Gigahertz Solutions HF58B Instruction Manual page 6

Digital High Frequency Analyser HF58B
horizontally isotropic ultra broad band aerial
down to 27 MHz, the UBB27
© Gigahertz Solutions GmbH, 90579 Langenzenn, Germany
Measurements for a Quick Overview
This is helpful to gain insight into the overall
situation. Since the actual number values are
of secondary interest in this phase, it is usu-
ally best to simply follow the audio signals
which are proportional to the field strength.
(Set" On/Off" switch ("Mode" to:
turn down the audio analysis knob to low).
Procedure for the
Quick Overview Measurement:
The HF analyzer and antenna are to be
checked following the instructions under
"Getting Started."
First set the measurement range ("Range
Selection") switch to "Coarse". Only if the
displayed measurement values are persis-
tently below ca. 0.10 mW/m², change to the
measurement range "Medium" (199.9µW/m²)
or to "Fine" (19.99µW/m²).
Note: When switching from the range
19.99mW/m² to 199.9µW/m², the volume of
the audio signal increases sharply. When
switching from the range 199.9µW/m² to
19.99µW/m² there is no difference in volume.
Set the "Signal Evaluation" switch to "Peak"
HF radiation exposure can differ at each
point and from all directions. Even though the
HF field strength of a given space changes
far more rapidly than at lower frequencies, it
is neither feasible nor necessary to measure
all directions at any given point.
Since this is not an accurate quantitative
measurement, but a quick overview assess-
ment, the antenna can be removed from the
top end of the HF analyzer, for convenience.
Holding the antenna at its very end as de-
Revision 4.5 (December 2006)
scribed in "Getting Started", the polarization
plane (vertical or horizontal) can easily be
changed with a turn of your wrist. However,
you can just as well use the HF analyzer with
the antenna attached to it.
Since there is no need to look at the display
during an overview measurement, you only
, and
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 con-
stantly moving the antenna or the HF ana-
lyzer with attached antenna, in each direc-
tion. This will provide you with a quick over-
view of the situation. In in-door spaces, an-
tenna movements towards the ceiling or the
floor will reveal astonishing results.
As already mentioned above, overview
measurements are not meant to provide
accurate results, but to identify those
zones within which local peak values are
found.
Quantitative Measurement:
Settings
After having identified the relevant measure-
ment points following the instructions in the
previous section. The actual testing can be-
gin.
Setting:
Measurement Range Selection
Select the appropriate switch settings as
described under "Quick Overview Measure-
ments". Basic rule for measurement range
selection:
- As coarse as necessary, as fine as possible.
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