Spectrum Analyzer Measurements 3-6 Setting Bandwidth Parameters
Spectrum Analyzer MG PN: 10580-00447 Rev. H 3-19
Setting Frequency Bandwidth
1. Select BANDWIDTH on the main menu.
2. Toggle AUTO RBW or AUTO VBW (or both) off to manually change values. If using Auto, refer to the
following sections.
3. Set the RBW and VBW to achieve the desired resolution and sweep characteristics. Lower values
increase resolution and reduce noise, but at the expense of measurement (sweep) speed.
4. Set the VBW TYPE to Logarithmic (geometric mean) or Linear (arithmetic mean).
Setting Bandwidth Auto Coupling
Both resolution bandwidth and video bandwidth can be coupled to the frequency span automatically, or set
manually. When set to Auto RBW, the instrument automatically adjusts the RBW in proportion to the
frequency span. The default ratio of the span width to the resolution bandwidth is 100:1 and can be changed as
follows:
1. Select BANDWIDTH on the main menu.
2. Select SPAN:RBW and change the coupling value, and then press ACCEPT to enter the value.
When auto-coupling between the span and RBW is selected (AUTO RBW is toggled on), the bandwidth
parameter is displayed normally at the bottom of the graph. If manual RBW is selected (AUTO RBW is toggled
off), the bandwidth label at the bottom of the graph is prefixed with the ‘#’ symbol, and resolution bandwidth is
set independently of the span.
Auto coupling VBW links the video bandwidth to the resolution bandwidth so that VBW varies in proportion to
RBW. If manual VBW coupling is selected, the VBW label at the bottom of the graph is prefixed with the “#”
symbol and video bandwidth is set independently of resolution bandwidth.
By default, the RBW/VBW ratio is set to 3 and can be changed as follows:
1. Select BANDWIDTH on the main menu.
2. Select RBW/VBW and enter the desired value.
The RBW range varies with instrument features. Refer to “BANDWIDTH Menu” on page 3-20 and check your
technical data sheet for the bandwidth range of your instrument.
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