Analyzer - Bandwidths and Sweep Time R&S ESCI
1166.6004.12 4.86 E-1
SPAN /RBW
MANUAL
The SPAN/RBW MANUAL softkey activates the manual input of
the coupling ratio.
The span / resolution bandwidth ratio can be set in the range
1 to 10000.
IEC/IEEE-bus command BAND:RAT 0.1
This setting is only effective for the RBW AUTO selection in the
main menu.
DEFAULT
COUPLING
The DEFAULT COUPLING softkey sets all coupled functions to the default state
(AUTO). In addition, the ratio RBW/VBW is set to SINE [1/3] and the ratio
SPAN/RBW to 50 in the COUPLING RATIO submenu (default setting, COUPLING
RATIO softkey not highlighted).
IEC/IEEE-bus command BAND:AUTO ON
BAND:VID:AUTO ON
SWE:TIME:AUTO ON
FILTER
TYPE
The FILTER TYPE softkey opens the selection list for different filter types. In the
range up to 30 kHz digital band filters with Gaussian characteristic and filtering with
FFT algorithm can be selected.
FILTER TYPE
NORMAL (3dB)
NORMAL (6dB)
FFT
CHANNEL
RRC
NORMAL(3dB)
The resolution bandwidths are implemented by Gaussian filters with the
set 3 dB bandwidth and correspond approximately to the noise
bandwidth. For bandwidths up to 100 kHz, digital bandpass filters are
used. NORMAL(6dB)
The resolution bandwidths are implemented by Gaussian filters with the
set 6 dB bandwidth and correspond approximately to the pulse
bandwidth. For bandwidths up to 120 kHz, digital bandpass filters are
used
FFT An FFT is performed. For that purpose, the filtered IF signal is digitized
and then transformed into the spectral domain via FFT. The
transformation range depends on the selected filter bandwidths and can
be set between 4 kHz to 50 kHz. If the span is larger than the
transformation range, several transformations are performed and the
results are appended to each other in the spectral domain.
If the span is smaller than the transformation range, the measurement
results are interpolated when the number of measurement points
provided by the FFT is smaller than the number of display points in x-
direction (501). A flattop window serves as a window in the time domain
so that high amplitude precision with good selection is achieved.
If the span is smaller than the transformation range, the measurement
results are interpolated when the number of measurement points
provided by the FFT is smaller than the number of display points in x-
direction (501). A flattop window serves as a window in the time domain
so that high amplitude precision with good selection is achieved.
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