5502A
Operators Manual
A-4
life-cycle cost
The consideration of all elements that contribute to the cost of an instrument through 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 is the first quantity is directly
proportional to a change in the second quantity.
linearity error
Linearity error occurs when the response curve of a meter is not exactly a straight line.
This type of error is measured by fixing two points on the response curve, drawing a line
through the points, then measuring how far the curve deviates from the straight line at
different points in the response curve.
MAP (Measurement Assurance Program)
A program for measurement process. A MAP provides information to demonstrate that
the total uncertainty of the measurements (data), that includes random error and
systematic components of error relative to national or other designated standards is
quantified, and sufficiently small to meet requirements.
MTBF (Mean Time Between Failures)
The time interval in operating hours that can be expected between failure of equipment.
MTBF can be calculated from direct observation or mathematically derived through
extrapolation.
MTTF (Mean Time To Fail)
The time interval in operating hours that can be expected until the first failure of
equipment. MTTF can be calculated from direct observation or mathematically derived
through extrapolation.
MTTR (Mean Time to Repair)
The average time in hours necessary to repair failed equipment.
metrology
The science of, and the field of knowledge concerned with measurement.
minimum use specifications
A compilation of specifications that satisfies the calibration requirements of a
measurement system or device. The minimum use specifications are usually determined
by maintaining a specified test uncertainty ratio between the calibration equipment and
the unit under test.
noise
A signal that contains no useful information that is superimposed on a necessary or
expected signal.
normal mode noise
An undesired signal that shows between the terminals of a device.
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