Wire and cable break? How to quickly detect the broken wire fault inside the wire and cable, the exact position of the broken wire is not easy to be determined due to the wrapping of the outer insulation, so we need to find a wire with a broken point, and then we can find the exact position Wire and cable break? How to quickly detect the broken wire fault inside the wire and cable, the exact position of the broken wire is not easy to be determined due to the wrapping of the outer insulation, so we need to find a wire with a broken point, and then we can find the exact position Breakpoint. You can first find the midpoint C of AB, and the cable identification instrument measures whether AC and BC are connected. If AC is not connected, it means that the breakpoint is between AC, and then find the midpoint D of AC, and measure whether AD and CD are connected to each other. , if AD fails, it means that the breakpoint is between AC, and then find the midpoint E of AD, and measure whether there is power between AE and DE.……In this way, after n measurements, the breakpoint can be determined within the online range. PS: In addition to the measurement of basic parameters such as voltage, current, resistance, capacitance and transistor, the digital multimeter can also be used to further expand its functions. The specific method of using a digital multimeter to detect wire and cable breakpoints: First of all Connect the wire with the breakpoint V to the live wire of the mains, and leave the other end floating.
Pull the digital multimeter to the AC2V block, start from the hot wire access end of the wire (cable), hold the tip of the black test lead with one hand, and slowly move the red test lead along the insulating skin of the wire with the other hand. The voltage value displayed on the screen is about 0.445V. When the red test pen moves to a certain place, the voltage displayed on the display screen suddenly drops to a few volts (about one-tenth of the original voltage), and moves forward from this position (the line (cable) breakpoint is located at the fire line cm. When checking the shielded wire with this method, if only the core wire is broken but the shielding layer is not broken, then this method cannot be used.
The following method is only suitable for various cables without shielding layer: induction test pen (that is, with a screen like an electronic watch, which can detect voltage and continuity). How to quickly measure the power supply to the cable around the cable, first rule out the breakpoint, then connect the cable with the breakpoint to the live wire, hold the electric pen perpendicular to the wire, press and hold“Induction breakpoint test”The button moves forward slowly on the wire, and when the AC signal detected by the test pen suddenly disappears, it can be judged that the breakpoint is at the detection point, and the error does not exceed 10cm at most. It should be noted that the cables around the breakpoint wires cannot carry power.
In addition, it should be reminded that this method is not a panacea. The effect of short cables is obvious. The longer the cable, the worse it is. It is a simple method without a cable breaker. Connect one end of the wire with the breakpoint to the black test lead of the multimeter, and the other end to the red test lead. Use the multimeter to set the resistance * 200 ohms.
Bend back and forth where the wire is most likely to break (such as the point of frequent bends). If the multimeter shows that it is on and off, this is the breakpoint. If you still can't judge, you need to start bending from one end of the cable until you find the breakpoint.
This method is suitable for shorter cables. Insert a steel needle into sections on the broken cable, and use a multimeter to measure the continuity between the steel needle and the end of the cable to judge the breakpoint of the cable. It is not recommended to use it under normal circumstances, because it will destroy the insulation layer, and it is easy to cause other problems in the later use of the cable, especially in an environment with high humidity.
This method is to use the continuity of the cable to check the breakpoint of the cable. Use a vise to pull the broken wire at the end of the cable. If the breakpoint is near the end of the cable, the insulation will be easily broken. This method is used for the breakpoint near the end of the cable, such as the driving control button cable.
Wire and cable break.
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