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Note 1: 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 Sky 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 Sky CI is used exceeds the applicable RF compliance level above, the Sky 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 Sky CI M90
Recommended Separation Distances between Portable and Mobile RF Communications Equipment and
the Sky CI M90
The Sky CI is intended for use in an electromagnetic environment in which radiated RF disturbances are
controlled. The customer or the user of the Sky CI can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment
(transmitters) and the Sky CI 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 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 1: These guidelines may not apply in all situations. Electromagnetic propagation is affected by
absorption and reflection from structures, objects and people.
Separation distance according to frequency of transmitter (m)
d = 1.2√P < 800 MHz
0.12
0.38
1.2
3.8
12
symbol:
d = 2.3√P ≥ 800 MHz
0.23
0.73
2.3
7.3
23
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