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Ideal Networks LanTEK III Manual

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Chapter 8
Fiber testing (LWL) FiberTEK™ FDX
77
8.7. Calibration
During calibration, FiberTEK™ FDX calculates a reference level for the loss measurement.
Calibration accuracy depends on warm-up period of measuring adapter and quality of the test
cords.
Illustration 8.7. Calibration (general)
NOTE:
The launch and tail cords must correspond to the type of fiber to be tested (e.g. 50- m
launch fibers for testing of 50- m cable).
All connections on launch, tail and reference cords must be in compliance with the
requirements of ISO/IEC 14763-3 concerning length as well as insertion loss.
To ensure the specified measuring accuracy, a sufficient heating period must be considered
for the measuring adapter.
The temperature of LanTEK
®
II Cable Tester and measuring adapter should correspond to
the ambient temperature.
To prevent condensation on optics, do not remove dust covers on measuring adapters
before performing cable test.
Close optical input/output again immediately with dust covers after removal of launch
fibres.
The calibration values are saved in the Display handset (DH). The loss of the launch fibers
and couplers used during calibration are deducted from the loss results during the cable test.
Before testing of fibers a calibration should be performed if:
the launch cords have been subject to change or strong movement;
the fiber type has been changed;
the measuring adapters have been changed;
a device has been powered on or off;
the test setup has been moved;
a connection from the port of FiberTEK™ FDX module has been removed/changed.
8.8. Performing Calibration
1. Connect Display handset (DH) and Remote handset (RH).
NOTE:
Delivery includes three (3) interchangeable connector adapters for ST, SC and FC
connectors. Other possible plug faces (LC) must be handled with hybrid launch cords (Ex.
SC-LC).
… 78 …


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