
C Specifications Definition of Terms / Measurement Conditions
202 E6000C Mini-OTDR User’s Guide, E0302
Measurement: Connect a long fiber, for example 50 km, to
the OTDR and calculate the 1 dB loss error as follows.
Generate two undisturbed backscatter traces with a 1 dB
vertical difference. Measure this difference, A
OTDR
, along
the length of the fiber. Also, measure the power
difference, A, with a calibrated optical power meter.
Calculate the loss errors along the length of the fiber and
determine the maximum within specified power range as
in the formula above. See Figure 6.
Loss accuracy, reflectance measurements
The maximum difference between the reflectance of an
event as measured with the OTDR and the actual
reflectance of the event.
0
Distance
Loss error =
A
-
A
otdr
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