In the field of human exposure to EMF, two types of limits are given: basic
restrictions and derived limits. Some standards may use different terms for
these two sets of limits. Basic restrictions represent the actual effect of
the exposure and cannot be measured. Basic restrictions are based upon
induced current density at the lower frequencies and SAR at the higher
frequencies. A conservative body model is used to compute the fields that
would produce the basic restrictions. Uniform fields are assumed. The result
is the derived field levels. The body models are conservative enough to
guarantee that compliance with the derived limits will ensure compliance
with the basic restrictions. However, failure to comply with the derived
limits does not necessarily result in non-compliance with the basic
restrictions. For highly non-uniform fields or partial body exposure, it may
not be possible to demonstrate compliance using the derived limits, but it
may be possible to demonstrate compliance with the basis restrictions using
numerical calculations.
Richard Woods
----------
From: [email protected] [SMTP:[email protected]]
Sent: Monday, July 24, 2000 7:27 AM
To: [email protected]
Subject: RF SARs?
Hello listmembers
As a manufacturer of Part 18 equipment, I am looking for some help
in understanding RF exposure’s specific absorption rates (SAR). The
new FCC limits are pretty clear about E- and H- field maxima, but, AFAIK,
only vague about how to determine SARs. I’ve read IEEE C95.1 and parts
of C95.3 and it appears that SAR is not something I can measure in the
field. Is compliance with the field-strength limit(s) sufficient?
WmFlanigan
Ameritherm Inc
Scottsville, NY
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