The working principle of the insulation resistance of the connector refers to the resistance value exhibited by applying a voltage to the insulating part of the connector, thereby causing leakage current on the surface or inside of the insulating part. That is, the insulation resistance (MΩ) = the voltage applied to the insulator (V)/leakage current (μA). Through the insulation resistance test to determine whether the insulation performance of the connector can meet the requirements of circuit design or when it is subjected to environmental stresses such as high temperature and humidity, whether its insulation resistance meets the requirements of relevant technical conditions.

The main factors affecting the insulation resistance of the connector are the insulation material, temperature, humidity, contamination, test voltage and the duration of continuous application of the test voltage.