- Eng 25 -
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Guidance and manufacturer’s declaration - electromagnetic immunity
The [CHU305] is intended for use in the electromagnetic environment speci
fi
ed below.
The customer or the user of the [CHU305] should assure that it is used in such an environment.
Portable and mobile RF communications equipment should be used no closer to
any part of the [CHU305], including cables, than the recommended separation
distance calculated from the equation applicable to the frequency of the transmitter.
Conducted
RF
IEC 61000-
4-6
3 Vrms
150 kHz
to
80 MHz
N/A
Recommended separation distance
N/A
Radiated
RF
IEC 61000-
4-3
3 V/m
80 MHz
to
2.5 GHz
3 V/m
d
= 1.2 80 MHz to 800 MHz
d
= 2.3 800 MHz to 2.5 GHz
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
fi
xed RF transmitters, as determined
by an electromagnetic 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. Electromagnetic propagation is
affected by absorption and re
fl
ection from structures, objects and people.
a). Field strengths from
fi
xed 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
fi
xed RF transmitters, an electromagnetic site survey should be considered. If the measured
fi
eld
strength in the location in which the [CHU305] is used exceeds the applicable RF compliance level
above, the [CHU305] should be observed to verify normal operation. If abnormal performance is
observed, additional measures may be necessary, such as reorienting or relocating the [CHU305].
b). Over the frequency range 150 kHz to 80 MHz,
fi
eld strengths should be less than 3 V/m.
Recommended separation distances between portable and mobile RF communications
equipment and the [CHU305]
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 (transmitters) and the deivce
as recommended below, according to the maximum output power of the communications equipment.
Rated maximum
output power of
transmitter
W
Separation distance according to frequency of transmitter
m
150 kHz to 80 MHz
N/A
80 MHz to 800 MHz
d
= 1.2
800 MHz to 2.5 GHz
d
= 2.3
0.01
N/A
0.12
0.23
0.1
N/A
0.38
0.73
1
N/A
1.2
2.3
10
N/A
3.8
7.3
100
N/A
12
23
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 re
fl
ection from structures, objects and people.
00̲CHU305̲USA.indb Eng-25
00̲CHU305̲USA.indb Eng-25
2015/01/13 19:53:23
2015/01/13 19:53:23
