Gigahertz Solutions HFW59D Instruction Manual page 10

Made in Germany
HF radiation exposure can differ at each point and from all direc-
tions. Even though the HF field strength of a given space changes
far more rapidly than in the lower frequencies, it is neither feasible
nor necessary to measure all directions at any given point.
Since there is no need to look at the display during an overview
measurement, you only need to listen to the audio signal. It is
very easy to walk slowly through in-door or out-door spaces in
question. In doing so, constantly move the antenna or the HF ana-
lyser with attached antenna in each direction. This will provide you
with a quick overview of the situation. In in-door spaces, antenna
movements towards the ceiling or the floor will reveal astonishing
results.
As already mentioned above, the aim of the quick overview
measurement is to identify the zones of local peaks, not to
supply exact data.
Quantitative Measurement
Once the relevant measurement points have been identified fol-
lowing the instructions in the previous section, the quantitative
and precise measurements can be started.
Setting: "Range"
Select the appropriate switch settings as described under "Quick
Overview Measurements": First switch the Range switch to
"max". Only switch to "min" if you're constantly shown very low
values. Basic rule for measurement range selection:
Basic rule for measurement range selection:
As coarse as necessary, as fine as possible
Power densities beyond the designed range of the instrument
(display shows "1" on its left side with the range set to "max") can
still be measured by inserting the attenuator DG20_G10, available
as an optional accessory. By setting the "ext. adapt." switch to 20
dB on your instrument, you will ensure a correct display of the
measurement value (i.e. indication of unit and correct decimal
point).
The optional HF preamplifier HV20_2400G10, to be used as plug-
in into the antenna input socket, increases the sensitivity by a fac-
tor of 100. With the help of this, the meter reaches a theoretical
minimum resolution of 0.01 µW/m². The realistic minimum resolu-
tion is slightly lower due to the noise margin.
Measurement ranges of the HFW59D
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