Effect of low meter impedance on loop-antenna based measurements of magnetic fields

Author

Roman, John ; Ungvichian, Vichate ; Neelakanta, Perambur S.

Author_Institution

Dept. of Electr. Eng., Florida Atlantic Univ., Boca Raton, FL, USA

Volume

34

Issue

2

fYear

1992

fDate

5/1/1992 12:00:00 AM

Firstpage

136

Lastpage

138

Abstract

In using a simple loop-antenna for the measurement of low-frequency magnetic fields, systematic errors (of the order of 20%) could arise if a low impedance (50 Ω) meter is substituted in lieu of a high-impedance type. Nonconsideration of this error in recommended measurement practices and procedures (such as the SAE specification) for radiated emissions is indicated. Theoretical results indicating the systematic error computed over a frequency range of 30 Hz to 25 KHz are presented. Supporting experimental data concerning the loop impedance measurements and the difference in loop-antenna output voltage noticed with low and high impedance meters confirm the theoretical elucidations

Keywords

biological effects of fields; electric impedance; loop antennas; magnetic field measurement; measurement errors; 30 Hz to 25 kHz; 50 ohm; SAE specification; biological effects of fields; loop-antenna; low meter impedance; low-frequency magnetic fields; magnetic field measurement; output voltage; radiated emissions; systematic errors; Antenna measurements; Apertures; Equivalent circuits; Frequency; Impedance measurement; Magnetic field measurement; Magnetic shielding; Message-oriented middleware; Voltage; Wire;

fLanguage

English

Journal_Title

Electromagnetic Compatibility, IEEE Transactions on

Publisher

ieee

ISSN

0018-9375

Type

jour

DOI

10.1109/15.135628

Filename

135628