Keysight N9938-90003 User’s Guide 139
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
Trigger Settings Annotation
Trigger settings are annotated on the FieldFox screen as highlighted in red in
the following image:
—Square: Trig Type (VidT), AutoTrigger (a), Pos Slope (/), Neg Delay (delay-)
— Horizontal arrow: Trig Level (green horizontal graticule at -20 dBm)
— Vertical arrow: Trig Position T-zero indicators (green arrows at 2nd vertical
graticule)
FFT Gating (Opt 238)
Time-gated spectrum analysis allows you to obtain spectral information about
signals occupying the same part of the frequency spectrum that are separated
in the time domain. Using an external trigger signal to coordinate the
separation of these signals, you can perform the following operations:
— Measure any one of several signals separated in time; for example, you can
separate the spectra of two radios time-sharing a single frequency.
— Measure the spectrum of a signal in one time slot of a TDMA system.
— Exclude the spectrum of interfering signals, such as periodic pulse edge
transients that exist for only a limited time.
FFT Gating is a simple, efficient way to set the proper amount of trigger delay
and capture time so that signal artifacts of a repeating waveform or pulse can
be examined in the frequency domain. Learn more about trigger settings in
“Triggering” on page 136.
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