Naída CI Sound Processor User Guide
59
Recommended separation distances between portable and mobile
RF communications equipment and the Naída CI
The Naída CI is intended for use in an electromagnetic environment in which radiated RF disturbances
are controlled. The customer or the user of the Naída CI can help prevent electromagnetic interference
by maintaining a minimum distance between portable and mobile RF communications equipment
(transmitters) and the Naída CI as recommended below, according to the maximum output power of
the communications equipment.
0.01
d
= 1.2
√
P <
800 MHz
Rated Maximum Output
Power of Transmitter
(w)
Separation distance according to frequency of transmitter
(m)
d
= 1.2
√
P <
800 MHz
0.12
0.23
0.1
0.38
0.73
1
1.2
2.3
10
3.8
7.3
100
12
23
For transmitters rated at a maximum output power not listed above, the recommended separation
distance d in meters (m) can be estimated 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:
These guidelines may not apply in all situations. Electromagnetic propagation
is affected by absorption and reflection from structures, objects and people.
a
Essential performance of the Naída CI per IEC 60601 requirements is defined as auditory
stimulation within safe amplitudes.
b
Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and
land mobile radios, amateur radio, AM and FM radio broadcast and TV broadcast cannot be predicted
theoretically with accuracy. To assess the electromagnetic environment due to fixed RF transmitters, an
electromagnetic site survey should be considered. If the measured field strength in the location in which
the Naída CI is used exceeds the applicable RF compliance level above, the Naída CI should be observed
to verify normal operation.
c
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Separation Distances between RF Communications equipment and Naída CI
NOTe:
These guidelines may not apply in all situations. Electromagnetic propagation
is affected by absorption and reflection from structures, objects and people.
