Gigahertz Solutions HF32D Mode D'emploi page 13

comparison with the building biology recommendations
you will find different telecommunication services being present at
the same time. With the help of the audio analysis
able to estimate how much of the total value shown is caused by
such high crest factor signals. Depending on the proportion to the
total signal, please apply the following "rules of thumb":
Low portion of "high crest factor signals" audible:
multiply display reading by 2.
~"Fifty-fifty"-ratio: multiply display reading by 5
Dominating "high crest factor signals":
multiply display reading by 10.
Taking into account the multiple external factors of measurement
uncertainty, this approach is perfectly adequate for an assess-
ment of the total pollution. The use of a frequency filter and ser-
vice specific correction factors will allow an increased accuracy.
Radar beams are emitted by slowly rotating antennas. Therefore
they are only measurable and audible for only milliseconds every
few seconds. Due to the extremely fast rise-time of the signal only
a rough estimation of the real signal level is possible:
Set "Signal" to "Peak". Take the highest reading of sever-
al radar beam passes displayed and multiply it by 10.
Smart meters transmit data to the respective providers very ir-
regularly and in pulses, by using the locally available cell phone
services. Additionally there may be pulsed in-house wireless con-
nections. Therefore, it makes sense to keep measuring until you
pick up some pulses, and if necessary, apply correction factors.
Limiting values, recommendations and
precautions
The "Standard der baubiologischen Messtechnik" (Standard for
Building Biology Measurements), SBM 2015, classifies measure-
ments (per radio communication service), with a note of caution
"pulsed signals to be taken more seriously than continuous ones",
as follows:
Building Biology Recommendations as per SBM-2015
Peak
un-
meas-
conspicuous
urements
< 0.1
μW/m²
Even though their standards specify far higher crest factors, the industry strives
for crest limitation for economic reasons, so that the resulting correction doesn't
exceed a factor of 10. For TETRA a factor of 2, for WLAN ("standby-rattling") a
factor 4 is enough.
Mind the internal noise level, where a correction does not make sense.
Applies for HF35C (sound samples on our homepage). When using the HF32D,
the approach would be to multiply the display value by 10 to be on the safe side,
especially at low levels and when DECT phones can definitely be excluded as
source.
© Gigahertz Solutions GmbH
moderately
conspicuous conspicuous
0.1 - 10
Made in Germany
5
, you will be
very extremely
conspicuous
10 - 1000
4
. Often
> 1000
11