Clamp the A, B, C three-phase wires connected to the load (such as a motor) into the jaws at the same time. If there is no indication, it means that the three-phase circuit is balanced. If there is a reading, it means that there is a zero sequence current, indicating an imbalance. Clamp two of the three-phase wires, and the displayed reading is the current value of the unclamped one-phase.
If the current to be looped is less than the number of turns in the clamp (set as N turns), then divide the current value indicated by the meter by the number of turns N, which is the resistance value to be measured.
If the current to be measured is greater than the maximum range current, the current transformer can be used. The method is: cut the current transformers in the load loop into short circuits, clamp the jaws of the clamp-on ammeter into the secondary short-circuit wire, multiply the measured current by the transformation ratio of the current transformers, which is the measured load loop. current value.
