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Section 3
Measurement Application
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All manuals and user guides at all-guides.com
Non-reflection Events
Non-reflection events occur at certain points where there is some optic loss but no light scattering.
When non-reflection events occur, a power drop shows on the trace (Figure 3-2).
Inspection of Events
The 920XC OTDR sends a light pulse into the optical fiber to be inspected, receives returning
light signals, and starts calculating the event distance. The farther the distance is, the longer the
time needed for scattered light to be received by the instrument. Event distance can be calculated
according to the time of receiving events signals.
Through the inspection of scattered signals, properties of optical fiber, connectors, and tie-ins can
be identified.
The 920XC instruments display power relating to the distance of returning signals. This
information can be used to identify the main properties of an optical fiber chain.
Measurement Contents
•
Event location (distance), end, or rupture of optical fiber chain.
•
Attenuation coefficient of fiber.
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Loss of a single event (for example, one optic tie-in), or total loss from upper end to end.
•
Range of a single event like reflection of connectors (or grade of reflection).
•
Auto measurement of cumulative loss of a single event.
Trace Analysis
The trace analysis of the 920XC OTDR is fully automatic. The trace locates:
•
Reflection events of connections and mechanical tie-ins.
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Non-reflection events.
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End of optical fiber.
•
Through scanning the first loss event that is larger than the end threshold, identifies the end of
optical fiber.
•
Events list: Event type, loss, reflection, and distance.
Figure 3-2. Non-reflection Event
Greenlee / A Textron Company
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