Guidelines, Limiting And Precautionary Values - Gigahertz Solutions HFW59D Manual

M a d e in G e r m a n y
Identification of HF inflow
As a first step, eliminate sources from within the same room (e.g. wire-
less LAN). Once this is completed, the remaining radiation will origi-
nate from outside. For remedial shielding it is important to identify
those areas of all walls (including doors, windows and window
frames!), ceiling and floor, which are penetrated by the radiation. For
this purpose, one should not stand in the centre of the room, measur-
ing in all directions from there, but monitor the permeable areas with
the antenna (LogPer) directed and positioned close to the wall
is because the antenna lobe widens with increasing frequency. In ad-
dition, reflections and cancellations inside rooms make it difficult and
often impossible to locate the "leaks" accurately. See the illustrating
sketch below!
wall
right!
potentially HF-permeable
part of the wall
antenna
The uncertainty of localization with HF-antennas
The shielding itself should be defined and surveyed by a specialist
and in any case the area covered by it should be much larger than the
leak.
Guidelines, Limiting and
Precautionary Values
The official regulations in many countries specify limits far beyond the
recommendations of environmentally oriented doctors, "building biol-
ogists, and many scientific institutions, and also those of other coun-
tries. They are vehemently criticised, but they are nonetheless "offi-
cial", and often the basis for authorization procedures. The limit value
is frequency-dependent and in the HF range of interest here lies be-
tween 4 and 10 W/m² (1 W/m² = 1,000,000 µW/m²). It is based on an
average value evaluation, which building biologists consider far too
low. The same point of criticism also applies to the official limit values
of other countries, as well as of the ICNIRP (International Commission
on Non-Ionizing Radiation Protection) – the so-called non-thermal ef-
fects of EMF are neglected. These "official" limits are far beyond the
range of this instrument, which is optimized for an accurate measure-
ment of power densities targeted by the building biologists.
Building biology guideline acc. to SBM-2015
Anomaly none
(µW/m²) < 0.1
12
Please note: In this position the readings on the LCD only indicate relative highs
and lows that cannot be interpreted in absolute terms.
28
wall
wrong!
potentiell
durchlässiger
Bereich
antenna
© Baubiologie Maes / IBN
slight strong
0.1-10 10-1000
© Gigahertz Solutions GmbH
12 . That
extreme
> 1000