuit under test. The oscilloscope should specify its compatibility with certain types of probes, such as passive or active probes, which affect signal integrity and measurement accuracy.