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  • Reliability experiment

    Category Project Description Standards & EquipmentBreakdown voltageThe voltage at which the sample breaks down under specified test conditions, in KVGuideline:ASTM D149-09 (2013)GB/T 1408.1-2006IEC 60243-1-2013ASTM D1000-10GB/T 4677-2002Dielectric strength The quotient of the distance between the breakdown voltage and the voltage applied to the two electrodes (ie the thickness of the sample) under the specified test conditions. Unit KV/mmDielectric constantWhen the space between the electrodes of the capacitor and the space around the electrode is filled with the insulating material, the ratio of the capacitance Cx of the capacitor to the vacuum capacitance C0 of the same electrode is εr=Cx/C0Guideline:GB/T 1409-2006GB/T 1693-2007ASTM D150-11Dielectric loss The complement of the phase difference between the voltage applied by the capacitor and the current generated by the insulating material as a dielectric is the dielectric loss angle, and its tangent value is the dielectric loss factor.Volume resistivityThe quotient of the mainstream electric field strength and the steady-state current density in the insulating material, ie, the volume resistivity per unit volume; the unit is Ω·cm or Ω·mGuideline:GB/T 3048.3-2007GB/T 1410-2006GB/T 15662-1995ASTM D257-14Surface resistivityThe quotient of the DC electric field strength and the linear current density in the surface layer of the insulating material, ie the surface resistance per unit area; the unit is Ω/sqWithstand voltageThe withstand voltage is an experiment to test the withstand voltage or overvoltage of the insulation and to check the quality of the insulation manufacturing or repair of the electrical equipment. It is necessary to use a voltage resistance tester.Withstand voltage test is an instrument for measuring voltage resistance. It can directly, accurately, quickly and reliably test the electrical safety performance indicators such as withstand voltage, breakdown voltage and leakage current of various measured objects. It mainly achieves the following purposes:a. Test the ability of the insulation to withstand operating voltage or overvoltage.b. Check the quality of electrical equipment insulation manufacturing or repair.c. Exclude damage to insulation due to raw materials, processing or transportation, and reduce early failure rate of products.d. Check the insulation clearance and creepage distance.Guideline:EIA-364-20CDevice parameters:Agilent/34420AContact resistance Contact resistance, the resistance exhibited between conductors is called contact resistance.General requirements for contact resistance is below 10-20 mohm. Some switches require 100-500uohm or less. Some circuits are sensitive to changes in contact resistance. It should be noted that the contact resistance of the switch is the value of the allowable contact resistance of the switch in several contacts.On the circuit board is specifically refers to the contact point of the gold finger and the connector, when the current through the resistance that is presented. In order to reduce the formation of oxides on the surface of the metal, usually the positive gold finger portion and the female clip of the connector must be plated with metal to resist the occurrence of its "loading resistance". Plugs of other electrical appliances are squeezed into sockets, or there are contact resistances between the guide pins and their sockets.Guideline:EIA-364-06CDevice parameters:Agilent/34420AInsulation resistanceThe modern life is changing with each passing day, and people can not do without electricity at the moment. There is a problem of electricity safety in the process of electricity use, in electrical equipment such as motors, cables, and household appliances.Insulator DC resistance under specified conditions.Insulation resistance is the basic insulation index of electrical equipment and electrical lines. For the testing of low voltage electrical installations, the insulation resistance of motors, distribution equipment and distribution lines shall not be lower than 0.5 MΩ at room temperature (for operating equipment and wiring, the insulation resistance shall not be lower than 1 MΩ/kV). The insulation resistance of low-voltage electrical appliances and their connecting cables and secondary circuits should generally not be lower than 1 MΩ; in a relatively humid environment, not less than 0.5 MΩ; the insulation resistance of a secondary bus with a secondary circuit should not be lower than 10 MΩ. The insulation resistance of Class I hand-held power tools should not be less than 2 MΩ.Insulation resistance: add DC voltage to the dielectric, after a certain period of time after the end of the polarization process, the resistance corresponding to the leakage current flowing through the dielectric is called the insulation resistance.Guideline:EIA-364-21CDevice parameters:Taiwan Goodwell/GPT-9803Temperature riseTemperature rise refers to the temperature of each component in the electrical and electronic equipment that is higher than the ambient temperature.After passing through the conductor, the current heating effect occurs. As time passes, the temperature of the conductor surface continuously rises until it stabilizes. The stable condition is that the temperature difference between the front and rear within 3 hours does not exceed 2°C. At this time, the temperature of the conductor surface is measured as the final temperature of the conductor. The unit of temperature is degrees (°C). The portion of the rising temperature that exceeds the temperature of the surrounding air (ambient temperature) is called the temperature rise, and the unit of temperature rise is Kelvin (K). Some articles on temperature rise, test reports, and test questions often include the unit of temperature rise (°C), and unit cost (°C) indicates that the temperature rise is inappropriate. Should be expressed in (K/W). To verify the lifespan and stability of electronic products, the temperature rise of their important components (IC chips, etc.) is usually tested, and the device under test is placed at a specific temperature higher than its rated operating temperature (T=25°C). Run at temperature (T=70°C), record the temperature rise of its components above the ambient temperature after stabilization, and verify the design of this product is reasonable.In electrical products: The rated temperature rise of the motor means that the temperature of the motor winding is allowed to rise at the design ambient temperature (40°C), which depends on the insulation level of the winding. The temperature rise depends on the heat and heat dissipation during the operation of the motor. According to the temperature rise, it is usually judged whether the motor cooling is normal. The motor temperature refers to the actual heating temperature of each part of the motor. It has a great influence on the insulation material of the motor. Excessive temperature will shorten the insulation life and even cause insulation damage. Part of the temperature has an irregular limit, which is the allowable temperature of the motor.Guideline:EIA-364-70BDevice parameters:Agilent/34970The
    05-25 2018
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