3 Short-Range Comms & IoT Mode
3.12 Monitor Spectrum Measurement
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
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 set by the VBW:3 dB RBW control (usually 10:1 for
measurements that do not have a VBW:3 dB RBW control)
Preset Auto (unless noted in table 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 actually used for VBW (see above)
Backwards
Compatibility
Notes
For backwards compatibility this command obeys both the BANDwidth and BWIDth forms
VBW Presets
Unless noted in the table below, the Preset value of VBW is Auto.
Mode Preset VBW
WLAN
1 MHz
LTE, LTETDD, LTEAFDD, LTEATDD
1 MHz
5GNR
1 MHz
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 using the rules described below in "Coupling Auto Rules" on page 1677. To
decouple the ratio, press the Auto/Man toggle on the VBW:3 dB RBW control, or
simply enter a different value for VBW:3 dB RBW.
When the VBW:3dB RBW is manually selected, it may be returned to the coupled
state by setting the toggle on the VBW:3 dB RBW control back to Auto. This may
also be done by pressing Auto Couple or by performing a Preset.
Remote
Command
[:SENSe]:MONitor:BANDwidth:VIDeo:RATio <real>
[:SENSe]:MONitor:BANDwidth:VIDeo:RATio?
1676 Short Range Comms & IoT Mode User's &Programmer's Reference
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