Comparison of Accuracy between Manganese Copper Alloy Resistors and Copper Alloy Resistors at High Temperatures

Manganese copper alloy resistors and constantan alloy resistors both have excellent accuracy performance at high temperatures, but each has its own characteristics. The following is a detailed analysis of the accuracy of these two alloy resistors at high temperatures:
Manganese copper alloy resistor

High precision characteristics: Manganese copper alloy resistors are known for their high precision, which can still be maintained at high temperatures. The temperature coefficient of resistance of manganese copper alloy is extremely low, and even in high temperature environments, the change in resistance value is relatively small, ensuring the accuracy of the resistor.
Thermal stability: Manganese copper alloy resistors have good thermal stability at high temperatures, which means that their resistance values change less when the temperature rises, which is beneficial for maintaining the stability and accuracy of the circuit.

Copper alloy resistor

Resistance temperature stability: Copper alloy resistors also exhibit good resistance temperature stability at high temperatures. Although its temperature coefficient of resistance may be slightly higher than that of manganese copper alloy resistance, in many applications, this difference does not have a significant impact on accuracy.
The influence of oxidation resistance on accuracy: Chromium element in constantan alloy helps to form a dense oxide film and improve oxidation resistance. At high temperatures, this anti-oxidation performance helps reduce the resistance value changes caused by oxidation of resistors, thereby maintaining accuracy.

summary
Manganese copper alloy resistors and constantan alloy resistors can maintain high accuracy at high temperatures. Manganese copper alloy resistors are known for their extremely low temperature coefficient of resistance and high thermal stability, making them particularly suitable for applications that require high precision and high-temperature stability. Although the temperature coefficient of resistance of copper alloy resistors is slightly higher, their excellent oxidation resistance and resistance temperature stability can also meet the needs of many high-temperature applications. When selecting resistors, comprehensive consideration should be given to specific application scenarios, temperature ranges, accuracy requirements, and costs.
It is worth noting that although both types of alloy resistors can maintain high accuracy at high temperatures, their accuracy may be affected to some extent under extreme high temperature or long-term high temperature working conditions. Therefore, in practical applications, regular calibration and maintenance are required according to specific situations to ensure the long-term stability and accuracy of resistors.