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Spectrum analysis
R&S
®
MXO 4 Series
233User Manual 1335.5337.02 ─ 05
RBW
Defines the resolution bandwidth. Note that the resolution bandwidth is correlated with
the span, record length and acquisition time. If a constant record length is to be used,
the RBW can be adapted if the required number of samples cannot be acquired.
Remote command:
CALCulate:SPECtrum<sp>:FREQuency:BANDwidth[:RESolution][:VALue]
on page 559
Window type
Selects the window type. Windowing helps minimize the discontinuities at the end of
the measured signal interval and thus reduces the effect of spectral leakage, increas-
ing the frequency resolution.
Various different window functions are provided in the R&S MXO 4 to suit different
input signals. Each of the window functions has specific characteristics, including some
advantages and some trade-offs. Consider these characteristics carefully, to find the
optimum solution for the measurement task.
Window type Frequency
resolution
Magnitude
resolution
Measurement recommendation
Rectangular Best Worst Separation of two tones with almost equal amplitudes
and a small frequency distance
Hamming
Hann
Good Poor Frequency response measurements, sine waves, peri-
odic signals and narrow-band noise
Blackman Harris
(default)
Worst Best Mainly for signals with single frequencies to detect har-
monics
Accurate single-tone measurements
Gaussian Good Good Weak signals and short duration
Flattop2 Poor Best Accurate single-tone measurements
Kaiser Bessel Poor Good Separation of two tones with differing amplitudes and a
small frequency distance
Remote command:
CALCulate:SPECtrum<sp>:FREQuency:WINDow:TYPE on page 561
Traces
Spectrum analysis can only be performed on a maximum number of values at once. If
more values must be calculated, the input signal is divided into segments, each of
which is calculated separately. The segments need not to be disjunct. In this case, the
arithmetic mode defines how the final result is calculated from the individual results.
The following methods are available:
"Norm"
The data of only one segment is considered. In effect, no arithmetics
are processed.
"Min hold"
Determines the minimum result for each input value from the data of
the current acquisition and the acquisitions before.
"Max hold"
Determines the maximum result for each input value from the data of
the current acquisition and the acquisitions before.
Spectrum setup
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