How to locate the wire break in the conductor using a multimeter
Because of the manufacturing process or external forces and other reasons, sometimes the conductor will occur in the internal broken wire situation. When the wire occurred in the internal broken wire, how to use a multimeter to quickly determine the point of disconnection? You can use two methods: measuring resistance method or measuring voltage method.
The two ends of a section of wire are A and B, and point O is the midpoint of this section of wire. We can first use the multimeter's ohm file to measure the A point and O point is not on, if it is on, the point of failure in the O ~ B section. If not, it means that there is a failure point in the A ~ O section. Determine the point of failure in which a half-segment, and then use this approach half-segment half-segment gradually narrow the scope, until the point of failure is found.
With this approach, the multimeter pen may not be long enough, you can use other wires to extend. You can also add 220 volts at the A side, in the O point with the multimeter AC voltage file to measure the ground voltage, if the voltage is normal that the fault in the O ~ B section. Specific measurement method with the same resistance measurement method. This approach does not extend the multimeter pen, but charged measurement, be sure to pay attention to safety.
A, B, C for the three wrapped in the same insulator within the wire, which has a broken wire. We first connect a section of the wire. Then use the multimeter ohm gear were measured A, B, C three points, if A and B connected, A and C is not, B and C is not, then the point of disconnection must be in the C wire. The same approach can also determine the point of failure in which a wire in the end.
Of course, you can also use the voltage method to measure. Connected to the end of the 220-volt voltage, and then use a multimeter to measure the A, B, C three points of the voltage to ground, which point of the ground voltage is not or not normal, that the fault in which a wire. Determine the point of failure in which a wire, and then use the previously described "half" rule of step-by-step investigation.
