In addition to measuring basic parameters such as voltage, current, resistance, capacitance, and inductance, digital multimeters can be adapted for various uses, expanding their functionality to achieve a multi-purpose tool. Here is a method for using a digital multimeter to determine internal breakpoints in wires and cables: when there is an internal break in the wire or cable, the exact location of the break is difficult to determine due to the insulation layer. However, this can be easily resolved using a multimeter.
Specific Method: Connect the wire with a breakpoint to the 220V live wire, leaving the other end suspended. Set the digital multimeter to the 2V AC range. Hold the black probe tip with one hand while using the other hand to slowly move the red probe along the insulation. At this point, the meter displays 0.44V. When you move to a certain point, the voltage drops by a few tenths of a volt. The breakpoint is located a few millimeters forward from that position.
I found this article online and thought it was good, so I wanted to share it with everyone. I conducted an experiment and found that measuring wires works well, but measuring cables is less effective mainly due to the thick insulation, which keeps the probe tip far from the metal core. I attached a piece of aluminum foil tape to the tip of the red probe to increase the testing area, and the results were excellent. Another method for detecting wire breakpoints is to connect a tape recorder’s magnetic head wire to the audio input, placing the magnetic head against the outer insulation of the wire being tested, which is connected to the 220V live wire. You can hear a buzzing sound in the speaker, which disappears at the breakpoint. Friends who are interested can give it a try. See the attached image.
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