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Spectrum analysis
R&S
®
MXO 5 Series
218User Manual 1802.3369.02 ─ 02
10 Spectrum analysis
The R&S MXO 5 provides an easy way to set up a spectrum analysis. The spectrum
settings are independent of the time domain settings but the time and frequency
domains are time-correlated.
10.1 Fundamentals of spectrum analysis
During spectrum analysis, a signal in the time domain is converted to a spectrum of
frequencies. As a result, either the magnitude or the phase of the determined frequen-
cies can be displayed. Spectrum analysis can be restricted to an extract of the original
time base, and the results display can be restricted to a specified frequency range.
t[s]
FFT
f[Hz]
Window functions
Each frame is multiplied with a specific window function after sampling in the time
domain. Windowing helps minimize the discontinuities at the end of the measured sig-
nal interval and thus reduces the effect of spectral leakage, increasing the frequency
resolution.
There are several window functions that can be used in FFT analysis. Each of the win-
dow functions has specific characteristics, including some advantages and some trade-
offs. Consider these characteristics carefully to find the optimum solution for the mea-
surement task.
For details, see "Window type" on page 224.
Gating functions
You can restrict the time base of the input signal for which spectrum analysis is to be
performed. You can define start and stop times for the time base extract.
Fundamentals of spectrum analysis
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