Long-Term Drift Resistance in High Precision Metal Film Resistors
Introduction
High precision metal film resistors are renowned for their ability to maintain accurate resistance values over extended periods. The characteristic of long - term drift resistance is a key factor that sets them apart from other resistor types and makes them indispensable in many critical applications.
What is Long - Term Drift Resistance?
Long - term drift refers to the gradual change in the resistance value of a resistor over time. In high precision metal film resistors, this drift is minimized due to their unique construction and material properties. The metal film used in these resistors is carefully deposited onto a substrate, usually ceramic or glass. The film is composed of alloys such as nickel - chromium, which have been selected for their stability.
During the manufacturing process, the metal film is precisely controlled in terms of thickness and uniformity. This precision ensures that the initial resistance value is accurate and that the potential for drift over time is reduced. The manufacturing also involves annealing processes that relieve internal stresses within the metal film, further enhancing its stability.
Importance of Long - Term Drift Resistance
How is Long - Term Drift Resistance Measured?
Long - term drift resistance is typically measured by subjecting the resistors to accelerated life - testing conditions. Resistors are placed in an environmental chamber with controlled temperature and humidity. Over a period of months or years, their resistance values are periodically measured and compared to the initial values. The rate of change in resistance, usually expressed as a percentage per year or per thousand hours of operation, is used to quantify the long - term drift resistance.
In conclusion, the long - term drift resistance of high precision metal film resistors is a crucial property that enables their use in a wide range of applications where accuracy and stability are of the utmost importance. Their ability to maintain resistance values over time ensures the reliable operation of precision instruments, industrial control systems, and telecommunication equipment, among others.
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