Spectrum analysis
R&S
®
RTP
404User Manual 1337.9952.02 ─ 12
t[s]
Gate
Gate position
Gate length
f[Hz]
FFT
Center frequency
Frequency span
Restricting the result range
You can restrict the results of the FFT analysis to a specified frequency range. The fre-
quency range can be defined in two ways:
●
Define a center frequency and frequency span
●
Define start and stop frequencies
Using the new cursor functions for spectrum waveforms you can easily determine the
results for the current center frequency by moving the cursor to that frequency ("C1 to
Center"). If you detect a point of interest in the spectrum diagram, you can place the
cursor on it and then move the center frequency to the position of the cursor automati-
cally ("Center to C1").
See Chapter 8.1, "Cursor measurements", on page 319.
Magnitude vs. phase display
The result of an FFT analysis is a spectrum of frequencies. Either the magnitudes or
the phases of those frequencies are displayed, depending on the used FFT function. In
"Basic" mode, and for the "Advanced" mode FFT functions |FFT|, FFT (re) and FFT
FFT analysis
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