Document Type:Technical Results
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Public interest related to exposure to electromagnetic fields in the radio-frequency range has now spanned several decades. Radiofrequency (RF) fields are generated by the use of some types of end-use equipment inside consumer homes, vehicles, workplaces, and in the general public environment. In response to the widespread growth in the use of wireless devices and communications, many types of relatively inexpensive RF exposure meters have become available on the consumer market. This project identified a sampling of RF exposure meters of different manufacturers and specifications available in the marketplace for use by US and international consumers and subjected them to generated RF fields in order to determine their measurement capabilities and limitations.
Because of differences in design, reliability, and functionality, direct comparisons of meters is difficult, especially because meters are designed for so many different applications. One common function of all the meters is to detect the presence of an RF field, but some meters provide little more information than that. Some meters are not able to detect RF fields below a set field strength while others are tuned to a certain frequency range. Consumers need to recognize that each meter’s performance can vary dramatically at different frequencies, distances, and orientation. Such variations can be significant and may limit interpretation of measurement results.
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