Using the spectrum analyzer

FFT A signal can contain multiple frequencies that are not visible in an oscilloscope. This video will demonstrate the use of a spectrum analyzer to reveal signals that are invisible in the oscilloscope.

Using the spectrum analyzer quick function creates a spectrum analyzer in just one single click. The frequency spectrum of the measured signal is displayed in a new graph.

By increasing the recordlength, the frequency resolution of the spectrum is increased. This results in a much more accurate spectrum. Zooming in will now give a better view on the individual frequency components.

When the captured signal does not contain a whole number of periods, spectral leakage occurs. To minimize its effect, we let the FFT I/O apply a window to the measurement. The Blackman-Harris window will mostly give the best results.

Frequencies that are hidden in the oscilloscope, become clearly visible in the spectrum analyzer.