Spectrum Analyzer

This figure displays the main program window when operating in the spectrum analyzer mode. Most part of window elements when operating in this mode is similar to the corresponding elements when operating in the oscilloscope mode. Exception is that the horizontal axis is set as the frequency axis; time base is set as frequency/screen and the voltage scale is negative amplitude-free.

New elements relating exceptionally to the spectrum analysis were added. So, on the panels "Channel A/B (Volt/Screen)" the additional "V / dB" and "0 dB = 0.775 V/0 dB = Umax" and buttons were appeared. The first button determines the units to express the vertical scale: in Volts or dB. The second button (it is active only if the first one is pressed) determines what voltage level corresponds to 0 dB: 0.775 V or maximum voltage value along the whole frequency axis for the set channel.

On the panel "Frequency" the button is added that determines whether frequency axis is linear or logarithmic.

Triggering panel is changed to the FFT window function settings panel . On the panel there is a dropdown list containing some common window functions: Hamming, Hanning, Blackman, Blackman-Harris.

Panel for calculation of nonlinear distortion factor or harmonic distortion factor (HDF) was also added. On the panel you can view the results of general calculation of HDF, HDF of harmonic thirds and frequency of the first (main) harmonic, which can be forced in the field F1 or calculated automatically when ticking the flag [+] Max.