3 Spectrum Analyzer Mode
3.5 ACP Measurement
Normally, Video BW (Auto) selects automatic coupling of the Video BW to "Res BW"
on page 936. 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 the Video BW is manually selected, it may be returned to the coupled state by
pressing the Auto/Man toggle on the Video BW control. This may also be done by
pressing "Auto Couple" on page 2017 or by performing a Preset.
For more information, see "VBW Presets" on page 940
Remote Command
[:SENSe]:ACPower:BANDwidth:VIDeo <bandwidth>
[:SENSe]:ACPower:BANDwidth:VIDeo?
Example
:ACP:BAND:VID 2.4 MHz
:ACP:BAND:VID?
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 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 the VBW is implemented
by the digital IF as part of the detector
When this is the case, the VBW 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
Disabled when "Meas Method" on page 970 is RBW, FAST, FPOWer
If pressed, an advisory message is generated. If the equivalent command is sent, a "Setting conflict"
warning is generated
Couplings Video bandwidth (VBW) is normally coupled to RBW. If VBW is set to Auto, then the VBW is changed
as the RBW changes, to maintain the ratio (usually 10:1)
Preset See "VBW Presets" on page 940 below
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 actually used for VBW (see above)
Backwards
Compatibility
Notes
For backwards compatibility this command accepts both the BANDwidth and BWIDth forms
Auto Function
Remote
[:SENSe]:ACPower:BANDwidth:VIDeo:AUTO ON | OFF | 1 | 0
Spectrum Analyzer Mode User's &Programmer's Reference 939
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