B-1
Annex B: Exposure STD mode
Technical background
Health and safety standards prescribe various methods for determining field
exposure, where the reference values stated in the standard are compared
with the measured values:
In calculating the exposure, this means:
The result of the exposure calculation is always expressed as a percentage
of the reference value. If the measured value is exactly the same as the
reference value, the result is “100 %”. Smaller values directly indicate that
the limit has not been exceeded. It is therefore not necessary to express the
result in units of field strength (mT) to assess the exposure level.
For this reason, the result displayed in “Exposure STD” mode is not the
measured field strength but rather the exposure level in percent as already
calculated. There is no need to find out the reference value from the
standard and calculate the exposure level.
Derivation of exposure calculation in
Exposure STD mode
The reference values are specified in the form of tables or curves in the
various standards. This information can be split into different components
for the purposes of further discussion:
• Limit value curve frequency dependency
• Limit value curve field strength dependency (exposure range)
The function of “Exposure STD” mode is illustrated by taking these items
separately.
Bmeas Bref≤
Bmeas
Bref
-----------------
1 (100 %)≤
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