Calibration Terms
Out of Tolerance Conditions:
If the results are outside of the instrument's performance specifications it is considered an OOT (Out of Tolerance) 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).
TUR - Test Uncertainty Ratio:
The
ratio of the accuracy of the instrument under test
compared to the accuracy of the reference standard.
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