Resistance of resistor changes with temperature; and TCR stands for temperature coefficient of resistance, which indicates that when temperature changes by 1℃, the relative change of resistance in ppm/℃. Resistance will return to initial value with temperature returns to normal temperature. Calculation formula:
Where:
R1： Resistance (Ω) measured under room temperature
R2： Resistance (Ω) measured at -55℃ or +125℃
T1： Room temperature.
T2： -55℃ or +125℃