3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
optimal FFT Width based on the current setup; but on occasion you may wish to
limit FFT Width to be narrower than that which the instrument would have set.
NOTE
This function does not let you widen FFT Width beyond that which the
instrument might have set; it only lets you 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 has no effect unless in an FFT sweep.
See "More Information" on page 498
Remote Command
[:SENSe]:SWEep:FFT:WIDTh <real>
[:SENSe]:SWEep:FFT:WIDTh?
Example Set this function to “<167.4 kHz”:
:SWE:FFT:WIDT 167 kHz
Notes The parameter unit is frequency
For values sent via SCPI, the instrument chooses the smallest value that is at least as great as the
requested value
Examples:
–
Parameter 3.99 kHz is sent via SCPI. Analyzer chooses ≤4.01 kHz
–
Parameter 4.02 kHz is sent via SCPI. Analyzer chooses ≤28.81 kHz
–
Parameter 8 MHz is sent via SCPI. Analyzer chooses 10 MHz
Dependencies Does not appear in VXT models M9421A/10A/11A/15A
In some models, the analog prefilters are not provided. In these models the FFT Width function is
always in Auto. The FFT Width control is not displayed in these models, and the SCPI commands are
accepted without error but have no effect
Grayed-out in Zero Span, however, the setting can be changed remotely with no error indication
Couplings FFT Width affects ADC Dither, "Meas Setup" on page 380 and the point at which the instrument
switches from Swept to FFT acquisition
Preset The Preset is Auto, but Preset also picks Best Dynamic Range and this function is set to ~Maximum
State Saved Saved in instrument state
Min 4.01 kHz
Max Depends on the IF Bandwidth option. The maxim available width is:
Standard, 10 MHz
Option B25, 25 MHz
Option B40, 40 MHz
Option B2X, 255 MHz
Backwards
Compatibility SCPI
[:SENSe]:SWEep:FFT:SPAN:RATio <integer>
[:SENSe]:SWEep:FFT:SPAN:RATio?
Auto Function
Spectrum Analyzer Mode User's &Programmer's Reference 497
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