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In the process of equipment support, fault signal voltage detection is an effective means to quickly locate faults. The radar product combination panel generally reserves fault signal voltage test interface. Some combination test signals are too many, which makes it difficult for users to locate the fault location. A design scheme of modular interface tester based onSTM32 is presented, and its working principle, hardware composition are introduced. The device has a human-computer interaction interface, and for a certain type of radar vehicle combination, it can realize the function of automatically collecting and displaying seventeen voltage signals at one collection. At the same time, the corresponding fault solution to make a pop-up prompt, convenient for users to repair and maintain the equipment. It can also be used for other voltage test. It has the advantages of versatility, small size, light weight, and convenient carrying.