Safety
84 EchoNous Bladder & Vein User Guide
4
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 system is used exceeds the applicable RF compliance level above, the
system should be observed to verify normal operation. If abnormal performance is observed, additional measures may be
necessary, such as re-orientating or relocating the system.
5
Over the frequency range 150kHz to 80MHz, field strengths should be less than 3V/m.
When using the optional mobile stand, the System can be susceptible to
ESD and may require manual intervention. If ESD results in a System error,
unplug the probe, and plug it back in to restore operation.
TABLE 3. Separation distances
Recommended separation distances between portable and mobile RF
communications equipment and the EchoNous System
The System is intended for use in an electromagnetic environment in which
radiated RF disturbances are controlled. The customer or user of the System can
help prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF communications equipment (transmitters) and
the System 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
80 MHz to 800
MHz
d=1.2
800 MHz to 2,5
GHz
d=2.3
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 meters (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.
P P P
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