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Beschreibung der Ereignistypen
OTDR 119
Überlagertes reflektives Ereignis
³ Die von den Ereignissen erzeugte Gesamtdämpfung (Δ dB) wird durch
Auftragen von zwei Geraden gemessen.
³ Die erste Linie wird durch Auftragen von Kurvenpunkten im
linearen Bereich vor dem ersten Ereignis gezeichnet
(LSA-Methode).
³ Die zweite Linie wird durch Auftragen von Kurvenpunkten im
linearen Bereich hinter dem zweiten Ereignis gezeichnet
(LSA-Methode). Liegen mehr als zwei überlagerte Ereignisse vor,
wird diese Linie im linearen Bereich nach dem letzten
überlagerten Ereignis aufgetragen. Diese Linie wird dann zum
ersten überlagerten Ereignis projiziert.
³ Der Gesamtverlust (Δ dB) entspricht der Leistungsdifferenz
zwischen dem Punkt, an dem das erste Ereignis beginnt (Punkt A)
und dem Punkt auf der projizierten Geraden, der sich direkt unter
dem ersten Ereignis befindet (Punkt B).
³ Für die Nebenereignisse kann kein Dämpfungswert berechnet
werden.
127


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