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5.Menu Interpretation
37
5.5 【BW】Bandwidth
Sets the RBW (Resolution Bandwidth) and VBW (Video Bandwidth)
parameters of the analyzer. Pop out the setting menu includes
[RBW Auto Man], [VBW Auto Man], [EMI Filter On Off].
5.5.1 [RBW Auto Man]
Adjust the resolution bandwidth ranging from 10Hz-1MHz. Use
numeric key, step key or knob to switch resolution bandwidth. The
underline under Auto or Manual means Auto mode or Manual
mode. Press [Resolution Bandwidth Auto Manual] and hold it until
underline under Auto has been highlighted. Then the resolution
bandwidth is under auto coupling mode.
Key points:
⚫ Reducing the value of RBW will increase the frequency
resolution, but may also cause sweeps to take longer (Sweep
Time is effected by a combination of RBW and VBW when it is in
Auto mode).
⚫
RBW decreases with the span (non-zero span) in Auto RBW
mode.
5.5.2[VBW Auto Man]
Sets the desired video bandwidth in order to remove the band
noise. Set the video resolution displays in function area, ranging
from 10Hz to 1MHz by sequence step. You can modify this
parameter by numeric key, step key or knob. The underline under
Auto or Manual means Auto mode or Manual mode. Press [VBW
Auto Manual] and hold it in manual until the underline highlighted
under Auto to return auto mode.
Key points:
⚫ Reducing the VBW to smooth the spectrum line and differentiate
small signals from the noise. However, this may cause a longer
sweep time. (Sweep Time is effected by a combination of RBW
and VBW when it is in Auto mode).
⚫ VBW varies with RBW when it is set to Auto.
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