EMC GUIDANCE & MANUFACTURER’S DECLARATION
50
D-0115696-C (OM038)
– Otowave 302 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 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.
