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Resistance knowledge - metal film resistance
Date : 2024-07-25Source: Unknown
- Metal Film Resistors are one of the film resistors. It is the use of high temperature vacuum coating technology to nickel-chromium or similar alloy closely attached to the surface of the porcelain rod to form a skin film, after cutting and debugging resistance values, in order to achieve the final requirements of the precision resistance value, and then add appropriate joint cutting, and on its surface coated with epoxy resin seal protection.Because it is a lead type resistor, it is convenient for manual installation and maintenance, and is used in most household appliances, communications, and instruments.
Metal film resistors are resistors that use special metals or alloys as resistance materials, and use vacuum evaporation or sputtering methods to basically form a resistance film layer in ceramic or glass. This kind of resistor is generally made by vacuum evaporation process, that is, heating the alloy in vacuum, the alloy evaporates, so that a conductive metal film is formed on the surface of the porcelain rod. The resistance value can be controlled by grooving and changing the thickness of the metal film. Its thermal resistance, noise potential, temperature coefficient, voltage coefficient and other electrical properties are better than carbon film resistors.
The manufacturing process of metal film resistors is flexible, which can not only adjust its material composition and film thickness, but also adjust the resistance value by grooving, so it can be made into a good performance and a wide range of resistance values. Metal film resistors are widely used so far, with high precision, stable performance, simple and lightweight structure. In the electronics industry and high-precision requirements of military aerospace and other fields to play a non-negligible role.
Compared with carbon film resistance, this resistor has small size, low noise and good stability, but the cost is high, and it is often widely used as a precision and high stability resistor, and it is also commonly used in various radio electronic equipment. Performance parameter Temperature coefficient: ±100PPM/℃, large power load, small current noise, stable performance, high frequency performance, working temperature range: -55℃ ~ +155℃
