Fluke Calibration 5730A Operator's Manual page 256

5730A
Operators Manual
random error
Any error which varies in an unpredictable manner in absolute value and in sign when
measurements of the same value of a quantity are made under effectively identical
conditions.
range
The stated upper end of a measurement device's span. Usually, however, a measurement
device can measure quantities for a specified percentage overrange. (The absolute span
including overrange capability is called "scale.") In the Calibrator, however, range and
scale are identical.
range calibration
An optional calibration procedure available to the enhance the Calibrator specifications
by nulling the output to an external standard.
reference amplifier
DC voltage references developed for the Calibrator. These are 6.5V hybrid devices
consisting of a zener diode and a transistor on a heated substrate. These reference
amplifiers exhibit extremely low uncertainty and drift, and are superior to zener diode or
temperature-compensated zener diode voltage references.
reference standard
The highest-echelon standard in a laboratory; the standard that is used to maintain
working standards that are used in routine calibration and comparison procedures.
relative accuracy
Calibrator accuracy specifications that exclude the effects of external dividers and
standards, for use when range constants are adjusted. Relative uncertainty includes only
the stability, temperature coefficient, noise, and linearity specifications of the Calibrator
itself.
reliability
A measure of the "uptime" of an instrument.
repeatability
The degree of agreement among independent measurements of a quantity under the same
conditions. (Same as "precision.")
resistance
A property of a conductor that determines the amount of current that will flow when a
given amount of voltage exists across the conductor. Resistance is measured in ohms.
One ohm is the resistance through which one volt of potential will cause one ampere of
current to flow.
resolution
The smallest change in quantity that can be detected by a measurement system or device.
For a given parameter, resolution is the smallest increment that can be measured,
generated or displayed.
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