Gigahertz Solutions HF32D Mode D'emploi page 14

Made in Germany
un-
Peak
conspicuous
meas-
< 0.1
urements
In fall 2008 the "Bund für Umwelt und Naturschutz Deutschland
e.V." (BUND) (environmental NGO) recommended a limiting value
of 1 µW/m² even for outdoor situations.
The Landessanitätsdirektion Salzburg (Austrian health authority)
proposed already in 2002 to lower the present "Salzburger Vor-
sorgewert" (precautionary value) to 1 µW/m² for indoor situa-
tions.
Limiting values imposed by governments are mostly considerably
higher. There are indications of rethinking, though. The Internet
provides large collections of recommendations and data.
Note for users of cellular phones: Even below 0.01 µW/m² com-
munication is fully unimpaired.
Identification of the sources of pollution
After determination of the total exposure the next step is to find
out where the radiation enters the examined room. As a first step
eliminate sources from within the same room (e.g. cordless
phones, wireless routers, etc.) Once this is completed, the re-
maining radiation will originate from outside. For remedial shield-
ing it is important to identify those areas of all walls (including
doors, windows and window frames!), of ceiling and floor, which
are penetrated by the radiation. To do this one should not stand in
the centre of the room, measuring in all directions from there, but
monitor the permeable areas with the antenna (LogPer) directed
and positioned close to the wall/ceiling/floor
is that the antenna lobe widens with increasing frequency. In addi-
tion reflections and cancellations inside rooms make it impossible
to locate the "leaks" accurately. See the illustrating sketch below!
Wand
Wall
Mur
Pared
Potentiell durchlässiger Bereich
Potentially permeable Area
antenna
For the definition and installation of shielding measures as well as
surveying their effect, professional advice is recommendable.
Anyway, the area covered by shielding material should be much
larger than the leak itself.
Audio Frequency Analysis (HF35C / HF38B only)
Many different frequencies within the frequency band between
800 MHz and 2.5 GHz, are being used by many different services.
9
Please note: In this position the readings on the LCD only indicate relative highs
and lows that cannot be interpreted in absolute terms.
12
moderately very
conspicuous conspicuous
0.1 - 10 10 - 1000
9
. The reason for this
no!
antenna
© Gigahertz Solutions GmbH
extremely
conspicuous
> 1000
© Baubiologie Maes / IBN
potentiell
durchlässiger
Bereich