45
Electromagnetic immunity – cont.
The Melodia™ series hearing aids are intended for use in the elec-
tromagnetic environment specified below. The customer or the
user of a Melodia™ series hearing aid should assure that it is used
in such an environment.
Immunity
Test
IEC 60601
Test level
Compli-
ance level
Electromagnetic environ-
ment – guidance
Portable and mobile RF
communications equip-
ment should be used no
closer to any part of the
Melodia
TM
series hearing
aid, including cables, than
the recommended separa-
tion distance calculated
from the equation applica-
ble to the frequency of the
transmitter.
Conducted
RF
IEC
61000-4-6
3 Vrms
150 kHz to
80 MHz
3 Vrms
Recommended separation
distance
d = 1.2
√
P
Radiated
RF
IEC
61000-4-3
3 V/m
80 MHz to
2.5 GHz
3 V/m
d = 1.2
√
P
80 MHz to 800 MHz
d = 2.3
√
P
800 MHz to 2.5 GHz
Immunity
Test
IEC 60601
Test level
Compli-
ance level
Electromagnetic environ-
ment – guidance
Where
P
is the maximum
output power rating of the
transmitter in watts (W)
according to the transmit-
ter manufacturer and
d
is
the recommended separa-
tion distance in meters
(m).
Field strengths from fixed
RF transmitters, as deter-
mined by an electromag-
netic site survey
a
, should
be less than the compliance
level in each frequency
range
b
.
Interference may occur in
the vicinity of equipment
marked with the following
symbol:
NOTE 1 At 80 MHz and 800 MHz, the higher frequency range
applies.
NOTE 2 These guidelines may not apply in all situations. Elec-
tromagnetic propagation is affected by absorption and reflection
from structures, objects and people.
