High current resistance measurement is usually carried out on high voltage components like cables, switch gears and bus bars. A Digital Low Resistance Ohmmeter commonly uses currents from 10 Amperes to 50 Amperes in measuring low resistances. However, many prefer to test at high currents because this mimics the real working conditions of the electrical parts. A high current Digital Low Resistance Ohmmeter with a test current of 100+ Amperes makes it ideal for this situation.
Bus bars, circuit breakers and other high voltage equipment are tested for integrity using a DLRO. Internal problems like metal stress, weak joints and contaminants can change the condition of these parts which causes its resistance to increase. Most use testers with an output of 10+ amperes for this purpose. However, many engineers think that it would be ideal to use higher currents that are close to its rating. This determines how a certain part will act under normal operation.