What does the vertical axis of a spectrum analyzer display?

The vertical axis of a spectrum analyzer displays amplitude, which is a critical aspect of understanding the characteristics of a signal. Amplitude represents the strength or power level of the signal being analyzed at various frequencies. This measurement is typically expressed in units such as decibels (dB) relative to a reference level.

By observing the amplitude on the vertical axis, users can assess how strong a particular frequency component is within the overall signal. Higher peaks on the spectrum indicate stronger signals at those specific frequencies, which can help in identifying interference, analyzing signal quality, or determining compliance with communication standards.

Understanding amplitude is vital for engineers and technicians who need to diagnose issues with transmission systems, evaluate the performance of signal processing equipment, or ensure that the signals being transmitted meet regulatory requirements. This detailed analysis is core to the effective use of a spectrum analyzer.