Section 10 of ASTM B267 covers the temperature coefficient of resistance test for wire-wound resistor wire. This measures how the resistance of the alloy wire changes with temperature.
The mean temperature coefficient of resistance (TCR) is a critical property for precision resistor applications. Different alloy classes have different TCR values, which determine the stability of the resistance value over the operating temperature range.
Low TCR alloys are preferred for precision applications where resistance stability across a wide temperature range is essential.