Common Measurement Settings
R&S
®
FSW
413User Manual 1173.9411.02 ─ 19
For spectrogram displays, the sweep count determines how many sweeps are com-
bined in one frame in the spectrogram, i.e. how many sweeps the R&S FSW performs
to plot one trace in the spectrogram result display. For more details see "Time Frames"
on page 459.
Remote command:
[SENSe:]SWEep:COUNt on page 840
[SENSe:]AVERage:COUNt on page 911
Sweep Points
Defines the number of measured values to be collected during one sweep.
For details see chapter 6.5.1.8, "How Much Data is Measured: Sweep Points and
Sweep Count", on page 407.
All values from 101 to 100001 can be set. The default value is 1001 sweep points.
For EMI measurements, 200001 sweep points are available.
Remote command:
[SENSe:]SWEep:POINts on page 841
Optimization
In FFT mode, several FFT analysis steps are required to cover the entire measurement
span. The span which is covered by one FFT analysis step is called partial span. The
partial span cannot be defined directly, but it can be optimized according to measure-
ment requirements.
Table 6-2: Optimization parameters in FFT mode
Optimization mode Description
Dynamic Optimizes the dynamic range by using the narrowest possible partial span (depend-
ing on the RBW).
The autorange function for the internal IF gain calculation is activated to obtain the
best control range for the A/D converter.
Speed Optimizes the sweep rate by using the widest possible partial span (depending on
the RBW).
The autorange function for the internal IF gain calculation is deactivated. (Note: set
the reference level accordingly to optimize the control range for the A/D converter).
It is recommended that you set the Sweep Time to "Auto" to optimize the sweep
rate.
Auto Uses a medium-sized partial span to obtain a compromise between a large dynamic
range and a fast sweep rate.
The autorange function for the internal IF gain calculation is activated to obtain the
best control range for the A/D converter.
Note: FFT mode and external mixers (R&S FSW-B21)
The partial span optimization modes "Dynamic" and "Auto" include automatic suppres-
sion of unwanted mixing products. Thus, when using external mixers (R&S FSW-B21),
use the "Speed" mode to obtain similar results in FFT mode as in frequency sweep
mode.
Zero span mode
Bandwidth, Filter and Sweep Configuration
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