Agilent Technologies Agilent 86120B, User Manual

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2-22
Using the Multi-Wavelength Meter
Measuring Laser Separation
To measure channel separation
1 Press the front-panel
Preset
key.
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:
•
∆
WL
displays channel separation.
•
∆
WL /
∆
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 rep-
resent the system flatness. Press
RESET to turn off the delta calculations so
that all responses are shown in absolute wavelength and powers.
To measure flatness
1 Press the front-panel Preset key.
2 Press List by Power .
This lists the input signals by power with the largest response listed first.
3 Press the Delta On key.
4 Select
∆
PWR .
5 Use the and softkeys to select the first laser line.
6 Press SELECT .
7 Since the largest power signal is the reference, the relative power
measurements for the other responses shows system flatness.