Citizen CH-453 Instruction Manual page 30

Guidance and manufacturer's declaration - electromagnetic immunity
The [CH-453-AC] is intended for use in the electromagnetic environment specified below. The customer or
the user of the [CH-453-AC] should assure that it is used in such an environment.
3 Vrms, 6 Vrms*
Conducted
150 kHz
RF
to
IEC
80 MHz
61000-4-6
Radiated 10 V/m
RF 80 MHz
IEC to
61000-4-3 2.7 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 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 [CH-453-AC] is used exceeds the applicable RF compliance level above, the
[CH-453-AC] should be observed to verify normal operation. If abnormal performance is observed,
additional measures may be necessary, such as reorienting or relocating the [CH-453-AC].
b). Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Recommended separation distances between portable and mobile RF communications
equipment and the [CH-453-AC]
The [CH-453-AC] is intended for use in an electromagnetic environment in which radiated RF
disturbances are controlled. The customer or the user of the [CH-453-AC] can help prevent
electromagnetic interference by maintaining a minimum distance between portable and mobile
RF communications equipment (transmitters) and [CH-453-AC] as recommended below,
according to the maximum output power of the communications equipment.
Rated maximum
output power of
150 kHz to 80 MHz
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 meters (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.
Portable and mobile RF communications equipment should be used no closer to
any part of the [CH-453-AC], including cables, than the recommended separation
distance calculated from the equation applicable to the frequency of the transmitter.
Recommended separation distance
3 Vrms, d = 1.2 3 Vrms
6 Vrms* d = 2 6 Vrms*
* (in ISM and amateur radio bands)
10 V/m d = 1.2 80 MHz to 800 MHz
d = 2.3 800 MHz to 2.7 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 meters (m).
Field strengths from fixed 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 (m)
150 kHz to 80 MHz
3 Vrms
d = 1.2 d = 2
0.12
0.38
1.2
3.8
12
Eng 30
-
80 MHz to 800 MHz
6 Vrms d = 1.2
0.2 0.12
0.63 0.38
2
6.3
20
-
should be less than the
a)
b)
800 MHz to 2.7 GHz
d = 2.3
0.23
0.73
1.2 2.3
3.8 7.3
12 23