For ease of use, the HDO oscilloscopes may be loaded with optional spectrum-analysis software. The software provides a spectrum-analyzer style interface for easy viewing and measurement in the frequency domain. Users can quickly make adjustments to center frequency, frequency span, and resolution bandwidth, just as with a traditional spectrum analyzer. The software automatically finds and labels peaks in the spectrum. Markers denote frequency and magnitude measurements across the entire spectrum. An interactive table facilitates quick navigation between peaks as well as measurement between markers. Also, a spectrogram display illustrates how the spectrum changes over time.