REV: 2019-04
41
Recommended separation distances between
portable and mobile RF communications equipment and the Life-Stat
The Life-Stat is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or
the user of the Life-Stat can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile
RF communications equipment (transmitters) and the Life-Stat as recommended below, according to the maximum output power of the
communications equipment.
Separation distance according to frequency of transmitter
m
Rated maximum output
power of transmitter
W
150 kHz to 80 MHz
outside ISM bands
Not Applicable
150 kHz to 80 MHz
in ISM bands
Not Applicable
80 MHz to 800 MHz
d =
1.2
800 MHz to 2.5 GHz
d =
2.3
0.01
Not Applicable
Not Applicable
0.12
0.23
0.1
Not Applicable
Not Applicable
0.38
0.73
1
Not Applicable
Not Applicable
1.2
2.3
10
Not Applicable
Not Applicable
3.8
7.27
100
Not Applicable
Not Applicable
12
23
For transmitters rated at a maximum output power not listed above, the recommended separation distance
d
in meters (m) can be determined 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 The ISM (industrial, scientific, and medical) bands between 150 kHz and 80 MHz are 6.765 MHz to 6.795 MHz; 13.553 MHz to 13.567 MHz;
26.957 MHz to 27.283 MHz; and 40.66 MHz to 40.70 MHz.
NOTE 3 An additional factor of 10/3 has been incorporated into the formulae used in calculating the recommended separation distance for transmitters
in the ISM frequency bands between 150 kHz and 80 MHz and in the frequency range 80 MHz to 2.5 GHz to decrease the likelihood that mobile/portable
communications equipment could cause interference if it is inadvertently brought into patient areas.
NOTE 4 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects,
and people.
