Title :
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
fDate :
5/1/1992 12:00:00 AM
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;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
