Analyzing how to use a folding digital multimeter to find the internal breakpoint of the wire
Folding digital multimeter is a very common power maintenance tool in the electric power field. In addition to measuring voltage, current, resistance, capacitance, inductance, etc., folding digital multimeter can also be used flexibly to expand its functions to achieve material Make the best use of the effect. We often encounter such a situation in the work in our shop: a cable is already known to be in an open circuit state, because the cable is wrapped in insulation, it becomes a difficult thing to find the open circuit point, then we How to use a folding digital multimeter to quickly and accurately find the location of the breakpoint?
If you are looking for a breakpoint on an ordinary wire, connect one end of the wire with the breakpoint to the live wire of 220V, and hang the other end in the air, then adjust the foldable digital multimeter to 2V AC, and hold the black The nib of the pen, and the other hand holds the red pen and slowly moves on the insulation skin of the broken line. At this time, the reading on the folding digital multimeter should be about 0.4V. When the displayed reading drops and is much smaller than the previous reading, the position where the red pen stays at this time is the position where the breakpoint is located.
The above is to find the breakpoint position on the wire, so how do we detect the breakpoint on the cable that is thicker than the wire? In fact, the method is very simple. If we want to check the cable, we only need to fold the red tip of the digital multimeter Paste a piece of aluminum foil tape, in this way we increase the detection area of the folding digital multimeter. Why do you need to paste tin foil tape? This is because the insulation of the cable is thicker, so the distance between the pen and the metal core of the cable becomes longer, so it is necessary to paste tin foil tape on the tip of the pen. It should also be lower than the reading when measuring the wire. The reading of the measuring cable is about 0.32V. When there are too many, the position where the pen tip stays at this time is the position where the breakpoint is located.
