54
55
Electromagnetic immunity – cont.
The CLEAR™ series hearing aids are intended for use in the elec-
tromagnetic environment specified below. The customer or the
user of a CLEAR™ 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
CLEAR
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: