Keysight Technologies 86120B, User Manual

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Using the Multi-Wavelength Meter
Measuring Laser Separation
2 Press List by WL.
3 Press the Delta On key.
Use the Off key to turn off the measurement.
4 Select the type of separation to observe:
•
Δ
WL displays channel separation.
•
Δ
WL /
Δ
PWR displays both channel separation and differences in power.
5 Use the and softkeys to select the reference laser line.
6 Press SELECT .
Press SELECT at any time to select a new reference. Press RESET at any time to turn
off the delta calculation.
Measuring flatness
You can use relative power measurements to measure flatness (pre-emphasis) in a
WDM system. Simply select one carrier as the reference and measure the remaining
carriers relative to the reference level. The power differences represent the system
flatness. Press
RESET to turn off the delta calculations so that all responses are
shown in absolute wavelength and powers.