At present, color rings are widely used in domestic or imported TV sets and radio recorders resistance Its advantage is that in the process of assembly, debugging and repair, the color ring can be seen from any angle and the resistance value can be read without moving the element, which is very convenient to use. The resistance reading method of color ring has been introduced in previous magazines. When reading according to the method, conversion is troublesome. Here is a method to quickly identify the resistance value.
The first and second rings with four color rings respectively represent the first two digits of the resistance value; The third ring represents magnification; The fourth ring represents error. The key to fast identification is to determine the resistance value within a certain order of magnitude according to the color of the third ring, such as the number of K points or tens of K points, and then "substitute" the number read out by the first two rings, so that the number can be read out quickly.
Here are some key points to master this method:
(1) Remember the number represented by each color of the first and second rings. It can be remembered as follows: brown 1, red 2, orange 3, yellow 4, green 5, blue 6, purple 7, gray 8, white 9, black 0. In this way, read together and repeat several times to remember. The key to quick recognition is to remember the resistance range represented by the third ring color accurately. Specifically, gold: a few dots, black: several tens of Ω, brown: hundreds of dozens of Ω, red: a few dots, k Ω, orange: a few tens of k Ω, yellow: hundreds of dozens of k Ω, green: a few dots, M Ω, blue: a few tens of M Ω From the perspective of order of magnitude, they can be divided into three major levels in the body, namely, gold, black, and brown are ohmic; Red orange and yellow are at the level of thousand Euros; Green and blue are megaohmic. This division is for the convenience of memory.
(3) When the second ring is black, the color of the third ring represents an integer, that is, several, dozens, hundreds of k Ω, etc. This is a special case when reading. Pay attention. For example, if the third ring is red, its resistance is the whole number of k Ω.
(4) Remember the error represented by the fourth ring color, that is, gold is 5%; 10% for silver; Colorless is 20%.
The following is an example:
Example 1 When the four color rings are yellow, orange, red and gold in sequence, because the third ring is red and the resistance range is a few k Ω, the reading is 43 k Ω if the numbers "4" and "3" represented by yellow and orange are substituted. The gold ring indicates that the error is 5%. Example 2 When the four color rings are brown, black, orange and gold in sequence, because the third ring is orange and the second ring is black, the resistance value should be tens of k Ω, and the number "1" represented by brown is substituted, and the reading is 10 k Ω. The fourth ring is gold, with an error of 5%.
