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In order to ensure the safety of EMU, need to detect the fault of EMU real-time when it is running, for find out the fault of EMU’s logic control circuit in time, especially for the stochastic and instantaneous faults of EMU. We research on the method of the stochastic and instantaneous faults detection and capture for fast pulse signal and design a on-board equipment of fault detection. The equipment adopt a high speed sample-and-hold circuit based on a single chip computer system With the use of the on-board equipment of fault detection and the multi - channel oscilloscope recorder, We test the control signals real-time at key nodes of the EMU’s logic control circuit on the scene, then give out the analysis conclusion of the test results. This paper gives out the reference of Electro Magnetic Compatibility(EMC) of high speed EMU’s logic control circuit and the primary grope to improve the EMU’s electromagnetic environment.