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Opera Care
Solo Bed Installation Guide and Technical Specification | Version 1
8.9
Working Clearances
Recommended working clearances between portable and mobile RF
communications equipment and the care bed
The care bed is intended for use in the electromagnetic environment in which
radiated RF disturbances are controlled. The customer or user of the care bed can
help to prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF communications equipment (transmitters) and the
care bed as recommended below, according to the maximum output power of the
communication device.
Output Power
of Transmitter
in Watts (W)
Working clearance according to transmission frequency (In meters
- M)
150 kHz to 80
MHz at 3 V/m
80 MHz to
800 MHz at
3 V/m
800 MHz to 2.5 GHz at 3 V/m
0.01
0.12
0.12
0.23
0.1
0.38
0.38
0.73
1
1.2
1.2
2.3
10
3.8
3.8
7.3
100
12
12
23
For transmitters not rated in the list above, the working clearance can be determined
using the equation, which belongs to the transmitter, where P is the nominal output
of the transmitter in Watts (W) according to specifications of the transmitter
manufacturer.
Note 1: An additional factor of 10/3 is applied when calculating the recommended
working clearance between transmitters in the 80 MHz to 2.5 GHz frequency range
in order to reduce the probability that a mobile/portable communications device
unintentionaly brought into the patient area could lead to interference.
Note 2: These guidelines may not apply in all situations. Propagation of
electromagnetic waves is affected by absorption and reflection from structures,
objects and persons.
then the care bed should be monitored with respect to its normal operation. If abnormal
performance is observed, it may be necessary to take additional measures, such as
reorienting or relocating the care bed.
b) Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3
V/m.
8.
Technical Specifications
