Ageing condition inspection system for electrical contact based on micro-current contact resistance trend tracker

An equipment which was used to inspect the ageing condition of electrical contact by track the trend of contact resistance under micro-current was developed. Compared with existing technology, the equipment can not only measures the contact resistance under micro-current(100 μ A) which is propitious to evaluating the ageing condition of a contact, but also grasp the trend that contact resistance follows the changed current (range of 100 μ A to 1A) which is help to estimate where a contact should be used and which type of contact should be used in specific situation. The scanning electron microscopy and Energy Dispersive Analysis System of X-ray were used to verify the ageing condition.