Exfo FTB-5230S Optical Spectrum Analyzer for FTB 200 v2 Uživatelský manuál stáhnout pdf (Strana 121)

Setting Up the Instrument in Drift Mode

OSA/OCA 115

Setting Up Drift Analysis Parameters

4. Under Global analysis parameters, define the following parameters

as needed:

 Peak detection level (dBm): indicates the minimum power level

from where the peak can be considered as a signal.

 RBW for OSNR (nm): indicates the resolution bandwidth selected

for the OSNR calculation. This parameter is generally set to 0.1 nm

to allow for a common basis of comparison between different

OSA/OCAs having different effective resolutions. The instrument’s

RBW value is written below the graph. This parameter does not

actually have an effect on the acquisition, but is only a

normalization factor used to provide the OSNR value in a

standardized manner.

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Exfo FTB-5230S Optical Spectrum Analyzer for FTB 200 v2 Uživatelský manuál Strana 121