MIL-HDBK-1839 Calibration and Measurement RequirementsThis information and interpretive guidance provided by this handbook are intended to clarify the requirements invoked by Mil-Std-1839. This handbook is for guidance only. this handbook cannot be cited as a requirement. If it is, the contractor does not have to comply.

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MIL-HDBK-1839A

5. DETAILED REQUIREMENTS

5.1 System, subsystem, and equipment measurement parameters.

"5.1.1 Assessment of parameters. The design activity shall assess all system, subsystem, and equipment parameters that require measuring or testing to ensure proper system or equipment operation and accuracy, and to ensure intended mission goals are met."

Interpretive guidance: The measurements and tests are made and/or performed to ensure that the system performs in accordance with its intended use.

"5.1.1.1 Sequence of relationship. This assessment of parameters shall portray the logical sequence of relationship within and between the system, subsystem, and equipment, and identify the parameters requiring measurement and verification.

a. System parameters require measurement and verification to ensure proper operation of the system so the mission requirements of the system can be accomplished.

b. Subsystem parameters require test and measurement to ensure interchangeability and proper operation of the subsystem when integrated into the complete system.

c. Equipment parameters require test and measurement to ensure interchangeability and proper operation of the equipment when used as part of or connected with the system or subsystem."

Interpretive guidance: Occasionally it is beneficial to the developer and/or the reviewer of the CMRS to develop a pictorial view of the parametric flow. A flow chart, with the subsystem parameters mapped to the system parameters, mapped to the SE parameters, mapped to either the appropriate service's approved calibration procedure or the calibration standards, mapped to the national standards or a physical constant. Generally, the parametric mapping (i.e. traceability) will be satisfied with either an appropriate service's approved calibration procedure or to a first tier calibration standard which has an approved procedure. Rarely does the parametric map have to document a flow to the national standards or a physical constant. The parameters required for interchangeability necessary to be documented will be driven down to the lowest level of repair documented in the LSA where measurements are required.

"5.1.1.2 Selecting TMDE. This assessment of parameters shall be used by the design activity during the evaluation process for recommending or selecting TMDE and developing support documentation."