Red Pitaya HAMlab User Manual page 61

smartphone, tablet or a PC running any popular operating system (MAC, Linux, Windows, Android, and iOS). The
elements on the DFT Spectrum analyzer application are arranged logically and offer a familiar user interface.
The graphical interface is divided into 4 main areas:
• Run/Stop and Export button: The "Run/Stop" button is used to start and stop measurements. With
the "Export" button you can select in which format you want to download the measured data (plotted
spectrum). Two formats are available: .png and .csv.
• Inputs / Cursors / Range / Axis control panel: This menu provides controls for inputs, cursors, and
frequency range settings. Horizontal +/- buttons are used to select the span of the X (frequency) axis
(zooming in/out). The vertical +/- buttons change the Y (amplitude)-axis range.
• Graph area: Here, the currently calculated signal spectrum is plotted in the selected frequency
range.
• Waterfall plots: Waterfall plots are a different way of the signal spectrum representation where the
color on the plot defines the signal amplitude for a certain frequency. The waterfall plot is also useful
to enable the representation of a signal spectrum in a time dependency.
Features
The main features of the DFT Spectrum analyzer are described below:
INPUTS
Inputs controls are shown in the picture below. With the "SHOW" select button displaying the spectrum
of the selected input can be enabled or disabled. The "FREEZE" button is used for stopping the measure-
ments of the selected input. The "MIN" and "MAX" select buttons are used to enable/disable the persist
mode for the spectrum plot. The "MIN" signal spectrum plot will show the lowest values of the signal
spectrum taken after enabling the "MIN" button. The same logic is used for the "MAX" signal where the
MAX values of the signal spectrum are shown. This feature is mostly used for detecting signal glitches
and the max/min spectrum amplitude values during the measurement.
3.2. Spectrum Analyzer
HAMlab, Release 1.0
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