3 VMA Mode
3.8 ACP Measurement
corresponding bandwidth of the single LTE carrier, as shown in the table below. In
the Multi-carrier case, the narrowest Res BW among the active carriers is used.
LTEAFDD, LTEATDD Modes
Carrier BW Auto Res BW, kHz
1.4 MHz 51
3 MHz 51
5 MHz 100
10 MHz 100
15 MHz 100
20 MHz 100
200 kHz (NB-IoT in FDD) 10
5G NR Mode
100 kHz for all carrier bandwidths.
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 "Res BW"
on page 1214. 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" on page 1825 or by performing a Preset.
For more information, see "VBW Presets" on page 1217
Remote Command
[:SENSe]:ACPower:BANDwidth:VIDeo <bandwidth>
[:SENSe]:ACPower:BANDwidth:VIDeo?
Example
:ACP:BAND:VID 2.4 MHz
:ACP:BAND:VID?
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 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
Vector Modulation Analyzer Mode User's &Programmer's Reference 1216
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