In addition to the measurement of basic parameters such as voltage, current, resistance, capacitance and transistor, the digital multimeter can be further modified to make its function further expanded to achieve the purpose of multi-use. A method of judging the breakpoint of a wire and cable using a digital multimeter is now given. When there is a wire breakage inside the cable or cable, the exact position of the wire break is not easy to determine due to the wrapping of the outer insulation.
This problem can be easily solved with a digital multimeter. Specific method: Connect one end of the wire (cable) with a breakpoint to the 220V mains line and the other end to hang. Pull the digital multimeter to the AC2V gear, start from the live wire end of the wire (cable), pinch the tip of the black test pen with one hand, and slowly move the red test pen along the insulation of the wire with the other hand. The voltage displayed on the screen is approximately 0.445V (measured by the DT890D meter). When the red test pen moves to somewhere, the voltage displayed on the display suddenly drops to 0.0 volts (approximately one tenth of the original voltage), from which the wire is about 15 cm forward (the firewire access end). Cable) The breakpoint is located. When the shield wire is inspected by this method, if the core wire is broken and the shield layer is not broken, this method is powerless.
This problem can be easily solved with a digital multimeter. Specific method: Connect one end of the wire (cable) with a breakpoint to the 220V mains line and the other end to hang. Pull the digital multimeter to the AC2V gear, start from the live wire end of the wire (cable), pinch the tip of the black test pen with one hand, and slowly move the red test pen along the insulation of the wire with the other hand. The voltage displayed on the screen is approximately 0.445V (measured by the DT890D meter). When the red test pen moves to somewhere, the voltage displayed on the display suddenly drops to 0.0 volts (approximately one tenth of the original voltage), from which the wire is about 15 cm forward (the firewire access end). Cable) The breakpoint is located. When the shield wire is inspected by this method, if the core wire is broken and the shield layer is not broken, this method is powerless.
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