Metrological Drift in Precision Bulk Metal Foil Resistors
Bulk metal foil resistor drift stems from thermal stress relaxation and epoxy moisture swelling, manageable through hermetic packaging and thermal burn-in.
IEC 60115 1
Technical Specification
Technical specifications for fixed resistors used in electronic equipment provide the foundation for international component qualification. The document iec 60115 1 establishes uniform requirements for testing and quality assessment across different resistor technologies. It defines the terminology and methods used to evaluate parameters such as temperature coefficient and voltage rating.
This text acts as the master framework for more specific detail specifications in the series.
Test Protocol
Standardized testing procedures ensure that results are comparable across different laboratories and manufacturers. Compliance with iec 60115 1 requires resistors to undergo various environmental and mechanical stresses, including vibration, humidity and thermal shock. Each test is described with specific durations and intensities to provide a reproducible baseline for performance.
The resulting data allow engineers to select components that can survive the intended operating conditions.
Stability Classification
Performance requirements are categorized into different classes based on the allowable shift in resistance over time. Manufacturers assign a stability class as defined by iec 60115 1 to indicate how much the value will change after long-term endurance tests at maximum power. This classification system helps designers determine if a part will maintain the necessary precision for the life of the circuit.
Higher classes demand more sophisticated materials and manufacturing processes.
Procurement Utility
Component procurement relies on standardized definitions to ensure that parts from different vendors meet the same quality levels. Reference to iec 60115 1 allows a buyer to verify that a supplier has performed the necessary validation on their product line. This alignment reduces the risk of field failures due to unanticipated material weaknesses.
It is the primary reference for drafting purchase specifications in the electronics industry.