Exposure Limits; Limits For Personal Safety - Aaronia NF-5030S Manual

14.0 Exposure limits

14.1 Limits for personal safety

There are international recognized limits for power wires and the appliances
connected to them, as well as various precautionary limits and recommendati-
ons. Depending on the country, professional sector or the various interest
groups, however, they all can differ significantly.
The German exposure limits are dictated by the Regulierungsbehörde für
Telekommunikation und Post (Reg TP, roughly: regulating body for telecommu-
nications and post), which is a subsidiary of the Bundesministerium für
Wirtschaft und Arbeit (BMWA, roughly: ministry of commerce and labour). Most
national and international bodies recognize these recommendations. They are
part of the German "26. BimSchV" (ordinance for electromagnetic fields) and fol-
low the international ICNIRP recommendation.
The German exposure limits are intended for quadratic means of measurements
taken during intervals of 6 minutes and subdivided by frequency ranges.
Furthermore, there are seperate limits depending on the group of persons affec-
ted. As an example, we will use the limit for the "generic population":
Frequency
Below 1 Hz
1-8 Hz
8-25 Hz
0,025-0,8 kHz
0,8-3 kHz
3-150 kHz
0,15-1 MHz
1-10 MHz
10-400 MHz
Firmware V 1.0 / © 2005-2013 by Aaronia AG, D-54597 Euscheid, www.aaronia.com
E-field [V/m] H-field [µT]
- 40.000
10.000 40.000 / f
10.000 5.000 / f
250 / f 5 / f
250 / f 6,25
87 6,25
87 0,92 / f
87 / f 0,92 / f
27,5 0,092
M-field [A/m]
32.000
32.000 / f²
4.000 / f
4 / f
5
5
0,73 / f
0,73 / f
0,073
The chart on the left graphically
represents, among others, the
before mentioned formulas for H
fields over a frequency range
from 0Hz to 400MHz. The curve
clearly indicates that the wide-
ly used, cheap broadband
testers CANNOT determine
these exposure limits properly
as they do not take signal fre-
quency into account.
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