Calibration Terms
Out of Tolerance (OOT) Condition
If results are outside of the instrument's performance specifications
it is considered an Out of Tolerance (OOT) condition and will result in
the need to adjust the instrument back into specification.
Optimization
Adjusting a measuring instrument to make it more accurate is NOT part of a
"typical" calibration and is frequently referred to as "optimizing" or "nominalizing"
an instrument. (This is a common misconception) Only reputable and experienced
calibration providers should be trusted to make adjustments on critical test
equipment.
As Found Data
The reading of the instrument before it is adjusted.
As Left Data
The reading of the instrument after adjustment or "same as found" if no
adjustment was made.
Without Data
Most calibration labs charge more to provide the certificate with data and
will offer a "no-data" option. In any case "as-found," data must be provided for
any OOT condition.
Limited Calibration
Sometimes certain functions of an instrument may not be needed by the user.
It may be more cost effective to have a limited calibration performed. (This can
even include a reduced accuracy calibration.)
Test Uncertainty Ratio (TUR)
The ratio of the accuracy of the instrument under test compared to the
accuracy of the reference standard.
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