User`s guide

Definition of Terms / Measurement Conditions CSpecifications
E6000C Mini-OTDR User’s Guide, E0302
203
Conditions: Correct backscatter coefficient for the fiber
under test entered into the OTDR prior to measurement,
undisturbed backscatter trace in front of the reflectance
under test, for a given reflectance range and 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
Noise level (98%)
The displayed power level such that 98% of the noise data
points lie below this level.
Conditions: Noise data points from locations after which
the OTDR receiver response disappears in random noise.
NOTE This definition is needed to relate the
→noise level (RMS)
to practical measurements.
Noise level (RMS)
The displayed level which corresponds to + one standard
deviation of the linear noise amplitude statistics.
Conditions: Noise data points from locations after which
the OTDR receiver response disappears in random noise.
NOTE For purely Gaussian noise statistics, the noise level (RMS)
is approximately 1.9 dB below the
→noise level (98%).
Output power (CW)
The attainable optical output power in CW mode.
Conditions: Jumper fiber attached to the OTDR port;
output power measured with an optical power meter at
the end of the jumper fiber.