MIL-HDBK-1839A
"b. A TUR of 4 to 1 is not required when the TMDE only provides input stimuli which are not used to characterize performance of the operational equipment or other TMDE. In this case, a minimum TUR of 1 to 1 is acceptable."
Interpretive guidance: A TUR of 1 to 1 is acceptable between the system and an item of support equipment only when the system requires an input, stimulus, or applied value for establishing test conditions and the system itself does not measure the applied parameters or characterize its own performance. Examples of acceptable 1 to 1 TURs are input/supplied torque applications, electrical stimuli signals, and pressure inputs. A minimum TUR of 1 to 1 only applies between the system and the SE. It does not apply between SE and calibration equipment. A 4 to 1 TUR is desired when
the system measures an applied/input parameter and the results determine pass/fail status or the systems performance is characterized.
5.4.4 Automatic Test Equipment.
"5.4.4.1 ATE design. The ATE performance specifications shall be more accurate than the system or equipment operational requirements (see 5.4.3)."
Interpretive guidance: Consider the requiring system specifications and establish ATE specification based on the actual requirements.
"5.4.4.2 ATE technical description.
a. The design activity shall assess the complete measurement and stimuli capabilities that can be made available at the ATE UUT interface."
Interpretative guidance: Navy document NAVAIR 17-35TR-2 "Technical Requirements for Automatic Test Equipment Calibration Requirements Analysis (CRA)" provides guidance on conducting a calibration requirements analysis on ATE. This reference provides insight into various aspects of calibration requirements involving ATE. It also discusses the approach to CMRS development when the ATE is built with no specific weapon system identified.
"b. The design activityshall determine the subset of ATE capabilities actually used for UUT
testing."
Interpretive guidance: The design activity should consider other applications of this ATE prior to tailoring of the calibration requirements of the ATE to fit the UUT requirements under consideration. In other words, consider the entire requirement and do not unnecessarily limit the ATE performance (specification) that is required for other, more capable systems. Alternatively, it is also necessary to consider the opposite scenario where the ATE is developed for a peculiar application and (appropriately) derated to support the use requirement. If a new UUT requirement arises which is more capable (but within the true capability of the ATE), the new requirement will provide for upgrading the calibration of the new bench.
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