User manual

User’s Guide for DSA800 Series
Chapter 2 Front Panel Operation RIGOL
2-23
Sweep and Function Settings
BW/Det
Set the RBW (Resolution Bandwidth), VBW (Video Bandwidth) and detector type
parameters of the analyzer.
RBW
Set the desired resolution bandwidth in order to distinguish between signals which
are close in frequency.
Key Points:
 Reducing RBW will increase the frequency resolution, but will increase the
sweep time (Sweep Time is affected 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.
 You can modify this parameter using the numeric keys, knob or direction keys.
For more details, please refer to “Parameter Setting”.
Note: if detector type is “Quasi-Peak” or filter type is “EMI”, RBW can be 200 Hz, 9
kHz or 120 kHz only.
Table 2-12 RBW (Filter Type is Gauss)
Parameter
Explanation
Default
1 MHz
Range
100 Hz to 1 MHz
Unit
GHz, MHz, kHz, Hz
Knob Step
in 1, 3, 10 sequence
Direction Key Step
in 1, 3, 10 sequence