The digital multimeter can measure basic parameters such as voltage, current, resistance, capacitance and transistor, etc. it can also be used flexibly to further expand its function and achieve the purpose of multi-purpose for one meter. Use digital multimeter cable break point method to judge.
When the wire harness breaks down, it is difficult to determine the exact position of the bolt due to the wrapping of the outer insulating sheath. Using a digital multimeter can easily solve this problem. The specific measures are as follows:
1 ) hang one end of the breakpoint wire ( cable ) on the 220 v mains wire while the other end is suspended.
2 ) pull the DMM to ac2v, start from the wire connected to the end of the cable ( cable ), hold the black pen and pen with one hand, move the red pen with the other hand, and slowly move along the insulation layer of the wire. at this time, the display shows the voltage value of about 0.445 v ( measured by dt 890 d meter ).
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3 ) red pens and moving pens, pens and moving to some place, the most popular display shows that the voltage suddenly drops to 0.0 volts ( about one tenth of the original voltage ).
4 ) approach the break point of the ( cable ) beam approximately 15cm forward from the position.
