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OCC-CWDM-301-18
Note
After a certain period of time, the trace displays on the GUI. The trace in the Figure below is a trace during
measurement, which will be refreshed for every certain period of time to demonstrate the whole process to users
in real time. But at the end of measurement, the trace will be final, as shown in Figure 4-4.
Figure 4-4. Trace Measurement of OTDR
4.2.4 Trace Measurement - Manual
If the operators have full knowledge of measured optic fiber, they can set accurate parameters, and achieve
optimal measurement results.
•
Change “range”: Refer to 3.4.3.2.2 range configuration to select adequate range
•
Measure
:
Press [
] to start measurement. The process is the same with Auto measurement
4.2.5 Trace Measurement -Reasons of Measurement Failures
If measurement failures occur, reasons may be one of the following:
•
Events may be too close to each other
Shorten the pulse width, and make another try. If failure still occurs, please try to measure at the other end
of the optic fiber
•
Low SNR
Try to use wider pulse or increase average time, and make another try
•
Incorrect parameter configuration
Check parameter configuration, and make another try
N o.: 2/4
A t t n.: 0. 220
L oc a t i on: 25.308 km
R e f l .: -38 .12dB
I ns .L.: 0. 85dB
Cum .L.: 5. 57dB
8K m /D i v
5. 00dB /D i v
t ra c e1
E ve nt
B
A