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Radiated immunity
Immunity test
IEC 60601-1-2 test level Compliance level
Conducted RF IEC
3 Vrms
61000-4-6
150 kHz to 80 MHz
outside ISM bands
10 Vrms
150 kHz to 80 MHz in
ISM bands
Radiated RF IEC
10 V/m
61000-4-3
80 MHz to 2.5 GHz
•
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 mobile/portable communications equipment
could cause interference if it is inadvertently brought into patient areas. For this reason, an additional factor of
10/3 has been incorporated into 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 not be necessary, such as re-orienting or
relocating the system.
•
Over the frequency range of 150 kHz to 80 MHz, field strengths should be less than 10 V/m.
Note: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and
reflection from structures, objects, and people.
2067226-001
11 Specifications and theory of operation
10 Vrms (V1)
10 Vrms (V2)
10 V/m (E1)
Electromagnetic environment
guidance recommended
separation distance
D=0.35√P
D=1.2√P
D=1.2√P 80 MHz to 800 MHz
D=2.3√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.
Interference may occur in the vicinity
of equipment marked with the
following symbol:
11-49
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