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 where Electrical Foot Massager and Nerve
Stimulator is used exceeds the applicable RF compliance level above, the Electrical Foot
Massager and Nerve Stimulator should be observed to verify normal operation. In case of any
abnormal performance, additional measures may be necessary, such as re-orienting or
relocating the Electrical Foot Massager and Nerve Stimulator
b. Field strengths should be less than 3 V/m in case of over the frequency range of 150 kHz to
80 MHz,.
The Electrical Foot Massager and Nerve Stimulator is intended for use in an electromagnetic
environment in which radiated RF disturbances are controlled. The customer or the user of the
Electrical Foot Massager and Nerve Stimulator can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment
(transmitters) and the Electrical Foot Massager and Nerve Stimulator as recommended below,
according to the maximum output power of the communications equipment.
Guidance and manufacturer’s declaration – electromagnetic immunity
Recommended distances between
portable and mobile RF communications equipment and the MODEL AST-300H
Rated maximum
output power of
transmitter (W)
Separation distance according to frequency of transmitter (m)
150 kHz to 80 MHz
80 MHz to 800 MHz
800 MHz to 2.5 GHz
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 meters (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.
NOTE1 At 80 MHz and 800 MHz, the separation distance for the higher frequency range
applies.
NOTE2 These guidelines may not apply in all situations. Electromagnetic propagation is
affected by absorption and reflection from structures, objects and people.
Page 36 of 37
d= 1,2 P
d= 1,2 P
d= 2,3 P
