What does the horizontal axis of a spectrum analyzer display?

The horizontal axis of a spectrum analyzer displays frequency. This is key in understanding how spectrum analyzers work, as they are designed to show the different frequencies present in a signal and their respective amplitudes. The frequency is represented in hertz (Hz), and as you move along the horizontal axis, you're observing how the signal's characteristics change at different frequency values.

This visual representation allows engineers and technicians to analyze the frequency content of signals, identify sources of interference, and ensure compliance with regulations, among other tasks. The vertical axis, on the other hand, typically represents amplitude or power level, demonstrating the strength of the signals at each frequency point.