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Glossary of AC-DC Transfer Related
Absolute Uncertainty
Uncertainty that includes contributions from all sources, i.e., treability to national
standards of the standards used, plus the uncertainty of the measurement process.
Absolute uncertainty should be used to compute test uncertainty ratio. Also see "relative
uncertainty".
Accury
The degree to which the measured value of a quantity agrees with the cepted, consensus,
or true value of that quantity. Accury is the same as 1 - % uncertainty. For example, an
instrument specified to 1 % uncertainty is 99 % curate. Also see "uncertainty".
Artift Calibration
An instrument calibration technique that uses a calibration system within the instrument
to reduce the number of required external standards to a small number of artift standards.
The Fluke 5700A Calibrator uses Artift Calibration.
Artift Standard
A stable object that produces or embodies a physical quantity for use as a reference
standard. An artift standard may have an assigned treable value when used for calibration
purposes. Fluke 732A DC Voltage Reference Standard and the Fluke 742A Series
Standard Resistors are examples. Also see "transfer standard".
AC-DC Absolute Uncertainty
Includes all known error sources contributing to the uncertainty of an AC-DC difference
correction. This includes NIST (National Institute of Standards and Technology)
uncertainties, transfer uncertainty from a primary standard to working standard, and
internal error contributions (both random and temperature related).
Appendix A
Terms
A-1
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