Download Print this page

Gigahertz Solutions HF38B Manual page 11

Rf-analyser
Hide thumbs Also See for HF38B:

Advertisement

Available languages

Available languages

phone network expands every day that causes changes in the
exposure levels.
Minimum distance 2 meters
Due to the physics of wave generation it is not possible to reliably
measure the customary "power density" (W/m²) in the close vicini-
ty of the source of radiation. 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 meas-
urements 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 700 MHz to avoid the
readings being disturbed by lower frequency sources. In order to
measure frequencies below 700 MHz down to 27 MHz the instru-
ments HFE35C and HFE59B are available from Gigahertz Solu-
tions. They come with an active horizontally isotropic ultra-broad
band antenna from 27 MHz up to beyond 3 GHz, the UBB27.
Settings of the Analyser
At first, set "Range" to"19.99 mW/m²". Only if there are constant-
ly very small readings, switch to the next finer range
The basic rule is: as coarse as necessary, as fine as possible.
5
Range": When switching from 'Coarse' to ‚Medium' for very small readings, it
could happen, that the instrument tolerance of +/- 6 dB full range is absorbed. In
this worst case there may be a factor 4 between the displayed numbers in
‚Coarse' and ‚Medium'. Example: In 'Medium' you read 150.0 μW/m². If worst
comes to worst 'Coarse' might show between 0.6 und 0.03 mW/m² (instead of
0.15 mW/m² which would be the correct value). However, normally the differ-
ences shown will be much smaller. For comparing measurements (e.g. 'before'
and 'after') take the same range setting.
© Gigahertz Solutions GmbH
Made in Germany
5
.
9

Advertisement

loading

This manual is also suitable for:

Hf38b-w