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D00073611 Siemens SD 270 Service Manual
Recommended separation distances between portable and mobile RF
communications equipment and the SD 270 Audiometer
The SD 270 Audiometer is intended for use in an electromagnetic environment
in which radiated RF disturbances are controlled. The customer or the user of
the SD 270 Audiometer can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF
communications equipment (transmitters) and the SD 270 Audiometer 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 = 1.2 P
80 MHz to 800
MHz
d = 1.2 P
800 MHz to 2.5
GHz
d = 2.3 P
0.01
0.12
0.12
0.23
0.1
0.38
0.38
0.73
1
1.2
1.2
2.3
10
3.8
3.8
7.3
100
12
12
23
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 80MHz and 800MHz, 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.