What is Calibration?
Calibration is the comparison of a measurement device (an unknown)
against an equal or better standard. A standard in a measurement is
considered the reference; it is the one in the comparison taken to be
the more correct of the two. One calibrates to find out how far the
unknown is from the standard.
A "typical" commercial calibration references a manufacturer's calibration
procedure and is performed with a reference standard at least four times more
accurate than the instrument under test.
Calibration is an insurance policy.
Some people consider calibration a necessary annoyance to keep the auditor
off their back. In fact, out of tolerance (OOT) instruments may give false
information leading to unreliable products, customer dissatisfaction and
increased warranty costs. In addition, OOT conditions may cause good products to
fail tests, which ultimately results in unnecessary rework costs and production
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