| 摘要 |
FIELD: physics. ^ SUBSTANCE: display has in a housing a motherboard and three printed-circuit boards with printed electric dipole antennae and wire coils with a ferromagnetic core - magnetic field sensors, preamplifiers, low-pass filters, output amplifiers of antenna boards, analogue-to-digital converters of the master microcontroller, a liquid-crystal display and an acoustic radiator. Two antenna boards meant for field components in the horizontal plane are directed in a mutually perpendicular direction, and the third antenna board meant for the vertical field component deviates from the mutually perpendicular direction relative the two antenna boards. Outputs of the antenna boards are connected to inputs of the microcontroller with analogue-to-digital converters. One of the outputs of the microcontroller is connected to the input of the amplifier, the output of which is connected to the acoustic radiator. Outputs of the voltaic element are connected to the input of the voltage converter, the output of which is connected to the other input of the microcontroller, and control buttons are also connected to one of the inputs of the microcontroller. ^ EFFECT: simple design, isotropic simultaneous measurement of electric and magnetic field strength at industrial frequency. ^ 2 dwg |
