EXFO FTB-5800 Chromatic Dispersion Analyzer for FTB-400 - Manual (Page 63)

Managing Results
Chromatic Dispersion Analyzer 57
Establishing Thresholds
The Slope 0 Threshold is the slope of the dispersion curve evaluated at
the points where the dispersion is null (lambda 0). In the Results Graph
tab, you will have four possible results:
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Pass if the slope at lambda 0 is less than or equal to the threshold.
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Fail if it is greater than the threshold.
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Fit if your slope at lambda 0 did not respect FOTP standard 169. This
standard requires other points within 100 nm; otherwise, the slope at
lambda 0 is not reliable and can only be used as a reference.
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--- if you did not select any thresholds.