3 Short-Range Comms & IoT Mode
3.12 Monitor Spectrum Measurement
Normally, Res BW (Auto) selects automatic coupling of the Res BW to Span using
the ratio set by the Span:3 dB RBW control (some measurements do not have a
Span:3 dB RBW control, in which case the measurement chooses the optimal ratio).
To decouple the resolution bandwidth, press the Auto/Man toggle on the Res BW
control, or simply enter a different value for Res BW.
When the Res BW is manually selected, it may be returned to the coupled state by
pressing the Auto/Man toggle on the Res BW control. This may also be done by
pressing Auto Couple or by performing a Preset.
Only certain discrete resolution bandwidths are available. The available bandwidths
are dependent on the EMC Standard. If an unavailable bandwidth is entered with the
numeric keypad, the closest available bandwidth is selected.
See "RBW Presets" on page 1675
Remote
Command
[:SENSe]:MONitor:BANDwidth[:RESolution] <bandwidth>
[:SENSe]:MONitor:BANDwidth[:RESolution]?
[:SENSe]:MONitor:BANDwidth[:RESolution]:AUTO ON | OFF | 1 | 0
[:SENSe]:MONitor:BANDwidth[:RESolution]:AUTO?
Example
:MON:BAND 5 MHz
:MON:BAND?
:MON:BAND:AUTO ON
:MON: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 depends on the current bandwidth type
Couplings Sweep time is coupled to the RBW. As the RBW changes, the sweep time (if set to Auto) is changed to
maintain amplitude calibration
Video bandwidth (VBW) is coupled to the RBW. As the resolution bandwidth changes, the video
bandwidth (if set to Auto) changes to maintain the ratio of VBW/RBW (10:1)
When the 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 the table below)
See "RBW Presets" on page 1675 below
State Saved Saved in instrument state
Min 1 Hz
Max 8 MHz is the max equivalent –3 dB RBW, which means that the named RBW (the one shown on the
control etc.) can actually exceed 8 MHz if using a filter other than –3 dB 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 obeys both the BANDwidth and BWIDth forms
For ESA, the maximum Res BW was 5 MHz; on X-Series it is 8 MHz
1674 Short Range Comms & IoT Mode User's &Programmer's Reference
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