Synapse Biomedical TransAeris Manuel De L'utilisateur page 84

Recommended Separation Distances Between Portable and Mobile RF Communications
Equipment and The TransAeris Stimulator
The TransAeris stimulator is intended for use in an electromagnetic environment in which
radiated RF disturbances are controlled. The customer or the user of the TransAeris
stimulator can help prevent electromagnetic interference by maintaining a minimum
distance between portable and mobile RF communications equipment (transmitters)
and the TransAeris stimulator as recommended below, according to the maximum
output power of the communications equipment.
Rated
maximum
output power
of transmitter
W
0.01
0.1
1
10
100
For transmitters rated at a maximum output power not listed above, the recommended separation
distance d in metres (m) can be determined using the equation applicable to the frequency of the
transmitter, where P is the maximum output power rating of the transmitter in watts (W) according
to the transmitter manufacturer.
NOTE 1 At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
NOTE 2 The ISM (industrial, scientific and medical) bands between 150 kHz and 80 MHz are 6,765 MHz
to 6,795 MHz; 13,553 MHz to 13,567 MHz; 26,957 MHz to 27,283 MHz; and 40,66 MHz to 40,70 MHz.
NOTE 3 An additional factor of 10/3 has been incorporated into the formulae used in calculating the
recommended separation distance for transmitters in the ISM frequency bands between 150 kHz and
80 MHz and in the frequency range 80 MHz to 2,5 GHz to decrease the likelihood that mobile/portable
communications equipment could cause interference if it is inadvertently brought into patient areas.
NOTE 4 These guidelines may not apply in all situations. Electromagnetic propagation is affected by
absorption and reflection from structures, objects and people.
84 42
Separation distance according to frequency of transmitter m
150 kHz to 80 150 kHz to 80
MHz outside MHz in ISM
ISM bands bands
d = 1.2√P d = 1.2√P
0.12 0.12
0.38 0.38
1.2 1.2
3.8 3.8
12 12
80 MHz to 800 800 MHz to 2,5
MHz GHz
d = 1.2√P d = 2.3√P
0.12 0.23
0.38 0.73
1.2 2.3
3.8 7.3
12 23