Winding resistor performance parameters
1. Electrical performance parameters of ordinary resistors:
1.1 Nominal Value: The resistor design is determined, typically marked on the resistor.
1.2 Allow Error: The difference between the nominal resistance value and the actual resistance ratio of the ratio of the nominal resistance value, which represents the resistance
Accuracy.
1.3 Rated power consumption: 70 ° C durability test at 70 ° C in ambient temperature, and the change in resistance does not exceed the allowance of the test
The maximum power consumption allowed when the value is.
1.4 Temperature coefficient: The resistance between the two specified temperatures is relatively varied to produce the temperature difference of this change. Temperature coefficient
Small, the better the stability of the resistor. The resistance increases with the temperature rise as the positive temperature coefficient, and vice versa is a negative temperature coefficient.
1.5 Rated Voltage: The DC voltage or AC voltage valid value calculated with the square root of the nominal resistance value and the rated power product.
(Note: The rated voltage is not allowed to apply a rated voltage during high resistance due to the size and structure of the resistor.)
1.6 Component Limit Voltage: The maximum DC voltage or AC voltage valid value can be continuously applied to the two extraction ends of the resistor.
(Note: When the resistance is greater than or equal to the critical resistance, only the element limit voltage is applied to the resistor.)
1.7 Crute resistance: The value of the rated voltage is equal to the limit voltage of the component. (Note: At 70 ° C ambient temperature, it is allowed
The maximum voltage on the two extraction ends of the resistor: When the resistance is less than the critical resistance value, the rated voltage is calculated, and when the resistance is greater than or equal to
When the critical resistance is the element limit voltage, when the temperature is not 70 ° C, the calculated voltage should be considered to reduce the intensive curve and component limit.
Voltage. )
1.8 Maximum operating voltage: Allowed maximum continuous working voltage. At low gas pressure, the highest operating voltage is low.
1.9 Insulation Voltage: Under the conditions of continuous work, it can be applied between the respective leaders of the resistor and any conductive mounting surface.
The maximum peak voltage.
1.10 Noise: An irregular voltage fluctuation generated in the resistor. Mainly thermal noise, contact noise and bulk noise. hot
The noise is formed by irregularities within the conductor. The noise of the resistor can not be considered in the general circuit, but in weak
The signal system cannot be ignored.
Measures that can take for low noise design are: 1, use low resistance. 2. Considering the type of resistance is priority to the wire resistance,
The secondary is a metal film resistance, a metal oxide film resistance, a carbon film resistance. But it is necessary to note that the linear resistance of the large resistance value is not much, and
Incidental inductance, in some cases it will result in the unstable design.