The resistance value identification method of the SMD resistor, you can earn it after reading it! !

(Temperature, material, length, cross-sectional area) usually affects the resistance value of the resistance element. The physical quantity that measures the magnitude of the resistance affected by temperature is the temperature coefficient, which is defined as the percentage of the resistance value that changes when the temperature rises by 1°C. Resistor resistance value labeling awareness:

Digital method: A method of marking the nominal value with three digits on the resistor.

The resistance number method is as follows:

The 1.2 digit represents the real number of resistance

If the number starting from the third place is 0, it means tens of ohms (between 10 and 99 ohms)

If the number starting from the third place is 1, it means several hundred Euros (between 100 and 999 Euros)

If the number starting from the third digit is 2, it means several thousand ohms (between 1000 and 9999 ohms)

If the number starting from the third digit is 3, it means tens of K (between 10K and 99K)

If the number starting from the third digit is 4, it means several hundred K (between 100K and 999K)

If the number starting from the third digit is 5, it means M (between 1M and 9.9)

The number starting from the third digit is 6 for ten M (between 100K and 999K)

The first three digits of the standard rule of 4 numbers are real numbers, and the fourth digit is a multiple. 1001 is 1K, 1002 is 10K, and 1005 is 10M.

Color marking method: Use different colored bands or dots to mark the nominal resistance and allowable deviation on the surface of the resistor.

(Black-0, Brown-1, Red-2, Orange-3, Yellow-4, Green-5, Blue-6, Violet-7, Gray-8, White-9, Gold-±5%, Silver-± 10%, colorless-±20%)

Direct standard method: Use numbers and unit symbols to mark the resistance value on the surface of the resistor, and the allowable error is directly expressed as a percentage. If there is no deviation marked on the resistor, it is all ±20%.

Text symbol method: Use a regular combination of Arabic numerals and text symbols to indicate the nominal resistance value, and allowable deviations are also represented by text symbols. The text symbol that indicates the allowable error: The allowable deviation of DFGJKM is (±0.5%±1%±2%±5%±10%±20%).

When the resistance is four rings: the first two digits are significant digits, the third digit is the power number, and the fourth digit is the deviation.

When the resistance is five rings: the first three digits are valid digits, the fourth digit is the power number, and the fifth digit is the deviation .