How to test leakage using a multimeter
How to measure leakage with multimeter
1. Power-off measurement: turn off and disconnect all electrical appliances, use a multimeter with RX10K gear, one test lead is connected to the live wire, and the other test lead is grounded (or faucet). It should show infinite resistance, otherwise there will be leakage.
2. Live measurement: Use a multimeter with a 250-volt AC voltage range to measure the metal shell of the electrical appliance that is suspected of leakage. One test lead is connected to the shell, and the other test lead is grounded (or the faucet). When the pointer shows a voltage higher than 30-50 volts, replace it Use AC 50 volts. If the power supply is confirmed to be higher than 30 volts, it is a leakage, and lower than 30 volts is normal. Then swap the zero and fire power supply plug wires and measure again to confirm.
3. Leakage measurement between live wire and neutral wire (or live wire and live wire): turn off and disconnect all electrical appliances, measure the resistance between live wire and neutral wire, it should be infinite, otherwise it is leakage.
The accuracy rate of the above method for troubleshooting is 99.9%, convenient, fast and practical, and the megohm special shaker is only used in engineering, and the use efficiency is low in maintenance. Only when the multimeter is confirmed to be good, but the line is indeed leaking, can it be used Shake the meter, but the leakage cannot be detected by the multimeter.
