Exfo FTB-3930 MultiTest Manual do Utilizador descarregar pdf (Página 36)

Measuring Optical Return Loss

30 FTB-3930

Performing ORL Reference and Setting ORL Zero Value

The ORL measurement procedure is outlined below:

Performing ORL Reference and Setting ORL

Zero Value

The ORL zero measurement eliminates the effects of backreflection on the

link before the component under test, so your unit displays only the

backreflection of this component.

You should set a new ORL zero:

 when you change the measurement patchcord (the one connected to

the DUT, not the reference patchcord)

 when you remove a connection between the unit and mandrel

To set the ORL zero value (all wavelengths at once):

1. From the main window, select the ORL Meter tab.

2. Press ORL Zero.

Set

ORL zero

Measure

ORL

Save

results

Perform

ORL reference

Set up thresholds

(see page 16)

Null offsets

(see page 22)

Select

wavelength

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 100 101

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Exfo FTB-3930 MultiTest Manual do Utilizador Página 36