Arjohuntleigh citadel Instructions For Use Manual page 40

Guidance and manufacturer's declaration – electromagnetic immunity
Field strengths from fixed transmitters, such as base stations for radio (cellular / cordless)
a
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 Citadel Mattress Control
Unit is used exceeds the applicable RF compliance level above, the Citadel Mattress Control
Unit should be observed to verify normal operation. If abnormal performance is observed
additional measures may be necessary, such as reorienting or relocating the Citadel Mattress
Control Unit.
Over the frequency range 150kHz to 80MHz, field strengths should be less than 3V/m.
b
Recommended separation distances between portable and mobile RF communications
equipment and the Citadel Mattress Control Unit
The Citadel Mattress Control Unit is intended for use in an electromagnetic environment
in which radiated RF disturbances are controlled. The customer or the user of the Citadel
Mattress Control Unit can help prevent electromagnetic interference by maintaining a
minimum distance between portable and mobile RF communications equipment (transmitters)
and the Citadel Mattress Control Unit as recommended below, according to the maximum
output power of the communications equipment.
Rated maximum output
power of transmitter
W
0.01
.1
1
10
100
For transmitters rated at a maximum output power not listed above, the recommended
separation distance d in meters (m) can be estimated using the equation applicable to the
power of the transmitter, where
watts (W) according to the transmitter manufacturer.
At 80MHz and 800MHz, 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.
40
Separation distance according to frequency of transmitter
150kHz to 80MHz
d = 1.2 P
.12
.38
1.2
3.8
12
P is the maximum output power rating of the transmitter in
m
80MHz to 800MHz
d = 1.2 P
.12
38
1.2
3.8
12
Citadel Patient Therapy System
800MHz to 2.5GHz
d = 2.3 P
.23
.73
2.3
7.3
23