Color ring resistance is a common resistance representation method. Different color rings are coated on the resistance body to represent different values and precision. Reading of color ring resistance requires certain skills and steps. The following are some basic calculation methods:
1. Identify the color ring: The color ring resistor usually has four color rings, which are brown, red, green, blue, purple, gray, black, orange and yellow from the outside to the inside. Each color represents different values and units.
2. Reading values: for the first two color rings, they represent the main values of resistance. Specifically:
● The first color ring represents the first digit of the resistance.
● The second color ring represents the second digit of the resistance. For example, if the color of the color ring resistor is brown black red green brown (from outside to inside), its main value is 100 Ω (brown represents 1, black represents 0, red represents 2, green represents 5, and brown represents 1).
3. Determination precision: for the third color ring, it represents the precision of the resistance. Specifically:
● The precision of gold is ± 5%, and that of silver is ± 10%. For example, if the color of the color ring resistor is brown black red gold brown, then its accuracy is ± 5% (gold represents ± 5%).
4. Calculate the total resistance value: multiply the main value by the power of 10 to get the total resistance value of the resistance. The power value is equal to the number of intervals between the third color ring and the first color ring. For example, if there is a color ring between the third color ring and the first color ring (i.e. brown black red gold brown), the total resistance is 100 × 10 ^ 1=1000 Ω.
5. Determine the temperature coefficient: the fourth color ring usually represents the temperature coefficient of the resistance. The unit of temperature coefficient is usually ppm/℃. For example, if the color of the fourth color ring is blue, then the temperature coefficient is+ 200ppm /℃。
6. Check the color ring sequence: when calculating the resistance value of the color ring resistance, make sure that the color ring sequence is correct. If the color rings are in the wrong order, serious errors will occur in the calculation results.
It should be noted that the above is only the basic reading method of the color ring resistance. In practical application, it is also necessary to make appropriate adjustments and corrections according to specific circuit requirements and conditions. In addition, some high-end AT25128B-XHL-T Color ring resistance may be represented by six or more digits, and its reading method is relatively more complex. Therefore, it is better to use some professional tools or manuals for auxiliary judgment when reading the color ring resistance.
