MM0499
i. Standard.
An item of known accuracy that is
established
by
authority as a basis for reference measurements (Figure 1).
(1) National reference standards.
Standards maintained by the
National Bureau of Standards (Gaithersburg, Maryland; and Boulder, Colorado)
that constitute the highest level of accuracy and the legal basis for
measurements in the United States.
(2) Primary reference standards.
The source of the most accurate
measurements within the Army calibration system, the accuracy of which is
known and stated.
These standards are certified by, or directly derived
from, the National Bureau of Standards and are housed in a controlled
environment.
(3) Primary transfer standards.
Those standards with accuracy
certified as a result of comparison to primary reference standards. They
are used to certify the accuracy of subordinate standards.
(4) Secondary reference standards.
Those standards with accuracy
certified as a result of comparison to primary standards. They are used to
certify the accuracy of subordinate standards and are housed in a controlled
environment.
(5) Secondary transfer standards.
Those standards with accuracy
certified as a result of comparison to secondary reference standards. They
are used to certify the accuracy of Test, Measurement, and Diagnostic
Equipment (TMDE).
(6) Local standards.
Standards of various levels, with accuracies
certified by higher level standards, that are established by installations
or appropriate authorities for reference purposes in support of local
operations and assigned missions.
j. Test, measurement, and diagnostic equipment (TMDE).
Those devices
that are used to measure the characteristics or conditions of materiel.
(1) Special-purpose test and measurement equipment.
Test and
measuring equipment, designed for, and applicable to, a specific end item,
component, or select group thereof.
(2) General purpose test and measurement equipment.
Test and
measuring equipment, usually of commercial design, having universal
application without limitation as to specific commodity, item, or component.
k. Audit package. A package containing standards that are forwarded to
a calibration facility where calibration is performed under
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