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User manual
Antenna model: AT3000
Rev 6.0 – September 2014
Clampco Sistemi is a registered trademark of
Calzavara SpA
– via Corecian, 60 – 33031 – Basiliano (Italy) http://www.clampco-sistemi.com/
2.1. Radiation protection measurements
The measurement of electric fields which have environmental impact is a complex activity that falls within the
scope of international standards; it is recommended that the following be consulted:
IEC 61566, 1977 “Measurement of exposure to radio-frequency electromagnetic fields strength in the
frequency range 100kHz-1GHz”
ICNIRP “Guidelines for limiting exposure to time varying electric, magnetic and electromagnetic fields up to
300 GHz”
The general procedure to measure electric field with a generic spectrum analyzer for radiation protection of
humans in a selected point of space
1
can be described as follows:
1)
fix the antenna with the radome in the point selected and identify on the spectrum analyzer the i=1,..N
spectral bands of interest (broadcast channels or other sources);
2)
for each channel i choose a time averaging method on the spectrum analyzer (max hold, rms power
average, channel power) defining the particular measurement algorithm recommended by the applicable
regulation;
3)
measure the averaged amplitude of the 3 components
E
i
x
,
E
i
y
,
E
i
z
for each selected channel, then compute
the total electric field of the channel , i.e.
, where i = 1, 2 ..N. The averaging time
and any correction factor to add to the result has to be selected according to the applicable regulation.
Consider that this calculation must be done after the conversion of the spectrum analyzer reading unit
(dBm) into the unit of electric field (V/m), as explained above.
4)
compute the total rms field in the point selected:
, where w
i
are weights defined by
the regulation applied;
5)
compare the result with the admitted electric field limit L
P
defined by the regulation applicable in the point
selected.
1
In general, the criteria for selection of the measurement points and the space averaging method have to be defined
as well.
Содержание AT3000
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