1-14
IM AQ7280-01EN
Differential Trace
You can load two waveforms that have been measured on the AQ7280 and display their difference as
a waveform.
The screen can display the loaded waveforms and the differential trace simultaneously.
The differential trace is the result of subtracting the values of the current trace from those of the other
trace.
You can use markers to read the following values of the differential trace.
• Loss between markers (dB)
• Distance between markers (km)
• Loss per unit distance between markers (dB/km)
• Distance to each marker
Section Analysis
You can set two markers, start point S and end point E, to measure the return loss and total loss in the
section that you have specified. By setting reference point B, you can calculate the return loss using
the backscatter level you specify.
S
E
B
Event Analysis
You can search for events in the optical pulse measurement waveform and measure the splice loss
and the return loss.
Editing Events
You can insert and delete events on the event screen. When you edit an event marker, the splice loss
and the return loss can be recalculated.
S
1
2
E
E
E
E
Measurement
reference point
Event number 1
Event number 2
Event E detected
as the end of fiber
Editing Event Lists
You can set indices of refraction for each event period on the event list. Setting the indices of refraction
in accordance with the connected optical fiber cable makes accurate distance measurements possible.
These indices only affect event analysis. The do not affect the waveform display.
You can also change event distances. However, the events shown on the screen will not change.
1.4 Optical Pulse Analysis