In the field of electronic manufacturing, SMT (surface mount technology) connectors are indispensable components of electronic devices. The stability and reliability of their electrical performance are directly related to the operating efficiency and safety of the entire system. Therefore, regular electrical performance testing of SMT connectors is not only a necessary link to ensure product quality, but also the key to improving product competitiveness. The key indicators of SMT connector regular electrical performance testing technology provide valuable reference and guidance for practitioners in the electronic manufacturing industry.
The core of insulation resistance testing
Insulation resistance is the resistance value corresponding to the leakage current generated on the surface or inside of the insulation part after voltage is applied to the insulation part of the connector. The calculation formula is: Insulation resistance (MΩ) = voltage applied to the insulator (V) / leakage current (μA). Through insulation resistance testing, it can be ensured that the insulation performance of the connector meets the circuit design requirements and the technical conditions under environmental stresses such as high temperature and humidity.
The significance of insulation resistance to circuit design
Insulation resistance is a key factor in designing high impedance circuits. Low insulation resistance means high leakage current, which may disrupt the normal operation of the circuit, such as forming a feedback loop, causing insulation damage or degradation of electrical performance.
Factors affecting insulation resistance
Insulation material : It is very important to choose the right insulation material. For example, the insulation performance of materials such as phenolic glass fiber plastic and reinforced nylon decreases in high temperature and humid environment, while special engineering plastic PES shows better stability.
Temperature : High temperature will destroy the insulating material and reduce the insulation resistance and voltage resistance. At the same time, high temperature will also affect the performance of the metal shell, such as making the contacts lose elasticity and accelerating oxidation.
Humidity : Humid conditions can cause a significant reduction in insulation resistance. When exposed to high temperature and humidity for a long time, the insulator may physically deform and decompose, causing cracks and electrolytic corrosion.
Contamination : The cleanliness of the interior and surface of the insulator has an important impact on the insulation resistance. Residues such as impurities, metal shavings and flux reduce insulation resistance.
Test voltage : The test voltage applied during insulation resistance inspection has a significant impact on the test results. When the test voltage increases, the leakage current increases non-linearly, causing the insulation resistance value to decrease. Therefore, the test must be carried out according to the test voltage specified in the product technical conditions.
Duration : Due to the capacitance of the connector under test, the power supply needs to charge the capacitance at the beginning of the measurement, causing the resistance value indicated on the insulation resistance tester to gradually increase. To ensure the accuracy of the test, the reading must be taken after the voltage is applied for a certain period of time.
In conclusion
KONNRA connectors have a good reputation in the industry and have obtained multiple certifications such as ISO9001, ISO14001, ISO13485, IPC620, IATF16949, UL, etc. It has a laboratory accredited by CNAS China, which can complete various precision routine tests, mechanical performance tests, electrical performance tests, environmental performance tests and environmental testing equipment . Ensure that the product meets strict standards in quality and environmental protection. Through these certifications, KONNRA continuously optimizes the production process to improve the reliability and stability of the product, and strives to provide customers with high-quality services and solutions.
