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Radiated RF IEC
3 V/m
61000-4-3
80 MHz to
2.5 GHz
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 Harmony system
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 Harmony
system is used exceeds the applicable RF
compliance level above, the Harmony systems
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.
3 V/m
Portable and mobile RF communications
equipment should be used no closer to any
part of the Harmony system, including cables,
than the recommended separation distance
calculated from the equation applicable to the
frequency of the transmitter.
Recommended separation distance
d = 1.2√P < 800 MHz
d = 2.3√P ≥ 800 MHz
where P is the maximum output power rating
of the transmitter in watts (W) according to
the transmitter manufacturer and d is the
recommended separation distance in metres
(m). Field strengths from fixed RF transmitters, as
determined by an electromagnetic site survey,
should be less than the compliance level in each
frequency range.
Interference may occur in the vicinity of
equipment marked with the following symbol:
c
b
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