EXFO IQS-12002B Calibration System - Manual (Page 11)

Introducing the IQS-12002B Calibration System
Calibration System 7
Calibration and Verification: Assessing Conformity
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Outside specifications
When some results are outside specification limits. Nevertheless,
non compliance cannot be established because of measurement
uncertainties. Results are bound by the following limits:
When one of the two first conclusions applies to the unit under test, it is up
to you to determine if measurements taken with that unit, before
verification, are considered valid. This depends on the following:
Whether a deviation outside published specifications can be tolerated
for these measurements.
The proximity of the measurements, taken with the unit, to the
maximum allowed deviation.
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Outside specifications
The unit is definitely not within specifications. The deviation is larger
than the sum of the specification and the calibration uncertainty.
For example, for power meter models whose specification and
calibration uncertainties are respectively ±5 % and ±3.1 % (at
1550 nm), the deviation will allow us to conclude the following:
Inside specifications
Inside specifications*
spec deviation < spec ≤ 0.825 + Ucal ⋅
deviation spec > 0.825 + Ucal ⋅
deviation 2.5 % ≤
2.5 % deviation < 5 % ≤