3 Spectrum Analyzer Mode
3.3 Channel Power Measurement
3.3.4 BW
Opens the Bandwidth (BW) menu, which contains controls for the Resolution
Bandwidth and Video Bandwidth functions of the instrument.
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.
3.3.4.1 Settings
Contains the basic bandwidth functions. In most measurements it is the only tab
under Bandwidth.
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 Res BW to "Span" on page
627, using the ratio set by Span:3 dB RBW (some measurements do not have a
Span:3 dB RBW control, in which case the measurement chooses the optimal ratio).
To decouple the resolution bandwidth, press the Auto/Man toggle on Res BW, or
simply enter a different value for Res BW.
When Res BW is manually selected, you can return it to the coupled state by
pressing the Auto/Man toggle on Res BW. This may also be done by pressing "Auto
Couple" on page 2017 or by performing a Preset.
For more details, see "More Information" on page 609
Remote
Command
[:SENSe]:CHPower:BANDwidth[:RESolution] <bandwidth>
[:SENSe]:CHPower:BANDwidth[:RESolution]?
Example
:CHP:BAND 5 MHz
:CHP:BAND?
Notes For numeric entries, all RBW Types choose the nearest (arithmetically, on a linear scale, rounding up)
available RBW to the value entered
The setting and querying of values depend on the current bandwidth type
Couplings Sweep time is coupled to RBW. As RBW changes, the sweep time (if set to Auto) is changed to maintain
amplitude calibration
Video bandwidth (VBW) is coupled to RBW. As the resolution bandwidth changes, the video bandwidth
(if set to Auto) changes to maintain the ratio of VBW/RBW (10:1)
608 Spectrum Analyzer Mode User's &Programmer's Reference
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