User Guide
Health and Safety
Health and Safety 149
(IEEE). In both cases, the recommendations were developed by scientic and
engineering experts drawn from industry, government, and academia after
extensive reviews of the scientic literature related to the biological effects of RF
energy.
The RF exposure limit set by the FCC for wireless mobile phones employs a unit
of measurement known as the Specic Absorption Rate (SAR). The SAR is a
measure of the rate of absorption of RF energy by the human body expressed in
units of watts per kilogram (W/kg). The FCC requires wireless phones to comply
with a safety limit of 1.6 watts per kilogram (1.6 W/kg).
The FCC SAR limit incorporates a substantial margin of safety to give additional
protection to the public and to account for any variations in measurements.
SAR tests are conducted using standard operating positions accepted by the
FCC with the phone transmitting at its highest certied power level in all tested
frequency bands. Although the SAR is determined at the highest certied power
level, the actual SAR level of the phone while operating can be well below the
maximum reported value. This is because the phone is designed to operate at
multiple power levels so as to use only the power required to reach the network.
In general, the closer you are to a wireless base station antenna, the lower the
power output of the phone.