How do I use a multimeter to check if a wire has a short or a ground?
Uses of a multimeter
1. Use the multimeter to detect the break point in the wire.
As the outer layer of the wire wrapped with insulation skin, the internal breakpoints are difficult to see, with the traditional multimeter detection is very troublesome, need to use the power block, a section of the test, time-consuming but also very easy to break the wire. And now the digital one is much simpler, connect one end of the wire with the phase wire, the other end is suspended. One hand pinch the tip of the black pen, the other hand holding the red pen, so that the tip of the wire along the insulation layer slowly from the end of the phase line connected to start moving backward. When the multimeter's voltage reading suddenly becomes small (equivalent to one-tenth of the original reading), from here back to the 15CM is the break point of the wire.
With this method only need to destroy a point of the wire to solve the problem, is not very convenient ah. This method can also be used to detect the break point of the electric blanket.
2. Use a multimeter to detect short-circuit faults in the circuit.
When the family's circuit has broken wires or circuit aging caused by a short circuit between the firewire and zero line, generally this short circuit point is difficult to determine where, then the resistance method with a multimeter can be easily found. After the line short circuit, you should disconnect the main switch, unplug all electrical appliances. The multimeter is placed in the resistance file, the two pens are connected to the fire line and zero line, if the resistance value is zero or very small can be concluded that the short circuit. It is necessary to measure the resistance value between the fire wire and the zero line section by section, if necessary, you can cut off a section of wire to determine the short-circuit point.
How to use a multimeter to check whether the line is shorted or grounded
Visible from the above, the use of a multimeter to measure the short circuit is very convenient, with a multimeter to measure the ground is not so accurate, in fact, should be used to shake the meter is the most reasonable, the following to give you an introduction to how to use a multimeter to check the line is short-circuited or grounded.
First to say to you about the short circuit: in fact, the problem itself is problematic, we know that the line of the short circuit refers to the normal operation of the power system outside of the phase and the phase between, phase and the ground between the connection; so the phase line of the grounding is also considered a short-circuit one, the zero line if the grounding of the leakage current will be generated, leakage protector tripped, so the question is not very rigorous, personal understanding of the question he wanted to ask the line of the short-circuit and leakage of power how to Detection.
