Metal film resistance is the use of nickel-chromium or similar alloy vacuum plating technology, the film on the white porcelain rod surface, after cutting debugging resistance, in order to achieve the final requirements of precision resistance. Metal film resistors provide a wide range of resistance values, with precision resistance, small tolerances. Can also be applied to metal film fuse resistors. The carbon film resistance is the largest use of electronic, electrical appliances, information products, the cheapest price, high quality and reliability of the trust. It is from the high temperature vacuum separation of organic compounds of carbon, closely attached to the surface of the porcelain bar carbon film body, and appropriate adapters after cutting adapted, and coated with epoxy resin in its surface to protect. Carbon Film Resistance In appearance, the metal film has five rings (1%) and the carbon film has four rings (5%). The metal film is blue, the carbon film is khaki or other colors. (Miniature resistance in the past is based on the color difference between the national standard, the metal film resistors with red, carbon film resistors with green.) However, due to the improvement of technology and the emergence of fake gold film, these two methods are not very good, often can not distinguish These two kinds of resistance.
The better way is the following two:
1. Scratch the protective paint with a blade, the exposed film color is black for the carbon film resistance; film color is bright white metal film resistance.
2. Since the temperature coefficient of the metal film resistor is much smaller than that of the carbon film resistor, the resistance of the resistor can be measured with a multimeter, and then the resistance is approached by the hot ferrochromium. If the resistance value changes greatly, the carbon film resistor , Otherwise the metal film resistors.
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