VeEX FX150, Руководство пользователя

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OTDR Series e-Manual, RevE00 Page 76 of 128
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Include Event Loss : Check to not include connector loss in Total Loss Summary.
If Event Loss is not checked, the LinkMap will state that the event loss is
not included.
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Compensated Loss (dB) : For OTDR with built-in internal launch fiber, (G.657), the
OTDR connector insertion loss will depend on the fiber type connected to the test set.
Mismatched fibers can result in higher panel loss than expected connector loss. Use the
Span button to enter fiber mismatch compensation. Mismatch fibers should not impact
Reflectance.
The same procedure for offsetting Launch Fibers applies to offsetting Receiver fibers which
are often used in Fiber to The Antenna (FTTA) applications.
The FX300 and RXT OTDRs have a built-in launch fiber which is
approximately 40 meters in length. This fiber section will appear in grey color
preceding the OTDR connection. This internal launch fiber allows the first
connector of the fiber under test to be characterized and its performance
(insertion loss and reflectance) be evaluated. The MTTplus OTDR has an
optional built-in launch fiber.
7.3.2.1 Measure Cables
Use the Measure button to measure the Launch/Receive cables and populate the result into
the Length field automatically.
To measure cable length:
1. Click the Measure button. The Launch and Receive Fiber Measurement screen is
displayed.
2. Select which cable ( Launch only , Receive only , or Launch and Receive ) to measure. To
measure both cables (Launch and Receive), connect the cables together, but this requires
a connection to have -55dB reflectance. Then, click OK . The Launch and Receive Cable
Measurement screen is displayed.