Bird Technologies SH-362S-Manual - Manual (Page 84)

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RBW goes from 100 Hz - 1 MHz in steps of 1 / 3 / 10 (e.g., 1 kHz to 3 kHz to 10 kHz
to 30 kHz, etc.)
Video Bandwidth (VBW) determines how much smoothing is performed on a
video converted signal before the trace is displayed.
Note: VBW goes from 10 Hz to 300 kHz.

Wide (high) VBW setting: Faster sweep times, but can obscure signal
details.

Narrow (lower) VBW setting: Better trace smoothing for signals pres-
ent in high noise levels.
As the VBW is reduced, longer sweep times will be necessary to obtain a mea-
surement. To be useful, VBW must be narrower than RBW. No smoothing takes
place when VBW is greater than or equal to RBW.
Resolution BW Mode
Selects RBW mode and also toggles between automatic and manual control. In
automatic, RBW is controlled by the current span and the values of Span/RBW
and RBW/VBW. If the RBW is changed, the mode will switch to manual.
Auto RBW sets the RBW based upon the frequency span. When in Auto mode,
the RBW is set according to the nearest ratio of the Span/RBW selection. The
default ratio is 300. When the frequency span is reduced, the RBW will also be
reduced accordingly.
Example - When the span is changed to 3600 MHz, the RBW
will automatically be set to 1 MHz. When the span is reduced
to 100 MHz, the RBW will automatically reduce to 300 kHz.
Resolution BW
Click on the selection to highlight it. Then:

Up/Down Keys - Change the bandwidth incrementally.

Left/Right Keys - Change the bandwidth from min to max.

Thumbwheel - Change the bandwidth incrementally.
Video BW Mode
Selects VBW mode and also toggles between automatic and manual control. In
automatic, VBW is controlled by the current span and the values of Span/RBW
and RBW/VBW. If the VBW is changed, the mode will switch to manual.