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Operating Manual 1164.4556.12 - 06
4.19
R&S FSP
Instrument Functions
Analyzer Mode
Bandwidths above 100 kHz are realized using decoupled 4-circuit LC filters.
As an alternative to the analog filters, FFT filters are available for the bandwidths
between 1 Hz and 30 kHz. When working with bandwidths up to 30 kHz, the FFT
algorithm offers considerably higher measurement speeds with all the other settings
remaining the same. The reason is that with analog filters the sweep time required
for a particular span is proportional to (Span/RBW
2
). When using the FFT algorithm,
however, the sweep time is proportional to (Span/RBW).
The video bandwidths are available in 1, 3, 10 steps between 1 Hz and 10 MHz.
They can be set in accordance with the resolution bandwidth.
The video filters serve for smoothing the displayed trace. Video bandwidths that are
small compared to the resolution bandwidth average out noise peaks and pulsed
signals, so that only the signal average is displayed. If pulsed signals are to be mea-
sured, it is recommended to use a video bandwidth that is large compared to the
resolution bandwidth (VBW
≥
10 × RBW) for the amplitudes of pulses to be mea-
sured correctly.
BW
The
BW
key opens a menu for setting the resolution bandwidth, the video bandwidth,
the sweep time and their couplings.
The
…BW AUTO
softkeys are used to couple the functions. The coupling ratios are
selected by means of the
COUPLING RATIO
softkey.
For analog and digital filters, the R&S FSP has overload reserves of different mag-
nitude above the reference level. Due to the LO breakthrough the overload display
OVLD responds with digital filters with RBW < 100 kHz, as soon as the start fre-
quency is selected < 6 × RBW; for RBW = 100 kHz as soon as the start frequency
is below 3 MHz.
!
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Summary of Contents for R&S FSP Series
Page 1: ...R S FSP Spectrum Analyzer Operating Manual 1164 4556 12 06 Test Measurement Operating Manual ...
Page 24: ...R S FSP Putting into Operation 1 2 Operating Manual 1164 4556 12 06 ...
Page 72: ...R S FSP Manual Operation 3 2 Operating Manual 1164 4556 12 06 ...
Page 793: ...R S FSP Index Operating Manual 1164 4556 12 06 4 11 ...
Page 794: ...R S FSP 4 12 Operating Manual 1164 4556 12 06 ...
Page 795: ...Operating Manual 1164 4556 12 06 4 13 R S FSP ...
Page 796: ...R S FSP 4 14 Operating Manual 1164 4556 12 06 ...