3-14
IM AQ1200-01EN
TPA
The Instrument uses the difference between the levels of the two specified points to calculate the
loss. The level of fluctuation and reproducibility in the calculated value may vary greatly. If reflection
and splice loss events are present in the section being calculated, the TPA provides a value that
has a smaller degree of error than the LSA.
1
2
Approximated line
calculation points
Event Search Conditions
Splice Loss
If a splice loss that exceeds the specified threshold occurs, it is detected as an event.
The range is 0.01 dB to 9.99 dB.
Return Loss
If a return loss that is less than or equal to the specified threshold occurs, it is detected as an event.
The larger the reflection, the smaller the return loss, so events (reflections) are detected when the
return loss is less than or equal to the threshold.
The range is 20 dB to 70 dB.
Fiber Ends (Fresnel reflection)
If a reflection that exceeds the specified threshold occurs, it is detected as the end of the fiber.
The range is 3 dB to 65 dB.
Splitter Search
ON Losses (reflections) that exceed splitter loss are displayed as splitters.
The threshold at the end of the fiber is automatically set to its maximum value.
OFF Losses (reflections) that exceed splitter loss are displayed as normal events.
Splitter Loss
Events whose loss exceeds this value are assumed to be splitters.
3.6 Setting Analysis Conditions
