Guidance and Manufacturer’s Declaration – Electromagnetic Immunity
The Echo Devices are intended for use in the electromagnetic environment specified below. The
customer or the user of the Echo Devices should assure that they are used in such an environment.
Immunity test IEC 60601
test level
Compliance
level
Electromagnetic environment
–
guidance
Conducted RF
IEC 61000-4-6
Radiated RF
IEC 61000-4-3
3 Vrms
150 kHz to
80 MHz
3 V/m
80 MHz to
2.5 GHz
3 Vrms
150 kHz to
80 MHz
3 V/m
80 MHz to
2.5 GHz
Portable and mobile RF communications equipment
should be used no closer to any part of the Echo
Devices, including cables, than the recommended
separation distance calculated from the equation
applicable to the frequency of the transmitter.
Recommended separation distance
d=1.2√P
d=1.2√P 80 MHz to 800 MHz
d=2.3√P 800 MHz to 2.3 GHz
where
P
is the maximum output power rating of the
transmitter in watts (W) according to the transmitter
manufacturer and
d
is the recommended separation
distance in meters (m).
Field strengths from fixed RF transmitters, as
determined by an electromagnetic site survey,
a
should
be less than the compliance level in each frequency
range.
b
Interference may occur in the vicinity of equipment
marked with the following symbol:
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 affected by
absorption and reflection from structures, objects, and people.
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 Echo Devices are used exceeds the applicable RF compliance level above, the
Echo Devices should be observed to verify normal operation. If abnormal performance is observed,
additional measures may be necessary, such as re-orienting or relocating the Echo Devices.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than [
V
1] V/m.
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