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What does the ppm value of resistance refer to?
The ppm value of resistance refers to the temperature coefficient of resistance, which is the amount of change in resistance value per unit temperature change. Ppm is the abbreviation for "parts per million", meaning one part per million.
Resistance is a commonly used component in electronic circuits, used to control the magnitude of current. In practical applications, the value of resistance may be affected by environmental temperature, and its resistance value varies with temperature. In order to accurately describe the temperature variation characteristics of resistance, people have introduced ppm values for measurement.
Specifically, the ppm value represents the ratio of the change in resistance value per unit temperature to the resistance value, usually expressed in parts per million. The smaller the ppm value, the better the temperature stability of the resistance and the smaller the range of variation; The higher the ppm value, the greater the sensitivity of the resistance value to temperature changes.
The ppm value of resistance can be calculated using the following formula:
Ppm=(R2 R1)/(R1 * (T2 T1) * 10 ^ -6)
Among them, R1 and R2 are the resistance values at two different temperatures, and T1 and T2 are the corresponding temperature values. This formula can be used to calculate the rate of change of resistance at different temperatures.
In practical applications, the ppm value of resistance is very important for some precision instruments and high-precision circuits. For example, in the fields of measurement instruments, automatic control systems, and precision instruments, there are very high requirements for the stability and accuracy of resistors. If the ppm value of the resistance is too large, it may cause measurement errors or system instability.
In order to meet these high requirements, people usually choose resistors with low ppm values to ensure the stability and accuracy of the circuit. When selecting a resistor, in addition to considering its resistance value, it is also necessary to pay attention to its ppm value to ensure that its performance meets the requirements at different temperatures.
In the electronic component market, common resistance ppm values include 10ppm/℃, 25ppm/℃, 50ppm/℃, etc. Generally speaking, the lower the ppm value, the higher the price of the resistor, as its manufacturing process and material selection requirements are higher.
In summary, the ppm value of resistance is an important parameter describing the temperature coefficient of resistance, which reflects the sensitivity of resistance value to temperature changes. When selecting resistors, it is necessary to choose the appropriate ppm value based on specific application requirements to ensure the stability and accuracy of the circuit.
