Atec Tektronix-RSA3000B - Manual (Page 3)

Spectrum Analyzers — RSA3000B Series
Unlike a conventional VSA’s capability of quantifying the modulation quality only at the
center frequency, the RSA3000B Series can demodulate a captured off-center hopped
signal with view of the spectrogram (upper left), frequency versus amplitude (upper right),
signal modulation quality (lower left) and Constellation (lower right).
The RSA3000B Series also provides automatic measurement of the frequency settling
time with the built-in Modulation Domain analyzer.
A Frequency Mask Trigger (FMT) was set to monitor the frequency domain for any
changes in the spectrum, and it triggered on transient interference. The spectrogram
(lower display) shows the time relationship between the desired good signal and the
interfering transient signal. The spectrum display shows what was happening at the
precise moment the interfering signal was present in the band. FMT is an essential tool for
capturing interfering and unauthorized signals in the presence of desired emitters.
The Audio Spectrum and Spectrogram allow designers to understand the nature of
distortion by viewing harmonics and nonharmonic components over time. Distortion
parameters are calculated for each FFT frame in the Spectrogram display.
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