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Technical Data 8
User Guide Electromagnetic interferences 8.4
Art. no.: 0-48-0013 Rev. m
FRED easy
8.4.3 Recommended minimum distances
The FRED easy® is intended to be used in electromagnetic environments in which it
is possible to control radiated HF interferences. The user of the FRED easy® can pre-
vent electromagnetic interferences by always keeping a minimum distance between
portable/mobile HF communication devices (transmitters) and the FRED easy®. The
recommended minimum distances are listed in the following table according to the
transmitters' max. transmitting power.
Max.
transmitting
power of the
transmitter (W)
Distances according to the transmitter's frequency (m)
between 150 kHz and 80
MHz outside of the ISM
frequency band
between 150 kHz and
80 MHz within the ISM
frequency band
between 80 MHz and
800 MHz
between 800 MHz and
2.5 GHz
0,01
Not applicable Not applicable
0,12 0,23
0,1 0,38 0,73
1 1,2 2,3
10 3,79 7,27
100 12 23
For transmitters with a max. transmitting power that is not listed in the above table, the recommended minimum distance d in metres (m) can
be calculated using a formula based on the transmitter's frequency, where P is the max. transmitting power of the transmitter in Watts (W) (ac-
cording to manufacturer data).
Note 1 These guidelines might not always be applicable. Electromagnetic radiation is influenced by absorption and reflection on structures, ob-
jects and people.
Note 2 To calculate the recommended minimum distance of transmitters in the ISM frequency bands between 150 kHz and 80M Hz and
in the frequency band between 80 MHz and 2.5 GHz, the additional factor 10/3 is used to minimise the probability of interferenc-
es caused by mobile/portable communication equipment that accidentally happens to be in the patient environment.
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