Site Validation
Seibersdorf Labor GmbH (Radio-Frequency Engineering)
The testing and performance evaluation of EMC test sites requires precision field-strength measurements. Seibersdorf is the European market leader in this business.
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Effectiveness
Shielding
The Sielding Effectiveness (SE) is measured in accordance withMil-Std. 285, NSA 65-6 and EN 50147 1.
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Measurement
Field Uniformity
The purpose of our measurement is to characterise the properties (uniform field area, UFA) of the anechoic room according to IEC 61000-4-3 Ed. 3.1 b or EN 61000 4 3.
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Measurement
Site VSWR
The Site VSWR measurement is done according to CISPR 16-1-4 in the frequency range from 1 GHz to 18 GHz using broadband omni directional antennas in horizontal and vertical polarisation. The volumetric test method is applied (test volume needs to be specified), test distance 3 m - any other distance upon request. The ground plane has to be covered with absorbing material.
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Measurement
Ambient Noise
The Ambient Noise (AN) measurement is done in accordance with CISPR 22 and EN 50022
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Normalised Site Attenuation
NSA
Normalised Site Attenuation (NSA) is measured in accordance with CISPR 16-1-4 and ANSI C63.4 in semi and fully anechoic environment.
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Absorber Lined Shielding Enclosure Measurements
ALSE
Due to on-going work in the standardization committee CISPR D (responsible for CISPR 25) the latest issue CISPR 25 Ed. 4.0 has not been cited to-date. In the meantime we are able to offer two different validation procedures:
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Validation
Freespace VSWR
The Free Space VSWR validation is done according to J.S. Hollis, T.J. Lyon, L. Clayton: "Microwave Antenna Measurement", Scientific-Atlanta Inc., Atlanta, Georgia, USA, July 1970.
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Validation
Table Influence (TI)
The Table Influence (TI) is measured according to CISPR 16-1-4 in the frequency range 200 MHz 18 GHz.
