3 Spectrum Analyzer Mode
3.4 Occupied BW Measurement
3.4.4 BW
Opens the Bandwidth (BW) menu, which contains controls for "Res BW" on page
770 and "Video BW" on page 771.
The Resolution BW functions control filter bandwidth and filter type. There are two
filter types, Gaussian and Flattop. The Gaussian filters have a response curve that is
parabolic on a log scale. The Flattop filter shape is a close approximation of a
rectangular filter.
3.4.4.1 Settings
Contains the basic bandwidth functions. In this measurement, it is the only tab
under BW.
Res BW
Activates the resolution bandwidth active function, which allows you to manually set
the resolution bandwidth (RBW) of the instrument.
Normally, Res BW (Auto) selects automatic coupling of the Res BW to "Span" on
page 788 using the ratio set by Span:3dB RBW (some measurements do not have a
Span:3dB RBW control, in which case the measurement chooses the optimal ratio).
To decouple the resolution bandwidth, press the Auto/Man toggle on the Res BW
control, or simply enter a different value for Res BW.
When the Res BW is manually selected, it may be returned to the coupled state by
pressing the Auto/Man toggle on the Res BW control. This may also be done by
pressing "Auto Couple" on page 2017 or by performing a Preset.
When Res BW is set to Auto, the bandwidth selected depends on "RBW Filter Type"
on page 773.
Only certain discrete resolution bandwidths are available. The available bandwidths
are dependent on Filter Type or EMC Standard. If an unavailable bandwidth is
entered with the numeric keypad, the closest available bandwidth is selected.
Remote
Command
[:SENSe]:OBWidth:BANDwidth[:RESolution] <bandwidth>
[:SENSe]:OBWidth:BANDwidth[:RESolution]?
[:SENSe]:OBWidth:BANDwidth[:RESolution]:AUTO ON | OFF | 1 | 0
[:SENSe]:OBWidth:BANDwidth[:RESolution]:AUTO?
Example
:OBW:BAND 5 MHz
:OBW:BAND?
:OBW:BAND:AUTO ON
770 Spectrum Analyzer Mode User's &Programmer's Reference
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