The effect of cable geometry on the reproducibility of EMC measurements

Author

van Wershoven, Mrs Loes

Author_Institution

Philips Semicond. Syst. Lab., Eindhoven, Netherlands

Volume

2

fYear

1999

fDate

1999

Firstpage

780

Abstract

With respect to the reproducibility of EMC measurements and measurement uncertainty, an analysis of the deviation of cable transfer characteristics has been carried out. This paper shows some examples of the deviations by varying the length, height and manner of meandering of mains cables, which is far beyond the tolerance of 3.5 dB given for the measurement uncertainty limit for conducted emission measurements by IEC CISPR/A. For up to 30 MHz, the deviation varies between 0 and 10 dB, depending on the EUT´s impedance. For cables meandered to a bundle or bifilair meandered on a board, notches down to -30 dB occur. Large variations in measurement results due to set-up geometries are also described

Keywords

building wiring; cables (electric); electric impedance; electromagnetic compatibility; measurement standards; measurement uncertainty; multiconductor transmission lines; radiofrequency interference; transmission line theory; 30 MHz; EMC measurements reproducibility; EUT impedance; IEC CISPR/A; RF conducted emission measurements; bifilair cables; bundle cables; cable geometry; cable transfer characteristics; height; length; meandering mains cables; measurement results; measurement uncertainty; multiconductor transmission line; set-up geometries; Area measurement; Electromagnetic compatibility; Geometry; IEC standards; Impedance; Measurement uncertainty; Power cables; Radio frequency; Reproducibility of results; Transmission lines;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Compatibility, 1999 IEEE International Symposium on

Conference_Location

Seattle, WA

Print_ISBN

0-7803-5057-X

Type

conf

DOI

10.1109/ISEMC.1999.810118

Filename

810118