Chapter 3 PERFORMING MEASUREMENTS
3-31
Normal
This method is used to obtain a satisfactory trace when measuring a long optical fiber, by
dividing the measurement area into blocks and setting an appropriate attenuation for each
block.
Division of the measurement area into blocks and setting of an appropriate attenuation for
each block are carried out automatically by the instrument. So, measurement time will be
longer compared to the total average method.
Furthermore, since the attenuation is set based on the back scatter level at the near end, if
excessive reflection occurs in a block the trace for that block may be saturated.
This method is recommended when there is no excessive reflection in the optical
fiber to be measured.
For details on saturation of trace, refer to page 3-87.
Hi-Return
Like the division average method, this method is used to measure each block using the
attenuation set for each block. Instead of setting attenuation for each block using the back
scatter level at the near end, it is set based on the back scatter level at each block. As a
result, measurement time will be longer compared to the division average method.
Division of the measurement area into blocks and setting of an appropriate attenuation for
each block are carried out automatically by the instrument.
Each block is measured using own
attenuation.
There is a possibility
that this part of the
trace is saturated
depending on
r
fl
i
n l
v
l.
TIP
Refer
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