Exfo OTDR 2 Uživatelský manuál stáhnout pdf (Strana 198)

Description of Event Types

190 OTDR

Reflective Event

Reflective events appear as spikes in the fiber trace. They are caused by an

abrupt discontinuity in the index of refraction.

 Reflective events cause a significant portion of the energy initially

launched into the fiber to be reflected back toward the source.

 Reflective events may indicate the presence of connectors,

mechanical splices, or even poor-quality fusion splices or cracks.

 Normally, loss and reflectance values are specified for reflective

events.

 When the reflective spike reaches the maximum level, its top may be

clipped due to the saturation of the detector. As a result, the dead zone

(minimum distance for making a detection or attenuation

measurement between this event and a second nearby) may be

increased.

 If you set thresholds, the application indicates a reflective fault in the

events table, whenever a value exceeds reflectance or connector loss

thresholds (see Setting Pass/Fail Thresholds on page 39).

Reflected

power (dB)

Distance

(km)

Reflective events

Clipped level

1 2 ... 193 194 195 196 197 198 199 200 201 202 203 ... 218 219

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Exfo OTDR 2 Uživatelský manuál Strana 198