C-4
Radiated RF
IEC61000-4-3
10V/m
80MHz～
2.5GHz
10 V/m
（E1）
P
E
d
⎥
⎦
⎤
⎢
⎣
⎡
=
1
12
80 MHz～800 MHz
P
E
d
⎥
⎦
⎤
⎢
⎣
⎡
=
1
23
800 MHz～2.5 GHz
Where,
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
c
,
should be less than the compliance level in each
frequency range
d
.
Interference may occur in the vicinity of
equipment marked with the following
symbol:
.
Note 1: At 80 MHz to 800 MHz, the separation distance for the higher frequency range applies.
Note 2: These guidelines may not apply in all situations. Electromagnetic propagation is affected by
absorption and reflection from structures, objects and people.
a. 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.
b. An additional factor of 10/3 is used in calculating the recommended separation distance for
transmitters in the ISM frequency bands between 150 kHz and 80 MHz and in the frequency range
80 MHz to 2.5 GHz to decrease the likelihood that mobile/portable communications equipment
could cause interference if it is inadvertently brought into patient areas.
c. 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 anesthesia machine is used exceeds the applicable RF
compliance level above, the anesthesia machine should be observed to verify normal operation. If
abnormal performance is observed, additional measures may be necessary, such as reorienting or
relocating the anesthesia machine.
d. Field strengths should be less than or equal to 3 Vrms outside the ISM bands between 150 kHz
and 80 MHz, and less than or equal to 10 Vrms within the ISM bands.
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