Agilent Technologies 86038A User Manual page 84

Making Measurements Fiber Measurement
8 From the Measurement menu, press Begin Meas to start the measurement
process.
When the measurement is complete, a trace is displayed for Port 1 GD
(group delay), Port 1 Loss, and Port 1 CD (chromatic dispersion).
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Agilent 86038A Optical Dispersion Analyzer, Third Edition