Filter
Top Products
1277
Sweep/Control
occasion you may wish to limit the FFT Width to be narrower than that which the instrument would have
set.
NOTE This function does not allow you to widen the FFT Width beyond that which the
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 setting will have no effect unless in an FFT sweep.
See “More Information” on page 1278
Key Path: Sweep/Control, Sweep Setup
Remote Command: [:SENSe]:SWEep:FFT:WIDTh <real>
[:SENSe]:SWEep:FFT:WIDTh?
Example: SWE:FFT:WIDT 167 kHz sets this function to “<167.4 kHz”
Notes: 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
Dependencies: In some models, the analog prefilters are not provided. In these models the
FFT Width function is always in Auto. The FFT Width key is blanked in these
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.
Couplings: The FFT Width affects the
ADC Dither function (see Meas Setup key) and the
point at which the instrument switches from Swept to FFT acquisition.
Preset: The Preset is Auto, but Preset will also pick Best Dynamic Range and hence
this function will be set to ~Maximum
State Saved: Saved in instrument state
Min: 4.01 kHz