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Higher power densities beyond the designed range are indicated
by a "1" on the left end of the display. In this case, the attenuator
DG20 (available as accessory) can be applied and will allow
measurements of 100 times higher fields.
Setting Signal Evaluation ("Signal"): The peak HF radiation val-
ue, not the average value, is regarded as the measurement of
critical "biological effects" affecting the organism and to be com-
pared to recommended safety limits. This is the standard setting!
The average value ("RMS") of pulsed signals is often only a very
small fraction of the peak value. Nonetheless it forms the basis of
most of the "official" safety limits regulations. Building biologists
consider this a trivialization.
„Peak hold"simplifies measurements of the total exposure by
retaining the highest readings for some time (it slowly drops). Note
of caution: Switch on "softly" to avoid switching peaks, which
then will be retained for some time simulating unrealistic power
densities. If peaks are very short and very high the holding capaci-
ty needs an instant until it is fully charged.
How to execute the measurements
Hold the HF analyzer with a slightly outstretched arm, your hand
at the rear of the instrument.
For a rough first overview it is sufficient to probe for areas of
higher levels of radiation simply by following the audio signals
walking through the rooms of interest, directing the analyser eve-
rywhere and rotating it.
Having identified the area of interest for a closer evaluation,
change the positioning of the instrument in order to analyse the
actual power flux density. This is done
by pointing in all directions including upwards and
downwards in flats to establish the main direction of the
incoming radiation,
by rotating the instrument around its longitudinal axis by
up to 90
by shifting the instrument in order to find the point of
maximum exposure and to avoid being trapped by local
cancellation effects.
It is generally accepted to use the highest reading in the room
for comparison with limit or recommended values.
Evaluating the different radio services
The displays of the meters of this series show the sum of the total
power density within the frequency range of the most common
digital radio services. This means for the often dominating
sources of DECT and GSM as well as analogue sources: Simply
take the readings and compare them to the building biology
standard values!
To be able to evaluate the different radio standards and transmis-
sion and modulation patterns with one single measurement tech-
10
°
to also find the plane of polarisation, and
© Gigahertz Solutions GmbH
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