Rigol DSA875 Uživatelský manuál stáhnout pdf (Strana 76)

RIGOL Chapter 2 Front Panel Operation

User’s Guide for DSA800 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 modify this parameter using the numeric keys, knob or direction keys.

For more details, please refer to “Parameter Setting”.

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

Direction 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 modify this parameter using the numeric keys, knob or direction keys.

For more details, please refer to “Parameter Setting”.

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Rigol DSA875 Uživatelský manuál Strana 76