Methods of Measurement of Magnetic Fields in Vehicles for Assessment of Occupant Exposure, 1 Hz to 300 kHz


The test procedures in this SAE Recommended Practice are applicable to the measurement of human exposure to magnetic fields in passenger vehicles, in the frequency range 1 Hz to 300 kHz. The measurements survey magnetic fields at the typical occupant head and trunk positions. The definition of limits is outside the scope of this document, as are methods of calculation of induced body currents and electric fields, calculation of "coupling factors" for non-uniform exposure, and relaxation of limits for exposure of limbs.


Several national and international standards and regulations address human exposure to electromagnetic fields, over various frequency ranges. Additional product-specific exposure standards or regulations may apply to some intentional electromagnetic emitting devices used in vehicles (e.g., personal communication devices). This document was motivated by the need to establish standardized measurement procedures for surveying vehicle fields which may be produced by various electrical sources, loads, and electrical distribution systems, which are not covered by other product-specific standards or regulations. This document addresses the dominant field components produced by vehicles, which are generally low frequency (<300 kHz) and magnetic, for vehicles employing conventional and/or electric propulsion technology.

  • SAE J 2959
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