Video Bw - Agilent Technologies PSA Series User And Programming Manual

2.3.2 Video BW

Enables you to change the analyzer post-detection filter from 1 Hz to 8 MHz in
approximately 10% steps. In addition, a wide-open video filter bandwidth (VBW) may be
chosen by selecting 50 MHz.
filter to the resolution bandwidth filter using the VBW/RBW ratio set by the
Sweep Time is coupled to Video Bandwidth (VBW). As the VBW is changed,
NOTE
the sweep time (when set to
calibration. This occurs because of common hardware between the two
circuits, even though the Video BW filter is not actually "in-circuit" when the
detector is set to Average. Because the purpose of the average detector and
the VBW filter are the same, either can be used to reduce the variance of the
result.
Although the VBW filter is not "in-circuit" when using the average detector,
the Video BW key can have an effect on (
disabled. In this case, reducing the VBW setting increases the sweep time,
which increases the averaging time, producing a lower-variance trace.
However, when the EMI Average detector is selected, the Video BW is
restricted to 1 Hz while the sweep time is set to
When using the average detector with either
span, the VBW setting has no effect and is disabled (grayed out).
A "#" mark appears next to VBW on the bottom of the analyzer display when it is not
coupled. To couple the video bandwidth, press
Key Path:
BW/Avg
Saved State: Saved in Instrument State
Factory Preset: Auto (3 MHz)
Range: 1 Hz to 50 MHz
Remote Command:
[:SENSe]:BANDwidth|BWIDth:VIDeo <freq>
[:SENSe]:BANDwidth|BWIDth:VIDeo?
[:SENSe]:BANDwidth|BWIDth:VIDeo:AUTO OFF|ON|0|1
[:SENSe]:BANDwidth|BWIDth:VIDeo:AUTO?
Example:
BAND:VID 1 kHz
BAND:VID?
BWID:VID:AUTO ON
BWID:VID:AUTO?
Chapter 2
selects automatic coupling of the Video BW
Video BW (Auto)
) is changed to maintain amplitude
Auto
Video BW (Auto)
Instrument Functions: A - L
) sweep time, and is not
Auto
.
Auto
set to
Sweep Time Man
(or press
Auto All
BW/Avg
key.
VBW/RBW
, or in zero
).
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