A normalizing (compensation) coil is used in OTDR measurements to compensate for the dead zone at the entrance to the fiber under test. The use of a normalizing coil makes it possible to estimate the losses at the first connector of the FOCL line, in addition, the risk of damage to the optical connector of the reflectometer by poor-quality patch cords is reduced.
The reel has a sturdy protected case inside which there is a 1000 m (for single mode) or 200 m (for multimode) fiber supply, terminated with optical cords with FC, SC, ST or LC connectors. The type of connector is determined by the customer depending on the needs.
The normalizing (compensation) coil, connected between the reflectometer and the optical cross-section of the line, allows you to "leave" the dead zone and evaluate the quality of the installation of the optical distribution frame, as well as correctly measure the total attenuation in the line.
And all because even the most modern optical reflectometers have a so-called "near dead zone" - a dead zone, which makes it impossible to obtain information about the initial section of the line. The length of the dead zone is different for different devices and can range from several meters to hundreds of meters.
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