Cable product inspection is to strictly implement the national product quality policy and ensure the quality system of wire and cable products. Practice has proved that the quality of wire and cable products is related to the safety of electricity use, the improvement of people's living quality and the reputation of enterprises. However, the high-yield and high-quality wire and cable products are not only judged by inspection, but the wire and cable manufacturers should judge the quality of products through years of innovative inspection standards in the design and production process. The product quality is the comprehensive reflection of the enterprise. It is the responsibility of the wire and cable manufacturers to improve the quality of the wire and cable products. To improve product quality, we must implement total quality management and rely on the masses to ensure product quality. Product quality inspection is not only an important part of total quality management, but also an indispensable link for wire and cable manufacturers to ensure product quality in the production process. It is an important means to ensure product quality.

　　A simple method for testing the quality of coaxial cable

　　The insulation medium of the whole inspection standard is a circular coaxial cable with cross-section. The outer conductor of the cable is fixed to the outer surface of the insulation medium with aluminum foil. The rounder the entire outer surface of the medium, the smaller its outer foil, the larger the gap, the less the circular gap. Practice has proved that the smaller the gap, the better the performance of the cable. In addition, air easily enters the large gap shield and affects the service life of the cable.

　　In addition to effectively measuring the basic characteristic parameters such as working voltage, current, resistance, capacitance and transistor, we can also develop the management function requirements through some modifications and use to further research and expand, so as to achieve the goal of multi-purpose of one meter. This paper presents a method to detect and judge the breakpoint of wire connecting cable with digital network multimeter. When the cable or the internal control of the cable has such a disconnection fault, the exact geographical location information of the disconnection is not easy to determine due to the wrapping of the insulation skin of the external equipment of the enterprise. Whether this technical problem can be easily solved with a digital multimeter. Specific teaching method: connect one end of the wire (cable) with a breakpoint to the live wire of 220V mains, and the other end is suspended. Pull the digital multimeter to the ac2v position, start from the live wire access end of the wire (cable), hold the pen tip of the black probe with one hand, and slowly move the red probe along the insulating skin of the wire with the other hand. At this time, the voltage displayed on the electronic display screen is about 0.445v (measured by dt890d meter). When the red probe moves to a certain place, the voltage displayed on the display screen suddenly drops to 0.0 volts (about one of the original voltages). The breakpoint of the wire (cable) is about 15cm forward from the position (live wire access end).