C Specifications Definition of Terms / Measurement Conditions
194 E6000C Mini-OTDR User’s Guide, E0302
Conditions: Continuous fiber with no discrete losses, for a
power range from the beginning of the backscatter signal
to the point where the specified
→signal-to-noise ratio is
reached, at specified instrument settings.
Center wavelength
The center wavelength is defined as the spectral center of
gravity, at specified operating conditions:
where:
P
i
= power levels of the individual longitudinal lines
λ
i
= wavelengths of the individual longitudinal lines
Distance accuracy
The largest error of the OTDR’s distance measurement
result.
Conditions: Generally, all distance accuracy specifications
apply to reflective events only. For non-reflective events,
an increased uncertainty applies because of the difficulty
of locating the event precisely.
NOTE Based on the IEC error model, the distance error depends
on the distance and is given by the absolute value of the
sum of three quantities.
:
where
L = actual (true) distance
∆L
0
= distance offset error
∑
∑
=
i
ii
c
P
P
λ
λ
()
RLSLLL
L
∆+⋅∆+∆±=∆
0
)(
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