Atec Agilent-81618A - Manual (Page 26)

Specifications Definition of Terms
26
Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition
Return loss
The ratio of the incident power to the reflected power expressed in dB.
Symbol: RL.
Conditions: the return loss excludes any reflections from the fiber
end used as radiation source.
Spectral width of optical source
Full width at half maximum. The 3 dB width of the optical spectrum,
expressed in nm. Symbol: FWHM.
Total uncertainty
The uncertainty for a specified set of operating conditions, including
noise and drift.
Conditions: power level, beam diameter or fiber type, numerical
aperture, wavelength, spectral width, ambient temperature, re-
calibration period as specified.
→Noise and drift observed over a
specified observation time, with a temperature change of not more
than ±
∆T.
Uncertainty at reference conditions
The uncertainty for the specified set of reference conditions, including
all uncertainties in the calibration chain from the national laboratory
to the test meter.
Wavelength range
The range of wavelengths for which the power meter is calibrated.
Note: Selectable wavelength setting of the power meter for useful
power measurements (operating wavelength range).
Literature
[1]Fiber optic test and measurement, Hewlett Packard Professional
Books, edited by Prentice Hall, ISBN 0-13-534330-5
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