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For the instruments described here, the distance should be in excess of 2 meters.
The nature of HF radiation requires a specific approach for each
the determination of the total exposure to it and
the identification of the sources or leaks for the pollution.
Step-by-Step Procedure to Measure the Total Exposure
When testing for HF exposure levels in an apartment, home or property, it is always
recommended to record individual measurements on a data sheet. Later this will
allow you to get a better idea of the complete situation.
Preliminary Notes Concerning the Antenna
As the LogPer Antenna provided with this instrument is shielded against ground
influences, one should “aim” about 10 degrees
below the emitting source subject to
measurement so as to avoid distortions in the area of sensitivity transition (aim
horizontally for moderately elevated targets such as transponder masts).
The analyser suppresses frequencies below 800 MHz to avoid the readings being
disturbed by lower frequency sources. In order to measure frequencies below 800 MHz
down to 27 MHz the instruments HFE35C and HFE59B are available from Gigahertz
Solutions. They come with an active horizontally isotropic ultra broad band antenna
from 27 MHz up to beyond 3 GHz, the UBB27.
This illustration shows you that where the antennae is actually measuring slightly below the
point of interest (where you are interested in measuring )
Settings of the Analyser
The HF32D comes with ‘Range’ and ‘Signal’ already set to values typical for the assessment
of the impact of the HF radiation by building biology standards. Higher power densities
beyond the designed range are indicated by a “1” on the left end of the dis
play. In this case,
the attenuator DG20 (available as accessory) will allow to increase the measurement range
by a factor of 100.
