13 Electromagnetic compatibility Sirona Dental Systems GmbH
Operating Instructions PerioScan
61 95 825 D 3496
40 D 3496.201.03.05.02
13.3 Working clearances
Recommended working clearances between portable
and mobile HF communication devices and the UNIT
The UNIT is intended for operation in an electromag-
netic environment, where radiated HF interference is
checked. The customer or the user of the
UNIT can
help prevent electromagnetic interference by duly
observing the minimum distances between portable
and/or mobile HF communication devices (transmitters)
and the
UNIT. These values may vary according to the
output power of the relevant communication device as
specified below.
For transmitters whose maximum nominal output is not
specified in the above table, the recommended working
clearance d in meters (m) can be determined using the
equation in the corresponding column, where P is the
maximum nominal output of the transmitter in watts (W)
specified by the transmitter manufacturer.
Remark 1
The higher frequency range applies at 80 MHz and
800 MHz.
Remark 2
These guidelines may not be applicable in all cases.
The propagation of electromagnetic waves is influenced
by their absorption and reflection by buildings, objects
and persons.
Nominal transmitter output
[W]
Working clearance according to transmission frequency [m]
150 kHz to 80 MHz 80 MHz to 800 MHz 800 MHz to 2.5 GHz
0.01 0.12 0.12 0.23
0.1 0.38 0.38 0.73
11.21.22.3
10 3.8 3.8 7.3
100 12 12 23
d 1.2[]P=
d 1.2[]P=
d 2.3[]P=
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