Product Manual

NOTE 1 At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic
propagation is aected by absorption and is aected by absorption and
reection from structures, objects and people.
a
Field strengths from xed 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 address the electromagnetic environment due to xed
RF transmitters, an electromagnetic site survey should be considered. If
the measured eld strength in the location in which the Eko Electronic
Stethoscope System is used exceeds the applicable RF compliance level
above, the Eko Electronic Stethoscope System should be observed to
verify normal operation. If abnormal performance is observed, additional
measures may be necessary, such as re-orienting or relocating the Eko
Electronic Stethoscope System.
b
Over the frequency range 150 kHz to 80 MHz, eld strengths should be
less than 3 V/m.
Recommended Separation Distances Between Portable and Mobile RF
Communications Equipment and the Eko Electronic Stethoscope System
The Eko Electronic Stethoscope System is intended for use in the
electromagnetic environment in which radiated RF disturbances are
controlled. The user of the Eko Electronic Stethoscope System can help
prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF communications equipment (transmitters)
and the Eko Electronic Stethoscope 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 √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 0.37 0.37 0.74
1 1.2 1.2 2.3
10 3.7 3.7 7.4
100 12 12 23
For transmitters rated at a maximum output power not listed above, the
recommended separation distance d is meters (m) can be estimated using
the equation applicable to the frequency of the transmitter, where P is the
maximum 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 aected by absorption and reection from structures, objects
and people.
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