Portable and mobile RF communications equipment
should be used no closer to any part of the medical
bed including cables, than the recommended separation
distance calculated from the equation applicable to the
frequency of the transmitter.
Recommended separation distance:
Conducted RF
IEC 61000-4-6
3 V
3 V
Radiated RF
IEC 61000-4-3
3 V/m
3 V/m
80 MHz to 800 MHz
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 metres (m).
b
Field strengths from fixed RF transmitters, as determined
by an electromagnetic site survey,
a
should be less than the
compliance level in each frequency range.
b
Interference may occur in the vicinity of equipment
marked with the following symbol:
a
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 medical bed is used
exceeds the applicable RF compliance level above, the medical bed should be observed to verify normal operation. If abnormal performance is
observed, additional measures may be necessary, such as reorienting or relocating the medical bed.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than [V1] V/m.
At 80 MHz and 800 MHz, the higher frequency range applies.
Recommended separation distances between portable and mobile RF communications equipment and the medical
bed
The medical bed is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or
the user of the medical bed can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile
RF communications equipment (transmitters) and the medical bed as recommended below, according to the maximum output power of
the communications equipment
Separation distance according to frequency of transmitter
[m]
Rated maximum output of
transmitter
[W]
150 kHz to 80 MHz
80 MHz to 800 MHz
800 MHz to 2,5 GHz
0.01
0.12
0.12
0.23
0.1
0.37
0.37
0.74
1
1.17
1.17
2.33
10
3.69
3.69
7.38
100
11.67
11.67
23.33
For transmitters rated at a maximum output power not listed above the recommended separation, distance d in metres (m) can be estimated
using the equation applicable to the frequency of the transmitter, where P is the maximum output power rating of the transmitter in watts (W)
according to the transmitter manufacturer.
At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures,
objects and people.
1567454-A
17
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