[en] The radiation generated in the process that the intense electron beam accelerator is running with pseudo load can lead to the black screen of the nearby computer and oscillograph. In this study, the research using experiment method is carried out on this problem. Three radiation periods are demonstrated in the experiment, corresponding to the time when the trigger signal arrives, the primary switch operates and the main switch operates, respectively. The radiation generated when the primary switch operates is larger than that generated when the main switch operates. The radiation in the second period reaches the largest intensity at the same height as the primary switch. The analysis of frequency spectra shows that the radiation in the experiment is mainly concentrated in low frequency range with the main frequency of 21 MHz. (authors)