In electronic components,Chip resistorIt is widely used because of its small size and stable performance. patchresistanceThe resistance value is usually identified by a resistance value table or identification code, among which the resistance value expression method of four-digit chip resistors is more common. For beginners or non-professionals, it is particularly important to understand and read the resistance table of four-digit chip resistors. This article will introduce in detail how to read the four-digit chip resistor resistance table to help you easily identify the resistor value.
1. Basic composition of four-digit chip resistorsThe identification code of a four-digit chip resistor usually consists of four numbers. The first three digits represent significant figures, and the last digit represents the multiplier (that is, the power of 10). This encoding method belongs to a simplified representation of the EIA-96 standard. Understanding this is the basis for correctly interpreting the resistance value of chip resistors.2. Reading rules for four-digit chip resistor resistance tables1. The first three digits are valid digitsFor example, the number "472" represents the combination of the two numbers 47 and 2, that is, adding two zeros after 47 becomes 4700 ohms.2. The fourth digit is the multiplierThe fourth digit represents a power of 10. For example, the number "3" represents multiplication by 10³, which is multiplication by 1000.3. Resistance calculation formulaResistance = first three digits × 10 raised to the power of the fourth digitFor example: the resistance code is "4723", then the resistance value is 472 × 10³ = 472000 ohms, that is, 472 kiloohms.3. Analysis of specific cases1. Code "1001"The first three digits "100" represent 100, and the fourth digit "1" represents multiplied by 10¹, which is 10.Calculation: 100 × 10 = 1000 ohms, which is 1 kiloohm.2. Code "5602"The first three digits "560" represent 560, and the fourth digit "2" represents multiplied by 10², which is 100.Calculation: 560 × 100 = 56,000 ohms, which is 56 kiloohms.4. Pay attention to the expression of special resistance valuesSome smaller resistance values or special resistance values will use the letter "R" instead of the decimal point, for example, "4R7" means 4.7 ohms. Although this is a three-digit identification method, it is also common in practical applications and needs to be treated differently.5. Query tool for four-digit chip resistor resistance tableIn order to facilitate identification, many electronic component suppliers and professional websites provide resistance table query tools. By entering a four-digit code, the corresponding resistance value can be automatically calculated, reducing manual calculation errors.6. Description of resistance error and accuracy levelIn addition to the resistance value, chip resistors are also marked with error levels, such as ±1%, ±5%, etc. The four-digit code itself does not contain error information and needs to be confirmed with the device manual.7. Precautions in Practical Application1. Avoid misreading numbers when identifying, especially distinguish between "0" and "O".2. Understand the power level and package size of the resistor. The resistance value is only part of the selection.3. During the welding and testing process, be careful to prevent damage to the resistor and affect the stability of the resistance value.The identification method of the four-digit chip resistor resistance table is mainly based on the rule that the first three digits are used as significant digits and the fourth digit is used as the multiplier. By mastering this rule, you can quickly and accurately read resistor values, improving the efficiency of selecting and using electronic components. Combining resistance table query tools and practical application experience, chip resistors can be better understood and utilized to ensure the normal operation of electronic equipment. I hope this article will help you understand the four-digit chip resistor resistance table.
