6 Specifications and Theory of Operation
1009-0633-000
6-11
Immunity test
IEC 60601-1-2
Test Level
Compliance
level
Electromagnetic environment
guidance
Portable and mobile RF communications equipment should be
used no closer to any part of the system, including cables, than the
recommended separation distance calculated from the equation
appropriate for the frequency of the transmitter.
Recommended separation distance
Conducted RF
IEC 61000-4-6
3 Vrms
150 kHz to 80 MHz
outside ISM bands
3 Vrms (V1)
D=3.5√P
10 Vrms
150 kHz to 80 MHz
in ISM bands
10 Vrms (V2)
D=12√P
Radiated RF
IEC 61000-4-6
10 V/m
10 V/m (E1)
D=1.2√P 80 mHz to 800 mHz
80 MHz to 2,5 GHz
D=3.5√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 meters (m).
Field strengths from fixed RF transmitters, as determined by an
electromagnetic site survey, should be less than the compliance
level in each frequency range.
The ISM (industrial, scientific and medical) bands between 150 kHz and 80 MHz are 6,765 MHz to 6,795 MHz;
13,553 MHz to 13,567 MHz; 26,957 MHz to 27,283 MHz; and 40,66 MHz to 40,70 MHz.
The compliance levels in the ISM frequency bands between 150 kHz and 80 MHz and in the frequency range 80 MHz to 2,5 GHz
are intended to decrease the likelihood that a portable communications device could cause interference if it is inadvertently
brought into patient areas. For this reason, an additional factor of 10/3 is used in calculating the recommended separation
distance for transmitters in these frequency ranges.
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 system is used exceeds the applicable RF compliance level above, the system should be
observed to verify normal operation. If abnormal performance is observed, additional measures may be necessary, such as re-
orienting or relocating the system.
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 1 V/m.
Note: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from
structures, objects, and people.
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