Made in Germany
© Gigahertz Solutions GmbH
14
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.
When using the HF38B, you can set the switch to ”Peak
hold“ and allow for several beam passes to establish the
equilibrium of charging and droop rate of the holding ca-
pacitor. The reading may take a few minutes to stabilize.
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 2008, 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-2008
Peak
measu-
rements
µW/m²
unconspicu-
ous
moderately
conspicuous
very
conspicuous
extremely
conspicuous
< 0.1
0.1 - 10
10 - 1000
> 1000
© Baubiologie Maes / IBN
the safe side, especially at low levels and when DECT phones can definitely be
excluded as source.
