It is difficult to determine the breakpoint of a multimeter. Here is a solution
The preferred troubleshooting tool for electricians is a multimeter. Once used to it, even if you don't have a multimeter around, you may feel uneasy when encountering faults. This is also one of the professional habits. Since a multimeter is a maintenance tool for electricians, we need to find ways to maximize its potential. Below is a method of using a multimeter that is not well-known to many people. I hope it can be helpful for colleagues who read this article in their work. Experienced technicians who know this method can completely ignore it.
Wire breakage, also known as open circuit, is one of the common faults encountered by electricians. It is very common in work and can be easily determined with a multimeter. Using the resistance range of a multimeter to measure the beginning and end of a section of wire, the quality of the connection and disconnection can be immediately known. This is something that all electricians in the industry know. So, the problem is, if we use a multimeter to measure a section of wire and find that there is an open circuit in the middle, and we don't have any other measuring instruments at hand, how can we accurately locate the position of the wire breakage? It is impossible to cut and search for broken wires one by one, as this would lose the original purpose of troubleshooting. However, with only a multimeter, we can still quickly locate the location of the broken wire.
When we use the resistance range to determine if a section of wire is broken, we first power on the wire and then use the low voltage range of the multimeter. Remember to only use the range for measuring AC voltage, and use a digital meter. It is generally recommended to use the 20 volt AC range of the digital meter. Too large or too small is not conducive to fault diagnosis. When searching, one hand holds the metal tip of the black gauge pen, and the red gauge pen moves along the energized wire to see the number changes on the meter screen. If the number on the meter decreases significantly or suddenly changes sharply when moving to a certain position, then we can determine the approximate location of the wire break, mark it, strip the wire after power failure, connect the wire, and then complete the troubleshooting.
It should be noted that this method cannot be used for shielded wires or wrapped wires containing metal shells. Additionally, brand tables must be used for digital meters, and this method is not recommended for multi stranded wires interwoven together as shown in the diagram.
