Agilent Technologies X Series Manual page 545

This function does not allow you to widen the FFT Width beyond that which the
NOTE
instrument might have set; it only allows you to narrow it. You might do this to
improve the dynamic range of the measurement or eliminate nearby spurs from
your measurement.
Note that the
FFT Width
See "More Information" on page 546
Key Path
Remote Command
Example
Notes
Dependencies
Couplings
Preset
State Saved
Min
Max
setting will have no effect unless in an FFT sweep.
Sweep/Control, Sweep Setup
[:SENSe]:SWEep:FFT:WIDTh <real>
[:SENSe]:SWEep:FFT:WIDTh?
SWE:FFT:WIDT 167 kHz sets this function to "<167.4 kHz"
The parameter is in units of frequency.
For values sent from SCPI, the analyzer chooses the smallest value that is at
least as great as the requested value.
Examples:
Parameter 3.99 kHz is sent over SCPI. Analyzer chooses 4.01 kHz
Parameter 4.02 kHz is sent over SCPI. Analyzer chooses 28.81 kHz
Parameter 8 MHz is sent over SCPI. Analyzer chooses 10 MHz
In some models, the analog prefilters are not provided. In these models the
FFT Width function is always in
models, and the SCPI commands are accepted without error but have no
effect.
In Zero Span, this key is irrelevant and cannot be accessed (because the whole
Sweep Setup menu is grayed out in Zero Span). However, its settings can be
changed remotely with no error indication.
The FFT Width affects the
point at which the instrument switches from Swept to FFT acquisition.
The Preset is Auto, but Preset will also pick Best Dynamic Range and hence
this function will be set to ~Maximum
Saved in instrument state
4.01 kHz
The maximum available FFT width is dependent on the IF Bandwidth option.
The maximum available width is:
Option B10, 10 MHz;
Option B25, 25 MHz,
Option B40, 40 MHz.
Auto . The FFT Width key is blanked in these
ADC Dither function (see Meas Setup key) and the
Sweep/Control
545