Agilent Technologies 86038B User Manual page 114

Trigger Mode
Single Sweep
In swept measurement mode, this mode causes the Begin
Measurement control to initiate one measurement of the
wavelength range.
Repeat Sweep
In this mode, the spectral measurements are continuously
repeated until the measurement is canceled or the instrument is
set to Single Sweep. This mode results in an optical spectrum
analyzer-like real-time display and is valuable while making
adjustments.
Tip: Fast access to the Trigger Mode setting is from the icon on
the toolbar.
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Agilent 86038B Photonic Dispersion and Loss Analyzer, Second Edition