Rohde & Schwarz MXO 4 Series - Page 649

Remote control commandsMXO 4 Series
649User Manual 1335.5337.02 ─ 07
CALCulate:SPECtrum<sp>:FREQuency:WINDow:TYPE <WindowFunction>
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 MXO 4 to suit different input sig-
nals. Each of the window functions has specific characteristics, including some advan-
tages and some trade-offs. Consider these characteristics carefully to find the optimum
solution for the measurement task.
Suffix:
<sp>
.
1
Parameters:
<WindowFunction> RECTangular | HAMMing | HANN | BLACkharris | GAUSsian |
FLATTOP2 | FLATtop2 | KAISerbessel
RECTangular
The rectangular window has the best frequency resolution, but a
poor amplitude accuracy and is recommended for separating
two tones with almost equal amplitudes and a small frequency
distance.
HAMMing
The Hamming window is bell shaped and has a good frequency
resolution and fair amplitude accuracy. It is recommended for
frequency response measurements and sine waves, periodic
signals and narrowband noise.
HANN
The Hann window is bell shaped and has a slightly worse fre-
quency resolution but smaller sidelobe level than the Hamming
window. The applications are the same.
BLACkharris
The Blackman window is bell shaped and has a poor frequency
resolution, but very good amplitude accuracy. It is recommended
mainly for signals with single frequencies to detect harmonics.
GAUSsian
Good frequency resolution and best magnitude resolution, rec-
ommended for weak signals and short duration
FLATTOP2 = FLATtop2
The flat top window has a poor frequency resolution, but the
best amplitude accuracy and the sharpest sidelobe. It is recom-
mended for accurate single tone amplitude measurements.
KAISerbessel
The kaiser-bessel window has a fair frequency resolution and
good amplitude accuracy, and a very high sidelobe level. It is
recommended for separating two tones with differing amplitudes
and a small frequency distance.
*RST:
BLACkharris
Usage: Asynchronous command
Spectrum analysis