PCB News - a simple way to identify the resistance of the color ring

PCB manufacturer, a simple way to identify the resistance of the color ring [small tips]

Color ring resistors are the most commonly used electronic components in electronic circuits. Color ring resistors are color rings coated with different colors on ordinary resistor packages to distinguish the resistance of the resistor. Ensure that the resistance value can be read clearly when installing the resistor, no matter from which direction it is installed. The basic units of the color ring resistance are: ohm (Ω), kiloohm (KΩ), and megaohm (MΩ). 1 megaohm (MΩ) = 1000 kiloohms (KΩ) = 1,000,000 ohms (Ω).

The commonly used color ring resistors can be divided into four rings and five rings, and four rings are usually used. Among them, the first two rings of the four-ring resistance are numbers, the third ring represents the number multiplied by the resistance value, and the last ring is the error; the first three rings of the five-ring resistance are numbers, the fourth ring represents the number multiplied by the resistance, and the last ring Is the error. The error is usually three colors of gold, silver and brown. The error of gold is 5%, the error of silver is 10%, the error of brown is 1%, the error of colorless is 20%, and occasionally there are errors with green ghostwriting., The error of green is 0.5%. Precision resistors are usually used in military, aerospace and other aspects. The color ring resistance was used to help people distinguish the resistance in the earliest stage. Because the color ring resistance is relatively large, in today's highly integrated situation, the color ring resistance has been used less.

But sometimes because of cost issues or process requirements, color ring resistors are still used in large quantities.

There is a small mouth decision: brown, one red, two oranges are three, four yellows, five greens, six are blue, seven purples, eight grays, nine pairs of white, black is zero, and gold, five and silver are ten errors.

Four-color ring resistance: The first two color rings are used to indicate the resistance value, and the third ring represents the number of "0" added after the number. The three color rings are relatively close to each other, while the fourth ring is relatively far apart. This is Represents the error. If the resistor color ring is not easy to distinguish which is the first color ring, the easiest way is that the "fourth ring" is either gold or silver, and other colors will have less silver (only useful for four-ring resistors, five-ring resistors) not applicable).

E.g:
1. Red, yellow, brown, gold 24*10=240 Euro gold, the error is 5%

2. Green, red, yellow, silver 52*10000=520K ohms, the error is 10%

Five-color ring resistance: the first color ring represents the first digit of the resistance value; the second color ring represents the second digit of the resistance value; the third color ring represents the third digit of the resistance value, and the fourth color The ring represents the multiplier of the resistance value; the fifth color ring represents the error range. Generally, five-ring resistors are relatively precise resistors.

E.g:
1. Red, red, black, black, brown 220*1=220 ohms, the error is 1%

2. Purple, red, brown, red, green 521*100=52.1K ohms, the error is 0.5%

Six-color ring resistance: refers to the resistance with the six-color ring. The first five-color ring of the six-color ring is expressed in the same way as the five-color ring. The sixth color ring represents the temperature coefficient of the resistance. Electronic products are only used in occasions with specific requirements, and are generally used very rarely.

ipcb is a high-precision and high-quality PCB manufacturer, such as: isola 370hr PCB, high-frequency PCB, high-speed PCB, ic substrate, ic test board, impedance PCB, HDI PCB, Rigid-Flex PCB, buried blind PCB, advanced PCB, microwave PCB, telfon PCB and other ipcb are good at PCB manufacturing.