palmOne Vision Smart Device Treo 650 User Manual page 303

accuracy, because test measurement and actual use environments are different, and other
variable factors. This inherent variability is known as "measurement uncertainty." When FCC
conducts post-grant testing of a cell phone, FCC takes into account any measurement
uncertainty to when determining whether regulatory action is appropriate. This approach
ensures that when FCC takes regulatory action, it will have a sound, defensible scientific basis.
FDA scientific staff reviewed the methodology used by FCC to measure cell phone RF, and
agreed it is an acceptable approach, given our current understanding of the risks presented by
cellular phone RF emissions. RF emissions from cellular phones have not been shown to present
a risk of injury to the user when the measured SAR is less than the safety limits set by FCC (an
SAR of 1.6 w/kg). Even in a case where the maximum measurement uncertainty permitted by
current measurement standards was added to the maximum permissible SAR, the resulting SAR
value would be well below any level known to produce an acute effect. Consequently, FCC's
approach with measurement uncertainty will not result in consumers being exposed to any
known risk from the RF emitted by cellular telephones.
FDA will continue to monitor studies and literature reports concerning acute effects of cell
phone RF, and concerning chronic effects of long-term exposure to cellular telephone RF (that
is, the risks from using a cell phone for many years). If new information leads FDA to believe that
a change to FCC's measurement policy may be appropriate, FDA will contact FCC and both
agencies will work together to develop a mutually-acceptable approach.
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