Thermal Coefficients and Hysteresis in Precision Resistance Elements
Matching element strain coefficients to substrate thermal expansion eliminates thermal hysteresis and holds sub-ppm resistance stability across operational temperature bands.
Mil Prf 55424
Procurement Specification
Performance requirements for semi-rigid pressure transducers are established by the United States Department of Defense. Mil prf 55424 defines the environmental and electrical testing protocols for sensors used in aerospace systems. It covers devices that measure absolute, gauge or differential pressure.
Qualification Testing
Requirements include resistance to vibration, shock and extreme temperature cycling. A device compliant with mil prf 55424 must maintain its accuracy after exposure to salt spray and electromagnetic interference.
Metrological Rigor
Calibration data must be traceable to national standards and include error analysis. Under mil prf 55424, the manufacturer must demonstrate that the sensor output remains within the specified tolerance band throughout its service life.
Documentation Evidence
Certification requires a complete record of the manufacturing and testing history for each serial number. Units failing any part of the mil prf 55424 protocol are permanently rejected from military use. This standard ensures that flight systems receive reliable data in harsh conditions.
Quality audits occur annually to verify that the laboratory equipment and the testing procedures continue to meet the requirements of the specification. The final data package includes the results of the stability tests and the thermal drift characterization for every unit in the lot.