1. Connect the wires according to the four terminal connection method.

2. Turn on the power.

Press the measurement button (if the current display shows A value less than 100A, it can be corrected by adjusting the panel current).

After measuring the displayed value, the data needs to be saved.

After the measurement is completed, please turn off the power.

Please take good care of the testing pliers.

The conventional dual arm DC bridge is commonly used in power systems to measure the DC resistance of transformer coils and the contact resistance of high-voltage circuit breakers, but the testing current of such bridges is only in the m * levelIt is difficult to detect the defect of reduced cross-sectional area of the conductive circuit conductor in the transformer coil. When measuring the contact resistance of the conductive circuit of a high-voltage switch, the measured resistance value is several times larger due to the influence of the oil film and the oxide layer between the dynamic and static contacts, which conceals the true contact resistance value.