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Sweep/Control
Best Dynamic Range
This selection tells the analyzer to choose between swept and FFT analysis with the primary goal of
optimizing dynamic range. If the dynamic range is very close between swept and FFT, then it chooses
the faster one. This auto selection also depends on RBW Type.
In determining the Swept or FFT setting, the auto rules use the following approach:
• If the RBW Filter Type is Gaussian use the RBW for the Normal Filter BW and if that RBW > 210
Hz, use swept; for RBW <= 210 Hz, use FFT
• If the RBW Filter Type is Flat Top, use the same algorithm but use 420 Hz instead of 210 Hz for the
transition point between Swept and FFT
• If any of the CISPR detectors is chosen for any active trace, always use Swept.
Best Speed
This selection tells the analyzer to choose between FFT or swept analysis based on the fastest analyzer
speed.
FFT Width
This menudisplays and controls the width of the FFT’s performed while in FFT mode. The “FFT width”
is the range of frequencies being looked at by the FFT, sometimes referred to as the “chunk width” -- it is
not the resolution bandwidth used when performing the FFT.
It is important to understand that this function does not directly set the FFT width, it sets the limit on the
FFT Width. The actual FFT width used is determined by several other factors including the Span you
have set. Usually the instrument picks the optimal FFT Width based on the current setup; but on
Preset: ON
State Saved: Saved in instrument state
Initial S/W Revision: Prior to A.02.00
Key Path:
Sweep/Control, Sweep Setup, Sweep Type Rules
Example: SWE:TYPE:AUTO:RUL DRAN sets the auto rules to dynamic range.
Couplings: Directly selecting this setting sets AUTO to OFF.
Readback: Dynamic Range
Initial S/W Revision: Prior to A.02.00
Key Path:
Sweep/Control, Sweep Setup, Sweep Type Rules
Example: SWE:TYPE:AUTO:RUL SPE sets the rules for the auto mode to speed
Couplings: Directly selecting this setting sets AUTO to OFF.
Readback: Speed.
Initial S/W Revision: Prior to A.02.00