32
33
EMC GUIDANCE
Table 3
Guidance and manufacturer’s declaration – electromagnetic immunity
Immunity test
Compliance
level
IEC 60601
Test level
Conducted RF
IEC 61000-4-6
Radiated RF
IEC 61000-4-3
10V/m, 80% Am
at 1kHz
150 kHz to
80 MHz:
3 Vrms
6Vrms (in ISM
and amateur
radio bands)
80% Am at 1kHz
Electromagnetic environment - guidance
NOTE 1
At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE 2
These guidelines may not apply in all situations. Electromagnetic propagation is affected by
absorption and reflection from structures, objects and people.
a
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 device is used exceeds the applicable RF compliance level
above, the device should be observed to verify normal operation. If abnormal performance is
observed, additional measures may be necessary, such as re-orienting or relocating the device.
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3V/m.
b
The device is intended for use in the electromagnetic environment specified below. The customer or the
user of the device should assure that it is used in such an environment.
150 kHz to
80 MHz:
3 Vrms
6Vrms (in ISM
and amateur
radio bands)
80% Am at 1kHz
Portable and mobile RF communications
equipment should be used no closer to any part
of the device, including cables, than the
recommended separation distance calculated
from the equation appropriate for the frequency
of the transmitter.
Recommended separation distances:
d=0.35 ;
d=1.2
10V/m, 80% Am
at 1kHz
80 MHz to 800 MHz:
d=1.2
800 MHz to 2.7 GHz:
d=2.3
where,
P
is the maximum
output power rating of the
transmitter in watts (W)
according to the
transmitter manufacturer,
d
is the recommended
separation distance in
meters (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:
P
P
P
P
a
b
150 kHz to 80 MHz
80 MHz to 800 MHz
800 MHz to 2.7 GHz
Table 4
Recommended separation distances between portable and mobile RF communications
equipment and the device.
Rated maximum output
power of transmitter
(W)
Separation distance according to frequency of transmitter
(m)
0.01
0.1
1
10
100
0.12
0.12
0.38
1.2
3.8
12
0.23
0.73
2.3
7.3
23
=
d
=
d
1.2
2.3
=
d
0.38
1.2
3.8
12
3.5
The device is intended for use in an electromagnetic environment in which radiated RF disturbances are
controlled. The customer or the user of the device can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment
(transmittters) and the device as recommended below, according to the maximum output power of the
communications equipment.
For transmitters rated at a maximum output power not listed above, the recommended separation
distance
d
in metres (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 At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by
absorption and reflection from structures, objects and people.
P
P
P
EMC GUIDANCE
