EMC GUIDANCE & MANUFACTURER’S DECLARATION
56
OTOWAVE 302+ INSTRUCTION FOR USE
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 302+ Tympanometer is used exceeds the applicable RF compliance level above, the Otowave 302+
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 302+ 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 302+ Tympanometer
The Otowave 302+ Tympanometer is intended for use in an electromagnetic environment in which radiated RF
disturbances are controlled. The customer or the user of the Otowave 302+ Tympanometer can help prevent
electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications
equipment (transmitters) and the Otowave 302+ 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.
Содержание Otowave 302+
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