The main characteristic parameters of the resistor
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The main characteristic parameters of the resistor:
1 nominal resistance: the resistance value indicated on the resistor.
2 Allowable error: The percentage of the ratio of the nominal resistance to the actual resistance and the nominal resistance is the resistance deviation, which indicates the accuracy of the resistor. The correspondence between the allowable error and the accuracy level is as follows: ±0.5%-0.05, ±1%-0.1 (or 00), ±2%-0.2 (or 0), ±5%-I, ±10%-II, ± 20%-III.
3 rated power: the maximum power allowed to be dissipated by the resistor for long-term operation under normal atmospheric pressure of 90-106.6KPa and ambient temperature of -55°C~+70°C.
Wirewound resistor rated power series is (W): 1/20, 1/8, 1/4, 1/2, 1, 2, 4, 8, 10, 16, 25, 40, 50, 75, 100, 150, 250, 500
Non-wire wound resistor rated power series is (W): 1/20, 1/8, 1/4, 1/2, 1, 2, 5, 10, 25, 50, 100
4 rated voltage: the voltage converted from the resistance and rated power.
5 maximum working voltage: the maximum continuous working voltage allowed. When operating at low air pressure, the maximum operating voltage is low.
6 Temperature coefficient: The relative change in the resistance value caused by the temperature change of 1 °C. The smaller the temperature coefficient, the better the stability of the resistor. The resistance increases with increasing temperature as a positive temperature coefficient, and vice versa.
7 Aging coefficient: The percentage of the relative change of the resistance of the resistor under the long-term load of rated power. It is a parameter indicating the length of life of the resistor.
8 Voltage coefficient: The relative change in the resistance of the resistor for every 1V change in the specified voltage range.
9 Noise: An irregular voltage fluctuation generated in a resistor, including thermal noise and current noise. The thermal noise is due to the irregular movement of electrons inside the conductor, causing the voltage of any two points of the conductor to irregularly change.