Method for measuring leakage current with a multimeter
A multimeter can not only measure voltage but also leakage. There are two methods for measuring leakage, one is resistance method, and the other is voltage method. Regardless of resistance method or voltage method, the red probe is inserted into the V Ω hole of the multimeter, and the black probe is inserted into the COM hole of the multimeter.
How to measure whether an electrical device is leaking electricity using the resistance method? First, turn off the power supply of the electrical device, use a multimeter, and adjust the gear of the multimeter to the buzzer gear of the resistance. One probe of the multimeter is placed on the outer shell of the electrical equipment, and the other probe is placed on the live and zero wires respectively. If the multimeter emits a sound, it indicates that the electrical equipment has serious leakage and the location of the leakage must be checked.
If the multimeter does not make a sound, the resistance range of the multimeter should be increased step by step until the resistance value is measured. Generally, a resistance value below 0.38M Ω is considered leakage, and a resistance value above 0.38M Ω is considered no leakage.
The voltage method is used to measure the leakage of electrical equipment. Close the switch of the electrical equipment and help the multimeter shift to the AC gear of 700V (each multimeter may have different gears, adjust to the maximum current gear). The red lead of the multimeter is placed on the shell of the electrical equipment, and the black lead is placed on the zero line. The multimeter displays voltage, indicating electrical equipment leakage. The multimeter displays voltage as zero, indicating no leakage.
The voltage method has certain limitations in measuring leakage, as it can only measure the leakage of the live wire, not the leakage of the zero wire. If there are capacitive components in electrical equipment, it can also affect the accuracy of voltage method measurement, so it is not recommended to use voltage method.
