EXFO IQS-12002B Calibration System - Manual (Page 8)

Introducing the IQS-12002B Calibration System
4 IQS-12002B
Calibration and Verification: Assessing Conformity
Calibration Uncertainties
Calibration uncertainties are expressed in the certificate. It states the
combined uncertainties of the following factors:
³
Reference standard calibration uncertainty
³
Dependence of the reference standard on measurement conditions
³
Dependence of the tested meter on measurement conditions
³
Other uncertainties due to the setup and measurement method
As an example, for power meter absolute power calibration, the
dependence of the detector response at each point is evaluated for the
wavelength uncertainty of the source, output stability and output
bandwidth of the light, temperature uncertainty, connector-adapter
combination, fiber type, repeatability of the measurement, power meter
linearity, and other factors.
Guaranteed Specifications
Guaranteed specifications are EXFO's published specifications for the unit.
In fact, the calibration process foresees the possibility of making some
adjustments to ensure compliance. Written proof is given in the "As left"
section of the calibration certificate when the Within specifications box is
selected.
Allowed Deviation
The allowed deviation is the difference between the measurement of the
power meter under test and the reference standard; this is a key factor in
the determination of whether or not a unit conforms to its specifications.