How to make Contact Resistance test ?

The connection of circuit have various ways and means, such as connected by welding, by pressing, by plug in and blot tightly. If you want to know the quality of a connector and its conduction characteristic, you just need to measure its contact resistance. The larger area and the less impurity of the pair metals surface is, the better conductivity and the lower resistance

For Contact Resistance Test high current should be used (approximately 100A). The high current can melt the oxide film and dust between pairs of contact, things just like the condition what is actually happening in working status.

The contact resistance is measured by injecting DC current and measuring the DC voltage drop across it. Then by dividing the voltage drop over the injected current we will get the DC contact resistance.

Видео How to make Contact Resistance test ? канала alfanar Testing and Commissioning