892
BW
VBW:3dB RBW Selects the ratio between the video bandwidth and the equivalent 3 dB resolution bandwidth to be used
for setting VBW when VBW is in Auto.
VBW:3dB RBW (Auto) selects automatic coupling of the VBW:3 dB RBW ratio to Detector. See
“Coupling Auto Rules:” on page 893 for more information. To decouple the ratio, press VBW:3 dB
RBW until Man is underlined, or simply enter a new value.
When the VBW:3dB RBW is manually selected, it may be returned to the coupled state by pressing the
VBW:3 dB RBW key until Auto is underlined. This may also be done by pressing Auto Couple or by
performing a 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.
Preset 3 MHz
ON
State Saved Saved in Instrument State
Min 1 Hz
Max 50 MHz
Default Unit Hz
Initial S/W Revision Prior to A.02.00
Modified at S/W Revision A.02.00
Key Path BW
Remote Command [:SENSe]:BANDwidth|BWIDth:VIDeo:RATio <real>
[:SENSe]:BANDwidth|BWIDth:VIDeo:RATio?
[:SENSe]:BANDwidth|BWIDth:VIDeo:RATio:AUTO OFF|ON|0|1
[:SENSe]:BANDwidth|BWIDth:VIDeo:RATio:AUTO?