The role of porcelain tube resistors and precautions for use
Porcelain tube resistors, power-type wire wound resistors allow standard resistance deviations of ± 5% (J level) ± 10% (K level), according to customer needs can improve higher precision products, such as ± 1% ( F grade) ±2% (G grade) temperature coefficient: ≤ ±350ppm/℃ ambient temperature -55℃～+155℃ surface temperature resistance 300℃, maximum temperature resistance 800℃, resistance surface is coated with insulating resin paint, material They are all environmentally friendly products, adopting vertical corrugated winding, which can reduce parasitic inductance, enhance the function of heat dissipation, reduce the volume, extend the service life and other characteristics. The resistance is fixed or adjustable and can be set to two or more. Multiple terminals with good conductivity can also be designed and manufactured according to different customer needs.
The role of porcelain tube resistors
1. Porcelain tube resistors can use high temperature resistant ceramic tubes as the winding matrix.
2. It has high heat dissipation performance, and the resistance wire with high stability is selected.
3. Winding according to scientific engineering standards and rigorous process methods, so that the resistor itself has strong impact resistance and high stability.
4. Non-combustible paint encapsulation, so that the resistance wire can be effectively protected.
5. Porcelain tube resistors can also improve the common usage. According to the customer’s needs, we can make fixed or adjustable or corrugated resistors.
6. If it is said that the corrugated winding can not only eliminate its parasitic inductance, but also improve its heat dissipation performance.
7. The scope of application of porcelain tube resistors includes power supply testing, circuit loads, frequency converters, lifting, braking, industrial automation, electric power and other electromechanical equipment.
Precautions for using porcelain tube resistors
Porcelain tube resistors should be inspected before use. To check their performance is to measure whether the actual resistance value is consistent with the nominal value and whether the error is within the allowable range. The method is to use the resistance file of the multimeter to measure.
Two points should be paid attention to when measuring:
1. Determine the range based on the measured resistance value, so that the pointer indicates the middle section of the scale line, so that it is easy to observe.
2. After determining the resistance range, zero adjustment is required. The method is to short-circuit the two test leads (directly touch each other). Adjust the “zero adjustment” electrical appliance so that the pointer accurately points to the “0” of the Ω scale line, and then measure the resistance. Resistance. In addition, be careful not to touch the two ends of the resistor or the metal part of the test lead. Otherwise it will cause test errors.
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