Electromagnetic interference testing apparatus

Details Electromagnetic interference testing apparatus Electromagnetic interference testing apparatus

1992-03-13

1995-07-04

Hajec, Donald

Communications: radio wave antennas

Antennas

Measuring signal energy

H01Q 1700, G01R 3100

Patent

active

054304563

ABSTRACT:
A transverse electromagnetic (TEM) cell for measuring EM emissions. The TEM cell longitudinal axis is positioned at a fixed angle relative to the horizontal. This fixed angle results in the alignment of the orthoaxis of the TEM cell with the gravity vector. A rotatable platform for supporting an electronic device is positioned inside the TEM cell. The platform is mounted horizontally, and its axis of rotation is vertical (i.e. parallel to the gravity vector). Further, the rotation axis of the rotatable platform intersects the test volume of the TEM cell. Three mutually orthogonal components of EM emissions are measured successively by placing a device on the platform and rotating the device through two 120 degree rotations, thereby measuring three positions. Thus, it is not necessary to tilt the device from a normal, horizontal operating position in order to fully test its EM emissions.

REFERENCES:
patent: 4754496 (1988-06-01), Fishkin et al.
patent: 4837581 (1989-06-01), Hansen et al.
patent: 4968983 (1990-11-01), Maeda
patent: 5001494 (1991-03-01), Dorman et al.
"Simplifying EMI Immunity (susceptibility) Tests in TEM Cells" by Edwin L. Bronaugh, Principal EMC Scientist, The Electro Mechanics Company, published in Proceedings of IEE, 1990 (month unknown) pp. 488-491.

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