EXFO IQS-12002B Calibration System - Manual (Page 10)

Introducing the IQS-12002B Calibration System
6 IQS-12002B
Calibration and Verification: Assessing Conformity
Conformance Assessment of the Unit Status for a
Certificate Compliant with ISO 17025
The conformance assessment of the power unit status, upon reception,
requires a judgement on the compliance or non-compliance with
specifications. The result of this judgement depends on the allowed
deviation and on the gray zone introduced by calibration uncertainties. As a
consequence of this gray zone, it is not always possible to draw a firm
conclusion regarding the unit status when it is received from the customer.
Following the indications given by ISO/IEC 17025, EXFO provides, in the "As
found" section of the certificates, four conclusions depending on deviation,
guaranteed specifications (Spec), and calibration uncertainty (Ucal):
³
Inside specifications
When measured deviation is within the following limits, the unit is said
to be within specifications with a level of confidence of 95 %:
³
Inside specifications
When all results are within specification limits. In conformance with
ISO/IEC 17025, full compliance cannot be achieved because of
measurement uncertainties. Nevertheless, results indicate that the
instrument is likely to perform according to specifications. Results are
bound by the following limits:
deviation spec 0.825 Ucal • – ( ) ≤
spec 0.825 – Ucal ⋅ deviation < spec ≤