Apparatus and method for measuring EMI level of electronic...

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Parameter related to the reproduction or fidelity of a...

Reexamination Certificate

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C324S613000, C375S346000

Reexamination Certificate

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07002359

ABSTRACT:
An apparatus and a method for measuring an electric magnetic interference (EMI) level of a radio frequency device is disclosed. The apparatus for measuring a level of electric magnetic interference (EMI) with an electronic device to radiate an electromagnetic wave, the apparatus including: a test device for outputting a signal in response to the electromagnetic wave radiated from the electric device; a calculating unit for calculating a group_delay variation information of the test device by using the signal from the test device; a processor for storing a reference group_delay variation; and an analyzer for analyzing the level of EMI by comparing the reference group_delay variation information and the group_delay variation information.

REFERENCES:
patent: 2002/0190725 (2002-12-01), Craven
Satoshi Ogasawara, et al., “Measurement and Reduction of EMI Radiated by a PWM Inverter-Fed AC Motor Drive System”, IEEE Transactions on Industry Applications, vol. 33, No. 4, Jul./Aug. 1997 (1019-1026).
Leopoldo Angrisani et al., “A Technique for Electromagnetic Interference Measurements on Instruments”, , IEEE Transactions on Industry Applications, vol. 33, No. 4, Jul./Aug. 1997 (925-929).

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