Wireless Access Point
590
Table6fornon‐lifesupportingequipment
NOTE 1 At 80 MHz and 800 MHz, 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
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 Xirrus wireless devices are used exceeds the applicable RF
compliance level above, the Xirrus wireless device should be observed to verify normal operation. If
abnormal performance is observed, additional measures maybe necessary, such as re-orienting or
relocating the Xirrus wireless device.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Recommended separation distances between Medical Electrical
Equipment and Xirrus Wireless Devices
Xirrus wireless devices are intended for use in an electromagnetic environment in which radiated
RF disturbances are controlled. The customer or the user of the Xirrus wireless device can help
prevent electromagnetic interference by maintaining a minimum distance between portable and
mobile RF communication equipment (transmitters) and the Xirrus wireless device as
recommended below, according to the maximum output power of the communications
equipment.
Rated maximum output
power of transmitter
W
Separation distance according to frequency of transmitter
m
150 kHz to 80 MHz
d = 1.17* √P
80 MHz to 800 MHz
d = 1.17* √P
800 MHz to 2.5 GHz
d = 2.33* √P
0.01 0.12 0.12 0.23
0.1 0.37 0.37 0.74
1 1.17 1.17 2.33
10 3.7 3.7 7.37
100 11.7 11.7 23.3
For transmitters rated 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.
NOTE 1 At 80 MHz and 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 for structures, objects and people.
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