Keysight M9421A - Enable Wideband IF for FFT

3 WLAN Mode
3.4 SEM Measurement
off case, and when it is high, it acts like the fully-on case, and in-between,
application is a compromise between attractiveness and effectiveness.
On instruments with the NF2 license installed, the calibrated Noise Floor used by
Noise Floor Extension should be refreshed periodically. Keysight recommends that
the Characterize Noise Floor operation be performed after the first 500 hours of
operation, and once every calendar year. The control to perform this is located in the
System, Alignments, Advanced menu. If you have not done this yourself at the
recommended interval, then when you turn on Noise Floor Extension, the instrument
will prompt you to do so with a dialog that says:
“This action will take several minutes to perform. Please disconnect all cables from
the RF input and press Enter to proceed. Press ESC to cancel, or Postpone to
postpone for a week”
If you Cancel, you will be prompted again the next time you turn NFE on. If you
postpone, you will be prompted again after a week passes and you then turn NFE
on.
Enable Wideband IF for FFT
When OFF, the maximum FFT BW is limited to 40 MHz. When ON, FFT with more
wideband IF is supported depending on the instrument. For example, the max FFT
BW is 510 MHz with option B5X. When ON for R10/R20/R40, the max FFT BW is
1GHz.
When this parameter is on and the following conditions are met, the measurement is
performed with a single I/Q acquisition.
–
Stop Freq of the outermost Offset range is within the available IQ acquisition BW
–
Same RBW, VBW, Detector Type settings across all Offset ranges and Carrier
–
Sweep Type = FFT and Sweep Time = Auto across all Offset ranges and Carrier
Remote Command
[:SENSe]:SEMask:WBFFt:ENABle ON | OFF | 1 | 0
[:SENSe]:SEMask:WBFFt:ENABle?
Example
:SEM:WBFF:ENAB 1
:SEM:WBFF:ENAB?
Dependencies The maximum FFT BW depends on the µW preselector and the current frequency. In hi-band, the µW
preselector must be disabled to apply the FFT with wideband IF. Otherwise, the maximum FFT BW is
limited to 40MHz
Preset
OFF
State Saved Saved in instrument state
Range
ON|OFF
641 WLAN Mode User's &Programmer's Reference