How to use a multimeter to check whether a wire is broken or not?
1. Measurement by multimeters and other meters with the same function
You can set the multimeter or other meter to the resistance setting, and then put the test leads on both ends of the wire to measure (note that the measurement is done when the power is off)
1. If MΩ or KΩ appears, it means that the line is blocked or disconnected.
2. If there are a few Ω or a few tenths of Ω, it means that the line is connected and there is no disconnection. (Of course, the specific values will vary depending on the length and thickness of your line. The above is for reference only)
2. Electric pen measurement
If it is a home line, it is basically unrealistic to measure both ends of the hidden wire. You can use an electric pen to detect it (measure when the power is on). If there is no power in the neutral line, the electric pen will not light up. If there is electricity in the live line, the electric pen will light up. Pay attention! At this time, you can change the position of the live and neutral wires, and then measure the original neutral wire to see if the pen is lit now. If it is lit, it means that the original neutral wire is not broken. If it is not lit, it means that it is broken. Line.
This situation is often encountered during installation and maintenance. Let’s talk about single-strand wires first. You can use a multimeter at a short distance and measure it above the buzzer. If it is a long distance, the meter needle cannot reach it! Connect a wire to measure; if there is no ready-made wire on site, connect the wire to be measured to the power supply. It must be a live wire, use the 1000-500V range, and check whether there is electricity at the other end. If so, the voltage at the wiring point is the same. If the difference is too large or zero, it means there is poor contact or an open circuit in the middle of the wire! If it is a multi-strand wire (cable), it will be much more convenient to measure according to the above method!
If you want to know which part is broken, you need a digital display test pen. After the wire is powered on (do not connect it to an electrical appliance), you can sense the broken place on the surface of the wire. If there is electricity, it will display 110V, and if there is no electricity, it will display 0. Or not displayed (depending on your digital display test pen, it may be different)! Pay attention to safety when using electricity!
1. Use a multimeter to electrically block the
2. Use a multimeter to check the wind noise.
3. Use the voltage level of a multimeter to check
Use the above methods 1 and 2 to connect the red and black test leads to both ends of the wire to test continuity.
The third method is to connect the power supply, connect the two wires to the zero and live wires respectively, and use red and black test leads to separate them. If there is voltage, it will not break, if there is no voltage, the wire will break.
A multimeter is used to judge various circuit summaries: 1 off, no sound, 2 off, no resistance, 3 off, no voltage, 4 off, no current, 5 off, no signal, 6 off, no loop.
