Main parameters of glazed resistance nominal parameter content
2026-01-01
1. Nominal resistance and error
The number marked on the glazed resistor represents the nominal resistance. Due to specifications, not all resistors can be produced. The resistance value of this resistor is mainly divided into four series according to its accuracy: E-6, E-12, E-24, and E-96. The allowable error of resistance is the percentage of the difference between the nominal resistance and the actual resistance and the difference between the nominal resistance, indicating the accuracy of the resistance. Any resistor with an actual value within the allowable error range is qualified.
2. Rated power
The rated power of a resistor refers to the high power that the resistor can operate continuously for a long time and meet performance requirements during normal operation. Normal pressure 90-106. 6kpa， The high power consumption allowed by the long-term operation of the glaze resistor when the ambient temperature is -55~+70. Exceeding this value will cause the resistor to burn out due to overheating.
3. Large working voltage
The high working voltage refers to the working voltage at which a resistor will not overheat or breakdown for a long period of time. Allowable large continuous operating voltage. When the air pressure is low, the working voltage is lower. If the voltage of the glaze resistor exceeds this value, sparks may be generated inside the resistor, causing deviations in circuit performance. The rated voltage is the voltage converted from the resistance to the rated power.
4. High frequency characteristics
When resistors operate at high frequencies, DC resistors become series distributed inductors and parallel distributed capacitors, which are the original glazed resistors. The influence of intrinsic inductance and capacitance of resistors on the circuit should be considered.
5. Temperature coefficient
The smaller the temperature coefficient, the better the stability of the resistance. The glaze resistance has a positive temperature coefficient with increasing temperature, and vice versa.
Application of resistors
1. Reduce pressure
If the rated voltage of a household appliance is lower than the voltage of the power supply, in order to ensure its normal operation, a glazed resistor can be connected in series with the appliance, and the resistor can withstand part of the voltage to determine the normal operation of the appliance. This resistor is called a step-down resistor.
2. Current limiting
A current limiting resistor is a glazed resistor connected in series in a circuit to limit the branch current and prevent excessive current from burning out the connected components. At the same time, the current limiting resistor can also play a role in distributing pressure.
3. Signal isolation
When multiple signal inputs are required at a certain point in the circuit, high-value glazed resistors are usually used to separate several inputs to prevent them from interfering with each other.
Resistance detection
In order to improve the accuracy of glaze resistance detection, the appropriate range should be selected based on the nominal resistance value of the tested resistor. For a pointer multimeter, due to the non-linear scale of the ohmmeter, only the dial in the middle of the scale is more accurate. Therefore, when measuring, it is advisable to choose the appropriate range so that the dial pointer points to the middle part of the dial. Follow Sichuang Electric to learn more about glazed resistors.
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