- 32 -
DM-4000 is intended for use in the electromagnetic environment specified below. The customer or the user of DM-4000 should assure that it is
used in such an environment.
NOTE1 At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures,
objects and people.
a
Field strength from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios, amateur radio, AM
and FM radios 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 DM-4000 is
used exceeds the applicable RF compliance level above, DM-4000 should be observed to verify normal operation. If abnormal performance is
observed, additional measures may be necessary, such as reorienting or relocating DM-4000.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Immunity test
Conducted RF
IEC 61000-4-6
Radiated RF
IEC 61000-4-3
IEC 60601 test level
3 Vrms
150 kHz to 80 MHz
3 V/m
80 MHz to 2.5 GHz
Compliance level
3 V/m
3 V/m
Electromagnetic environment - guidance
Portable and mobile RF communications equipment should be used no closer to
any part of DM-4000, including cables, than the recommended separation distance
calculated from the equation applicable to the frequency of the transmitter.
Recommended separation distance
d=[3.5/V1]
√
P
d=[3.5/E1]
√
P
80 MHz to 800 MHz
d=[7/E1]
√
P
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 fixed 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:
Table 4 - Guidance and manufacturer’s declaration - electromagnetic immunity -
DM-4000 is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or the user of
DM-4000 can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications
equipment (transmitters) and DM-4000 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.
NOTE1 At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
NOTE2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures,
objects and people.
Rated maximum output power
of transmitter, W
0.01
0.1
1
10
100
Separation distance according to frequency of transmitter, m
150 kHz to 80 MHz, d=[3.5/V1]
√
P
0.12
0.38
1.2
3.8
12
80 MHz to 800 MHz, d=[3.5/E1]
√
P
0.12
0.38
1.2
3.8
12
800 MHz to 2.5 GHz, d=[7/E1]
√
P
0.23
0.73
2.3
7.3
23
Table 6 - Recommended separation distances between portable and mobile RF communications equipment and DM-4000 -
Technical description