1-26
IM AQ1210-01EN
2 way trace analysis
Waveform events that have been measured from optical fiber cable end A to end B and those
measured from end B to end A can be combined. This combination enables displaying of events
that could not otherwise be measured because of dead zones.
In the figure below, the event that is in the near-end dead zone (point S) when measured from end
A is detected as event number 5 when measured from end B. In the 2 way trace analysis display, it
is displayed as event number 1.
This
instrument
End A
End B
End A → End B
End A ← End B
▲
▲
▲
▲
▲
▲
S
1
2
3
4
E
This
instrument
▲
▲
▲
▲
▲
▲
S
1
2
3
4
E
5
▲
▲
▲
▲
▲
▲
S
1
2
3
4
E
5
2 way trace analysis
An event of the other waveform that exists within 6% of the position of an event of the current trace
will be considered part of the current trace event.
If multiple events of the other waveform that exists within 6% of the position of an event of the
current trace, the closest event will be considered part of the current trace event.
Waveforms that meet the following conditions can be combined.
• Both have the same wavelength.
• Both have the same pulse width.
• Their end position offset is within 6%.
• Both have event lists.
Differential Trace
You can load two waveforms that have been measured on the instrument 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)
Loss between
A
and
B
and between
C
and
D
• Distance to each marker
Distance between
A
and
B
and between
C
and
D
Trace 1
(Current trace)
Trace 2
(Differential trace)
(Trace 2) – (Trace 1)
The differential trace is the result of subtracting the values
of the current trace from the target trace.
You can perform marker analysis on the differential trace.
A
B
D
C
1.7 Application