RIGOL
Chapter 2 Front Panel Operation
User’s Guide for DSA800E Series
2-24
VBW
Set the desired video bandwidth in order to filter out the noise outside the video
band.
Key Points:
Reducing the VBW will smooth the spectrum line to differentiate small signals
from noise, but will increase the sweep time (Sweep Time is affected by a
combination of RBW and VBW when it is in Auto mode).
VBW varies with RBW when it is set to Auto. While in Manual mode, VBW is
not affected by RBW.
You can use the numeric keys, the knob, or the arrow keys to modify the
parameter. For more details, please refer to "
".
Table 2-14 VBW
Parameter
Explanation
Default
1 MHz
Range
1 Hz to 3 MHz
Unit
GHz, MHz, kHz, Hz
Knob Step
in 1, 3, 10 sequence
Arrow Key Step
in 1, 3, 10 sequence
V/R Ratio
Set the ratio of VBW to RBW.
Key Points:
This value is different while measuring different kinds of signals:
Sine signal: use 1 to 3 (for faster sweeps)
Pulse signal: use 10 (to reduce the influence on the amplitude of transient
signals)
Noise signal: generally use 0.1 (to obtain the average of noises)
You can use the numeric keys, the knob, or the arrow keys to modify the
parameter. For more details, please refer to "
".
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