EDAN SONOTRAX Basic User Manual - page 44
SONOTRAX Series Ultrasonic Pocket Doppler User Manual EMC Information
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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 SONOTRAX Series Ultrasonic Pocket Doppler is used exceeds the
applicable RF compliance level above, the SONOTRAX Series Ultrasonic Pocket Doppler should be
observed to verify normal operation. If abnormal performance is observed, additional measures may
be necessary, such as reorienting or relocating the SONOTRAX Series Ultrasonic Pocket Doppler.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
A2.4 Recommended Separation Distances
Recommended separation distances between portable and mobile RF communications equipment
and the SONOTRAX Series Ultrasonic Pocket Doppler
The SONOTRAX Series Ultrasonic Pocket Doppler is intended for use in an electromagnetic 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 distance between portable and mobile RF
communications equipment (transmitters) and the SONOTRAX Series Ultrasonic Pocket Doppler 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)
80 MHz to 800 MHz
P
E
d
⎥
⎦
⎤
⎢
⎣
⎡
=
1
5
.
3
800 MHz to 2.5 GHz
P
E
d
⎥
⎦
⎤
⎢
⎣
⎡
=
1
7
0.01 0.1167
0.2334
0.1 0.3689
0.7378
1 1.1667
2.3334
10 3.6893
7.3786
100 11.6667
23.3334
For transmitters rated at a maximum output power not listed above, the recommended separation distances
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.