Keysight x-series User Manual

3 Spectrum Analyzer Mode
3.4 Occupied BW Measurement
Video BW (Auto) selects automatic coupling of Video BW to "Res BW" on page 770.
To decouple the resolution bandwidth, press the Auto/Man toggle on the Video BW
control, or simply enter a different value for Video BW.
When Video BW is manually selected, it may be returned to the coupled state by
pressing the Auto/Man toggle on Video BW. This may also be done by pressing
"Auto Couple" on page 2017 or by performing a Preset.
Remote Command
[:SENSe]:OBWidth:BANDwidth:VIDeo <bandwidth>
[:SENSe]:OBWidth:BANDwidth:VIDeo?
[:SENSe]:OBWidth:BANDwidth:VIDeo:AUTO ON | OFF | 1 | 0
[:SENSe]:OBWidth:BANDwidth:VIDeo:AUTO?
Example
:OBW:BAND:VID 2.4 MHz
:OBW:BAND:VID?
:OBW:BAND:VID:AUTO ON
:OBW:BAND:VID:AUTO?
Notes For numeric entries, the instrument chooses the nearest (arithmetically, on a linear scale, rounding
up) available VBW to the value entered. The 50MHz VBW is defined to mean “wide open”
The values shown in this table reflect the conditions after a Mode Preset
Dependencies Sometimes the displayed Video BW is not actually used to process the trace data:
When the Average detector is selected, and Sweep Type is set to Swept, the video bandwidth filter
cannot be used, because it uses the same hardware as the Average detector
When the Quasi-Peak, EMI Average, or RMS Average detector is selected, Video BW is implemented
by the digital IF as part of the detector
In this case, Video BW still acts to change the Sweep Time, if Sweep Time is in Auto, and still affects
the data on other traces for which this is not the case
Couplings Normally coupled to Res BW. If Video BW is set to Auto, then video bandwidth is changed as Res BW
changes, to maintain the preset ratio (normally 10:1)
Preset Auto, unless noted in "Video BW Presets" on page 772 below
ON
State Saved Saved in instrument state
Min 1 Hz
Max 50 MHz
Annunciation A “#” mark appears before “VBW” in the annotation when it is not coupled
Annotation In the bottom center of the screen, “VBW <value> <units>” indicates the current video bandwidth
value. Note that for some detectors this is not the value used for VBW (see above)
Backwards
Compatibility
Notes
For backwards compatibility, this command supports both BANDwidth and BWIDth forms
Video BW Presets
Unless noted in the table below, the Preset value is Auto.
772 Spectrum Analyzer Mode User's &Programmer's Reference

Keysight x-series Specifications

General

Analysis Bandwidth	Up to 1 GHz (depending on model)
Real-Time Bandwidth	Up to 1 GHz (depending on model)
Form Factor	Benchtop
Connectivity	LAN, USB, GPIB
Resolution Bandwidth	1 Hz to 10 MHz (depending on model)