|The International Commission on Non-Ionizing Radiation Protection (ICNIRP) has published guidelines for limiting exposure to electric, magnetic and electromagnetic fields (ICNIRP 1998a, b) and has provided frequency dependent basic restrictions and reference levels from which a hazard assessment for exposures to electric and magnetic fields can be made. This document provides clarification for assessing compliance with the guidelines for pulsed and complex non-sinusoidal waveforms with frequency components predominantly up to 100 kHz. The approaches described may be helpful to product standards setting bodies concerned with metrology. In the frequency range up to 100 kHz there are a number of sources of non-sinusoidal magnetic fields with the potential to exceed the reference levels for exposures specified in the ICNIRP guidelines. Common sources include electronic article surveillance gates, demagnetizers, electronic security systems, and metal detectors, and these generate predominantly magnetic fields. Therefore, this statement focuses mainly on magnetic fields; however, this can be readily extended to electric fields.