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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 device is used exceeds the applicable RF compliance
level above, the device should be observed to verify normal operation. If abnormal performance
is observed, additional measures may be necessary, such as re-orienting or relocating the device.
Over frequency range 150kHz to 80MHz. For Resp field strength should be less than 1V/m.
b
Recommended separation distances between portable and mobile RF communications
equipment and the device
The Health Monitor is intended for use in an electromagnetic environment in which radiated RF
disturbances are controlled. The customer or the user of the Health Monitor can help prevent
electromagnetic interference by maintaining a minimum distance between portable and mobile
RF communications equipment (transmitters) and the monitor as recommended below, according
to the maximum output power of the communications equipment.
Rated max.
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 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 from structures, objects and people.
Separation distance according to frequency of the transmitter (m)
150 kHz - 80 MHz
=
d 1 2 . P
0.12
0.38
1.20
3.80
12.00
80 MHz - 800 MHz
=
d 1 2 . P
0.12
0.38
1.20
3.80
12.00
16
800 MHz - 2.5 GHz
=
d 2 3 . P
0.23
0.73
2.30
7.30
23.00