Diagnostics of the Operation of Technical Means by the Structure of Their External Electromagnetic Fields

The possibilities of diagnosing the operation of technical means using the structure of their external electromagnetic fields have been considered. An overview of existing methods of such diagnostics has been made. A schematic diagram of a diagnostic device based on the strengths of external electromagnetic fields has been proposed. An example of using the proposed diagnostic device has been given. Similar devices for diagnostics of external physical fields of technical means have been recommended.