EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 334)

Managing Results
326 FTB-5240S/5240BP
Managing Drift Test Results
To view channel history results:
From the main window, select the Channel History tab.
Results for the following parameters related to the selected channel are
displayed in the Channel History table:
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Spectral position (center of mass of wavelength or frequency) of the
channel against time (nm or THz)
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Signal power of the channel against time (dBM)
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OSNR of the channel against time (dB)
For each of the above parameters, the following results are displayed:
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Reference: indicates the channel reference values for the current drift
acquired during the initial acquisition.
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Current Drift: indicates the current drift values, that is, the current
deviation from the channel’s reference for the drift’s latest acquisition.
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Maximum: indicates the maximum values reached during the drift.
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T Max.: indicates the time of the drift at which the channel was at its
maximum value. Displayed time is relative to the time at the start of the
drift measurement.
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Minimum: indicates the minimum values reached during the drift.
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T Min.: indicates the time of the drift at which the channel was at its
minimum value. Displayed time is relative to the time at the start of the
drift measurement.