Bird Technologies SH-36S-RM-Manual - Manual (Page 51)

Settings
35
Click on the Resolution BW selection then use the arrow keys or the
mouse wheel to enter the desired bandwidth.
RBW goes from 100 Hz - 1 MHz, steps of 1 / 3 / 10 (e.g.: 1 kHz to 3 kHz
to 10 kHz to 30 kHz, etc.)
Video BW Mode (VBW) determines how much smoothing takes place.
Note:
VBW goes from 10 Hz to 300 kHz.
z Wide (high) VBW setting: Faster sweep times, but can
obscure signal details.
z Narrow (lower) VBW setting: Better trace smoothing for
signals present in high noise levels.
As the VBW is reduced, longer sweep times will be necessary to obtain
a measurement. To be useful, VBW must be narrower than RBW. No
smoothing takes place when VBW is greater than or equal to RBW.
Resolution & Video BW Modes
Click on these to toggle RBW or VBW, respectively, between auto-
matic and manual control. In automatic, they are controlled by the
current span and the values of Span/RBW and RBW/VBW. If either
the RBW or VBW is changed, these 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.
Auto VBW sets the VBW based upon the RBW value. When in Auto
mode, the VBW is set according to the nearest ratio as set using the
VBW/RBW selection. The default ratio is 3. As the RBW span is
reduced the VBW will be reduced accordingly.
Example - When the RBW is changed to 1MHz, the VBW will
automatically be set to 300kHz. When the RBW is reduced to
30kHz, the VBW will automatically be set to 10kHz.