Agilent Technologies 6002A Guia do Utilizador descarregar pdf (Página 194)

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:

= power levels of the individual longitudinal lines

= 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

= distance offset error

∑

()

RLSLLL

∆+⋅∆+∆±=∆

)(

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Agilent Technologies 6002A Guia do Utilizador Página 194