How to use the multimeter's live wire identification function
Ordinary electric pen: In the past, when electricians repaired and checked faults, one electric pen dominated the world. Ordinary electric pens distinguish between live and neutral wires, and most people basically know that they can directly measure live and neutral wires with an electric pen. If the electric pen lights up, it is called live wire, and if it does not light up, it is called neutral wire
Digital pen: Since the advent of digital pens, ordinary pens have been rarely used. Digital pens have more functions, such as checking for broken wires when not in use, distinguishing between neutral and live wires, distinguishing between the positive and negative poles of DC batteries, and determining whether wires are short circuited. Therefore, ordinary pens have gradually been phased out. To distinguish between live and neutral wires with digital pens, the live and neutral wires can be directly measured with a pen, and the voltage of the digital pen can be observed. If the maximum voltage displayed is 220V, it proves to be a live wire. If the maximum voltage displayed is 12V or 36V, it proves to be a neutral wire
Inductive breakpoint tester: The main function of the breakpoint tester is to locate the internal breakpoint of the circuit after the wire is not powered on. The breakpoint tester distinguishes between the live wire and the neutral wire, and uses the breakpoint tester to measure the live wire and the neutral wire separately. When measuring the live wire, the sound emitted by the breakpoint tester is relatively rapid, and when measuring the neutral wire, the sound emitted is relatively slow
For multimeters, there is always an AC voltage range, which can measure the voltage of AC power. When measuring the voltage, use red and black probes placed on the live and neutral wires respectively to display its voltage. However, when measuring the voltage, it should be placed in the appropriate range. For example, when measuring household 220V and 380V voltage, the multimeter should be placed in the AC voltage range of 700V
For AC voltage levels, not only can voltage be measured, but also live and neutral wires can be distinguished. It's just that many people don't know. A multimeter distinguishes between live and neutral wires. Place the multimeter in the AC voltage range, put the black probe aside, and use the red probe to measure the live and neutral wires separately. Observe the numbers on the multimeter. The larger the number, the live wire, and the smaller the number, the neutral wire. If you feel that the numbers are not very obvious, you can adjust the range to be smaller, so that the numbers will be more obvious
