What is the meaning of PPM in the resistor specification?
1. Temperature coefficient: ppm/℃, that is, the change of resistance value caused by unit temperature.
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2.?ppm (partpermillion) means one part per million. For example, for a resistor with a nominal resistance of 1K, the temperature coefficient is 100ppm/°C, which means that a change in temperature of 1 degree Celsius, the resistance changes by 1k0.1Ω, and a change of 100°C, the resistance changes by 1k10Ω. The accuracy is very high. The precise temperature coefficient of resistance is tens of PPM, and the common temperature coefficient is 200 to 250 PPM
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The resistance value of all physical resistors is not a fixed value, but varies with temperature, only to a lesser extent, and in most cases does not require special attention. The temperature coefficient of resistance, which is the relative change in resistance value for every 1 degree change in temperature, is commonly used as the unit of PPM (parts per million). The temperature coefficient of the metal film resistors that we usually use is about 100~300PPM, and the wire wound?precision resistors are about 10~50PPM, the smaller the temperature coefficient, the more expensive the resistors are.
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