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5790A
Operators Manual
ground
The voltage reference point in a circuit. Earth ground is a connection through a ground
rod or other conductor to the earth, usually accessible through the ground conductor in an
ac power receptacle.
ground loop
Undesirable current induced when there is more than one chassis ground potential in a
system of instruments. Ground loops can be minimized by connecting all instruments in a
system to ground at one point.
guard
A floating shield around sensitive circuitry inside an instrument. The guard provides a
low-impedance path to ground for common-mode noise and ground currents, thereby
eliminating errors introduced by such interference.
International System of Units
Same as "SI System of Units"; the accepted system of units. See also "units," "base
units," and "derived units."
legal units
The highest echelon in a system of units, for example the 1990 SI volt.
life-cycle cost
The consideration of all elements contributing to the cost of an instrument throughout its
useful life. This includes initial purchase cost, service and maintenance cost, and the cost
of support equipment.
linearity
The relationship between two quantities when a change in the first quantity is directly
proportional to a change in the second quantity.
linearity error
Linearity error occurs when the true output vs. selected output response curve of a
calibrator is not exactly a straight line. You can measure this type of error by plotting the
response curve, then measuring how far the curve deviates from the straight line at
various points.
MAP (Measurement Assurance Program)
A program for a measurement process. A MAP provides information to demonstrate that
the total uncertainty of the measurements (data), including both random error and
systematic components of error relative to national or other designated standards is
quantified, and sufficiently small to meet requirements.
maximum transfer time
Maximum time that an ac-dc transfer can be made to stay within the stated ac-dc absolute
uncertainty.
metrology
The science of, and the field of knowledge concerned with measurement.
minimum V
For each range of an ac/ac transfer standard, the minimum input rms voltage for which
uncertainty specifications apply. Also see rms.
metrology
The science of, and the field of knowledge concerned with measurement.
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