Citizen CHU304 Instruction Manual page 19

Guidance and manufacturer's declaration - electromagnetic immunity
The [CHU304/CH305] is intended for use in the electromagnetic environment speciÞ ed below. The
customer or the user of the [CHU304/CH305] should assure that it is used in such an environment.
Conducted 3 Vrms
RF 150 kHz
IEC 61000- to
4-6 80 MHz
Radiated 3 V/m
RF 80 MHz
IEC 61000- to
4-3 2.5 GHz
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 reß ection from structures, objects and people.
a). Field strengths from Þ 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 Þ xed RF transmitters, an electromagnetic site survey should be considered. If the measured
Þ eld strength in the location in which the [CHU304/CH305] is used exceeds the applicable RF
compliance level above, the [CHU304/CH305] should be observed to verify normal operation. If
abnormal performance is observed, additional measures may be necessary, such as reorienting
or relocating the [CHU304/CH305].
b). Over the frequency range 150 kHz to 80 MHz, Þ eld strengths should be less than 3 V/m.
Recommended separation distances between portable and mobile RF communications
equipment and the [CHU304/CH305]
The [CHU304/CH305] is intended for use in an electromagnetic environment in which radiated RF disturbances
are controlled. The customer or the user of the [CHU304/CH305] 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
0.01
0.1
1
10
100
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 reß ection from structures, objects and people.
Portable and mobile RF communications equipment should be used no closer to any
part of the [CHU304/CH305], including cables, than the recommended separation
distance calculated from the equation applicable to the frequency of the transmitter.
Recommended separation distance
N/A N/A
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 Þ xed RF transmitters, as determined
by an electromagnetic site survey,
compliance level in each frequency range.
Interference may occur in the vicinity of
equipment marked with the following symbol:
Separation distance according to frequency of transmitter
150 kHz to 80 MHz
N/A
N/A
N/A
N/A
N/A
N/A
- Eng 18 -
should be less than the
a)
m
80 MHz to 800 MHz
d = 1.2
0.12
0.38
1.2
3.8
12
b)
800 MHz to 2.5 GHz
d = 2.3
0.23
0.73
2.3
7.3
23