How to use the hot wire recognition function of a multimeter
Before using an electric pen for maintenance and troubleshooting, a multimeter is now used. In fact, not only can an electric pen distinguish between live and zero wires, but a multimeter can also distinguish between live and zero wires, which is just unknown to many people
The Method of Distinguishing Live Line and Zero Line with Electric Pen
Ordinary electric pen: In the past, for electricians to repair and troubleshoot, it was just one electric pen that went global. Ordinary electric pens distinguish between live wire and zero wire, and most people basically know that using an electric pen to directly measure the live wire and zero wire, the light on the electric pen is the live wire, and the light off the electric pen is the zero wire
Digital electric pen: Since the advent of digital electric pens, ordinary electric pens have been rarely used. For digital electric pens, there are many functions, such as checking for broken wires when not charged, distinguishing between zero and live wires, distinguishing between the positive and negative poles of DC batteries, and determining whether wires are short circuited. Therefore, ordinary electric pens have gradually become obsolete. If digital electric pens are used to distinguish between live and zero wires, they can directly measure the live and zero wires with an electric pen and observe the voltage of the digital electric pen, 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 zero wire
Induction breakpoint measuring pen: The main function of a breakpoint pen is to locate the internal breakpoint of the line after the wire is not powered on. The breakpoint pen distinguishes between the live and zero lines, and uses the breakpoint pen to measure the live and zero lines separately. When measuring the live line, the sound emitted by the breakpoint pen is relatively rapid, while the sound emitted by the zero line is relatively slow.
For a multimeter, there is an AC voltage range. For an AC voltage range, the voltage of the AC power can be measured. When measuring the voltage, a red and black probe is used, placed on the live and zero lines 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 voltages, the multimeter should be placed in the AC voltage range of 700V
For AC voltage levels, not only can voltage be measured, but it can also distinguish between live and zero lines. It's just that many people don't know. A multimeter distinguishes between a live wire and a zero wire. Place the multimeter in the AC voltage range, place the black lead on one side, and use the red lead to measure the live wire and zero wire separately. Observe the numbers on the multimeter, and the ones with larger numbers are the live wire and the ones with smaller numbers are the zero wire. If you feel that the numbers are not very obvious, you can adjust the range to a smaller one, so that the numbers will be more obvious.
