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9000-606-89/30 1711V001
Appendix
Electromagnetic interference immunity for devices or systems that are not life-sustaining
Portable and mobile communication devices should not be used any closer to the unit (including ca-
bles) than the recommended safety distance, which is calculated based on the applicable formula for
the transmission frequency�
Interference im-
munity tests
IEC 60601 - test
level
Compliance
level
Recommended safety distance
Conducted HF
disturbance varia-
bles in accord-
ance with
IEC 61000-4-6
3 V
eff
150 kHz to
80 MHz
[V
1
] = 10 V
d = 0�35
⋅ √
P
Emitted HF distur-
bance variables in
accordance with
IEC 61000-4-3
10 V/m 80 MHz
up to 2�7 GHz
[E
1
] = 10 V/m
d = 0�35
⋅ √
P for 80 MHz to 1000 MHz
d = 0�7
⋅ √
P for 1000 MHz to 2�7 GHz
Table 2: Electromagnetic interference immunity for units or systems operated in healthcare facili-
ties
P
Rated power of the transmitter in Watts (W) in accordance with the specifications of the
transmitter manufacturer
d
Recommended safety distance in metres (m)
The field strength of stationary communication devices should be lower than the compli-
ance level for all frequencies based on inspections on site
a
�
b
Interference is possible in the environment of units that have the following symbols�
Comment 1
The higher frequency range applies for 80 MHz and 800 MHz�
Comment 2
These guidelines may not apply in all cases� The propagation of electromagnetic
radiation is affected by absorption and reflection on the building, objects and
people�
a
The field strength of stationary transmitters, such as the base stations of mobile phones and land
mobile radios, amateur radio stations, AM and FM radio and television broadcasters, for example,
cannot be accurately predicted� In order to determine the electromagnetic environment with regard to
stationary transmitters, a study of electromagnetic phenomena at the site should be considered� If the
measured field strength at the location where the unit is used exceeds the compliance levels stated
above, the unit should be monitored to verify that it works as intended� If unusual performance char-
acteristics are observed additional measures may be required, such as a changing the orientation of
the unit or moving it to a different location�
b
Over the frequency range of 150 kHz to 80 MHz, the field strength should be less than [V
1
] V/m�
EN
