Title :
The effect of cable geometry on the reproducibility of EMC measurements
Author :
van Wershoven, Mrs Loes
Author_Institution :
Philips Semicond. Syst. Lab., Eindhoven, Netherlands
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;
Conference_Titel :
Electromagnetic Compatibility, 1999 IEEE International Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-5057-X
DOI :
10.1109/ISEMC.1999.810118
