Keysight Technologies 86120B, User Manual

Page: 55 / 273

53
Using the Multi-Wavelength Meter
Defining Laser-Line Peaks
Examples of valid
and invalid signals In the following figure, three laser lines are identified: responses 1, 3, and 4.
Response ¡ is not identified because it is below the peak threshold. The portion of
each signal that is within the peak excursion limits is shown in bold lines.
Because of the peak excursion rule, responses 4 and 5 are identified as one laser
line—the minimum point between 4 and 5 does not drop to the peak excursion limit.
This response has the highest power shown which is peak 4.
Whenever the peak threshold limit or peak excursion value is changed, the new lim-
its are applied to the current displayed measurements even if the instrument is in the
Single measurement mode.
The following figure shows the same laser lines as the previous figure, but the peak-
excursion value has been changed from 15 to 3 dB. Four laser lines are now identi-
fied with responses Ð and ƒ identified as two distinct laser lines.