Spark testing machine is an online testing equipment placed in the take-up section of wire and cable production. Its main function is to use frequency voltage to detect whether the wire product has copper leakage, skin impurities, insulation and voltage resistance. The spark testing machine will periodically load the set voltage value onto the insulation line according to a certain pattern, while the conductor part is grounded. This creates a voltage difference between the conductor and the insulation surface, which can detect whether the insulation layer is defective and ensure that the wire and cable products are qualified and leave the factory. The working power supply of spark testing machines is divided into two categories: AC and DC. AC can be further divided into two types based on different working frequencies: power frequency and high-frequency. The testing frequency of power frequency spark machines in China and some international countries refers to 50HZ, while high-frequency spark machines refer to testing frequencies ranging from 2500HZ to 3500HZ; The DC spark machine uses a DC power supply