Title :
Insertion loss measurement of a ferrite clamp used in the CISPR 22 radiated emission measurements
Author :
Jitoh, Yuji ; Fujii, Katsumi ; Matsumoto, Yasushi ; Gotoh, Yositaka ; Sugiura, Akira ; Yamanaka, Yukio
Author_Institution :
Tohoku Univ., Sendai, Japan
Abstract :
The CISPR published an amendment to CISPR 22 for requesting ferrite clamps attached on EUT cables and specified the insertion loss of the clamps. But there are no specifications for the insertion loss measurement. Hence, theoretical and experimental investigations have been carried out to develop an appropriate measurement method with requisite measuring instruments. A 150 Ω instrument consisting of a cylindrical rod and a ground plane is proposed. Then, the measurement uncertainty is evaluated with respect to the errors attributable to (1) the position of ferrite cores under measurement, (2) the characteristic impedance of the measuring instrument, and (3) the eccentric displacement of a ferrite core. In addition, more accurate measurements are carried out using the TRL calibration procedures.
Keywords :
electric noise measurement; electromagnetic interference; ferrite devices; loss measurement; magnetic cores; measurement uncertainty; 150 ohm; CISPR 22 radiated emission measurements; EUT cables; cylindrical rod; errors; ferrite clamp; ferrite core eccentric displacement; ferrite cores; ground plane; impedance; insertion loss; insertion loss measurement; measurement uncertainty; measuring instruments; Cables; Clamps; Displacement measurement; Ferrites; Impedance measurement; Insertion loss; Instruments; Loss measurement; Measurement uncertainty; Position measurement;
Conference_Titel :
Electromagnetic Compatibility, 2002. EMC 2002. IEEE International Symposium on
Conference_Location :
Minneapolis, MN, USA
Print_ISBN :
0-7803-7264-6
DOI :
10.1109/ISEMC.2002.1032438
