R&S FSW Series, Руководство пользователя

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Common Measurement Settings
R&S
®
FSW
472 User Manual 1173.9411.02 ─ 43
"FFT" The FFT sweep samples on a defined frequency value and trans-
forms it to the spectrum by fast Fourier transformation (FFT) (see
also
Chapter 8.5.1.5, "How Data is Measured: the Sweep Type" ,
on page 462).
FFT is not available in the following cases:
●
when using 5-Pole filters or RRC filters
●
when using one of the CISPR detectors
●
when an external generator is active (via hardware option)
In these cases, frequency sweep is used.
Remote command:
[SENSe:]SWEep:TYPE
on page 1038
FFT Subspans
Indicates the number of FFT subspans required to cover the entire measurement
range (read-only). See also
"Number of subspans" on page 463.
Only available in FFT sweep mode in the Spectrum application, and not for SEM,
ACLR, or Spurious emissions measurements.
Remote command:
[SENSe:]SWEep:FFTSubspan?
on page 1035
Single Sweep / Run Single
After triggering, starts the number of sweeps set in "Sweep Count". The measurement
stops after the defined number of sweeps has been performed.
While the measurement is running, the "Single Sweep" softkey and the [RUN SINGLE]
key are highlighted. The running measurement can be aborted by selecting the high-
lighted softkey or key again.
Note: Sequencer. If the Sequencer is active, the "Single Sweep" softkey only controls
the sweep mode for the currently selected channel. However, the sweep mode only
takes effect the next time the Sequencer activates that channel, and only for a chan-
nel-defined sequence. In this case, the Sequencer sweeps a channel in single sweep
mode only once.
Furthermore, the [RUN SINGLE] key controls the Sequencer, not individual sweeps.
[RUN SINGLE] starts the Sequencer in single mode.
If the Sequencer is off, only the evaluation for the currently displayed channel is upda-
ted.
For details on the Sequencer, see
Chapter 6.4.1, "The Sequencer Concept" ,
on page 127.
Remote command:
INITiate<n>[:IMMediate]
on page 836
CALCulate<n>:SPECtrogram:CONTinuous
on page 1133
Continuous Sweep / Run Cont
After triggering, starts the sweep and repeats it continuously until stopped. This is the
default setting.
Bandwidth, Filter and Sweep Configuration