New IEEE Standard - Active - Draft. High voltage reactor generates sound during operation due to vibration with the action of electrical and mechanical stress. These sound signals contain rich state information about the reactor. Therefore, the measurement and research into reactor sound signals can aid the evaluation of equipment status. The development of acoustic imaging technology also provides a solid technical foundation for locating abnormal noise in reactors. Acoustic imaging technology allows researchers to obtain the distribution of the sound field of reactor with a microphone array. Combined with knowledge of the reactor structure and operating status, this technology can effectively help researchers determine the position of a sound signal and diagnose the status of reactors. The characteristics of acoustic imaging technology include non-contact measurement, simple operation, and flexible arrangement. The measured results are important for diagnosing reactor status and identifying sound sources. To guide and provide instructions for the testing of on-site acoustic imaging for reactors, this guide is formulated to specify the test methods, provide the basic requirements and describe the test instruments, procedures, test data analysis methods, and data records, while providing guidance for the testing of acoustic imaging for reactor.