Agilent Technologies Signal Analyzer N9030a - Manual (Page 1163)

6 RLC Swept SA Measurement Front-Panel & SCPI Reference
Sweep/Control
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
Max The maximum available FFT width is dependent on the IF Bandwidth option. The maxim mum
available width is:
Option B10, 10 MHz;
Option B25, 25 MHz,
Option B40, 40 MHz.
Backwards
Compatibility SCPI [:SENSe]:SWEep:FFT:SPAN:RATio <integer>
[:SENSe]:SWEep:FFT:SPAN:RATio?
This is the legacy “FFTs per Span” command, because in the PSA, this is what you set rather
than the FFT Width. The behavior of the analyzer when it receives this command is to compute
the “intended segment width” by dividing the Span by the FFTs/Span parameter, then
converting this intended width to an actual width by using the largest available FFT Width that is
still less than the intended segment width. The “Span” used in this computation is whatever the
Span is currently set to, whether a sweep has been taken at that Span or not.
Initial S/W Revision Prior to A.02.00
Modified at S/W
Revision A.04.00
Remote Language Compatibility Measurement Application Reference 1163