Exfo OTDR 2 Manual do Utilizador descarregar pdf (Página 203)

Description of Event Types

OTDR 195

Merged Event

 The total loss ( dB) produced by the events is measured by plotting

two straight lines.

 The first line is plotted by fitting, through least-square

approximation, trace points in the linear area preceding the first

event.

 The second line is plotted by fitting, through least-square

approximation, trace points in the linear area following the second

event. If there were more than two merged events, this line would

be plotted in the linear area following the last merged event. This

line is then projected toward the first merged event.

 The total loss ( dB) equals the power difference between the

point where the first event begins (point A) and the point on the

projected straight line located just below the first event (point B).

 No loss value can be specified for the subevents.

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Exfo OTDR 2 Manual do Utilizador Página 203