Exfo IQS-12002B Calibration System Manual do Utilizador descarregar pdf (Página 80)

Calibration Methods

76 IQS-12002B

FTB-7000D and FTB-7000B-B OTDR Modules

Uncertainties

The uncertainties for distance calibration are as follows:

³ Reference fiber (as per the calibration certificate issued by the national

laboratory where the fiber was calibrated).

³ Environment temperatures.

³ Chromatic dispersion.

³ Wavelength differences: calibration wavelength for the reference fiber

versus OTDR wavelength, and OTDR wavelength uncertainties.

³ OTDR resolution.

Traceability

Distance calibration is performed by comparing the length of a reference

fiber (traceable to a national metrology institute) as measured by the OTDR

under test with the reference fiber length given by the specification.

Reference fibers are calibrated at NPL (National Physical Laboratory in the

UK) or METAS (Swiss Federal Office for Metrology).

EXFO traceability of OTDRs

Working

standard

Reference fiber

DUT

OTDR

Reference fiber calibration is traceable to the national metrology of

Switzerland, named METAS or Swiss Federal Office for Metrology.

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Exfo IQS-12002B Calibration System Manual do Utilizador Página 80