The color ring resistance identification method refers to the use of four color rings or five color rings or six color rings to represent the resistance value. The color information representing the resistance value can be read at one time from any angle.
application
The color ring indicates that the main type of cylindrical resistor is used, such as carbon film resistor, metal film resistor, metal oxide film resistor, fuse resistor, and wirewound resistor.
Recognition order
Color ring resistance is the most common type of resistor used in various electronic devices. No matter how it is installed, the repairer can easily read the resistance value for easy detection and replacement. However, in practice, it has been found that some color ring resistors are not clearly arranged in order, and are often easy to read. In recognition, the following techniques can be used to judge:
Tip 1: First find the color ring of the mark error, and then arrange the color ring order. The most commonly used colors for resistance errors are: gold, silver, brown, especially gold rings and silver rings, which are rarely used as the first ring of the resistance color ring, so as long as there are gold rings and silver rings in the resistance, It can be basically assumed that this is the last ring of the color ring resistance.
Tip 2: Whether the brown ring is the discriminant of the error sign. The brown ring is often used as an error loop, and often as an effective digital ring, and often appears in both the first ring and the last ring, making it difficult to identify who is the first ring. In practice, it can be discriminated according to the interval between the color rings: for example, for the resistance of a five-color ring, the interval between the fifth ring and the fourth ring is smaller than the interval between the first ring and the second ring. To be wider, it is possible to determine the order in which the color rings are arranged.
Tip 3: In the case where the color circle interval cannot be determined by the color circle spacing alone, the production sequence value of the resistor can also be used for discrimination. For example, the color ring reading order of a resistor is: brown, black, black, yellow, brown, and its value is: 100×10000=1MΩ, the error is 1%, which belongs to the normal resistance series value. If it is reverse order reading: brown, yellow , black, black, brown, the value is 140 × 1 Ω = 140 Ω, the error is 1%. Obviously, the resistance values ​​read out in the latter order are not found in the production series of resistors, so the latter color ring sequence is incorrect.
recognition methods
In the early days, when the surface of the resistor was not sufficient for digital representation, the color ring mark method was used to indicate the resistance, tolerance, and specification of the resistor. Mainly divided into two parts.
The first part: a group close to the front end of the resistor is used to indicate the resistance.
The resistance of the two significant digits is represented by the first three color circles, such as 39Ω, 39KΩ, and 39MΩ.
The resistance of the three significant digits is represented by the first four color rings, such as 69.8Ω, 698Ω, and 69.8KΩ, which are generally used for the representation of precision resistors.
Part 2: A color ring near the back end of the resistor is used to represent tolerance accuracy.
Each color ring of the first part is equidistant, self-contained, and is easily distinguished from the color ring of the second part.
Tricolor ring resistance
The first color circle is a tens digit, the second color circle is a single digit, and the third color circle represents a magnification. Use the first three color rings to represent their resistance values, such as: 39Ω, 39KΩ, 39MΩ.
Four color ring resistor
Identification of four color ring resistors: the first and second rings represent the resistance of two significant digits; the third ring represents the magnification; and the fourth ring represents the error.
example:
Brown red gold
Its resistance is 12×10^2=1.2kΩ and the error is ±5%.
The error indicates the value of the resistance. Fluctuating above the standard value of 1200 (5% × 1200) indicates that the resistance is acceptable, that is, a good resistance between 1140-1260.
The first and second rings with four color rings represent the first two digits of the resistance; the third ring represents the magnification; the fourth ring represents the error. The key to rapid identification is to determine the resistance value within a certain order of magnitude according to the color of the third ring, for example, a few K or a few tens of K, and then enter the number read by the first two rings. This will allow you to read the numbers very quickly.
Five-color ring resistance
Identification of five color ring resistances: the first, second and third rings respectively represent the resistance of three significant digits; the fourth ring represents the magnification; the fifth ring represents the error. If the fifth color ring is black, it is generally used to represent a wirewound resistor, and the fifth color ring is white, which is generally used to represent a fuse resistor. If the resistor has only a black color ring in the middle, it means that this resistor is zero ohm resistor.
Example: red, black, brown gold
Its resistance is 220×10^1=2.2KΩ and the error is ±5%.
The first color circle is a hundred digits, and the second color circle is a ten digit.
The third color circle is a single digit, and the fourth color circle is the color power of the color.
The fifth color circle is the error rate.
First, from the bottom end of the resistor, find the color ring that represents the tolerance accuracy. The gold represents 5% and the silver represents 10%. In the above example, the end color ring is gold, so the error rate is 5%. From the other end of the resistor, find the first and second color rings and read the corresponding numbers. In the above example, the first three color rings are red and black, so the corresponding numbers are red 2, red. 2. Black 0, whose effective number is 220. Then read the fourth multiple color ring, brown 1. Therefore, the resistance we obtained is 220 × 10 ^ 1 = 2.2 KΩ. That is, the resistance is good between 2090-2310. If the fourth multiple color circle is gold, multiply the significant number by 0.1. If the fourth multiple color circle is silver, multiply by 0.01.
Six-color ring resistance
Identification of six color ring resistors: The first five color ring of the six color ring resistor is the same as the five color ring resistance, and the sixth color ring represents the temperature coefficient of the resistor.
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