Agilent Technologies Signal Analyzer N9030a User Manual
Page 552
6 RLC Swept SA Measurement Front-Panel & SCPI Reference
BW
An * is displayed next to the VBW annotation when certain detector types (Average, EMI Average, Quasi
Peak, and RMS Average) are in use. This is because the VBW filter is out of the circuit for these
detectors and does not affect any traces which use them. If there is any active trace using one of these
detectors the * is displayed. See
"Annotation Examples" on page 553
Normally, Video BW (Auto) selects automatic coupling of the Video BW filter to the resolution
bandwidth filter using the ratio set by the VBW:3 dB RBW key. To decouple the video bandwidth,
press Video BW until Man is underlined, or simply enter a new value.
When the Video BW is manually selected, it may be returned to the coupled state by pressing the
Video BW
key until Auto is underlined. This may also be done by pressing Auto Couple or by
performing a Preset.
Key Path
BW
Remote Command
[:SENSe]:BANDwidth|BWIDth:VIDeo
[: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?
Notes
For numeric entries, the analyzer chooses the nearest (arithmetically, on a linear scale, rounding
up) available VBW to the value entered. The 50 MHz VBW is defined to mean “wide open”.
The values shown in this table reflect the conditions after a Mode Preset.
Dependencies
Sometimes the displayed Video BW is not actually used to process the trace data:
•
When the Average Detector is selected and Sweep Type is set to Swept, the video bandwidth
filter cannot be used, because it uses the same hardware as the Average Detector.
•
When the Quasi-Peak, EMI Average or RMS Average detector is selected the VBW is
implemented by the digital IF as part of the detector
When this is the case, the VBW still acts to change the Sweep Time, if Sweep Time is in Auto,
and still affects the data on other traces for which this is not the case.
Preset
3 MHz
ON
State Saved
Saved in instrument state
Min
1 Hz
552
Remote Language Compatibility Measurement Application Reference