Exfo FTB-7000 OTDR Series for FTB-500 Manual de usuario descargar pdf (Pagina 239)

100

101

Using the OTDR as a Light Source or VFL

OTDR 225

5. Select the desired modulation.

With the Modulation dial,

³ For loss measurement, with a power meter at the other end, select

CW (to set the source to continuous output).

³ For fiber identification, select 1kHz or 2kHz. This will allow the

person at the other end of the link to identify the fiber under test,

which could be particularly useful when working with cables

containing many fibers.

For easier fiber identification, the application also offers a flashing

pattern. If you select this pattern, the modulated signal (1 KHz or

2 KHz) will be sent for 1 second, then will be off for the next

second, then be sent again for 1 second, and so on. If you want the

OTDR to emit light in a flashing pattern, select the Blink

Modulation at 1 Hz box.

6. From the Auto-Off box, select the duration after which you want the

laser to shut off. If you want to deactivate the automatic shut-off, simply

select Disabled.

7. Press Start. You can stop light emission at any time by pressing Stop.

Using an EXFO power meter with tone-detection features, such as the

FOT-930 or FPM-300, an operator at the other end will be able to quickly

locate the correct fiber or perform loss measurements. Refer to the power

meter user guide for details.

IMPORTANT

Measurements using the CWsetting must always be taken using a

GeX detector.

An OTDR source is very powerful and it will certainly saturate Ge

and InGaAs detectors, which usually saturate at 6 dBm, while GeX

detectors saturates at 26 dBm.

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Exfo FTB-7000 OTDR Series for FTB-500 Manual de usuario Pagina 239

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