ELT-400 Annex C: Instrument function
C-3
Peak value
The peak value of the magnetic flux density is calculated from the
variation with time B
x
(t) through B
z
(t) of the magnetic flux density in each of
the three measurement axes.
The peak value always depends on the phases of the measured field
components. For this reason, vectorial addition is used.
Stnd (Standard)
The results in “Exposure STD” mode are expressed as a “percentage of the
limit value”. The detection modes to be used for the measurement are
specified – sometimes within separate clauses – by the relevant personal
safety standards. They are of decisive importance in ensuring that the
results are measured correctly, regardless of the signal shape (multiple or
single frequency fields, pulsed fields).
There are some standards where both the RMS value and the peak value
must be taken into account at the same time in order to determine exposure.
The ELT-400 compares both measurement results continuously and
displays the relevant measured value, applying the prescribed weighting
factor V
max
where necessary.
ˆ
B
ˆ
Max B
x
2
t() B
y
2
t() B
z
2
t()++
=
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