How to check for shorts, breaks, and leaks with a multimeter?
There are many ways to apply the multimeter, below I list the common ways to check the short circuit, broken circuit and leakage of the multimeter, I hope it will help you. Inadequate, welcome to add.
Multimeter check short circuit
Check whether there is a short circuit in the line, first of all, cut off the circuit breaker, and then all the switches in the line will be closed, all the equipment is closed (can be unplugged equipment, all unplugged).
Multimeter select "beeping gear", in the circuit breaker under the mouth for measurement - two pens, respectively, contact the circuit breaker under the mouth of the zero line and the fire line. If the multimeter beeps, proving that there is a short circuit in the line; otherwise, there is no short circuit.
Multimeter check broken circuit
Still cut off all the switches, the multimeter select "beeping gear". Determine the direction of the line to be measured, find the two ends of the wire.
Measurement, the two pens of the multimeter were contacted at both ends of the wire, if the beeping sound, it proves that there is no break in the wire; if there is no beeping sound, it proves that there is a break in the wire.
What if the distance between the two ends of the wire is too far? Find a wire that is confirmed to be intact and strip the ends of the wire. One end of the wire is connected to the multimeter, and the other end is used as a pen to contact the line to be tested - this is the use of wire to extend the length of the multimeter pen, this approach will be often used in practice.
Multimeter check leakage
Do not cut off the circuit breaker this time, as long as the line off all the switches, pull out all the plugs. Multimeter select "750V ~ gear", in the circuit terminal measurement (in the socket, switch and other locations, do not measure in the distribution box).
Measure the voltage between the fire line - zero line and fire line - ground line respectively. If the two measurements have the same value, or the first value is less than the second, it proves that there is no leakage in the line.
If the value of the first measurement is greater than the second, it proves that there is a leakage in the line - the greater the difference between the two, the more serious the leakage.
