Filter
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Occupied Bandwidth Measurement
BW
Filter Type
Allows you to select the type of filter to be used for the current measurement. Besides the Gaussian filter
shape, there are certain special filter types, such as Flat Top, that are desirable under certain conditions.
Dependencies: When using the average detector with either Sweep Time set to Man, or in
zero span, the VBW setting has no effect and is disabled (grayed out).
Couplings: Video bandwidth (VBW) is coupled to RBW. As the resolution bandwidth
changes, the video bandwidth (if set to Auto) changes to maintain the ratio set
by VBW/RBW.
Sweep Time is coupled to Video Bandwidth (VBW). As the VBW is changed,
the sweep time (when set to Auto) is changed to maintain amplitude
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 (Auto) sweep time, and is not
disabled. In this case, reducing the VBW setting increases the sweep time,
which increases the averaging time, producing a lower-variance trace.
When the video bandwidth is AUTO coupled, the video bandwidth value is set
to:
Resolution Bandwidth * Video Bandwidth to Resolution Bandwidth Ratio
Preset: LTE, LTETDD, WLAN: Auto
WCDMA: 300 kHz
CDMA2K:120 kHz
WIMAX OFDMA: 1 MHz
TD-SCDMA: 300 kHz
1xEVDO: 300 kHz
BLUETOOTH: 30 kHz
ON
State Saved: Saved in instrument state.
Min: 1 Hz
Max: 50 MHz
Backwards Compatibility SCPI: [:SENSe]:OBWidth:BWIDth:VIDeo
Initial S/W Revision: Prior to A.02.00
Modified at S/W Revision: A.03.00
Key Path:
BW