EMC GUIDANCE & MANUFACTURER’S DECLARATION
35
D-0115690-C (OM001)
– Otowave 102 Operating Manual
Guidance and
manufacturer’s declaration – electromagnetic immunity (2)
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 Otowave 102 Tympanometer is used exceeds the applicable RF
compliance level above, the Otowave 102 Tympanometer should be observed to verify normal
operation. If abnormal performance is observed, additional measures may be necessary, such as
re-orienting or relocating the Otowave 102 Tympanometer.
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 Otowave 102 Tympanometer
The Otowave 102 Tympanometer is intended for use in an electromagnetic environment in which radiated
RF disturbances are controlled. The customer or the user of the Otowave 102 Tympanometer can help
prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF
communications equipment (transmitters) and the Otowave 102 Tympanometer 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
0.38
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 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 80MHz and 800MHz, 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.
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