Gigahertz Solutions HFW59D Bedienungsanleitung Seite 24

M a d e in G e r m a n y
interesting numerical value) can be determined. This can be achieved
as follows:
- By scanning "all directions" with the LogPer in order to locate
the direction from which the major HF emission(s) are originating.
Move your wrist right and left, or if necessary up and down, for in-
stance in apartment houses.
- By rotating the HF analyser around its longitudinal axis by up to
90°, so as to determine the polarization plane of the HF radiation.
- By changing the measurement position, therefore avoiding to be
measuring exclusively in one spot, because that spot may have lo-
cal or antenna-specific cancellation effects.
Some manufacturers of field meters propagate the idea that the effec-
tive power density should be obtained by taking measurements of all
three axes and calculating the result. This is not the case when using
LogPer antennas as well as rod or telescopic antennas.
In general, it is well accepted that
exposure limit comparisons should be based on the maximum
value emitted from the direction of the strongest
radiation source. When using the UBB2410 of course,
the directional component will not apply.
To be on the safe side when comparing limit values, multiply the dis-
played value by 2 and use the result as basis for the comparison. This
method is often used by the building biology professionals to avoid
assuming a far lower value of pollution than really existent, especially
if the specified downward tolerance of the meter is fully reached. How-
ever, please be aware of the fact that the so calculated values may be
far too high should the upward tolerance be fully reached.
This measurement uncertainty factor appears to be very high at first, but becomes realistic
when taking into account that the same factor is applied even for professional spectrum ana-
lysers.
Setting: "Range"
First set the Range switch to "max". Only switch to "min" if you're con-
stantly shown very low values.
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 meas-
ured by inserting the attenuator DG20_G10, available as an optional
accessory. By setting the "ext. adapt." switch to 20 dB on your instru-
ment, you will ensure a correct display of the measurement value (i.e.
indication of unit and correct decimal point).
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