3 Spectrum Analyzer Mode
3.4 Occupied BW Measurement
:OBW:BAND:AUTO?
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 BW" on page 771 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)
When Res BW is set to Auto, the resolution bandwidth is auto-coupled to the span. The ratio of
Span/RBW is approximately 106:1 when auto coupled. When Res BW is set to Man, and the
bandwidths are entered manually, these bandwidths are used regardless of other instrument settings
Preset Auto, unless noted in "RBW Presets" on page 771 below
See table below
State Saved Saved in instrument state
Min 1 Hz
Max 8 MHz is the max equivalent –3dB RBW, which means that the named RBW (the one shown on the
control etc.) can exceed 8MHz if using a filter other than –3dB Gaussian
Annotation A “#” mark appears before “RBW” in the annotation when it is switched from Auto to Manual coupling
Backwards
Compatibility
Notes
For backwards compatibility, this command supports both BANDwidth and BWIDth forms
For ESA, the maximum Res BW was 5 MHz; for X-Series it is 8 MHz
RBW Presets
Unless noted in the table below, the Preset value of RBW is Auto.
Mode Preset Value
WCDMA 30 kHz
BT 10 kHz
WLAN 100 kHz
MSR 30 kHz
LTE, LTETDD, LTEAFDD, LTEATDD, 5G NR 30 kHz
Video BW
Lets you change the instrument post-detection filter (VBW or “video bandwidth”)
from 1Hz to 8MHz, in approximately 10% steps. In addition, a wide-open video
filter bandwidth may be chosen by selecting 50MHz. The VBW is annotated at the
bottom of the display, in the center.
Spectrum Analyzer Mode User's &Programmer's Reference 771
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