3 VMA Mode
3.3 Monitor Spectrum Measurement
RBW Presets
Unless noted in the table below, the Preset value of RBW is Auto.
Mode Preset RBW
WLAN
100 kHz
LTE, LTETDD, LTEAFDD, LTEATDD
100 kHz
5GNR
100 kHz
Video BW
Lets you change the instrument post-detection filter (VBW or “video bandwidth”)
from 1 Hz to 8 MHz in approximately 10% steps. In addition, a wide-open video filter
bandwidth may be chosen by selecting 50 MHz. The VBW is annotated at the
bottom of the display, in the center.
Normally, Video BW (Auto) selects automatic coupling of the Video BW to RBW
using the ratio set by the VBW:3 dB RBW control. To decouple the resolution
bandwidth, press the Auto/Man toggle on the Video BW control, or simply enter a
different value for Video BW.
When the Video BW is manually selected, it may be returned to the coupled state by
pressing the Auto/Man toggle on the Video BW control. This may also be done by
pressing Auto Couple or by performing a Preset.
Remote Command
[:SENSe]:MONitor:BANDwidth:VIDeo <bandwidth>
[:SENSe]:MONitor:BANDwidth:VIDeo?
[:SENSe]:MONitor:BANDwidth:VIDeo:AUTO ON | OFF | 1 | 0
[:SENSe]:MONitor:BANDwidth:VIDeo:AUTO?
Example
:MON:BAND:VID 2.4 MHz
:MON:BAND:VID?
:MON:BAND:VID:AUTO ON
:MON:BAND:VID:AUTO?
Notes For numeric entries, the instrument 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
607 Vector Modulation Analyzer Mode User's &Programmer's Reference
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