Shielding effectiveness testing system for near-zone low-frequency strong magnetic field and testing method thereof

Abstract

The invention provides a shielding effectiveness testing system for a near-zone low-frequency strong magnetic field, which comprises the following components: 1) a low-frequency high-current source and a transmitting ring antenna for generating and transmitting magnetic field signals; and 2) a receiving ring antenna for receiving and processing the magnetic field signals, a receiver and a computer with Matlab software and visual software. The system has the following technical effects: 1) the system can simulate main characteristics of low-frequency low-impedance strong magnetic fields in a frequency range of (30-1k) Hz; 2) the system has strong anti-jamming capability, large measuring dynamic range, small volume and convenient carry, and can enter the interior of a project to directly measure a shielding chamber; 3) the system provided with the visual software with simple operation and flexible use can realize integration of data acquisition and data processing of magnetic field receiving equipment; and 4) the system has good instantaneity during testing, and can be used for detection of material shielding performance in the project and quality inspection and acceptance of an electromagnetic shielding chamber.

Description

technical field The invention relates to a shielding effectiveness test system and a test method thereof, in particular to a test system and a test method for measuring the shielding effectiveness of an electromagnetic shielding room to a low-frequency strong magnetic field in the near area. Background technique Low-frequency magnetic field interference is a kind of interference that is difficult to shield. Generally, the frequency range considered in the design of electromagnetic shielding is above 10kHz. The device used to measure the shielding effectiveness of electromagnetic shielding rooms mainly measures electric fields and high-frequency electromagnetic fields. Frequency bands below 10kHz are generally not considered. GB / T 12190-2006 "Test Method for Shielding Effectiveness of Electromagnetic Shielding Room" specifies the measurement method for shielding effectiveness of shielding room in detail, and the specified frequency band is from 9kHz to 18GHz. As the electrom...

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Problems solved by technology

At present, there is no test system for measuring the shielding effectiveness of electromagnetic shielding rooms against low-frequency strong magnetic fields. Therefore, it is urgent to develop a test system for low-frequency strong magnetic field shielding effectiveness with a large measurement dynamic range, small size and easy to carry.

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