EXFO FOT-5200 Coarse Spectrum Analyzer - Manual (Page 27)

Setting Up and Operating your FOT-5200
CWDM Analyzer 21
dB/dBm
dB/dBm
The CWDM Analyzer automatically changes to the absolute power value
(dBm or mW) display mode when the power goes on.
The latest scan value is saved as reference value when you press
dB/dBm (
).
If you press scan after connecting the connector to the optical port that
you want to measure, the standard value and relative value of the current
value are displayed.
Example of using dB/dBm:
1. Select the wavelength for measurement using CWDN SCAN button or
the arrow buttons.
2. Connect the optical source connector which will be saved as the first
reference value to the optic adaptor of FOT-5200.
3. To set up the first reference
value (dBm) as relative value (dB),
press dB/dBm and ensure it displays
0 dB.
4. After removing the optical source
connector from the FOT-5200,
connect the actual light source to
the FOT-5200 to get the loss value
and check the loss value as shown
to the right.