User manual

Mathematics
R&S
®
RTO
194User Manual 1316.0827.02 ─ 06
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
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
"Optimized" mode, and for the "Advanced" mode FFT functions |FFT|, FFT (re) and FFT
(im), the magnitude is displayed. For the "Advanced" mode FFT (φ) function, the phase
is displayed.
For magnitude display, you can select the scale and range of magnitudes to be displayed.
For linear scaling, the vertical value range of the input signal is used. For logarithmic
scaling, the logarithmic power of the frequency is displayed. In this case, the input signal
must be given in either Volt or Watt. The resulting value range is defined by a maximum
FFT Analysis