According to Engineer Desso, insulation resistance refers to the ability of an insulating material in an electrical device or line to resist an electric current, and its value is usually expressed in megaohms. In the case of M12 connectors, the magnitude of the insulation resistance reflects the insulation performance between the conductive parts inside the connector and between the conductive parts and the housing. The high insulation resistance means that the connector can effectively prevent current leakage and short circuit during operation, thus ensuring the safe operation of the equipment.
The direct method is a method of evaluating the insulation properties of a connector by measuring its resistance value between its two ends. Commonly used direct methods include the megohmmeter method and the high-voltage resistance method.
The megohmmeter method is a method of measuring insulation resistance using a megohmmeter. This method is easy to operate and fast to measure, making it suitable for rapid screening of high-volume connectors. However, due to the low measurement voltage of the megohmmeter method, it may not be possible to measure accurately for some connectors with high insulation resistance.
The high-voltage resistance method is a method of measuring insulation resistance by applying a higher voltage across the connector. Due to the higher voltage applied, the high-voltage resistance method is able to more accurately reflect the insulating properties of the connector. However, it should be noted that the high-voltage resistance method may cause some damage to the insulating material of the connector, so it needs to be operated with caution in practical applications.
The indirect method is a method of indirectly evaluating the insulation resistance of a connector by measuring its electrical performance under specific conditions. Commonly used indirect methods include dielectric strength testing and leakage current measurements.
The dielectric strength test is a method of applying a gradually increasing voltage to both ends of the connector to observe whether it has a breakdown phenomenon. This method can intuitively reflect the insulation performance of the connector, but the operation process is cumbersome and requires high skill of the tester.
Leakage current measurement is a method of evaluating the insulation performance of a connector by measuring the tiny currents it passes through at an operating voltage. The magnitude of leakage current reflects the performance of the internal insulation material of the connector, which is one of the important indicators to evaluate the insulation performance of the connector. The advantage of the leakage current measurement method is that it can monitor the insulation performance of the connector in real time, but its measurement accuracy is affected by a variety of factors, such as ambient temperature, humidity, etc.
Select appropriate testing methods and equipment to ensure that the equipment is in good condition and meets the requirements of relevant standards; Clean the connector to remove impurities such as dirt and oxides on the surface; Connect the measuring line correctly according to the machine manual.
Initial measurements are made before the test voltage is applied, and the initial data is recorded as a reference for subsequent analysis.
The corresponding test voltage is applied according to the selected detection method and held for a certain time.
Environmental factors such as temperature and humidity can affect the insulation performance of connectors. Therefore, when conducting insulation resistance testing, the environment should be kept as stable as possible and meet the requirements of the standard; At the same time, multiple measurements can be taken under different environmental conditions to obtain more accurate results.
The accuracy and stability of the measuring device have a significant impact on the measurement results. Therefore, when selecting measurement equipment, it should be ensured that it meets the requirements of the relevant standards and is regularly calibrated and maintained; At the same time, during use, attention should be paid to follow the operation specifications in the equipment manual to avoid errors.