150 kHz to
80 MHz
d = 3.5
80 MHz to
800 MHz
d = 1.2
800 MHz to
2.7 GHz
d = 2.3
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
0.38
1.2
3.8
12
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.
40
41
EMC 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.
b Over the frequency range 150 kHz to 80 MHz, field strengths
should be less than 3V/m.
Table 3
EMC GUIDANCE
