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The Characteristic Of The Resistors
Sep 12, 2017

Abstract: In physics, the resistance is a property of the conductor itself, indicating the size of the conductor against the current obstruction. In daily life, people often use resistive elements, mainly because it presents a hinder the current, and the nature of energy consumption. However, the resistance of the classification, nature, labeling methods, and how to choose people know little about it. This article in response to the above problems, made a comprehensive system to help people out of the blind, scientific and safe use of resistance. Keywords: resistance of the classification of the nature of the resistance of the resistance method of the selection of resistance standards First, the resistance of the classification 

  1. Thin film type in the glass or ceramic substrate deposition of a layer of carbon film, metal film, metal oxide film to form a resistive film, the film thickness is generally below a few microns. (1) metal film resistance (model: RJ). On the surface of the ceramic skeleton, a layer of metal film or alloy film is deposited by evaporation or vacuum deposition. Its characteristics are: high precision, good stability, low noise, small size, high frequency characteristics. (-55 ~ + 125 ℃), the temperature coefficient is low ((50 ~ 100) × 10-6 / ℃). Is currently one of the most widely used resistors in the production of electronic circuits. Common rated power of 1 / 8W, 1 / 4W, 1 / 2W, 1W, 2W, the nominal resistance between 10W ~ 10MW. (2) metal oxide film resistance (model: RY). In the glass, porcelain and other materials, through the high temperature in the form of chemical reactions to tin oxide as the main body of the metal oxide layer. The resistor because the oxide film layer is relatively thick, which has excellent pulse, high frequency and overload performance, and wear, corrosion resistance, chemical stability. But the resistance range is narrow, the temperature coefficient is worse than the metal film resistance. (3) carbon film resistors (model: RT). On the surface of the ceramic skeleton, the hydrocarbon is decomposed into a carbon crystalline conductive film by vacuum evaporation in a vacuum. Carbon film resistance is low price, wide range of resistance (10W ~ 10MW), the temperature coefficient is negative. Common rated power of 1 / 8W ~ 10W, accuracy level of ± 5%, ± 10%, ± 20%, in the general use of large quantities of electronic products.

  2.  Alloy type with a block resistive alloy drawn into alloy wire or rolled into alloy foil made of resistance, including: (1) wirewound resistance (model: RX). The Kang copper wire or nickel-chromium alloy wire wound on the tube, and its outer layer coated with enamel or glass glaze to be protected. Wirewound resistors with high stability, high precision, high power and so on. Temperature coefficient can be done less than 10-6 / ℃, accuracy higher than ± 0.01%, the maximum power up to 200W. But the shortcomings of wirewound resistors are their own inductors and distributed capacitance is relatively large, not suitable for use in high-frequency circuits. (2) precision alloy foil resistance (model: RJ). In the glass substrate adhesion of an alloy foil, photolithography etching a certain pattern, and coated with epoxy protective layer, the formation of lead packaging. The biggest characteristic of the resistor is the automatic compensation resistor temperature coefficient function, so the high precision, good stability, high frequency response. The accuracy of this resistance can reach ± 0.001%, the stability of ± 5 × 10-4% / year, the temperature coefficient of ± 10-6 / ℃. It can be seen that it is a high-precision resistance.

  3. Synthetic class will be conductive materials and non-conductive materials according to a certain proportion of mixed into a different resistivity of the material after the resistance. The most prominent advantage of this resistance is the high reliability, but the electrical performance is relatively poor. Often used in certain special areas (such as aerospace industry, submarine cables, etc.). Synthetic class resistance type is more, according to the purpose can be divided into general type, high resistance type and high pressure type. (1) metal glass glaze resistance (model: RI). An inorganic material is used as a binder to form a resistive film on a ceramic substrate by a printing sintering process. The resistance has a high heat resistance and moisture resistance, commonly used it made of miniaturized chip resistors. (2) solid core resistance (model: RS). With organic resin and toner synthesis resistivity of different materials after hot pressing. The volume of the same power of the metal film resistance, but the noise than the metal film resistance. Resistance range of 4.7W ~ 22MW, accuracy level of ± 5%, ± 10%, ± 20%. (3) Synthetic film resistance (RH). Synthetic film resistors can be made of high pressure and high resistance type. High resistance type resistance range of 10MW ~ 106MW, the allowable error of ± 5%, ± 10%. High resistance type resistance range of 47MW ~ 1000MW, pressure breakdown 10kV and 35kV two blocks.