3B Medical Cirrus 5 User Manual page 20

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 the
Cirrus 5 is used exceeds the applicable RF compliance level above, the Cirrus 5 should be observed to verify
normal operation. If abnormal performance is observed, additional measures may be necessary, such as
re-orienting or relocating the Cirrus 5.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Recommended separation distances between portable and mobile RF communications equipment
The Cirrus 5 is intended for use in an electromagnetic environment in which radiated RF disturbances are
controlled. The customer or the user of the Cirrus 5 can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment (transmitters)
and the Cirrus 5 as recommended below, according to the maximum output power of the communications
equipment.
Rated maximum
output power
of transmitter
W
0.01
0.1
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 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 from structures, objects and people.
Cirrus 5 User Manual
and the Cirrus 5
Separation distance according to frequency of transmitter
150 kHz to 80 MHz

d . 1 17 P
0.12
0.37
1.17
3.69
11.67
determined by an electromagnetic site survey,
should be less than the compliance level in each
frequency range.
Interference may occur in the vicinity of
equipment marked with the following symbol:
m
80 MHz to 800 MHz

d . 1 17 P
0.12
0.37
1.17
3.69
11.67
20
b
800 MHz to 2,5 GHz

d . 1 17 P
0.07
0.22
0.70
2.21
7.00
a