3-9
IM AQ1200-01EN
Optical Pulse Measurement and
Analysis Conditions
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App
Index
20
Sample Interval
The maximum number of sample data points is 128000. The shortest sample interval is determined by
the distance range.
Normal: The Instrument uses the optimum sample interval for the measurement method to
perform measurements.
Hi-Resolution: The Instrument uses the shortest sample interval to perform measurements.
If you use a short sample interval, you can measure for finer changes. However, the data size of the
measured result becomes large. The sample intervals that you can select vary depending on the
distance range, as shown in the following table.
Distance Range
Selectable Sample Intervals
500 m
5 cm, 10 cm, 20 cm, 50 cm, 1 m
1 km
5 cm, 10 cm, 20 cm, 50 cm, 1 m, 2 m
2 km
5 cm, 10 cm, 20 cm, 50 cm, 1 m, 2 m, 4 m
5 km
10 cm, 20 cm, 50 cm, 1 m, 2 m, 4 m, 8 m
10 km
20 cm, 50 cm, 1 m, 2 m, 4 m, 8 m
20 km
50 cm, 1 m, 2 m, 4 m, 8 m, 16 m
50 km
1 m, 2 m, 4 m, 8 m, 16 m
100 km
1 m, 2 m, 4 m, 8 m, 16 m
200 km, 300 km
400 km, 512 km
4 m, 8 m, 16 m, 32 m
Average Method
Hi-Speed
In
Hi-Speed mode, all sections are measured according to the specified attenuation. If the specified
attenuation value is not appropriate and a large reflection occurs, the waveform for that section may
be saturated.
If reflections are large, the waveform
may be saturated.
Hi-Reflection
In
Hi-Reflection mode, the Instrument can perform measurements correctly even if large reflections
(excluding extremely large reflections caused by sections of the fiber such as the open end of
the fiber) occur. In Hi-Reflection mode, the Instrument sets the optimum attenuation according
to the backscattering light level for each section, and performs the measurement. Therefore,
the measurement time is longer than in Hi-Speed mode. The partitioning of the optical fiber into
sections and the specifying of the optimum attenuation are done automatically.
Note
We recommend that you use Hi-Speed mode when you are measuring a short optical fiber that has no
reflections.
Average Unit
Duration: Measurements are performed only over the specified duration. If you specify a short
duration, depending on the measurement conditions, measurements may not have finished
when the specified time elapses.
Times: Measurements are performed only the specified number of times.
3.5 Setting Measurement Conditions
