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❑
The theoretical field strength of fixed trans-
mitters such as radio telephone and mobile
agricultural radio equipment base stations,
amateur radio transmitters, AM and FM ra-
dio and TV transmitters cannot be precisely
determined in advance. In order to deter-
mine the electromagnetic environment in
respect of fixed transmitters, a study of the
location should be considered. If the meas-
ured field strength at the location of the
THERA-vital exceeds the compliance lev-
els, the THERA-vital should be observed to
verify that it is functioning as intended. If
unusual performance characteristics are
observed, additional measures may be re-
quired such as modifying or changing the
location of the THERA-vital.
❑
Above the frequency range of 150 kHz to
80 MHz the field strength should be less
than 3 V/m.
Recommended safe distances between portable and mobile equipment,
high-frequency telecommunications equipment and the THERA-vital
The THERA-vital is intended for operation in the electromagnetic environment specified below.
The THERA-vital owner or user can help to prevent electromagnetic interference by observing
the minimum distances between portable and mobile high-frequency telecommunications
equipment (transmitters) and the THERA-vital as specified below (according to the output
power of the communication device).
Rated output of
Safe distance based on transmission frequency
transmitter
[m]
[W]
150 kHz to 80 MHz
d = 1.17
0,01
0.12
0,1
0.37
1
1.17
10
3.70
100
11.70
For transmitters whose rated output is not specified in the above table, the distance can be de-
termined using the appropriate equation in each case and in which P is the rated output of the
transmitter in watts (W) as stated by the transmitter manufacturer.
NOTE 1 :
For calculating the recommended safe distance from transmitters within the frequency range
of 80 MHz to 2.5 GHz an additional factor of 10/3 was applied. That reduces the likelihood that
a mobile/portable communications device inadvertently brought into the patient area will cause
interference.
NOTE 2:
This guidance may not be applicable in all cases. The propagation of electromagnetic energy
is affected by absorption and reflection by buildings, objects and people.
65
80 MHz to 800 MHz
P
d = 1.17
P
0.12
0.37
1.17
3.70
11.70
800 MHz to 2.5 GHz
d = 2.33
P
0.23
0.74
2.33
7.37
23.30
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