DIAMAG
Operating Manual
Page 24
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 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 reorienting or relocating the device.
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 and the device
The device is intended for use in an environment in which radiated RF
disturbances are controlled. The customer or the user of the device can
help prevent electromagnetic interference by maintaining a minimum dis-
tance between portable and mobile RF communications equipment
(transmitters) and the 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
0,38
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 determined us-
ing 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:
• At 80 MHz and 800 MHz, the separation distance for the higher frequen-
cy range applies.
• These guidelines may not apply in all situations. Electromagnetic propagation
is affected by absorption and reflection from structures, objects and people.
