3 Spectrum Analyzer Mode
3.10 TOI Measurement
Res BW
Activates the resolution bandwidth active function, which allows you to manually set
the resolution bandwidth (RBW) of the instrument.
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.
Remote
Command
[:SENSe]:TOI:BANDwidth|BWIDth[:RESolution] <freq>
[:SENSe]:TOI:BANDwidth|BWIDth[:RESolution]?
Example
:TOI:BWID 10 kHz
:TOI:BWID?
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" on page 1836 is coupled to RBW. As RBW changes, Sweep Time (if set to Auto) changes
to maintain amplitude calibration
"Video BW" on page 1807 is coupled to RBW. As the resolution bandwidth changes, the Video BW (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 Span. The ratio of Span/Res
BW 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
For this measurement, Res BW can be auto-coupled to Span via "Span:3dB RBW" on page 1809. This
auto-coupled RBW will not exceed 3 MHz
Preset Auto (unless noted in the table 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 supports both BANDwidth and BWIDth forms
1806 Spectrum Analyzer Mode User's &Programmer's Reference
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