The low-frequency cable assembly generally consists of a cable connected to one or two rf coaxial connectors. Low frequency cable components can only be transmitted in low frequency bands due to transmission performance limitations of coaxial connectors or cables. The rf low frequency range usually refers to DC-6ghz. Cable assembly is a very important part of transmission system, its performance will seriously affect the quality of transmission system. The performance of the cable assembly depends not only on the performance of the cable and the connector respectively, but also on the connection process of the connector. Low frequency cable components are widely used in microwave equipment, radio equipment, electronic instruments and many other fields because of their high cost performance in the low frequency range.