Check leakage multimeter to play what gear? Digital multimeter how to test leakage
Measure the voltage to ground of the equipment with an AC voltage gear under energised conditions. Measure the resistance to ground of the energised part with a resistor in the case of a power failure.
Serious leakage with the multimeter resistance can be found out, but the leakage is not serious, the multimeter can not be measured; measurement of insulation has a special insulation resistance tester, such as: shaking table, digital megohmmeter, etc., these can simulate the real working voltage, the multimeter test voltage are very low.
Firstly, ask the user to report what fault phenomenon, what are the obvious characteristics; secondly, from the surface observation of any intuitive fault points, and then the next step in the inspection.
1. first disconnect the user's power supply into the line of the main isolation switch, turn off all the user's electrical load, such as unplugging the refrigerator, disconnecting the pump switch.
2. put the digital multimeter on the ohm gear 200M block, a pen on the load side of the two out of one of the wires, the other pen touching the wall, preferably touching the grounding wire or temporary grounding wire. Wait for the multimeter on the display of the number of stable, read out the main line insulation resistance value, if the insulation resistance value is less than 0.5 megohm, then the main line problem, if the insulation resistance in the 0.5 megohm more than that can be ruled out is the main line problem. Measure another wire in the same way, also check the value to see if the main line is a problem.
3. Check the insulation resistance value of the sub-circuit and each electrical appliance, also use the same method to test one by one, until you find the fault point.
Operation Precautions
1. when using the 200M block of the multimeter ohmmeter, pay attention to the metal parts of the pen can not be touched with your hand during the measurement, which will make the reading inaccurate.
2. When measuring each electrical equipment, pay attention to the discharge first, in order to prevent the capacitive current in the electrical equipment from hurting people.
This method is a safer way to find faults in the absence of electricity. This method is also applicable to power users and plant leakage of the search, but in the search, not only to disconnect the power supply into the line, but also should be disconnected from the zero line, to avoid electrocution accidents.
