Fluke 5700A Series II Operator's Manual page 323

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 5700A/5720A Series II, however,
range and scale are identical.
range calibration
An optional calibration procedure available to the enhance the 5700A/5720A Series II
specifications by nulling the output to an external standard.
reference amplifier
DC voltage references developed for the 5700A/5720A Series II. 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 uncertainty
5700A/5720A Series II uncertainty 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.
D
Appendices
Glossary
D-7