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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-fit exceeds the compliance levels,
the THERA-fit should be observed to verify
that it is functioning as intended. If unusual
performance characteristics are observed,
additional measures may be required such
as modifying or changing the location of the
THERA-fit.
❑
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-fit
The THERA-fit is intended for operation in the electromagnetic environment specified below.
The THERA-fit 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-fit as specified below (according to the output power
of the communication device).
Rated output of
transmitter
[W]
Safe distance based on transmission frequency
[m]
150 kHz to 80 MHz
80 MHz to 800 MHz
800 MHz to 2.5 GHz
d = 1.17
d = 1.17
d = 2.33
0,01
0.12
0.12
0.23
0,1
0.37
0.37
0.74
1
1.17
1.17
2.33
10
3.70
3.70
7.37
100
11.70
11.70
23.30
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.
P
P
P
Summary of Contents for THERA-fit
Page 2: ...1 2 3 4 5 6 7 8 9...
Page 3: ...A B C 11 D E F G 10 H 20 cm I J K Reserve...
Page 38: ...35 Notes...
Page 39: ...36 Notes...
