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33
Appendix
Electromagnetic interference immunity factor for appliances or systems that are operated in
healthcare facilities
Mobile radios should not be used closer to the unit (including the lines) than the recommended safety
distance that is calculated according to the formula that applies to the transmission frequency
Interference
immunity tests
IEC 60601 – test
level
Compliance
level
Recommended safety distance
Conducted HF
disturbance vari-
ables in accor-
dance with
IEC 61000-4-6
3 V
eff
150 kHz to
80 MHz
[V
1
] V
d = [35 / V
1
]
⋅ √
P
d = 12
⋅ √
P
Emitted HF distur-
bance variables in
accordance with
IEC 61000-4-3
10 V/m 80 MHz
to 27 GHz
[E
1
] V/m
d = [35 / E
1
]
⋅ √
P for 80 MHz to 800
MHz
d = 12
⋅ √
P for 80 MHz to 800 MHz
d = [7 / E
1
]
⋅ √
P for 800 MHz to 27
GHz
d = 23
⋅ √
P for 800 MHz to 27 GHz
Table 3: Electromagnetic interference immunity factor for appliances or systems that are operated
in healthcare facilities
P
Rated power of the transmitter in Watts (W) in accordance with the specifications of the
transmitter manufacturer
d
Recommended safety distance in meters (m)
The field strength of stationary radio transmitters for all frequencies should be lower than
the compliance level
b
in accordance with inspections on-site
a
Interferences are possible in the vicinity of appliances that have the following symbols
Note 1:
The higher frequency range applies for 80 MHz and 800 MHz
Note 2:
These guidelines may not apply in all cases The spreading of electromagnetic
field sizes is influenced by absorptions and reflections of the building, objects
and people
a
The field strength of stationary transmitters, such as the base stations of mobile phones and mobile
landline wireless devices, amateur radio stations, AM and FM radio and television broadcasters, can-
not be predicted theoretically with accuracy To determine the electromagnetic environment with re-
gard to stationary transmitters, a study of the electromagnetic phenomena of the location should be
considered If the measured field strength at the location where the unit is used exceeds the compli-
ance level mentioned above, the unit should be observed to verify the intended function If unusual
performance characteristics are observed, additional measures may be required, such as a changed
alignment or relocation of the unit
b
Over the frequency range of 150 kHz to 80 MHz, the field strength should be less than [V
1
] V/m
EN
US
