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Method for calibrating and evaluating GTEM (Gigaherts Transverse Electro Magnetic) cell based on EMI (Electro Magnetic Interference) noise analysis

A technology of noise analysis and calibration methods, applied in the direction of measuring devices, instruments, measuring electrical variables, etc.

Inactive Publication Date: 2013-12-25
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to overcome the defects of the existing GTEM cell test based on EMI noise analysis, the present invention firstly proposes a calibration method of a GTEM cell based on EMI noise analysis, the method at first proposes a polynomial model of GTEM cell radiation electromagnetic interference noise measurement, according to 3m Standard test results in an anechoic chamber, calibrated to a GTEM cell using an ANOVA-based error compensation method

Method used

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  • Method for calibrating and evaluating GTEM (Gigaherts Transverse Electro Magnetic) cell based on EMI (Electro Magnetic Interference) noise analysis
  • Method for calibrating and evaluating GTEM (Gigaherts Transverse Electro Magnetic) cell based on EMI (Electro Magnetic Interference) noise analysis
  • Method for calibrating and evaluating GTEM (Gigaherts Transverse Electro Magnetic) cell based on EMI (Electro Magnetic Interference) noise analysis

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Embodiment Construction

[0049] The method of the present invention will be described in further detail below in conjunction with specific examples.

[0050] In this specific embodiment, a double-layer PCB containing a crystal oscillator is used as the measured object. The frequency of the crystal oscillator in the circuit is 10MHz. Through an external 9V battery, the power converter TD1410 reduces it to a crystal oscillator with a 5V DC voltage of 10MHz. The power supply is supplied by the device, the resistance is 50Ω, and an additional cable of 20cm is connected. The PCB adopts a double-layer structure, which is two layers of signal lines and ground lines.

[0051] Firstly, the circuit is tested in a 3m anechoic chamber, and the test results of the radiated electromagnetic field are as follows: image 3 shown.

[0052] Then, place the circuit on the turntable of the GTEM cell, and connect the GTEM cell to a spectrum analyzer to test the port output voltage. The schematic diagram of GTEM cell tes...

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Abstract

The invention discloses a method for calibrating and evaluating a GTEM (Gigaherts Transverse Electro Magnetic) cell based on EMI (Electro Magnetic Interference) noise analysis, belonging to the technical field of electromagnetic compatibility. According to the method disclosed by the invention, a multinomial model is provided for extracting a radiation EMI noise of the GTEM cell, a variance of calculated data of the model and standard data can be analyzed, thus the model can be subjected to error compensation so that the GTEM cell can be calibrated, and the calibration method can be evaluated based on a high-order moment analysis method. The method for calibrating and evaluating the GTEM cell based on the EMI noise analysis, disclosed by the invention, has the advantages of simplicity and convenience, speediness, high practicality and capability of increasing the measuring accuracy of the radiation EMI of the GTEM cell.

Description

technical field [0001] The invention relates to a method for calibrating and evaluating a GTEM (Gigaherts Transverse Electro Magnetic) cell based on EMI (Electro Magnetic Interference, electromagnetic interference) noise analysis, and belongs to the technical field of electromagnetic compatibility. Background technique [0002] At present, the radiated electromagnetic interference test devices specified in the EMC standards are mainly open field (OAT), anechoic chambers and semi-anechoic chambers, and these devices have very high requirements for radiated electromagnetic interference tests and are expensive. Therefore, it is necessary to find a radiated electromagnetic interference test method that is relatively cheap and can replace the open field or anechoic chamber. [0003] The IEC61000-4-20 standard has used the GTEM cell as an alternative device for the radiated emission test of the electrically small-sized EUT (Equipment Under Test, equipment under test). Due to its w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00
Inventor 褚家美戎融
Owner SOUTHEAST UNIV
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