3.4 Measuring Exposure Level (General Public)
45
2
3
4
5
6
7
8
9
10
11
12
13
3
The table below shows the measurement and internal processing times
with the slow function on and when it is off.
3.4.2
Exposure Level
• A discussion of acute health effects of exposure must account for cou-
pling factors such as the human body and magnetic fields, threshold
values under basic restrictions and safety factors (reduction factor) for
general public and occupational exposure.
See :
For details, see "Appendix" (P.113).
Slow function on
Measure-
ment
Internal
processing
Measure-
ment
Internal
processing
Measure-
ment
Internal
processing
Measure-
ment
Internal
processing
1 s
1 s
1 s
1 s
1 s
1 s
1 s
1 s
Slow function off
Measure-
ment
Internal
processing
Measure-
ment
Internal
processing
Measure-
ment
Internal
processing
Measure-
ment
Internal
processing
0.12 s
0.13 s
0.12 s
0.13 s
0.12 s
0.13 s
0.12 s
0.13 s
1 s
• Values obtained in an exposure measurement are not measures of the
risk a specific magnetic field poses.
• In Exposure Level function, first order filters are used to approximate
magnetic density flux levels in the ICNIRP guideline. Thus corner fre-
quencies cause a difference of at most 3 dB, but this corresponds to
the "smoothed edges" referred to in IEC/EN62233.
Reference:
In IEC62233, the coupling factor at 10 cm as described in ICNIRP is
"0.14" for small and "0.16" for large ones while the safety factor
(reduction factor) (the reduction factor for public exposure is "50" (1/
50 of the threshold value) for threshold values for occupational expo-
sure is "10" (1/10 of the threshold value).
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